Chart B-1 BCM Power and Grounds

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION

The loss of BCM functions can result from the following:

^ Loss of + 12 volt power (CKT 640) to the BCM

^ Loss of ground (CKT 803) to the BCM

^ Internal BCM fault

TEST DESCRIPTION

Numbers below refer to circled numbers on the diagnostic chart.

1. The BCM is not receiving a +12 volt input therefore check the power and ground supply to the BCM.

2. This step checks for a short to ground in any of the 640 CKTs.

3. Checks to see if the short to ground is inside a component or in the circuit itself.