GM Service Manual Online
For 1990-2009 cars only

Headlights Circuit Description Non VE1

Voltage is available to the headlamp and panel dimmer switch at all times. The headlamp and panel dimmer switch includes a self-resetting circuit breaker. The circuit breaker opens when the headlamp and panel dimmer switch draws too much current. When the circuit breaker opens, the current flow interrupts. The circuit breaker cools off and resets automatically.

The headlamp dimmer switch directs the voltage to either the low beam headlamps or the high beam headlamps, depending on the headlamp dimmer switch position. When the headlamp and panel dimmer switch is in the HEAD position the daytime running lamps (DRL) module receives a headlamps ON signal. The DRL operation disables when the DRL module receives the signal when the ignition is in the following positions:

    • RUN
    • BULB
    • TEST
    • START

Voltage applies through the closed contacts of the headlamp and panel dimmer switch and the headlamp dimmer switch to the left side and the right side low beam headlamps when the following conditions exist:

    • The headlamp and panel dimmer switch is in the HEAD position.
    • The headlamp dimmer switch is in the LO position.

The G100 supplies the ground to the right side low beam headlamp and G101 for the left side low beam headlamp.

Voltage applies to the following components when the headlamp dimmer switch moves to the HI position with the headlamp and panel dimmer switch in the HEAD position:

    • The closed contacts of the headlamp and panel dimmer switch
    • The headlamp dimmer switch to the left side high beam headlamp
    • The right side high beam headlamp

The voltage applies to the high beam indicator and grounds through G110 when the headlamp dimmer switch is in the HI position. G100 supplies the ground for the right side headlamps. G101 supplies the ground to the left side headlamps.

Headlights Circuit Description VE1

Circuit Description

Headlamps

Voltage is supplied to the Headlamp and Panel Dimmer Switch at all times. The Headlamp Switch includes a Self-Resetting Circuit Breaker. The Circuit Breaker opens when the Headlamp circuit draws too much current. When the Circuit Breaker opens, it interrupts the current flow. With no current flow, the Circuit Breaker cools off and resets automatically. When the Headlamp Switch is in the HEAD position, the Headlamp Dimmer Switch directs voltage to either the Low Beams or High Beams. The High Beam indicator also receives voltage along with the High Beams.