Test D: The Instrument Cluster Does Not Respond To The Diagnostic Tool

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

D1-D2:

D2-D3:

D4-D5:

Normal Operation
The instrument cluster communicates with the diagnostic tool through the standard corporate protocol (SCP) communications network circuits 4-EG7 (GY/RD) and 5-EG7 (BU/RD). If one of the communications network circuits become shorted to ground or voltage, or if some but not all termination resistors are lost, communications can continue. Check circuits 4-EG7 (GY/RD) and 5-EG7 (BU/RD) between the instrument cluster C220b and the data link connector (DLC) C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms there is an open in circuits 4-EG7 (GY/RD) and 5-EG7 (BU/RD), damage to the DLC C251, joint connector No. 4 or damage to the instrument cluster C220b.

Possible Causes
- SCP data plus circuit 4-EG7 (GY/RD) open
- SCP data minus circuit 5-EG7 (BU/RD) open
- joint connector No. 4 C223
- instrument cluster C220b
- instrument cluster