With Daytime Running Light

With the Ignition Switch in RUN, the Light Switch not in HEAD and the Park Brake released, the Daytime Running Lights (DRL) Module grounds the coil of the DRL Relay. The relay is energized, and battery voltage is applied to the Fog Lights through the contacts of the DRL Relay. The Fog Lights operate at full brilliance for the DRL mode operation.

When the Light Switch is in HEAD and the Headlight Dimmer Switch is in LO, battery voltage is applied to the Light Switch Input of the DRL Module via CKT 10. The Module de-energizes the DRL Relay, turning off the Fog Lights. Battery voltage is applied to the LO Beam Headlights via CKT 12

When the Light Switch is in HEAD and the Headlight Dimmer Switch is in HI, battery voltage is applied to the HI Beam Input of the DRL Module via CKT 11. The Module de-energizes the DRL Relay, turning off the Fog Lights. The Module also supplies voltage to the HI Beam Indicator via CKT 629. Battery voltage is applied to the HI Beam Headlights via CKT 11.

With the Light Switch in PARK or HEAD, battery voltage is applied to the Fog Light Switch. With the LO Beam Headlights on and the Fog Light Switch ON, battery voltage is applied to the coil of the Fog Light Relay. The Fog Light Relay coil receives its ground signal through the DRL Module. The relay is energized, and voltage from the FOG Fuse is applied to the Fog Lights through the Fog Light Relay contacts. If the HI Beam Headlights are turned on, battery voltage is applied to the HI Beam Input of the DRL Module. The DRL Module removes ground from the Fog Light Relay, and the relay is de-energizes, removing battery voltage from the Fog Lights.