Chart A, Blank Odometer Display - REATTA & Riviera

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

Courtesy of GENERAL MOTORS CORP.

Loss of IPC display and messages can result from the following:

• Loss of 12 volt power to IPC (circuit No. 812)
• Loss of ground to IPC (circuit No. 803)
• Internal fault in CPS or IPC.
  NOTE: Test numbers refer to numbers on diagnostic chart.
  1. This test checks the IPC power and grounds.
  2. Power, Ignition 3 and ground circuits to IPC are functioning properly; therefore, fault is either in terminal contacts or internal to the IPC.
  3. The 12-volt feed to the IPC is not functioning. Check for open in circuit No. 640.

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

Courtesy of GENERAL MOTORS CORP.