Steering Lock Motor Drive Power Circuit: Procedure

1. Check the problem symptom of the steering lock system.

   Result

   Condition	Proceed to
   Steering lock cannot be released	A
   Steering cannot be locked	B

B → See step   6 

A: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Read the Data List. Enter the following menus: Body / Smart Access / Data List.
   SMART ACCESS
   
   

   Tester Display	Measurement Item/Range	Normal Condition
   Lock/Unlock Receive	Steering lock command reception record/YES or NO	YES: Steering lock/unlock signal received NO: Steering lock/unlock signal not received

5. Check if steering unlock command reception is confirmed.

   OK

   "YES" is displayed on the Techstream display.

NG → CHECK SMART ACCESS SYSTEM WITH PUSH-BUTTON START 

OK: Go to next step 

1. Measure the voltage according to the value(s) in the table below.
   Fig 1: Inspect Steering Lock Actuator Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Voltage

   Tester connection (Symbols)	Condition	Specified condition
   K28-3 (IGE) - K28-1 (GND)	Engine switch off Turn the engine switch on (ACC or IG)	Motor active: Below 1 V Motor not active: 10 to 12 V

OK → PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE 

NG: Go to next step 

1. Disconnect the K28 connector from the steering lock actuator assembly.
   Fig 2: Identifying K28 Connector From The Steering Lock Actuator Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Resistance

   Tester connection (Symbols)	Condition	Specified condition
   K28-1 (GND) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the K73 connector from the power source control ECU assembly.
   Fig 3: Checking Harness And Connector (Steering Lock Actuator Assembly Power Source Control ECU)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Resistance

   Tester connection (Symbols)	Condition	Specified condition
   K28-3 (IGE) - K73-32 (SLR+)	Always	Below 1 Ω
   K28-3 (IGE) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE POWER SOURCE CONTROL ECU ASSEMBLY 

1. Measure the voltage according to the value(s) in the table below.
   Fig 4: Identifying Steering Lock Actuator Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Voltage

   Tester connection (Symbols)	Condition	Specified condition
   K28-3 (IGE) - K28-1 (GND)	Adjust the shift lever to the P position Turn the engine switch off Open the driver's door	Motor active: Below 1 V Motor not active: 10 to 12 V

OK → PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE 

NG: Go to next step 

1. Disconnect the K28 connector from the steering lock actuator assembly.
   Fig 5: Identifying K73 And K28 Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the K73 connector from the power source control ECU assembly.
3. Measure the resistance according to the value(s) in the table below.

   Resistance

   Tester connection (Symbols)	Condition	Specified condition
   K28-3 (IGE) - K73-32 (SLR+)	Always	Below 1 Ω
   K28-3 (IGE) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE POWER SOURCE CONTROL ECU ASSEMBLY