Test I: No Instrument Cluster Universal Asynchronous Receiver Transmitter (UART) Based Protocol (UBP) Communications Network CO

PINPOINT TEST I: NO INSTRUMENT CLUSTER UNIVERSAL ASYNCHRONOUS RECEIVER TRANSMITTER (UART) BASED PROTOCOL (UBP) COMMUNICATIONS NETWORK COMMUNICATION

I1-I3:

Normal Operation
The instrument cluster uses the UBP communications network circuit 693 (OG) to communicate with the vehicle security module and the driver seat module (DSM). If circuit 693 (OG) becomes open or shorted to ground, communications to that module will not be possible. Check circuit 693 (OG) between the instrument cluster and the data link connector (DLC) C251. The total resistance value must not be more than 5 ohms. If the resistance is more than 5 ohms there is an open in circuit 693 (OG), damage to the DLC C251, or damage to the instrument cluster C220b.

Possible Causes
- circuit 693 (OG) open
- DLC C251
- instrument cluster
- instrument cluster C220b