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 heater control assembly*1 or multi-display*2, is operated, the operation signals are transmitted to the A/C amplifier assembly through LIN*1 or CAN*2. When the A/C amplifier assembly receives the signals, it turns on the RR DEF relay to operate the rear window defogger.
* *1: w/o Navigation System
* *2: w/ Navigation System
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:
OK:
The window defogger system operates normally.
NG -- PERFORM ACTIVE TEST USING TECHSTREAM
OK -- Continue to next step.
2. CHECK AIR CONDITIONING SYSTEM
(a) Check the air conditioning system.
HINT
Both the window defogger system operation signal and air conditioning system operation signal are transmitted to the air conditioning amplifier assembly through same communication line.
OK:
The air conditioning system operates normally.
NG -- GO TO AIR CONDITIONING SYSTEM
OK -- Continue to next step.
3. REPLACE AIR CONDITIONING CONTROL ASSEMBLY*1 OR MULTI-DISPLAY*2
(a) Replace the air conditioning control assembly*1 or multi-display*2.
*1: w/o Navigation System
*2: w/ Navigation System
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 the window defogger operates.
OK:
The window defogger system operates normally.
NG -- REPLACE A/C AMPLIFIER ASSEMBLY
OK -- END
5. 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 -- INSPECT RR DEF RELAY
NG -- Continue to next step.
6. INSPECT RR DEF RELAY
(a) Remove the RR DEF relay from the engine room relay block.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
If the result is not as specified, replace the relay.
NG -- REPLACE RR DEF RELAY
OK -- Continue to next step.
7. 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.
8. 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
9. INSPECT RR DEF RELAY
(a) Remove the RR DEF relay from the engine room relay block.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
If the result is not as specified, replace the relay.
NG -- REPLACE RR DEF RELAY
OK -- Continue to next step.
10. 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.
11. 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.
12. 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.
13. 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.
14. 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