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 rear window defogger switch on the air conditioning control assembly is pressed, the operation signal is transmitted to the air conditioning amplifier assembly through a LIN communication line. When the air conditioning amplifier assembly receives the signal, it turns on the integration 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.

PROCEDURE

1. 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 the same communication line.

Result





C -- GO TO AIR CONDITIONING SYSTEM (for Manual Air Conditioning System) How to Proceed With Troubleshooting

B -- GO TO AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System) How to Proceed with Troubleshooting
A -- Continue to next step.

2. PERFORM ACTIVE TEST USING TECHSTREAM (DEFOGGER RELAY)

(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 Electrical / Air Conditioner / Active Test.

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

Air Conditioner (Air Conditioning Amplifier Assembly)





Result





C -- REPLACE AIR CONDITIONING CONTROL ASSEMBLY (for Manual Air Conditioning System) Removal

B -- REPLACE AIR CONDITIONING CONTROL ASSEMBLY (for Automatic Air Conditioning System) Removal
A -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - BODY GROUND)

(a) Disconnect the 1C and 1D integration relay 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.

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

(a) Disconnect the 1C and 1D integration relay connectors.

(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 - INTEGRATION RELAY)

(a) Disconnect the D75 air conditioning 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 -- Continue to next step.

6. CHECK INTEGRATION RELAY

(a) Reconnect the 1C and 1D integration relay connectors.

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





Standard Voltage:





Text in Illustration





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

7. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

(a) Reconnect the D75 air conditioning amplifier assembly 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.

8. CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - REAR WINDOW DEFOGGER WIRE)

(a) Disconnect the W5 rear window defogger wire (back window glass) battery side connector.

(b) Disconnect the 1E integration relay 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.

9. CHECK INTEGRATION RELAY

(a) Reconnect the 1E integration relay connector.

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





Standard Voltage:





Text in Illustration





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

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

(a) Disconnect the W18 rear window defogger wire (back window glass) ground side 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.

11. CHECK WINDOW DEFOGGER SYSTEM

(a) Check the operation of the window defogger system.

OK:

The rear window defogger system operates normally.

NG -- REPLACE REAR WINDOW DEFOGGER WIRE (BACK WINDOW GLASS) Removal

OK -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting