HVAC

900E-GLOW PIN CIRCUIT HIGH (ZHZ)

For a complete wiring diagram Consult Diagrams/Electrical.

- When Monitored:
Whenever the module is awake.

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





Diagnostic Test

1. TEST FOR INTERMITTENT CONDITION
With the scan tool, record and erase DTC's
Turn the ignition on and wait 30 seconds.
Operate the Auxiliary Heater system.
With the scan tool, read DTC's.
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 BODY VERIFICATION TEST - VER 1.Verification Tests

2. GLOW PIN CIRCUIT SHORTED TO VOLTAGE
Turn the ignition off.
Disconnect the Warm Water Auxiliary Heating 2 Control Unit harness connectors.
Disconnect the Glow Pin harness connector.
Turn the ignition on.
Measure the voltage of the Glow Pin circuit.
Is there any voltage present?

Yes

- Repair the Glow Pin circuit for a short to voltage.
- Perform BODY VERIFICATION TEST - VER 1. Verification Tests.

No

- Go to 3

3. GLOW PIN CIRCUIT OPEN
Turn the ignition off.
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 BODY VERIFICATION TEST - VER 1. Verification Tests.

No

- Go To 4

4. GLOW PIN GROUND CIRCUIT OPEN
Turn the ignition off.
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 BODY VERIFICATION TEST - VER 1. Verification Tests.

No

- Replace the Warm Water Auxiliary Heating 2 Control Unit.
- Perform BODY VERIFICATION TEST - VER 1.Verification Tests