Chart B-1, BCM Power & Grounds - REATTA & Riviera

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

Courtesy of GENERAL MOTORS CORP.

The loss of BCM functions can result from the following:

• Loss of 12-volt power on circuit No. 640 to BCM
• Loss of ground on circuit No. 803 to BCM
• Internal BCM fault
  NOTE: Test numbers refer to numbers on diagnostic chart.
  1. BCM is not receiving 12-volt input. Check power and ground supply to BCM.
  2. This step checks for short to ground in any part of circuit No. 640.
  3. Checks to see if the short to ground is inside a component or in the circuit itself.

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

Courtesy of GENERAL MOTORS CORP.