Troubleshooting Flowcharts

Flowchart No.1 Symptom Rear window defroster does not operate

Possible Cause
^ Burnt DEFOG 40A fuse
^ Damaged rear window defroster relay
^ Damaged rear window defroster switch
^ Damaged rear window defroster
^ Damaged CPU
^ Open or short circuit in wiring harness
^ Poor connection of connector

Fuse Location:

Action Chart:

Step 1
Check the defog 40A fuse in the main fuse block

Voltmeter Connection:

Action Chart:

Step 2
1. Turn the ignition switch to ON.
2. Press the rear window defroster switch.
3. Measure the voltage at terminal C(B/L) of the rear window defroster relay connector.

Voltmeter Connection:

Action Chart:

Step 3
Measure the voltage at the terminal (B/L) of the filament.

Ohmmeter Connection:

Action Chart:

Step 4
1. Turn the ignition switch to OFF.
2. Disconnect the ground-side filament connector.
3. Check for continuity between the (B) terminal wire of the filament connector and ground.





Step 5
NOTE:
^ Relay on KL model located in left hand side engine compartment by battery.
^ Relay on FS model located in right hand side engine compartment by windshield washer tank.





Measure the voltage at terminal A (B/W) of the rear window defroster relay connector.

Voltmeter Connection:

Action Chart:

Step 6
Measure the voltage at terminal D (B/W) of the rear window defroster relay connector.

Terminal Identification:

Reference:

Step 7
1. Turn the ignition switch to OFF.
2. Remove the rear window defroster relay.
3. Check for continuity between the relay terminals.
4. If correct, install the relay and go to Step 8.
5. If not as specified, replace the relay.

Terminal Identification:

Reference:

Step 8
1. Remove the rear window defroster switch.
2. Check for continuity between the switch terminals.
3. If correct, go to Step 9.
4. If not as specified, replace the switch.

Ohmmeter Connection:

Action Chart:

Step 9
Check for continuity between terminal C (B) of the rear window defroster switch connector and ground.

Ohmmeter Connection:

Action Chart:

Step 10
1. Turn the ignition switch to ON.
2. Measure the voltage at terminal 2S (V) of the CPU connector.

Ohmmeter Connection:

Action Chart:

Step 11
1. Turn the ignition switch to OFF.
2. Disconnect the CPU connector.
3. Turn on the rear window defroster switch.
4. Check for continuity between terminal 2T (G) of the CPU connector and ground.