GM Service Manual Online
For 1990-2009 cars only

Body Control Module (BCM)

Shift Lock Solenoid Command: Displays indicate OFF when the brake switch is depressed.

Engine Control Module (ECM)

BPP Circuit Signal: Displays Applied or Release. Displays the status of the BPP circuit signal..

Ignition 1 Signal: Display indicates voltage. Displays the voltage of the Ignition 1 signal.

PNP Switch: Displays In Gear or Park/Neutral. Displays the status of the PNP switch.

Transmission Control Module (TCM)

Ignition Voltage: Displays the ignition voltage.

IMS: Displays Invalid, Drive 2, Reverse\Neutral, Neutral, Drive 6, Neutral\Drive 6, Park, Drive 3, Reverse, Park\Reverse and Drive 4. Displays the position of the transmission range switch.

TCC Brake Switch: Displays Closed or Open. Displays the status of the TCC Brake switch.