PCM Messages Not Received

Test 1 - 2:

SYMPTOM
PCM MESSAGES NOT RECEIVED

WHEN MONITORED
When the Navigation Unit is powered up.

SET CONDITION
If the Vehicle Speed message is not received, the NAV system will have the vehicle icon remain stationary. If no vehicle speed message is received for 2 seconds and the vehicle is in Drive, full programming will be disabled.

POSSIBLE CAUSES
- DTC intermittent condition
- PCM DTC present
- Navigation unit