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

When the rear window defogger switch, which is built into the air conditioning control assembly, is operated, the operation signals are transmitted to the air conditioning amplifier assembly through LIN. When the air conditioning amplifier assembly receives the signals, it turns on the DEFOGGER relay (Marking: RR DEF) to operate the rear window defogger.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK FUSES (RR DEF)

(a) Remove the fusible link block assembly (RR DEF) from the engine room relay block.





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

Standard resistance:





NG -- REPLACE FUSIBLE LINK BLOCK ASSEMBLY (RR DEF FUSE)
OK -- Continue to next step.

2. INSPECT DEFOGGER RELAY (Marking: RR DEF)

(a) Remove the defogger relay (Marking: RR DEF) from the engine room relay block.





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

Standard resistance:





NG -- REPLACE DEFOGGER RELAY (Marking: RR DEF)
OK -- Continue to next step.

3. PERFORM ACTIVE TEST USING TECHSTREAM

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

Air Conditioner:





Result:





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

4. CHECK HARNESS AND CONNECTOR (LIN COMMUNICATION LINE)

(a) Disconnect the D37 air conditioning amplifier connector.





(b) Disconnect the E10 air conditioning control 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.

5. REPLACE AIR CONDITIONING CONTROL ASSEMBLY

(a) for Automatic Air Conditioning System

(1) Replace the air conditioning control assembly Removal.

(b) for Manual Air Conditioning System

(1) Replace the air conditioning control assembly Removal.

NEXT -- Continue to next step.

6. CONFIRM REAR WINDOW DEFOGGER OPERATION

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

OK:

Window defogger system operates normally

NG -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal

OK -- END

7. PERFORM ACTIVE TEST USING TECHSTREAM

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

Air Conditioner:





(b) Check that operation sound of the DEFOGGER relay (Marking: RR DEF) is heard.

Result:





A -- CHECK HARNESS AND CONNECTOR (REAR WINDOW DEFOGGER WIRE - ENGINE ROOM RELAY BLOCK)
B -- Continue to next step.

8. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER ASSEMBLY - ENGINE ROOM RELAY BLOCK)

(a) Disconnect the D37 air conditioning amplifier connector.





(b) Disconnect the defogger relay (Marking: RR DEF) engine room relay block.

(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 (RDEF TERMINAL BATTERY VOLTAGE)

(a) Reconnect the defogger relay (Marking: RR DEF) engine room relay block.





(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 -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal

10. CHECK HARNESS AND CONNECTOR (REAR WINDOW DEFOGGER WIRE - ENGINE ROOM RELAY BLOCK)

(a) w/ Glass Hatch Opener





(1) Disconnect the Y2 connector.

(2) Remove the defogger relay (Marking: RR DEF) from the engine room relay block.

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

Standard resistance:





(b) w/o Glass Hatch Opener





(1) Disconnect the T12 connector.

(2) Remove the defogger relay (Marking: RR DEF) from the engine room relay block.

(3) 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.

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

(a) w/ Glass Hatch Opener





(1) Reconnect the defogger relay (Marking: RR DEF) from the engine room relay block.

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

Standard voltage:





(b) w/o Glass Hatch Opener





(1) Reconnect the defogger relay (Marking: RR DEF) from the engine room relay block.

(2) 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.

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

(a) w/ Glass Hatch Opener





(1) Disconnect the Y2 connector.

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

Standard resistance:





(b) w/o Glass Hatch Opener





(1) Disconnect the T11 connector.

(2) 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