GM Service Manual Online
For 1990-2009 cars only

Body Control Module (BCM)

Battery Voltage: The scan tool displays 0-20 volts. The scan tool displays the voltage as received by the BCM.

Shift Lock Solenoid Command: The scan tool displays On and Off. The scan tool displays the status of the shift lock control to the BCM.

Electronic Brake Control Module (EBCM)

BPP Signal: The scan tool displays Applied and Released. The scan tool displays Applied when the brake pedal is depressed and Released when the brake pedal is released.

Transmission Control Module (TCM)

IMS: The scan tool displays Invalid, Drive 2, Reverse\Neutral, Neutral, Drive 6, Neutral\Drive 6, Park, Drive 3, Reverse, Park\Reverse or Drive 4. The scan tool displays the position of the transmission internal mode switch (IMS).

TR Sw. : The scan tool displays Park, Reverse, Neutral, Drive 5, Drive 4, Drive 3, Drive 2 or Drive 1. The scan tool displays the position of the transmission range switch.