Chart D-1, Grounded Serial Data Circuit - REATTA & Riviera

Fig 1: Chart D-1 & D-2 - Wiring Schematic (Reatta & Riviera)

Courtesy of GENERAL MOTORS CORP.

With grounded serial data circuit, BCM will not be able to communicate with any other devices in system. Voltage measured anywhere in circuit will zero. IPC will display ELECTRICAL PROBLEM; ECCP will display dashes ("---").

1. This step splits the system in half to help isolate source of grounded serial data line. If taking IPC out of the system allows both halves of serial data line to rise more than one volt, source of short has been located. The remaining steps follow same pattern in that components are removed from serial data line until normal voltage range is again measured. When section of circuit is isolated, a simple check of wire for short to ground will differentiate between grounded wire or ground in a device remote.

Fig 2: Chart D-1 - Troubleshooting Diagram (Reatta & Riviera)

Courtesy of GENERAL MOTORS CORP.