Windshield Deicer Does Not Operate

WINDOW / GLASS: WINDSHIELD DEICER SYSTEM: Windshield Deicer does not Operate
- Windshield Deicer 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 windshield deicer.

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 windshield deicer 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. REPLACE AIR CONDITIONING CONTROL ASSEMBLY

(a) Temporarily replace the air conditioning control assembly with a new or normally functioning one (for automatic air conditioning system: Removal, for manual air conditioning system: Removal)

(b) Check the operation of the windshield deicer system.

OK:

The windshield deicer system operates normally.

NG -- CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - BODY GROUND)

OK -- END (AIR CONDITIONING CONTROL ASSEMBLY IS DEFECTIVE)

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 - WINDSHIELD DEICER WIRE)

(a) Disconnect the A47 windshield deicer wire connector.

(b) Disconnect the 1D 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 1D 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 (WINDSHIELD DEICER WIRE - BODY GROUND)

(a) Disconnect the A47 windshield deicer wire (windshield glass) 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 WINDSHIELD DEICER SYSTEM

(a) Check the operation of the windshield deice system.

OK:

The windshield deicer system operates normally.

NG -- REPLACE WINDSHIELD DEICER WIRE (WINDSHIELD GLASS) Removal

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