Headlights

The headlights are controlled by the body control module (BCM) via the AHL Relay when the headlamp and panel dimmer switch is the AUTO position. When in the AUTO mode, the BCM receives a signal, (voltage) from the ambient light sensor, based on the voltage on the sensor the BCM turns the day time running lamp (DRL) lights OFF and the headlights ON. The headlights can also be turned on by placing the headlamp and panel dimmer switch in the head position.

The relay coil is fed by the headlamp and panel dimmer switch or the BCM and the battery B+ buss bar in the engine wiring harness junction block. The BCM supplies current to the relay based on the input from the ambient light sensor via CKT 352. The relay output feeds the LT HDLP and RT HDLP fuses to supply current to the low and high beam lamps on CKT 1340 and CKT 1240. The ground for both the low and high beam lamps is supplied via CKT 524 and CKT 525 to the dimmer switch. The dimmer switch uses CKT 1850 for a ground to G203. Some circuits are monitored by the BCM, and upon failure may set a DTC.

NOTE: (For US application only, Prohibited in Canada (RPO Z49)) You may, for the current ignition on cycle, turn off the DRL and the Automatic Headlamp (AHL) feature by 101 lowing the steps below:

1. The ignition is in the Run position.
2. Press the dome lamp defeat switch 4 times. After the 4th press of the switch the chime will sound informing you the procedure is complete. Turning the ignition off and then on will place the DRL and AHL back in the automatic mode. This does not apply to some early built pickups.

For a description of the RPO Code(s) shown in this article refer to the RPO Code List found at Vehicle/Application ID RPO Codes