Question about 1999 GMC Yukon Denali

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99 Denali wiring from BCM

My 99 Denali is having multiple electrical issues. I have the dash lights come intermittently, such as brake, 4x4, ABS, security, engine, etc. I have no radio, clock, power windows, locks, wipers, sound, etc. I pulled the center console off and found the BCM. On the part labeled with "D E F" there is a grey or maybe brown thicker wire coming from it. When I push down on it everything works again and all dash lights go away. I thought it had too much tension and that was problem but now after 2 days of driving everything went out again. Do you think the wire/s just moved again? What else could it be? It seems when I turn the steering wheel to the left the power will go out. If I touch the wipers at all or the windows the power will go out. I do hear clicking where the fuse box is by the driver side door. Can you help me figure out the colors of the wires and what each one does? A picture of the inside of the console would really help too, if you think I can match them up and see what looks different. Thanks for your help!

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  • TCMakara Jun 21, 2013

    thank you! now im having trouble starting too...could this be the same cause?

  • Charday Tunley
    Charday Tunley Feb 04, 2014

    black or brown is ground red is negative I believe, you can check the gmc website for colors; did you pull a fuse, cause some cars if you pull a fuse sometimes they are connected to the whole car and you would have to get it programmed again at the dealer , my friend had to do that trying to get the door chime to stop and everything went off like yours?

  • Charday Tunley
    Charday Tunley Feb 04, 2014

    http://www.fixya.com/cars/t2270117-need_... some help

  • Charday Tunley
    Charday Tunley Feb 04, 2014

    Sounds like your computer is messing up, get that checked cause it could cause more problems driving it...

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  • GMC Master
  • 35,770 Answers

The BCM seems to be the source of some of the problems you mention. The red wire connected to terminal F is the power source. The BRN wire connected to terminal D supplies power to the ignition switch. The DK BLU wire connected to terminal C supplies power to the wiper and radio fuses and the power window circuit breaker which probably is the source of the clicking sound in the instrument panel fuse block. Normally, with the ignition switch in START or RUN position power is applied through GAUGES fuse 4 to the instruments (not dash lights) in the cluster. I believe replacement of the BCM will solve most of the problems you describe

Posted on Oct 31, 2012

Testimonial: "Thank you!! Now im having trouble starting...and the truck dying afyer its started. Does the bcm have anything to do with starting? "

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SOURCE: 99 yukon denali drivers side

The circuit board needs to be replaced. Which is the board that the bulbs sit in. If you remove the turn signal bulb. You will notice the bulb socket will be slightly burnt inside. I had the same problem with my 99 Denali and replaced the circuit board for $35.00. Now everything is fine.

Posted on Feb 02, 2011

Testimonial: "Thanks! That was the problem & my local Napa store had the part in stock and for that price."

  • 21 Answers

SOURCE: Brakes locking up

Similar problem on a Toyota truck. Turned out to be a combination of items.

Bad valve in the master cylinder.

Contaminated brake fluid.

Basically the heat in the rotors was boiling the brake fluid cause it to expand and lock up the brakes.

Not sure if the fluid contamination was caused by the master cylinder or the other way around. (it is the whole chicken or the egg argument.

My recommendation is start at the right rear wheel. Drain the fluid until it is at the bottom of the reservoir. refill with new fluid. Bleed the entire system. working your way around the truck from longest run to shortest. (Distance from master to the wheel)

Take your time and don't rush the job. After you have flushed and bled the system, go for a check ride. If the condition continues, you likely have the defective seal in the master cylinder.

Good luck, let me know if you need any other info.

Posted on Jun 01, 2009

johnjohn2
  • 5763 Answers

SOURCE: ABS Problem in my 2000 Jimmy 4x4

the best way to diagnose this problem would be with a scan tool while driving and watching the speed sensors, or check all your wheel tone rings make sure there are no cracks and they are clean, also have the computer scaned for abs codes there should be a code that may tell you which wheel speed sensor is acting up,you can also check the wiring, these seem to chaf the wiring by the control arm .a bad wheel bearing may also cause this problem, i would start with a scan of the abs system,good luck.

Posted on Feb 22, 2010

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