No. 3 Heated Outside Mirrors Do Not Operate-Rear Defogger Inop

Flowchart No. 3 Symptom Heated outside mirrors do not operate (rear window defroster does not operate)

Possible cause
^ Burnt ENGINE 15A fuse
^ Burnt DEFOG 40A fuse
^ Damaged rear window defroster relay
^ Damaged rear window defroster switch
^ Damaged heated outside mirror
^ Damaged CPU
^ Open or short circuit in wiring harness Poor connection of connector

Fuse Inspection:

Action Chart:

Step 1
Check the ENGINE 15A fuse in the fuse block.

Fuse Location:

Action Chart:

Step 2
Check the DEFOG 40A fuse in the main fuse block.

Step 3
1. Turn the ignition switch to ON.
2. Turn on the rear window defroster switch.

Voltmeter Connection:

Action Chart:

3. Measure the voltage at the (B/L) terminal wire of the outside mirror connector.

Step 4
1. Turn the ignition switch to OFF.

Ohmmeter Connection:

Action Chart:

2. Disconnect the outside mirror connector and check for continuity between the (B) terminal wire of the outside mirror connector and ground.

Voltmeter Connection:

Action Chart:

Step 5
Measure the voltage at the (B/W) terminal wire of the rear window defroster relay connector.

Voltmeter Connection:

Action Chart:

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

Terminal Identification:

Reference:

Step 7
1. Turn the ignition switch to OFF.
2. Disconnect the rear window defroster relay connector.
3. Check for continuity between the terminals of the relay while applying battery positive voltage as indicated below.
4. If correct, reconnect the relay and go to Step 8.
5. If not as specified, replace the relay.

Step 8
1. Turn the ignition switch to ON.

Voltmeter Connection:

Action Chart:

2. Measure the voltage at the (V) terminal wire of the CPU connector (20-pin).

Step 9
1. Turn the ignition switch to OFF.
2. Disconnect the CPU connector (20-pin).
3. Turn the rear window defroster switch to ON.

Ohmmeter Connection:

Action Chart:

4. Check for continuity between the (G) terminal wire of the CPU connector and ground.

Step 10
1. Remove the rear window defroster switch.
2. Disconnect the rear window defroster switch connector.

Ohmmeter Connection:

Action Chart:

3. Check for continuity between the (B) terminal wire of the rear window defroster switch connector and ground.

Step 11

Terminal Identification:

Reference:

1. Check for continuity between the terminals of the rear window defroster switch.
2. If correct, repair the wiring harness (CPU-rear window defroster switch).
3. If not as specified, replace the rear window defroster switch.