High Beam Operation

Voltage to the headlamp switch is available at all times from the HDLP SW fuse 7 through CKT 1940 (ORN). When the headlamp switch is turned to the HDLP position, the headlamp power relay coil is energized through CKT 352 (WHT). A signal is also sent to the body control module (BCM) that the headlamp switch is ON. The relay coil is grounded through terminal F7 connector 2 of the UBEC to CKT 350 (BLK) to G102. When the headlamp power relay is energized the relay supplies power to the LT HDLP and RT HDLP fuses. The RH high beam headlamp receives current through CKT 198 (DK BLU) from the RT HDLP fuse. When the headlamp switch is in the HDLP position, the BCM removes the ground path to the relay coils of the headlamp grounding relay and the DRL relay. Both relays return to the normally open position. The normally open contacts of the DRL relay allows current to the LH high beam headlamp through CKT 711 (DK GRN/WHT). Both high beam headlamps are grounded by CKT 524 (PPL) through the UBEC to the multifunction switch (high position) contacts through CKT 10 (YEL) to the headlamp grounding relay in the body relay block through the normally closed contacts to CKT 1850 (BLK) to G200. A voltage signal is sent to the BCM through CKT 524 (PPL) in order to confirm high beam operation.