Rear Window Defogger System Does Not Operate

WINDSHIELD / WINDOWGLASS: WINDOW DEFOGGER SYSTEM: Rear Window Defogger System does not Operate
- Rear Window Defogger System does not Operate

DESCRIPTION

w/ Multi-display:

When the rear window defogger switch, which is built into the multi-media module display assembly, is operated, the operation signals are transmitted to the A/C amplifier assembly through AVC-LAN and BEAN. When the A/C amplifier assembly receives the signals, it turns on the DEFOG relay to operate the rear window defogger.

w/o Multi-display:

When the rear window defogger switch, which is built into the integration control & panel, is operated, the operation signals are transmitted to the A/C amplifier assembly through AVC-LAN and BEAN. When the A/C amplifier assembly receives the signals, it turns on the DEFOG relay to operate the rear window defogger.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK COMMUNICATION SYSTEM

(a) Select the DTC check on the Techstream to check for communication errors.

Result:





B -- GO TO MULTIPLEX COMMUNICATION SYSTEM

C -- GO TO CAN COMMUNICATION SYSTEM
A -- Continue to next step.

2. PERFORM ACTIVE TEST USING TECHSTREAM

(a) Select the Active Test, use the Techstream to issue a control command, and then check the window defogger operation.

Air Conditioner:





Result:





B -- REPLACE INTEGRATION CONTROL & PANEL

C -- PERFORM ACTIVE TEST USING TECHSTREAM
A -- Continue to next step.

3. REPLACE MULTI-MEDIA MODULE DISPLAY

(a) Replace the multi-media module display.

NEXT -- Continue to next step.

4. CONFIRM REAR WINDOW DEFOGGER OPERATION

(a) Turn the engine switch on (IG), press the defogger switch, and check that window defogger operates.

NG -- REPLACE A/C AMPLIFIER ASSEMBLY

OK -- END

5. REPLACE INTEGRATION CONTROL & PANEL

(a) Replace the integration control & panel.

NEXT -- Continue to next step.

6. CONFIRM REAR WINDOW DEFOGGER OPERATION

(a) Turn the engine switch on (IG), press the defogger switch, and check that window defogger operates.

OK -- END
NG -- Continue to next step.

7. REPLACE RADIO RECEIVER ASSEMBLY

(a) Replace the radio receiver assembly.

NEXT -- Continue to next step.

8. REAR WINDOW DEFOGGER OPERATION

(a) Turn the engine switch on (IG), press the defogger switch, and check that window defogger operates.

NG -- REPLACE A/C AMPLIFIER ASSEMBLY

OK -- END

9. PERFORM ACTIVE TEST USING TECHSTREAM

(a) Select the Active Test, use the Techstream to issue a control command, and then check the DEFOG relay operation.

(b) Check that operation sound of the DEFOG relay is heard.

Result:





OK -- INSPECT DEFOGGER RELAY
NG -- Continue to next step.

10. INSPECT DEFOG RELAY

Defogger Relay

NG -- REPLACE DEFOG RELAY
OK -- Continue to next step.

11. CHECK WIRE HARNESS (DEFOG RELAY - BATTERY POSITIVE)

(a) Disconnect the DEFOG relay.





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

Voltage:

Engine room No. 1 R/B, J/B






NG -- REPAIR OR REPLACE LH-IG FUSE OR HARNESS AND CONNECTOR
OK -- Continue to next step.

12. CHECK WIRE HARNESS (DEFOG RELAY - A/C AMPLIFIER ASSEMBLY)

(a) Disconnect the DEFOG relay and A/C amplifier assembly connector.





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

Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE A/C AMPLIFIER ASSEMBLY

13. INSPECT DEFOGGER RELAY

Defogger Relay

NG -- REPLACE DEFOG RELAY
OK -- Continue to next step.

14. CHECK WIRE HARNESS (DEFOG RELAY - BATTERY POSITIVE AND BODY GROUND)

(a) Disconnect the DEFOG relay.





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

Resistance:

Engine room No. 1 R/B, J/B






Voltage:

Engine room No. 1 R/B, J/B






NG -- REPAIR OR REPLACE DEFOG FUSE OR HARNESS AND CONNECTOR
OK -- Continue to next step.

15. INSPECT NOISE FILTER

(a) Disconnect the noise filter connectors.





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

Resistance:





NG -- REPLACE NOISE FILTER
OK -- Continue to next step.

16. CHECK WIRE HARNESS (DEFOG RELAY - NOISE FILTER)

(a) Disconnect the DEFOG relay and defogger wire connectors.





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

Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

17. CHECK WIRE HARNESS (DEFOGGER WIRE CONNECTOR - BODY GROUND)

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





Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPAIR OR REPLACE REAR WINDOW DEFOGGER WIRE