GM Service Manual Online
For 1990-2009 cars only

Body Control Module (BCM) C68

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine OFF

Battery Voltage Signal

Data Display

Volts

Varies

Rear Defog Relay Cmd.

Data Display

On/Off

Off

Body Control Module (BCM) C60

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine OFF

Battery Voltage Signal

Data Display

Volts

Varies

Rear Defog Relay Cmd.

Data Display

On/Off

Off

Rear Defog Switch

Data Display

On/Off

Off