High Beam Headlamps (T4L)

When the low beam headlamps are ON and the turn signal/multifunction switch is placed in the high beam position, ground is applied to the BCM through the high beam signal circuit. The BCM responds to the high beam request by applying ground to the high beam relay control circuit which energizes the high beam relay. With the high beam relay energized, the switch contacts close allowing battery voltage to flow through the left and right high beam fuses to the high beam control circuits and on to the left and right headlamp control modules within the headlamp assemblies. When supplied with battery voltage, the left and right headlamp control modules will illuminate the high beam LEDs.

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