1000 - 1999: 1745

1745-01 NO COMMUNICATION FROM HVAC SHORTED TO BATTERY





When Monitored and Set Condition

- When Monitored: With the ignition on.
- Set Condition: Serial Communication K2 failure between the A/C Heater Control Module and the Instrument Cluster.





For a complete Instrument Cluster Circuit Diagram,Schematics and Diagrams.

Diagnostic Test

1. MEASURE THE VOLTAGE OF THE SERIAL COMMUNICATION K2 CIRCUIT




Turn the ignition off.
Disconnect the Instrument Cluster harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Turn the ignition on.
Measure the voltage of the Serial Communication K2 circuit.
Is the voltage above 5.0 volts?

No

- Replace the Instrument Cluster. Instrument Cluster - Removal.
- Perform BODY VERIFICATION TEST. Body Verification Test

Yes

- Go to 2

2. DISCONNECT THE A/C HEATER CONTROL MODULE
Turn the ignition off.
Disconnect the A/C Heater Control Module harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Turn the ignition on.
Measure the voltage of the Serial Communication K2 circuit.
Is the voltage above 5.0 volts?

Yes

- Repair the Serial Communication K2 circuit for a short to voltage.
- Perform BODY VERIFICATION TEST. Body Verification Test

No

- Replace the A/C Heater Control Module. Removal.
- Perform BODY VERIFICATION TEST. Body Verification Test