First Post Seat belt dash light issue

[vetmph]

My seat belt buzzer works fine in my 1987 GMC it goes off when the seat belt is fastened but the dash light does not go off. My temporary solution is to remove the bulb form the panel but I would like the system to work. The key and headlight buzzer works as well it is just the light won’t go off for the seat belt and also the light for the parking brake won’t go off either. I know they are separate circuits but wondering if it could be an issue on the dash circuit board?

 

[Jgonick]

The parking light comes on when tan-33 wire (going to circuit board) is grounded. It can ground at one of two locations. It is grounded by the switch at the parking brake & brake proportioning valve (usually on frame under radiator) - Make sure the tan wire isn't grounding out at those locations or on it's way there.


I believe the seat belt light illuminates when yellow-237 wire is given power by the alarm module. On an 87, that wire should come from the convenience center and head to the circuit panel. Not sure why it would remain on, maybe a bad alarm (buzzer) module- You could pull out the module and see if the light goes out.

Attachments show where the parking brake switch is & what the proportioning valve will basically look like.