Inspection Procedure

CHECK FOR DTCs

Select the DTC check on the intelligent tester to check for communication errors.

Result

RESULT CHART

Result	Proceed to
No DTC is output	A
DTC are output (LIN communication)	B

B: GO TO MULTIPLEX COMMUNICATION SYSTEM

A: Go to Next Step

PERFORM ACTIVE TEST BY INTELLIGENT TESTER

Select the ACTIVE TEST, use the intelligent tester to issue a control command, and then check the window defogger operation.

Air Conditioner

ITEM CHART

Item	Test Details
Defogger Relay (Rear)	Turns rear window defogger OFF/ON

OK: Go to step 5

NG: Go to Next Step

REPLACE AIR CONDITIONER CONTROL ASSEMBLY
1. Replace the air conditioner control assembly.
CONFIRM REAR WINDOW DEFOGGER OPERATION
1. Turn the engine switch on (IG), press the defogger switch, and check that the window defogger operates.
NG: REPLACE A/C AMPLIFIER ASSEMBLY

OK: END

PERFORM ACTIVE TEST BY INTELLIGENT TESTER

Select the ACTIVE TEST, use the intelligent tester to issue a control command, and then check the DEFOG relay operation.

Check that operation sound of the RR DEF relay is heard.

RESULT CHART

Result	Proceed to
Relay operating sound is heard	OK
Relay operating sound is not heard	NG

OK: Go to step 9

NG: Go to Next Step

INSPECT RR DEF RELAY
See ON-VEHICLE INSPECTION .

NG: REPLACE RR DEF RELAY

OK: Go to Next Step

CHECK WIRE HARNESS (RR DEF RELAY - BATTERY POSITIVE)

Disconnect the RR DEF relay.

Measure the voltage according to the value(s) in the table below.

Standard voltage:

Engine room R/B, J/B

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
1 - Body ground	Engine switch on (IG)	10 to 14 V

Fig 1: Checking Wire Harness (RR DEF Relay - Battery Positive)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE A/C NO. 2 FUSE, HARNESS OR CONNECTOR

OK: Go to Next Step

CHECK WIRE HARNESS (RR DEF RELAY - A/C AMPLIFIER ASSEMBLY)

Disconnect the RR DEF relay and A/C amplifier assembly connector.

Measure the resistance according to the value(s) in the table below.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
2 - E1-38	Always	Below 1 Ω
2 - Body ground	Always	10 kΩ or higher

Fig 2: Checking Wire Harness (RR DEF Relay - A/C Amplifier Assembly)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE A/C AMPLIFIER ASSEMBLY

INSPECT RR DEF RELAY
See ON-VEHICLE INSPECTION .

NG: REPLACE RR DEF RELAY

OK: Go to Next Step

CHECK WIRE HARNESS (RR DEF RELAY - BATTERY POSITIVE AND BODY GROUND)

Disconnect the RR DEF relay.

Measure the voltage and resistance according to the value(s) in the table below.

Standard resistance:

Engine room R/B, J/B

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
4 - Body ground	Always	Below 1 Ω

Standard voltage:

Engine room R/B, J/B

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
5 - Body ground	Always	10 to 14 V

Fig 3: Checking Wire Harness (RR DEF Relay - Battery Positive And Body Ground)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE RR DEF FUSE, HARNESS OR CONNECTOR

OK: Go to Next Step

INSPECT NOISE FILTER

Disconnect the noise filter connector.

Measure the resistance according to the value(s) in the table below.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
L20-1 - L20-2	Always	Below 1 Ω
L20-1 - Body ground	Always	10 kΩ or higher

Fig 4: Identifying L20 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE NOISE FILTER

OK: Go to Next Step

CHECK WIRE HARNESS (RR DEF RELAY - NOISE FILTER)

Disconnect the RR DEF relay and defogger wire connectors.

Measure the resistance according to the value(s) in the table below.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
3 - L20-2	Always	Below 1 Ω
3 - Body ground	Always	10 kΩ or higher

Fig 5: Checking Wire Harness (RR DEF Relay - Noise Filter)

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

CHECK WIRE HARNESS (NOISE FILTER - DEFOGGER WIRE CONNECTOR)

Measure the resistance according to the value(s) in the table below.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
L20-1 - N1-1	Always	Below 1 Ω
L20-1 - Body ground	Always	10 kΩ or higher

Fig 6: Identifying L20 And N1 Connector Terminals

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

CHECK WIRE HARNESS (DEFOGGER WIRE CONNECTOR - BODY GROUND)

Measure the resistance according to the value(s) in the table below.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
N1-1 -Body ground	Always	Below 1 Ω

Fig 7: Identifying N1 Connector Terminals

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPAIR OR REPLACE REAR WINDOW DEFOGGER WIRE