Rear Window Defogger System Does Not Operate

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

DESCRIPTION

When the rear window defogger switch, which is built into the heater control (blower switch), is operated, the operation signals are transmitted to the DEF relay (coil side). When the DEF relay (coil side) receives the signals, it turns on the DEF relay (switch side) to operate the rear window defogger.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK REAR WINDOW DEFOGGER SYSTEM

(a) Turn the window defogger switch on.

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

OK:

Relay operating sound is heard.

NG -- INSPECT FUSES (ECU-IG NO. 2, HTR-IG)
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (REAR WINDOW DEFOGGER WIRE - INSTRUMENT PANEL J/B)

(a) Disconnect the P6 rear window defogger wire and 2F instrument panel junction block connectors.





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

Standard Resistance:





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

3. CHECK HARNESS AND CONNECTOR (REAR WINDOW DEFOGGER WIRE BATTERY POSITIVE)

(a) Reconnect the 2F instrument panel junction block connector.





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

Standard Voltage:





NG -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Problem Symptoms Table
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (REAR WINDOW DEFOGGER WIRE CONNECTOR - BODY GROUND)

(a) Disconnect the P7 rear window defogger wire connector.





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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPAIR OR REPLACE REAR WINDOW DEFOGGER WIRE

5. INSPECT FUSES (ECU-IG NO. 2, HTR-IG)

(a) Remove the ECU-IG NO. 2 and HTR-IG fuses from the instrument panel junction block.

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

Standard Resistance:





NG -- REPLACE FUSES (ECU-IG NO. 2, HTR-IG)
OK -- Continue to next step.

6. CHECK HARNESS AND CONNECTOR (IG1 RELAY POWER SOURCE)

(a) Disconnect the 2F instrument panel junction block connector.





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

Standard Voltage:





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

7. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - BATTERY)

(a) Reconnect the 2F instrument panel junction block connector.





(b) Disconnect the 2G instrument panel junction block connector.

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

Standard Voltage:





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

8. CHECK HARNESS AND CONNECTOR (REAR WINDOW DEFOGGER SWITCH - INSTRUMENT PANEL J/B)

(a) Disconnect the E58 heater control (blower switch) connector.





(b) Disconnect the 2Q instrument panel junction block connector.

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

Standard Resistance:





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

9. CHECK HARNESS AND CONNECTOR (HEATER CONTROL (BLOWER SWITCH) - BATTERY POSITIVE)

(a) Reconnect the 2G and 2Q instrument panel junction block connectors.





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

Standard Voltage:





NG -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Problem Symptoms Table
OK -- Continue to next step.

10. CHECK HARNESS AND CONNECTOR (HEATER CONTROL (BLOWER SWITCH) - BODY GROUND)

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





Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE HEATER CONTROL (BLOWER SWITCH) Removal