9000 - 9999: 9079

9079-WINDSHIELD HEATER CONTROL CIRCUIT HIGH





For a complete wiring diagram, Refer to the Wiring Information Electrical Diagrams.

- When Monitored:
Continuously.

- Set Condition:
If the Voltage on the Heated Windshield Relay Control circuit is other than expected.





1. ERASE AND ATTEMPT TO RESET DTC
1. Turn the ignition on.
2. With the scan tool, record and erase BCM DTCs.
3. Start the engine.
4. Operate the heated windshield switch several time.
5. With the scan tool, read BCM DTCs.

Does the scan tool display 9079-WINDSHIELD HEATER CONTROL CIRCUIT HIGH?

Yes

- Go To 2

No

- The condition that caused this symptom is currently not present. Inspect the related wiring harness for a possible intermittent condition.
- Perform BODY VERIFICATION TEST. Verification Tests.

2. INSTALL KNOWN GOOD RELAY
1. Turn the ignition off.
2. Substitute the original Heated Windshield Relay with a known good relay.
3. Turn the ignition on.
4. With the scan tool, erase BCM DTCs.
5. Start the engine.
6. Operate the Heated Windshield switch several times.
7. With the scan tool, read BCM DTCs.

Does the scan tool display 9079-WINDSHIELD HEATER CONTROL CIRCUIT HIGH?

Yes

- Go To 3

No

- Replace the original Heated Windshield Relay.
- Perform BODY VERIFICATION TEST. Verification Tests.

3. OPEN GROUND CIRCUIT
1. Turn the ignition off.
2. Disconnect the Heated Windshield Relay.
3. Measure the resistance of the Ground circuit at the Heated Windshield Relay connector.

Is the resistance above 3.0 ohms?

Yes

- Repair the open relay Ground circuit.
- Perform BODY VERIFICATION TEST. Verification Tests.

No

- Go To 4

4. HEATED WINDSHIELD RELAY CONTROL CIRCUIT SHORT TO VOLTAGE
1. Disconnect the Body Control Module C9 connector.
2. Turn the ignition On.
3. Measure the Voltage of the Heated Windshield Relay Control circuit at the relay connector to ground.

Is the Voltage above 1.0 Volt?

Yes

- Repair the Heated Windshield Relay Control circuit for a short to Voltage.
- Perform BODY VERIFICATION TEST. Verification Tests.

No

- Go To 5

5. HEATED WINDSHIELD RELAY CONTROL CIRCUIT OPEN
1. Turn the ignition off.
2. Measure the resistance of the Heated Windshield Relay Control circuit between the BCM connector and the relay connector.

Is the resistance below 5.0 ohms?

Yes

- Replace the Body Control Module (BCM).
- Perform BODY VERIFICATION TEST. Verification Tests.

No

- Repair the Heated Windshield Relay Control circuit for an open.
- Perform BODY VERIFICATION TEST. Verification Tests.