GM Service Manual Online
For 1990-2009 cars only
Table 1: Body Control Module
Table 2: HVAC Control Module

Body Control Module

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON/Engine OFF/Vehicle in PARK/All Doors Closed

LR Window Down Cmd.

Doors

On/Off

Off

LR Window Enable Cmd.

Doors

On/Off

Off

LR Window Up Cmd.

Doors

On/Off

Off

RR Window Down Cmd.

Doors

On/Off

Off

RR Window Enable Cmd.

Doors

On/Off

Off

RR Window Up Cmd.

Doors

On/Off

Off

HVAC Control Module

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON/Engine OFF/Vehicle in PARK

Rear Defrost LED

HVAC System Data

On/Off

Off

Rear Defrost State

HVAC System Data

On/Off

Off

Rear Defrost Switch

Inputs

Active/Inactive

Inactive