High Beam Circuit Not Working

[coker6365]

2015 Denali. High beam circuit quit lastnight. Schematic shows the high beam relay being part of the printed circuit board on the fuse block and not servicable. I am assuming the BCM is working properly since the dash indicator is illuminating. No power at the 3 prong fuse (location 58). Anyone ran into this?

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[2004LB7]

I haven't seen any fail but I did take apart the fuse block on mine and noticed the circuit board inside that had the high beam connection. I want to say it was a mosfet or similar. Maybe all you have is a burned trace and can soldier a jumper wire across it

 

[Chevy1925]

Did you cut a wire when you put that engine back in or pulling one out of a socket somewhere?

 

[KyleC4]

The dash indicator for high beam is separate from high beam circuit. It’s wired to high beam switch as for signal to be commanded on. And then BCM just tells IPC to illuminate that indicator. I guess you can rule out your BCM being bad by back probing the control circuit for high beam. It’s connector X5 out of BCM. It is brown colored. Circuit color is brown and violet tracer. So if you looked at connector and pin 18 it’s the 2nd row from bottom and 3rd in from right.

 

[coker6365]

All good guys. Found the issue. The pins on the printed circuit board that makes contact with the fuse are not healthy. Used a needle and fluke to find voltage. Tried bending the tabs back in place but the board will have to come completely out to fix. So for now its shimmed to make contact and works fine. Is what is is. Lol

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