GM Service Manual Online
For 1990-2009 cars only

Body Control Module (BCM)

Scan Tool Output Control

Additional Menu Selection(s)

Description

Headlamp Relay

Light Test

The BCM activates the low beam headlamp relay when you select ON. The low beam headlamps illuminate until commanded OFF.

Instrument Back Light Dimmer

Light Test

The BCM activates the I/P LED then dims the LED up or down when you select up or down.

Interior Lamps

Light Test

The BCM activates the interior lamps relay when you select ON. The interior lamps illuminate until commanded OFF.

Turn Signal Relay

Light Test

The BCM activates the Flasher relay when you select ON. The turn signals illuminate until commanded OFF.

Twilight Sentinal

Light Test

The BCM activates the low beam headlamp relay when you select ON. The low beam headlamps illuminate until commanded OFF.