Test D

PINPOINT TEST D: THE INSTRUMENT CLUSTER DOES NOT RESPOND TO THE DIAGNOSTIC TOOL

Test D1-D3:

Normal Operation
The instrument cluster communicates with the diagnostic tool through the standard corporate protocol (SCP) communications network. Circuits 4-EG8 (GY/VT) and 5-EG8 (BU/WH) receive and transmit data from the instrument cluster to the data link connector (DLC). Degraded SCP performance occurs if one bus line is open, shorted to ground or voltage, or if one but not all termination resistors are lost.

Possible Causes
- circuit 4-EG8 (GY/VT) open
- circuit 5-EG8 (BU/WH) open
- instrument cluster C220b
- instrument cluster