Repair Instruction: Precaution: Precaution

BASIC REPAIR HINT

HINTS ON OPERATIONS

Fig 1: Identifying Precautions

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1	Attire	Always wear a clean uniform. Hat and safety shoes must be worn.
2	Vehicle protection	Prepare a grille cover, fender cover, seat cover and floor mat before starting the operation.
3	Safe operation	When working with 2 or more persons, be sure to check safety for one another. When working with the engine running, make sure to provide ventilation for exhaust fumes in the workshop. If working on high temperature, high pressure, rotating, moving, or vibrating parts, wear appropriate safety equipment and take extra care not to injure yourself or others. When jacking up the vehicle, be sure to support the specified location with a safety stand. When lifting up the vehicle, use appropriate safety equipment.
4	Preparation of tools and measuring gauge	Before starting operation, prepare a tool stand, SST, gauge, oil and parts for replacement.
5	Removal and installation, disassembly and assembly operations	Diagnose with a thorough understanding of proper procedures and of the reported problem. Before removing the parts, check the general condition of the assembly and for deformation and damage. When the assembly is complicated, take notes. For example, note the total number of electrical connections, bolts, or hoses removed. Add matchmarks to insure reassembly of components in the original positions. Temporarily mark hoses and their fittings if needed. Clean and wash the removed parts if necessary and assemble them after a thorough check.
6	Removed parts	Place the removed parts in a separate box to avoid mixing them up with the new parts or contaminating the new parts. For non-reusable parts such as gaskets, O-rings, and self-locking nuts, replace them with new ones as instructed in this information. Retain the removed parts for customer inspection, if requested.

JACKING UP AND SUPPORTING VEHICLE
1. Care must be taken when jacking up and supporting the vehicle. Be sure to lift and support the vehicle at the proper locations.
PRECOATED PARTS

Fig 2: Identifying Seal Lock Adhesive
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Precoated parts are bolts and nuts that are coated with a seal lock adhesive at the factory.
2. If a precoated part is retightened, loosened or moved in any way, it must be recoated with the specified adhesive.
3. When reusing a precoated part, clean off the old adhesive and dry the part with compressed air. Then apply new seal lock adhesive appropriate to that part.
4. Some seal lock agents harden slowly. You may have to wait for the seal lock adhesive to harden.
GASKETS
1. When necessary, use a sealer on gaskets to prevent leaks.
BOLTS, NUTS AND SCREWS
1. Carefully follow all the specifications for tightening torques. Always use a torque wrench.

FUSES

Fig 3: Identifying Fuses Condition

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

When inspecting a fuse, check that the wire of the fuse is not broken.
If the wire of a fuse is broken, confirm that there are no shorts in its circuit.

When a fuse is replaced, a fuse with the same amperage rating must be used.

Illustration	Symbol	Part Name	Abbreviation
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	FUSE	FUSE
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	MEDIUM CURRENT FUSE	M-FUSE
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	HIGH CURRENT FUSE	H-FUSE
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	FUSIBLE LINK	FL
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	CIRCUIT BREAKER	CB

CLIPS

The removal and installation methods of typical clips used for vehicle body parts are shown in the table below.

HINT:

If clips are damaged during a procedure, always replace the damaged clip with a new clip.

Shape (Example)	Illustration	Procedures
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	Remove clips with clip remover or pliers.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	Remove the clips with clip remover or screwdriver.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	Remove clips with wide scraper to prevent panel damage.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	Remove clips by pushing center pin through and prying out the shell.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	Remove clips by unscrewing the center pin and prying out the shell.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	Remove clips by prying out the pin and then prying out the shell.

CLAWS

The removal and installation methods of typical claws used for vehicle body parts are shown in the table below.

HINT:

If claws are damaged during a procedure, always replace the damaged claws with new caps or covers.

Shape (Example)	Illustration	Procedures
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	Using a screwdriver, detach the claws and remove the cap or covers.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	Using a screwdriver, detach the claws and remove the cap or covers.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	Using a screwdriver, detach the claws and remove the cap or covers.

REMOVAL AND INSTALLATION OF VACUUM HOSES
1. To disconnect a vacuum hose, pull and twist from the end of the hose. Do not pull from the middle of the hose as this may cause damage.
  
  Fig 4: Identifying Vacuum Hose Handling Procedure
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. When disconnecting vacuum hoses, use tags to identify where they should be reconnected.
  
  Fig 5: Identifying Tag On Vacuum Hoses
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. After completing any hose related repairs, double check that the vacuum hoses are properly connected. The label under the hood shows the proper layout.
4. When using a vacuum gauge, never force the hose onto a connector that is too large. If a hose has been stretched, it may leak air. Use a step-down adapter if necessary.

TORQUE WHEN USING TORQUE WRENCH WITH EXTENSION TOOL

Fig 6: Identifying Torque Wrench Dimension

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Use the formula below to calculate special torque values for situations where SST or an extension tool is combined with the torque wrench.

Fig 7: Identifying SST Dimension

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Formula

T' = L2 / (L1 + L2) * T

T'	Reading of torque wrench {Nm (kgfcm, ft.*lbf)}
T	Torque {Nm (kgfcm, ft.*lbf)}
L1	Length of SST or extension tool {cm (in.)}
L2	Length of torque wrench {cm (in.)}

NOTE:

If an extension tool or SST is combined with a torque wrench and the wrench is used to tighten to a torque specification in this information, the actual torque will be excessive and parts will be damaged.

FOR VEHICLES EQUIPPED WITH SRS AIRBAG AND SEAT BELT PRETENSIONER
The LEXUS GS460/350 is equipped with a Supplemental Restraint System (SRS).
WARNING:
- Before performing pre-disposal deployment of any SRS component, review and closely follow all applicable environmental and hazardous material regulations. Pre-disposal deployment may be considered hazardous material treatment.
- Failure to carry out the service operations in the correct sequence could cause the SRS to unexpectedly deploy during servicing and lead to serious injury. Furthermore, if a mistake is made when servicing the SRS, it is possible that the SRS may fail to operate properly. Before servicing (including removal, installation, inspection or replacement of parts), be sure to read the following carefully.
1. GENERAL NOTICE
  1. As malfunctions of the SRS are difficult to confirm, the Diagnostic Trouble Codes (DTCs) become the most important source of information when troubleshooting. When troubleshooting the SRS, always check the DTCs before disconnecting the battery.
  2. Work must be started at least 90 seconds after the engine switch is turned OFF and after the cable is disconnected from the negative (-) battery terminal.
    The SRS is equipped with a backup power source. If work is started within 90 seconds after turning the engine switch OFF and disconnecting the cable from the negative (-) battery terminal, the SRS may deploy.
    
    When the cable is disconnected from the negative (-) battery terminal, clock and audio system memory is erased. Before starting work, make a note of the settings of each memory system. When work is finished, reset the clock and audio system as before.
    
    WARNING:
    Never use a backup power source (battery or other) to avoid erasing system memory. The backup power source may inadvertently power the SRS and cause it to deploy.
  3. In minor collisions where the SRS does not deploy, the steering pad. Refer to DISPOSAL , front passenger airbag assembly. Refer to DISPOSAL , driver seat side knee airbag assembly. Refer to DISPOSAL , front passenger seat side knee airbag assembly. Refer to DISPOSAL , curtain shield airbag assembly. Refer to DISPOSAL , front seat airbag assembly. Refer to DISPOSAL , rear seat airbag assembly. Refer to DISPOSAL , front seat outer belt assembly with pretensioner. Refer to DISPOSAL and rear seat outer belt assembly with pretensioner. Refer to DISPOSAL should be inspected before further use of the vehicle.
  4. Never use SRS parts from another vehicle. When replacing parts, use new parts.
  5. Before repairs, remove the airbag sensor assemblies if impacts are likely to be applied to the sensors during repairs.
  6. Never disassemble or attempt to repair the steering pad, front passenger airbag assembly, driver seat side knee airbag assembly, front passenger seat side knee airbag assembly, curtain shield airbag assembly, front seat airbag assembly, rear seat airbag assembly, front seat outer belt assembly with pretensioner and rear seat outer belt assembly with pretensioner.
  7. Replace the steering pad, front passenger airbag assembly, driver seat side knee airbag assembly, front passenger seat side knee airbag assembly, curtain shield airbag assembly, front seat airbag assembly, rear seat airbag assembly, front seat outer belt assembly with pretensioner and rear seat outer belt assembly with pretensioner if: 1) damage has occurred from being dropped, or 2) cracks, dents or other defects in the case, bracket or connector are present.
  8. Do not directly expose the airbag sensor assemblies or airbag assemblies to hot air or flames.
  9. Use an ohmmeter / voltmeter with high impedance (10 kΩ/V minimum) for troubleshooting electrical circuits.
  10. Information labels are attached to the SRS components. Follow the instructions on the labels.
  11. After work on the SRS is completed, check the SRS warning light.
2. SPIRAL CABLE
  
  Fig 8: Identifying Spiral Cable Mark Location
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. The steering wheel must be fitted correctly to the steering column with the spiral cable at the neutral position, as cable disconnection and other problems may occur. Refer to the information about correct installation of the steering wheel. Refer to INSTALLATION .
3. STEERING PAD
  1. Always place a removed or new steering pad with its pad surface facing upward as shown in the illustration. Placing the steering pad with the pad surface facing down could cause a serious accident if the airbag inflates. Also, do not place anything on top of the horn button.
    
    Fig 9: Identifying Steering Pad Handling Procedure
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Never measure the resistance of the airbag squib. This may cause the airbag to inflate, which could cause serious injury.
    
    Fig 10: Identifying Precaution For Measuring Resistance Of Airbag Squib
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Grease or detergents of any kind should not be applied to the horn button.
  4. Store the steering pad assembly in an area where the ambient temperature is below 93°C (200°F), the humidity is not high and there is no electrical noise.
  5. When using electric welding anywhere on the vehicle, disconnect the airbag ECU connectors (4 pins). These connectors contain shorting springs. This feature reduces the possibility of the airbag deploying due to currents entering the squib wiring.
  6. When disposing of the vehicle or the steering pad assembly by itself, the airbag should be deployed using SST before disposal. Activate the airbag in a safe place away from electrical noise.
4. FRONT PASSENGER AIRBAG ASSEMBLY
  1. Always place a removed or new front passenger airbag assembly with the pad surface facing upward as shown in the illustration. Placing the airbag assembly with the airbag inflation direction facing down could cause a serious accident if the airbag inflates.
    
    Fig 11: Identifying Front Passenger Airbag Assembly Handling Procedure
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Never measure the resistance of the airbag squib. This may cause the airbag to inflate, which could cause serious injury.
    
    Fig 12: Identifying Precaution For Measuring Resistance Of Airbag Squib
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Grease or detergents of any kind should not be applied to the front passenger airbag assembly.
  4. Store the airbag assembly in an area where the ambient temperature is below 93°C (200°F), the humidity is not high and there is no electrical noise.
  5. When using electric welding anywhere on the vehicle, disconnect the airbag ECU connectors (4 pins). These connectors contain shorting springs. This feature reduces the possibility of the airbag deploying due to currents entering the squib wiring.
  6. When disposing of the vehicle or the airbag assembly unit by itself, the airbag should be deployed using SST before disposal. Activate it in a safe place away from electrical noise.
5. CURTAIN SHIELD AIRBAG ASSEMBLY
  1. Always place a removed or new curtain shield airbag assembly in a clear plastic bag, and keep it in a safe place.
    
    Fig 13: Identifying Curtain Shield Airbag Assembly Handling Procedure
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    WARNING:
    The plastic bag is not reusable.
    
    NOTE:
    Never disassemble the curtain shield airbag assembly.
  2. Never measure the resistance of the airbag squib. This may cause the airbag to inflate, which could cause serious injury.
    
    Fig 14: Identifying Precaution For Measuring Resistance Of Airbag Squib
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Grease or detergents of any kind should not be applied to the curtain shield airbag assembly.
  4. Store the airbag assembly in an area where the ambient temperature is below 93°C (200°F), the humidity is not high and there is no electrical noise.
  5. When using electric welding anywhere on the vehicle, disconnect the airbag ECU connectors (4 pins). These connectors contain shorting springs. This feature reduces the possibility of the airbag deploying due to currents entering the squib wiring.
  6. When disposing of a vehicle or the airbag assembly unit by itself, the airbag should be deployed using SST before disposal. Activate it in a safe place away from electrical noise.
6. FRONT SEAT AIRBAG ASSEMBLY
  1. Always place a removed or new front seat airbag assembly with the airbag inflation direction facing up.
    
    Fig 15: Identifying Front Seat Airbag Assembly Handling Procedure
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Never measure the resistance of the airbag squib. This may cause the airbag to inflate, which could cause serious injury.
    
    Fig 16: Precaution For Measuring Resistance Of Airbag Squib
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Grease or detergents of any kind should not be applied to the front seat airbag assembly.
  4. Store the airbag assembly in an area where the ambient temperature is below 93°C (200°F), the humidity is not high and there is no electrical noise.
  5. When using electric welding anywhere on the vehicle, disconnect the airbag ECU connectors (2 pins). These connectors contain shorting springs. This feature reduces the possibility of the airbag deploying due to currents entering the squib wiring.
  6. When disposing of a vehicle or the airbag assembly unit by itself, the airbag should be deployed using SST before disposal. Activate it in a safe place away from electrical noise.
7. REAR SEAT AIRBAG ASSEMBLY
  1. Always place removed or new rear seat airbag assembly with the airbag inflation direction facing up.
  2. Never measure the resistance of the airbag squib. This may cause the airbag to inflate, which could cause serious injury.
  3. Grease or detergents of any kind should not be applied to the rear seat airbag assembly.
  4. Store the airbag assembly in an area where the ambient temperature is below 93°C (200°F), the humidity is not high and there is no electrical noise.
  5. When using electric welding anywhere on the vehicle, disconnect the airbag ECU connectors (2 pins). These connectors contain shorting springs. This feature reduces the possibility of the airbag deploying due to currents entering the squib wiring.
  6. When disposing of a vehicle or the airbag assembly unit by itself, the airbag should be deployed using SST before disposal. Activate in a safe place away from electrical noise.
8. DRIVER SEAT SIDE KNEE AIRBAG ASSEMBLY AND FRONT PASSENGER SEAT SIDE KNEE AIRBAG ASSEMBLY
  1. Always place a removed or new knee airbag assembly with the airbag inflation direction facing upward. Placing the airbag assembly with the airbag inflation direction facing downward could cause a serious accident if the airbag inflates.
    
    Fig 17: Identifying Driver Seat Side Knee Airbag Assembly And Front Passenger Seat Side Knee Airbag Assembly Handling Procedure
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Never measure the resistance of the airbag squib. This may cause the airbag to inflate, which could cause serious injury.
    
    Fig 18: Identifying Precaution For Measuring Resistance Of Airbag Squib
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Grease or detergents of any kind should not be applied to the knee airbag assembly.
  4. Store the knee airbag assembly where the ambient temperature is below 93°C (200°F), the humidity is not high and there is no electrical noise.
  5. When using electric welding anywhere on the vehicle, disconnect the airbag ECU connectors (2 pins). These connectors contain shorting springs. This feature reduces the possibility of the airbag deploying due to currents entering the squib wiring.
  6. When disposing of a vehicle or knee airbag assembly unit by itself, the airbag should be inflated using SST before disposal. Activate in a safe place away from electrical noise.
9. FRONT SEAT OUTER BELT ASSEMBLY AND REAR SEAT OUTER BELT ASSEMBLY (SEAT BELT PRETENSIONER)
  1. Never measure the resistance of the seat outer belt. This may cause the pretensioner of the seat belt to activate, which could cause serious injury.
    
    Fig 19: Precaution For Measuring Resistance Of Seat Outer Belt
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Never disassemble the seat outer belt.
  3. Never install the seat outer belt on another vehicle.
  4. Store the seat outer belt in an area where the ambient temperature is below 80°C (176°F), the humidity is not high and there is no electrical noise.
  5. When using electric welding anywhere on the vehicle, disconnect the airbag ECU connectors (2 pins). These connectors contain shorting springs. This feature reduces the possibility of the pretensioner deploying due to currents entering the squib wiring.
  6. When disposing of a vehicle or the seat outer belt assembly by itself, the seat outer belt should be activated before disposal. Activate it in a safe place away from electrical noise.
  7. As the seat outer belt is hot after the pretensioner is activated, allow some time for it to cool down sufficiently before disposal. Never apply water to try to cool down the seat outer belt.
  8. Grease, detergents, oil or water should not be applied to the seat outer belt.
10. AIRBAG SENSOR ASSEMBLY
  1. Never reuse an airbag sensor assembly that has been involved in a collision where the SRS has deployed.
  2. The connectors to the airbag sensor assembly should be connected or disconnected with the sensor placed on the floor. If the connectors are connected or disconnected while the airbag sensor assembly is not placed on the floor, the SRS may activate.
  3. Work must be started at least 90 seconds after the engine switch is turned OFF and the cable is disconnected from the negative (-) battery terminal, even if only loosening the set bolts of the airbag sensor assembly.
11. WIRE HARNESS AND CONNECTOR
  1. The SRS wire harness is integrated with the instrument panel wire harness assembly. All the connectors in the system are a standard yellow color. If the SRS wire harness becomes disconnected or the connector becomes broken, repair or replace it.
ELECTRONIC CONTROL

Fig 20: Disconnecting Battery Negative Cable
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. REMOVAL AND INSTALLATION OF BATTERY TERMINAL
  NOTE:
  Certain systems need to be initialized after disconnecting and reconnecting the cable from the negative (-) battery terminal.
  1. Before performing electronic work, disconnect the cable from the negative (-) battery terminal to prevent component and wire damage caused by accidental short circuits.
  2. When disconnecting the cable, turn the engine switch OFF and headlight dimmer switch OFF and loosen the cable nut completely. Perform these operations without twisting or prying the cable. Then disconnect the cable.
  3. Clock settings, radio settings, audio system memory, DTCs and other data are erased when the cable is disconnected from the negative (-) battery terminal. Write down any necessary data before disconnecting the cable.
2. HANDLING OF ELECTRONIC PARTS
  
  Fig 21: Precaution For Handling Of Electronic Parts
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. Do not open the cover or case of the ECU unless absolutely necessary. If the IC terminals are touched, the IC may be rendered inoperative by static electricity.
  2. Do not pull the wires when disconnecting electronic connectors. Pull the connector itself.
  3. Be careful not to drop electronic components, such as sensors or relays. If they are dropped on a hard surface, they should be replaced.
  4. When cleaning the engine with steam, protect the electronic components, air filter and emission-related components from water.
  5. Never use an impact wrench to remove or install temperature switches or temperature sensors.
  6. When measuring the resistance of a wire connector, insert the tester probe carefully to prevent terminals from bending.
REMOVAL AND INSTALLATION OF FUEL CONTROL PARTS
1. PLACE FOR REMOVING AND INSTALLING FUEL SYSTEM PARTS
  1. Work in a location with good air ventilation that does not have welders, grinders, drills, electric motors, stoves, or any other engine sources.
  2. Never work in a pit or near a pit as vaporized fuel will collect in those places.
2. REMOVING AND INSTALLING FUEL SYSTEM PARTS
  1. Prepare a fire extinguisher before starting the operation.
  2. To prevent static electricity, install a ground wire to the fuel changer, vehicle and fuel tank, and do not spray the surrounding area with water. Be careful when performing work in this area, as the work surface will become slippery. Do not clean up gasoline spills with water, as this may cause the gasoline to spread, and possibly create a fire hazard.
  3. Avoid using electric motors, working lights and other electric equipment that can cause sparks or high temperatures.
  4. Avoid using iron hammers as they may create sparks.
  5. Dispose of fuel-contaminated cloth separately using a fire resistant container.
REMOVAL AND INSTALLATION OF ENGINE INTAKE PARTS

Fig 22: Identifying Engine Intake Parts
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. If any metal particles enter inlet system parts, this may damage the engine.
2. When removing and installing inlet system parts, cover the openings of the removed parts and engine openings. Use gummed tape or other suitable materials.
3. When installing inlet system parts, check that no metal particles have entered the engine or the installed parts.
HANDLING OF HOSE CLAMPS

Fig 23: Identifying Hose Clamps
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Before removing the hose, check the clamp position so that it can be reinstalled in the same position.
2. Replace any deformed or dented clamps with new ones.
3. When reusing a hose, attach the clamp on the clamp track portion of the hose.
4. For a spring type clamp, you may want to spread the tabs slightly after installation by pushing in the direction of the arrows as shown in the illustration.
FOR VEHICLES EQUIPPED WITH MOBILE COMMUNICATION SYSTEMS
1. Install the antenna as far away from the ECU and sensors of the vehicle electronic systems as possible.
  
  Fig 24: Identifying Antenna Feeder Away From ECU And Sensors
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Install an antenna feeder at least 20 cm (7.87 in.) away from the ECU and sensors of the vehicle electronic systems. For details about ECU and sensor locations, refer to the information of the applicable components.
3. Keep the antenna and feeder separate from other wirings as much as possible. This will prevent signals from the communication equipment from affecting vehicle equipment and vice versa.
4. Check that the antenna and feeder are correctly adjusted.
5. Do not install any high-powered mobile communication system.
HEADLIGHT INSPECTION MAINTENANCE
1. When the headlight dimmer switch assembly is set to HEAD, do not touch the discharge headlight's high-voltage socket area.
  NOTE:
  When performing inspection maintenance, the discharge headlight's precautions must be followed.
2. When the headlights are illuminated, do not cover the headlights for 3 minutes or more.
  
  Fig 25: Caution - Do Not Cover Headlights For 3 Minutes Or More
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  NOTE:
  As the headlight's outer lens is made of resin, the resulting heat created when covering the headlight for an extended period of time may deform the headlight.
FOR VEHICLES EQUIPPED WITH TRAC (TRACTION CONTROL) SYSTEM AND VSC (VEHICLE STABILITY CONTROL) SYSTEM
1. NOTICES FOR WHEN TESTING WITH 2-WHEEL DRUM TESTER
  1. When testing with a 2-wheel drum tester such as a speedometer tester, a combination tester for the speedometer and brake, a chassis dynamometer, enter maintenance mode, or switch to VSC OFF mode to turn TRAC and VSC operation off. Then enter test mode, start the engine and perform measurements.
    WARNING:
    If the vehicle is tested in normal mode on the drum tester, TRAC and VSC operation may cause the vehicle to jump out from the drum tester.
    
    When switching to VSC OFF mode, the VSC OFF switch must be held for 3 seconds or more with the vehicle stopped. TRAC and VSC operation must both be turned off before beginning testing.
    
    During VSC off mode, the VSC OFF indicator light will come on and the TRAC OFF message will be displayed on the multi information display.
    
    Fix the vehicle in place with chains for safety.
2. NOTICES FOR VSC RELATED PROCEDURES
  1. For VSC related parts, adjustments are required after removal and installation. Therefore, perform removal and installation only when necessary.
  2. When performing VSC related procedures, be sure to strictly follow the preparation and completion procedures.
  3. When performing removal and installation or replacement of VSC related parts, first disconnect the cable from the negative (-) battery terminal.
WHEN SERVICING FULL-TIME AWD VEHICLES
1. The full-time AWD LEXUS GS350 is equipped with the All-Wheel-Drive control system.
  If incorrect preparations or test procedures are used, the test will not only be unsuccessful, but may be dangerous as well.
  
  Therefore, before beginning any such servicing or test, be sure to check the following items:
  1. Whether the tires are touching the ground or jacked up
  2. Transmission gear position
  3. Maximum testing vehicle speed
  4. Maximum testing time
    WARNING:
    Never accelerate or decelerate the vehicle suddenly
    
    Observe the other cautions given for each individual test.
2. When using a braking force tester (not free roller type):
  When performing measurements using a low-speed type brake tester, observe the following instructions.
  1. To disable the AWD system, short terminals OPA and CG of the DLC3.
  2. If the vehicle is equipped with the Vehicle Stability Control (VSC) & Traction Control (TRAC) system, prohibit the system from activating.
  3. Position the rear wheels to be tested on the tester.
  4. Position the front wheels between wheel chocks, or jack up the front wheels.
  5. Shift the transmission shift lever to the "N" position.
  6. Idle the engine, operate the brake booster and perform the test.
3. When using a braking force tester (free roller type):
  When performing measurements using a low-speed type brake tester, observe the following instructions.
  
  Fig 28: Positioning Front Wheels On Free Roller
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. Enter inspection mode to disable TRAC and VSC control.
  2. Position the rear wheels on the tester roller.
  3. Position the front wheels on the free roller.
    WARNING:
    The maximum speed should be less than 60 km/h (37 mph) and maximum driving time should be 1 minute.
    
    HINT:
    - Sudden shifting, braking, acceleration or deceleration is not allowed.
    - Make sure to activate the Vehicle Stability Control (VSC) & Traction Control (TRAC) system to operational condition after the test. Check that the slip indicator light goes off when restarting the engine.
4. When using a speedometer (not free roller type):
  Observe the following instructions and then measure with the rear wheels.
  1. To disable the AWD system, short terminals OPA and CG of the DLC3.
  2. Enter inspection mode to disable TRAC and VSC control.
  3. Position the rear wheels on the tester.
  4. Position the front wheels between wheel chocks, or jack up the front wheels.
  5. Ensure that the vehicle does not move using wires.
  6. Shift the transmission shift lever to the "N" position.
  7. Idle the engine, operate the brake booster and perform the test.
5. When using a speedometer (free roller type):
  Observe the following instructions and then measure with the rear wheels.
  1. Position the rear wheels on the tester roller.
  2. Position the front wheels on the free roller.
  3. Enter inspection mode to disable TRAC and VSC control.
  4. Ensure that the vehicle does not move using wires.
    WARNING:
    The maximum speed should be less than 60 km/h (37 mph) and maximum driving time should be 1 minute.
    
    HINT:
    - Sudden shifting, braking, acceleration or deceleration is not allowed.
    - Make sure to activate the Vehicle Stability Control (VSC) & Traction Control (TRAC) system after the test. Check that the slip indicator light goes off when restarting the engine.
6. Using chassis dynamometer
  
  Fig 32: Measuring Rear Wheels
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Observe the following instructions and then measure with the rear wheels.
  1. Enter inspection mode to disable TRAC and VSC control.
  2. Ensure that the vehicle is securely fixed.
    HINT:
    - Sudden shifting, braking, acceleration or deceleration is not allowed.
    - Make sure to activate the Vehicle Stability Control (VSC) & Traction Control (TRAC) system after the test. Check that the slip indicator light goes off when restarting the engine.
7. On-vehicle wheel balancing
  NOTE:
  Do not use on-vehicle wheel balancing.

WHEN TOWING FULL-TIME AWD VEHICLES

Using one of the methods shown below to tow the vehicle.
If the vehicle has trouble in the chassis and drive train, use method 1 (flat bed truck).

Towing Method		Parking Brake Condition	Transmission Shift Lever Position
1. Flat Bed Truck Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002		Applied	Any Position
2. Wheel Lift Type Truck From Front Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002© TOYOTA, LICENSE AGREEMENT TMS1002 From Rear Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002© TOYOTA, LICENSE AGREEMENT TMS1002		Applied	Any Position

NOTE:

Do not use any towing method other than those shown above.

For example, the towing methods shown below are dangerous or damage the vehicle, so do not use them.

Never tow the vehicle using a method where the lifted-up wheel cannot rotate.
If this towing method is used, either from the front or rear:
1. There is a danger of the drive train heating up and causing breakdown, or of the wheels flying off the dolly.
2. In addition, if the vehicle is equipped with the Vehicle Stability Control (VSC) & Traction Control (TRAC) system, the system will apply the rotating wheels brake unless the engine isn't shut off.

Do not use the sling type method, either from the front or rear, as this method causes damage to the body.

FOR VEHICLES EQUIPPED WITH CATALYTIC CONVERTER
WARNING:
If a large amount of unburned gasoline or gasoline vapors flow into the converter, it may cause overheating and create a fire hazard. To prevent this, observe the following precautions.
1. Use only unleaded gasoline.
2. Avoid idling the engine for more than 20 minutes.
3. Avoid performing unnecessary spark jump tests.
  1. Perform a spark jump test only when absolutely necessary. Perform this test as rapidly as possible.
  2. While testing, never race the engine.
4. Avoid a prolonged engine compression measurement. Engine compression measurements must be performed as rapidly as possible.
5. Do not run the engine when the fuel tank is nearly empty. This may cause the engine to misfire and create an extra load on the converter.
INSPECTION AND ADJUSTMENT OF JOINT ANGLE DURING REMOVAL AND INSTALLATION OF PROPELLER SHAFT
1. When performing operations which involve the removal and installation of the propeller shaft, always check the joint angle. Make adjustments if necessary.
  
  Fig 33: Inspecting Joint Angle Of Propeller Shaft
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002