Body Control System: Overview Pontiac Sunfire I

Test Description

The number below refers to the step number on the diagnostic table.

Scheme 33

1. If DTC B1001 is set as current, reprogram the module.

The numbers listed below refer to the numbers on the diagnostic table.

Scheme 34

1. This step determines if the ignition 1 input is shorted to ground.
2. This step determines if the BCM is internally shorted.
3. This step determines if the instrument cluster is internally shorted.
4. This step determines if voltage is supplied from the battery to the BCM/CLU fuse.

Scheme 35

The numbers listed below refer to the numbers on the diagnostic table.

Scheme 36

1. This step determines if the accessory input is shorted to ground.
2. This step determines if the BCM is internally shorted.
3. This step determines if voltage is supplied from the battery to the BCM fuse.

Scheme 37

The numbers below refer to the step numbers on the diagnostic table.

Scheme 38

1. This step tests for battery voltage on the signal circuits that are not required.
2. This step tests for no battery voltage on the required signal circuits.
3. If any ignition switch parameters that should be inactive in the present ignition switch position are active, 2 ignition switch signal circuits may be shorted together.
4. This step eliminates open circuits as the cause of the malfunction.

Scheme 39

Scheme 40

Fail-safe Operation

Since the operation of the vehicle systems depends on the power mode, there is a fail-safe plan in place should the PMM fail to send a power mode message. The fail-safe plan covers those modules using exclusively serial data control of power mode as well as those modules with discrete ignition signal inputs.