Circuit Description

Body Control Module (BCM) monitors voltage in circuit No. 352 (White wire) to determine if headlight power relay (all except Envoy) or low beam relay (Envoy) was requested ON. See WIRING DIAGRAMS  . If battery voltage is not sensed on this circuit and BCM is requesting appropriate relay on, DTC will set.

Conditions for setting DTC:

• Ignition switch in RUN position.
• Headlight switch in AUTO/OFF position.
• Ambient light sensor in dark state.
• Parking brake is released.
• When there is short to ground in circuit No. 352 (White wire).
• System voltage 9-16 volts.
• Conditions present for .5 second.