1999 Gmc Yukon Electric help

BradyBargo · Friday at 7:53 PM

Good Evening everyone I have a 1999 gmc Yukon has a power drain over night things I’ve noticed
-Rear HVAC Fuse blows threw the night
Nothing is wrong with rear hvac blower motor everything is functioning correctly

-Power Door Lock, Six-Way Power Seat, Keyless Entry Module Breaker gets so hot can’t touch it in about a hour and seats stop working cause breaker gets hot and kicks out

Any help where to start at would be nice just purchased this thing would like to get everything fixed

When I purchased this thing I had to put a ecm on it got it from a same year Yukon and also had to put the passlock module in it to

blondie70 · Friday at 9:16 PM

Don't know what's wrong with it...but...I think I would be unhooking the battery at nite or whenever you leave it unattended. Do this until you get the problems resolved. Don't wanna burn that baby down !

GMCChevy · Saturday at 9:58 AM

Maybe there's a stuck or bad button somewhere causing something that module controls to work constantly. Or that module is bad?

BradyBargo · Saturday at 11:16 PM

blondie70 said:
Don't know what's wrong with it...but...I think I would be unhooking the battery at nite or whenever you leave it unattended. Do this until you get the problems resolved. Don't wanna burn that baby down !

Yeah that’s what I’ve been doing

BradyBargo · Saturday at 11:16 PM

GMCChevy said:
Maybe there's a stuck or bad button somewhere causing something that module controls to work constantly. Or that module is bad?

Just sucks trying to chase something like this down lol

exp500 · 2024-12-22T12:50:59-0500

If you are drawing anything over about 100 Ma you should be able to find the circuit by removing fuse or relay for the draw. Use the test points on top of fuses to make test easier. Circuit dagrams in manual.
If you have a short or failed component, it is possible/probable for a backfeed of power connecting more than one fused system or component.
When you get to the point that you can stop the draw by removing fuse or relay, or at least know which power lead it is on then repair is pretty much follow the wires.
Report back here with findings and many folks will step up with helpful suggestions.

look here- https://www.gmt400.com/threads/88-95-service-manuals.43575/

NoReverseYukon · 2024-12-22T13:07:45-0500

Just by knowing how much dog hair, dirt, et cetera collects under my front seats, I would start with taking a look under yours. There might be stuff under there causing an intermittent short.

BradyBargo · 2024-12-22T21:19:34-0500

NoReverseYukon said:
Just by knowing how much dog hair, dirt, et cetera collects under my front seats, I would start with taking a look under yours. There might be stuff under there causing an intermittent short.

Checked under them from what I seen everything looked great and the passenger seat don’t work at all don’t know why none of the functions, so I maybe thought that is what was keeping the 30amp breaker hot so I unplugged the seat made no difference don’t know why the seat doesn’t work no way all the motors on it failed at one time

1999 Gmc Yukon Electric help

BradyBargo

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BradyBargo

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