High Beams (Envoy and Diamond Edition W/HID)

Battery positive voltage to the headlamp switch is supplied by the HDLP SW fuse in the IP fuse block. When the headlamp switch is in the HDLP position, a voltage signal is sent to the Body Control Module (BCM) signaling that the headlamp switch is activated. When the headlamp switch is in the AUTO or PARK position and the ambient light sensor detects darkness the BCM switches to the ALC mode. Battery positive voltage to the high beam relay is available at all times from the HI BEAM fuse in the underhood fuse block. The high beam relay coil voltage is supplied by the BCM based on the headlamp switch, ambient light sensor and multifunction headlamp dimmer switch status. When the high beam relay coil is grounded by the multifunction headlamp dimmer switch in the high beams position to G200, the relay supplies battery voltage to the LH HI and RH HI fuses in the underhood fuse block. The high beam relay can also be activated by the BCM at any time if the BCM receives a voltage signal input from the multifunction headlamp dimmer switch when the momentary flash to pass function is activated. The LH high beam headlamp receives battery positive voltage directly from the LH HI fuse and is grounded at G111. The RH high beam headlamp receives battery positive voltage directly from the RH HI fuse. The DRL relay coil is supplied voltage by the IGN E fuse in the underhood fuse block. When the headlamp switch is in the AUTO position with the ambient light sensor detecting darkness or if the headlamp switch is in the HEAD position, the BCM removes the ground path to the DRL relay coil. This completes the ground circuit for the RH high beam headlamp through the normally closed contacts of the DRL relay to G102.