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 battery positive voltage from the high beam headlamp control circuit to the left and right headlamp control modules located in each headlamp assembly illuminating the LED high beam headlamps.