96 Silverado DRL not working

[Mike Copeland]

Headlights work normally. DRL dash indicator works but DRL do not come on anymore. Fuse is good. Cannot find relay. Is there also a diode? Where is it?

Thanx
Mike

[skipr]

The DRL operation is automatic, provided that the Ignition Switch is in the RUN, BULB TEST or START position, the Parking Brake is disengaged and the Headlamp and Panel Dimmer Switch is in OFF. When DRL is operating, the LOW Beam Headlamps are on.

Voltage is supplied through the GAUGES FUSE 4 when the Ignition Switch is in the RUN, BULB TEST or START position to the DRL Module and to the Coil (power side) of the DRL Relay. If the Parking Brake is disengaged and the Headlamp and Panel Dimmer Switch is in the OFF position, then the DRL Module supplies ground to the Coil (ground side) of the DRL Relay. With both power and ground applied to the Coil of the DRL Relay, it energizes, and the contacts close. Voltage is applied through the DRL-FOG FUSE 15 and the closed contacts of the DRL Relay to the LH and RH LOW Beam Headlamps. When DRL is operating, the DRL Module will also supply ground to the DRL indicator. Voltage is applied through the GAUGES FUSE 4 with the Ignition Switch in the RUN, BULB TEST or START position to the DRL indicator. With both power and ground applied to the DRL indicator, it lights. If the Parking Brake is engaged, a ground signal is sensed at the DRL Module. When the DRL Module receives this signal, it disables DRL operation by removing ground from the Coil of the DRL Relay. The DRL Module will also disable DRL operation if the Headlamp and Panel Dimmer Switch is ON or the Ignition Switch is turned to the OFF, LOCK or ACCY positions (also, by removing the ground from the coil of the DRL Relay).

[Mike Copeland]

That is helpful. I can tell that my DRL module is ok because the indicator still lights up. I understand there is a diode in the circuit. That may have opened. Where is it located?

[skipr]

Originally Posted by Mike Copeland

That is helpful. I can tell that my DRL module is ok because the indicator still lights up. I understand there is a diode in the circuit. That may have opened. Where is it located?

Ok there is a orange wire coming off of FUSE 15 (interior fuse panel), then the diode, after the diode output the wire turns yellow, and then into the convience center (where the relay is, under the steering wheel tto the left, kinda above the parking brake ) I dont know exactly whre the diode is, but there is only a foot or so between the fuse block and convience center. I never had to look at mine.

[Mike Copeland]

Thx, I will be spend some quality upside down time. Having the wire colors will help a lot. It sounds like I am looking for a device that has a yellow wire on one end and an orange wire on the other end. I will post more when I find it.

Thanx again