Low Beam Headlamps (T4L)

The headlamps may be turned ON in 3 different ways:

• When the headlamp switch is placed in the ON position, for normal operation
• When the headlamp switch is placed in the AUTOMATIC LIGHT position, for automatic lamp control
• When the headlamp switch is placed in the AUTOMATIC LIGHT position, with the windshield wipers ON in daylight conditions, after a 6 s delay

The BCM controls the headlamps based on the inputs explained above. When a low beam request is received, the BCM supplies B+ to the left and right headlamp control modules, which illuminate the low beam LEDs.

When the BCM commands the low beam headlamps ON, the operator will notice the interior backlighting for the instrument cluster and the various other switches dim to the level of brightness selected by the instrument panel dimmer switch.

No parts are serviceable within the headlamp assemblies so complete headlamp assembly replacement is necessary.