Auxiliary Heater (ZHZ)

9010-GLOW PIN CIRCUIT OPEN (ZHZ)

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

- When Monitored:
Whenever the module is awake.

- Set Condition:
When the Glow Pin circuit is shorted high.





1. TEST FOR INTERMITTENT CONDITION
1. With the scan tool, record and erase DTCs
2. Turn the ignition on and wait 30 seconds.
3. Operate the Auxiliary Heater system.
4. With the scan tool, read DTCs.

Does the scan tool display this DTC as active?

Yes

- Go To 2

No

- The condition that caused this symptom is currently not present. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Repair as necessary.
- Perform the BODY VERIFICATION TEST. Verification Tests.

2. GLOW PIN CIRCUIT OPEN
1. Turn the ignition off.
2. Disconnect the Glow Pin harness connector.
3. Disconnect the Warm Water Auxiliary Heating 2 Control Unit harness connectors.
4. Measure the resistance of the Glow Pin circuit.

Does the Ohm meter read open circuit?

Yes

- Repair the Glow Pin circuit for an open.
- Perform the BODY VERIFICATION TEST. Verification Tests.

No

- Go To 3

3. GLOW PIN GROUND CIRCUIT OPEN
1. Turn the ignition off.
2. Measure the resistance of the Glow Pin Ground circuit.

Does the Ohm meter read open circuit?

Yes

- Repair the Glow Pin Ground circuit for an open.
- Perform the BODY VERIFICATION TEST. Verification Tests.

No

- Replace the Warm Water Auxiliary Heating 2 Control Unit.
- Perform the BODY VERIFICATION TEST. Verification Tests.