Circuit Description

WARNING: This page is about a different car, the 1999 GMC Sierra and 1999 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

BCM monitors and supplies voltage to Automatic Headlight (AHL) relay on circuit No. 352 (White wire). When BCM detects battery voltage on circuit No. 352, it turns off Daytime Running Lights (DRL). When BCM detects circuit No. 352 is low, it will turn on DRL.

Conditions for setting DTC:

Ignition on.
Headlights in AUTO position.
Ambient light sensor in DARK state.
Parking brake must be released.
When there is short to ground in circuit No. 352 (White wire).
System voltage 9-16 volts.
Conditions present for .5 second.