Join Date: Jul 2018
Location: St. Albert, Alberta, Canada
Ah, thanks...makes a bit more sense.
I ran 12V direct to the light bar and all 3 lit fine, so the bulbs are good.
Following backwards from the light bar connector....I have continuity to ground and to the fuse, so that wiring should be good. Fuse to relay, again good. So I'd say the issue is that the BCM isn't sending enough voltage to throw that relay. With all connected, I should hear that relay click with someone else pressing the brake, and I don't.
Voltage at the relay is varying with the interior lights, not the brake pedal, so something must be crossed up. I glanced at the BCM, 3 wiring harnesses connect on. Does anybody know which wires (and which harness) are brake switch signal in and CHMBL voltage out? I'm going to disconnect and reseat them now, see if there is any change or if I can see anything burnt out or such.
(If the brake switch has 2 separate signals, it could possiblly be that as well, though it wouldn't explain the voltage when you open the door.)
Thanks for the info thus far! I will get this sorted.....