Headlamps - Low Beam

Voltage to the headlamp switch is available at all times through the following components:
- The HDLP SWITCH fuse
- The CKT 1940 (ORN) wire

When the headlamp switch is turned to the HDLP position, the headlamp power relay coil is energized through CKT 352 (WHT). A signal is sent to the Body control module (BCM) that the headlamps are switched on. When the headlamp switch is in the AUTO position, a light sensor located in the right speaker grill senses one of the following conditions:
- Daylight
- Dark

The Body control module (BCM) controls the actuation of the following components for DRL operation during a daylight condition:
- The headlamp power relay
- The headlamp grounding relay
- The DRL relay

When the light sensor detects a dark condition, the BCM produces a signal that will energize only the headlight power relay, through CKT 350 (BLK) to ground G102.

The headlamp power relay supplies current to the following fuses:
- LT HDLP
- RT HDLP

The LH headlamp low beam bulb receives current through CKT 712 (YEL/BLK). The RH headlamp low beam bulb receives current through CKT 198 (DK BLU). Both headlamp low beam bulbs are grounded through the following components:
1. CKT 525(YEL)
2. The underhood fuse block
3. The multifunction switch (low position)
4. The Body relay block through CKT 10 (YEL) to the headlamp grounding relay

The headlamps ground relay and the DRL relay are deenergized by the Body control module (BCM). The BCM provides a ground path through the normally open contacts of the headlamps ground relay. The ground path is completed through the following components:
- Through the underhood fuse block
- To ground G102 through CKT 350 (BLK)