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 back door power window is fully closed and the rear window defogger switch is turned on, a rear window defogger activation request signal is sent via the LIN communication line to the air conditioning amplifier.

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 has functions that use LIN communication, first confirm that there is no malfunction in the communication system by inspecting the LIN communication functions in accordance with the "How to Proceed with Troubleshooting" procedures. Then, conduct the following inspection procedure.
* Since the window defogger system does not operate if the back power window is not operating normally, confirm that the back power window of the power window system is operating normally before performing troubleshooting.

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM (DEFOGGER RELAY [REAR])

(a) Using the Techstream, perform the Active Test Scan Tool Testing and Procedures.

Air Conditioner





OK:

The DEF relay operates normally.

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

2. REPLACE HEATER CONTROL ASSEMBLY

(a) Temporarily replace the heater control with a new or normally functioning one Removal.

(b) Check the rear defogger function.

OK:

The window defogger function operates normally.

NG -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal

OK -- END (HEATER CONTROL ASSEMBLY IS DEFECTIVE)

3. INSPECT DEF RELAY

(a) Remove the DEF relay from the engine room relay block, junction block.





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

Standard Resistance:





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

4. CHECK HARNESS AND CONNECTOR (BATTERY - DEF RELAY)

(a) Remove the DEF relay from the engine room relay block, junction block.





(b) 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.

5. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - DEF RELAY AND BODY GROUND)

(a) Disconnect the F42 air conditioning amplifier connector.

(b) Remove the DEF relay from the engine room relay block, junction 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.

6. INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY

(a) Reconnect the F42 air conditioning amplifier connector.

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





Standard Voltage:





Text in Illustration





NG -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal
OK -- Continue to next step.

7. CHECK HARNESS AND CONNECTOR (BACK DOOR GLASS - DEF RELAY AND BODY GROUND)

(a) Disconnect the W1 and W2 back door glass (window defogger wire) connectors.

(b) Remove the DEF relay from the engine room relay block, junction block.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE BACK DOOR GLASS (WINDOW DEFOGGER WIRE)