Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Welcome. If I may, can we so some diagnosis first? If so, then lets start at one of the headlight assemblies. Take it out and use a section of wire to ground the dark blue for low and pink for high beam. If they come on, then we need to go next to the base of the steering column where these wires go into the dimmer switch and test them there. Also does the Flash to pass work?
OK, then we need to look at something else because the headlight relay only controls the regular lights and the flash to pass is not included in the operation of the relay. The relay is in the left dash fuse block. To be sure, see if it clicks when you turn the lights on. YOu need only remove the end cap of the dash to get at it.
You can reply and I will assist as I can. The morning I am around but after lunch I will be offline as I have to take my son for some tests in the city.
I have a suspicion there is a fault in the dimmer switch in the steering column as the flash to pass does not work, or a fault in the wiring, and possibly even a bad BCM, but again that does not have anything to do with the flash to pass part.