General Description

CIRCUIT CHART
Circuit assignments for the Body Control Module (BCM) relating to lighting:

DISPLAY DIMMING
Display dimming is controlled by the BCM based on input received from the dimming potentiometer. The dimming potentiometer is connected between circuit 719 and circuit 230. The BCM monitors these inputs and provides a Pulse Width Modulated (PWM) output at circuit 8 to operate the display lamps.

PARK LAMP SWITCH
The BCM compares the state of the park lamp circuit 9 to the high beam headlamp circuit 1200 and the low beam headlamp circuit 1201.

If the park lamp circuit is grounded/open and either the low beam circuit is at battery voltage or the high beam circuit is grounded, DTC B2662 - Parklamp Switch Circuit Malfunction will set.