No Cluster CCD Bus Message

NOTE: This code becomes active and stored as soon as the malfunction is detected.

WHEN MONITORED: Continuously with the ignition on.

SET CONDITION: Air bag warning lamp status message from the instrument cluster is not received by the ACM once within 2 seconds.

THEORY OF OPERATION: The body control module drives all cluster read outs (gauges and lamps) except the air bag warning lamp. The ACM sends an air bag warning lamp message (on or off) to the cluster and then receives a status message from the cluster as to the state of the lamp (on or off). If the ACM does not receive the status message from the instrument cluster within 2 seconds, this code is set.

POSSIBLE CAUSES:
- Open or shorted CCD bus lines (may be viewed in stored code once the bus is repaired)
- Intermittent bus failure
- Faulty instrument cluster
- Open or shorted fused B(+) circuit to cluster
- Open or shorted fused ignition switch output circuit to cluster
- Open fuse

For diagnostic procedures see DIAGNOSTIC CHARTS/TEST 1A. 1A Testing System Function