GM Service Manual Online
For 1990-2009 cars only
Table 1: BCM Data
Table 2: RCDLR Data

BCM Data

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON, Engine OFF

Accy. Indicator Command

Data

On/Off

Off

Accy. Relay Command

Data

On/Off

On

Auxiliary Power

Data

On/Off

On

Battery Voltage Signal

Data

Volts

12.5

Brake Apply Sensor Reference Signal

Data

Volts

5

Current Power Mode

Data

OFF/ACC/RUN/CRANK

RUN

Idle Boost Level

Data

%

Varies

Ignition Cycle Counter

Data

Counts

Varies

Ignition Mode Switch

Data

Volts

12.5

Ign. Mode Sw. Dimming Command

Data

On/Off

On

Inadvertent Power Cmd.

Data

On/Off

Off

Inadvertent Power Signal

Data

Active/Inactive

Active

Key in Cylinder Switch

Data

Active/Inactive

Inactive

Off Indicator Command

Data

On/Off

Off

Run/Crank Relay Command

Data

On/Off

On

Start Indicator Command

Data

On/Off

On

RCDLR Data

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON, Engine OFF

Battery Voltage Signal

Data

Volts

12.5

Ignition Mode Switch

Data

Idle, ACC/OFF, Crank

Idle

Run/Crank Relay Command

Data

On/Off

Off