Rear Window Defogger System Does Not Operate (to 12/2010)

WINDSHIELD / 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 A/C control assembly, is operated, the operation signals are transmitted to the A/C amplifier assembly via LIN. Then the A/C amplifier assembly transmits the operation signal to the front controller via BEAN. When the A/C amplifier assembly receives the signals, it turns on the RR DEF relay to operate the rear window defogger.

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* Inspect the fuses for circuits related to this system before performing the following inspection procedure.
* Since the window defogger system uses BEAN communication, first confirm that there is no malfunction in the BEAN communication line. Refer to the How to Proceed with Troubleshooting procedure How To Proceed With Troubleshooting (to 12/2010).

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body / Air Conditioner / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Air Conditioner (A/C Amplifier Assembly)





Result:





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

2. CHECK HARNESS AND CONNECTOR (LIN COMMUNICATION LINE)

(a) Disconnect the A/C control assembly and A/C amplifier assembly 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. REPLACE A/C CONTROL ASSEMBLY

(a) Replace the A/C control assembly Removal (to 12/2010).

NEXT -- Continue to next step.

4. CHECK WINDOW DEFOGGER OPERATION

(a) Turn the ignition switch to ON, press the rear window defogger switch, and check that the rear window defogger operates.

OK:

Rear window defogger system operates normally.

NG -- REPLACE A/C AMPLIFIER ASSEMBLY Removal (to 12/2010)

OK -- END (A/C CONTROL ASSEMBLY WAS DEFECTIVE)

5. PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body / Air Conditioner / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Air Conditioner (A/C Amplifier Assembly)





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

Result:





B -- CHECK HARNESS AND CONNECTOR (NOISE FILTER - BATTERY)
A -- 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:





Text in Illustration





NG -- REPLACE RR DEF RELAY
OK -- Continue to next step.

7. CHECK HARNESS AND CONNECTOR (RR DEF RELAY - BATTERY)

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





Standard Voltage:





Text in Illustration





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

8. REPLACE ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK

(a) Replace the engine room relay block and junction block.

NEXT -- Continue to next step.

9. CHECK WINDOW DEFOGGER OPERATION

(a) Turn the ignition switch to ON, press the rear window defogger switch, and check that the rear window defogger operates.

OK:

Rear window defogger system operates normally.

NG -- REPLACE A/C AMPLIFIER ASSEMBLY Removal (to 12/2010)

OK -- END (ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK WAS DEFECTIVE)

10. CHECK HARNESS AND CONNECTOR (NOISE FILTER - BATTERY)

(a) Disconnect the noise filter connector.

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

Standard Voltage:





NG -- INSPECT RR DEF RELAY
OK -- Continue to next step.

11. INSPECT NOISE FILTER

(a) Remove the noise filter.





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

Standard Resistance:





Text in Illustration





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

12. CHECK HARNESS AND CONNECTOR (NOISE FILTER - DEFOGGER WIRE CONNECTOR)

(a) Disconnect the 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 -- Continue to next step.

13. CHECK HARNESS AND CONNECTOR (DEFOGGER WIRE CONNECTOR - BODY GROUND)

(a) Disconnect the 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 WINDOW DEFOGGER WIRE

14. 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:





Text in Illustration





NG -- REPLACE RR DEF RELAY
OK -- Continue to next step.

15. CHECK HARNESS AND CONNECTOR (RR DEF RELAY - BATTERY)

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





Standard Voltage:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (RR DEF RELAY - NOISE FILTER)