GM Service Manual Online
For 1990-2009 cars only

Body Control Module (BCM)

Scan Tool Output Control

Additional Menu Selection(s)

Description

Light Test

Daytime Running Lamps

The BCM activates the DRL relay when there is sufficient light to the ambient light sensor and you select ON. The daytime running lights will remain illuminated until commanded OFF.

Light Test

Parking Lamps

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

Lamp Dimming Test

Dimming

The BCM adjusts the dimming output level when you select the percentage of illumination desired. The dimmable I/P lamps will illuminate to the level set by the scan tool when the I/P dimmer switch is in the FULL DIM position.