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 A/C control assembly (heater control base sub-assembly), is operated, the operation signals are transmitted to the A/C amplifier assembly through LIN. 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. 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:
NG -- PERFORM ACTIVE TEST USING TECHSTREAM
OK -- Continue to next step.
2. CHECK WIRE HARNESS (A/C CONTROL ASSEMBLY - A/C AMPLIFIER ASSEMBLY)
(a) Disconnect the connector from the A/C control assembly (heater control base sub-assembly).
(b) Disconnect the connector from the A/C amplifier.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:
Result:
C -- REPAIR OR REPLACE HARNESS OR CONNECTOR
B -- REPLACE AIR CONDITIONER CONTROL ASSEMBLY
A -- Continue to next step.
3. REPLACE HEATER CONTROL BASE SUB-ASSEMBLY
(a) Replace the heater control base sub-assembly.
NEXT -- Continue to next step.
4. CONFIRM REAR WINDOW DEFOGGER OPERATION
(a) Turn the ignition switch on (IG), press the defogger switch, and check that the window defogger operates.
OK:
System operates normally
NG -- REPLACE A/C AMPLIFIER ASSEMBLY
OK -- END
5. REPLACE AIR CONDITIONER CONTROL ASSEMBLY
(a) Replace the air conditioner control assembly.
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:
System operates normally
NG -- REPLACE A/C AMPLIFIER ASSEMBLY
OK -- END
7. PERFORM ACTIVE TEST USING TECHSTREAM
(a) Select the Active Test, use Techstream to issue a control command, and then check the DEFOG relay operation.
(b) Check that operation sound of the RR DEF relay is heard.
:
OK -- CHECK WIRE HARNESS (RR DEF RELAY - BATTERY POSITIVE AND BODY GROUND)
NG -- Continue to next step.
8. INSPECT RR DEF RELAY
Testing and Inspection.
NG -- REPLACE RR DEF RELAY
OK -- Continue to next step.
9. CHECK WIRE HARNESS (RR DEF RELAY - BATTERY POSITIVE)
(a) Disconnect the RR DEF relay.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:
Engine room R/B, J/B
NG -- REPAIR OR REPLACE A/C NO. 2 FUSE, HARNESS OR CONNECTOR
OK -- Continue to next step.
10. CHECK WIRE HARNESS (RR DEF RELAY - A/C AMPLIFIER ASSEMBLY)
(a) Disconnect the RR DEF relay and A/C amplifier assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE A/C AMPLIFIER ASSEMBLY
11. CHECK WIRE HARNESS (RR DEF RELAY - BATTERY POSITIVE AND BODY GROUND)
(a) Disconnect the RR DEF relay.
(b) Measure the voltage and resistance according to the value(s) in the table below.
Standard resistance:
Engine room R/B, J/B
Standard voltage:
Engine room R/B, J/B
NG -- REPAIR OR REPLACE RR DEF FUSE, HARNESS OR CONNECTOR
OK -- Continue to next step.
12. INSPECT NOISE FILTER
(a) Disconnect the noise filter connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPLACE NOISE FILTER
OK -- Continue to next step.
13. CHECK WIRE HARNESS (RR DEF RELAY - NOISE FILTER)
(a) Disconnect the RR DEF relay and defogger wire 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.
14. CHECK WIRE HARNESS (NOISE FILTER - DEFOGGER WIRE CONNECTOR)
(a) 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.
15. CHECK WIRE HARNESS (DEFOGGER WIRE CONNECTOR - 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 -- REPAIR OR REPLACE REAR WINDOW DEFOGGER WIRE