No Communication to Instrument Cluster

WHEN MONITORED
With the ignition on.

SET CONDITION
Serial Communication K2 failure between the A/C Heater Control Module and the Instrument Cluster.

POSSIBLE CAUSES
- Serial communication K2 circuit open
- Instrument cluster
- A/C heater control module

Diagnostic Test




1. MEASURE THE RESISTANCE OF THE SERIAL COMMUNICATION K2 CIRCUIT

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

NOTE:
- Check connector - Clean/repair as necessary. Disconnect the A/C Heater Control Module harness connector.

- Check connector - Clean/repair as necessary. Measure the resistance of the Serial Communication K2 circuit from the Instrument Cluster harness connector to the A/C Heater Control Module harness connector.

Q: Is the resistance below 5.0 ohms?

YES: Replace the A/C Heater Control Module. Perform BODY VERIFICATION TEST. Body Verification Test
NO: Repair the Serial Communication K2 circuit for an open. Perform BODY VERIFICATION TEST. Body Verification Test