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Pontiac Montana Electrical Issues

ksixksix Posts: 2
The interior lights will "not" go off when I shut the doors. The only way I can turn them off is to use the over-ride switch on the overhead console. I did check the BCM PRGRM and it is set on program three (three tones). I there a multi function module that needs replaced?


  • ksixksix Posts: 2
    This is my first time posting a message. Sorry I forget to give the make & model. 1999 Chevy Venture LS with 150 miles
  • seppyseppy Posts: 2
    some wierd things going on with our 2001 montana, first: when in park engine on step on brake pedal the left and right turn signals light up very dim, second: signals work fine until i step on the brake pedal the left only ticks faster and the TCS lights up on dash. third: when i put it in reverse left side reverse light does not light as strong as right side and also left and right indicators on dash light up dim. ive checked all bulbs and filaments. signal switch?? or brake light switch?? please help!!
  • You have a ground problem.
    Take off you rear right tail light assembly.
    Remove the PC Board from the light housing.
    Use care to not break the plastick clips when remoing the PC board.
    Disconnect the PC Baord that holds the bulbs from the wiring connector.
    Look at the connector on the PC Board. The middle one is black, corroded and the black plastic is partially melted.
    Look at the connector end.
    The connector is melted around that plug location and the connector is also black and corroded.
    Use a small flat blade screw driver to clean the pin connection on the PC Board side.
    Go to the junk yard and cut out a couple of these wire harnesses for the plug. Cut off about 6" of wire with the plug. Use a wire crimp tool to replace the plug. Be sure to wire it exactly as the one you remove.
    If you forget how, look at the left side light.
    I believe this is seen only on the rear right due to the exhausts location on that side and the fact that GM trys to save a nicle by using too small of a ground connector causing it to over heat.
  • When I said cut off about 6" of wire, Imean on the junk yard car. Cut your car's plug off next to the plug.

    Good Luck.
  • seppyseppy Posts: 2
    thank-you very much for the info
  • I need key codes!!!!!!!!!!!1 I lost my keys, and the keys I made at Walmart wont start it!! The dealership wants me to pay over $200. HELP!!!!!!!!!!!1
  • 2000 Montana, when I hit the brakes the horn blows. Is it possible that these wires are somewhere connected?
  • Hi, I have a 2000 Pontiac Montana with the same problem. My interior light comes on when I turn on the rear defrost, brake lights or turn signals. They stay on until I use the overide switch. I'm hoping its not the Body control module but I got a bad feeling. I think these are related and mebe someone solved it. THX
  • pmedic29pmedic29 Posts: 1
    I have a 1999 montana with approx 145k miles. Recently it began having power problems at highway speeds. It appears to cut out like an injector is failing but if you give it more gas the problem goes away. It is a jerky feeling. Not sure if it is an injector, the transmission or what. Any ideas? I have no engine lights on at all. Please help... need more info? just ask....
  • You should check your ignition wires and ignition coil packs. Sometimes the sparkplugs. Usually the coils or wires will miss on the highway at lower cruise speed/rpm 80-110kph) and if you accelerate it dissappears. (engine runs leaner which has less fuel so the power required for spark is the highest) The wires can be visually checked, checked for resistance or you can spray a water mist on them and lookf for sparks or miss. Coil parks are tougher to diagnosis better left to experts(hard to reach too). Good Luck.
  • I have a 2001 Montana with 63,000 miles. Recently we have begun to have problems with the fuel gauge. The gauge reads fine with the tank full, down through say half-tank. Below that its totally not accurate. At some point you will notice that the needle is all over the place. When its starts this "bouncing" the tank is getting pretty close to empty. I'm worried that me not so observant wife is going to run the thing out of gas (I put 22.7 gallons in tonight). I have had fuel gauge problems in other vehicles before and its usually been related to a bad ground. Any idea where to look for the sender ground?

    Sorry for the wordy post. Any help would be appreciated.

  • I had the same problem....very common with this vehicle! It was a short in the rear light connector for the brake light / tail light / turn signal fixture. The GM supplier used a plastic connector that would not withstand the heat, so it started to melt, and the black power wire shorted out other wires. It can also cause electrical feedback problems with ABS and Traction Control System false error warnings. You will need to cut out the connector and replace it with a new one....about $55 for the part at the mega bucks in labor. I did it myself.
    Jack Hirneisen
  • I have a 1999 Pontiac Montana mini-van with a burned out power window motor on the passenger side. I purchased a new window motor and tested it with a 12-volt power source before I installed runs properly for both forward (up) and reverse (down) motions. The motor has two male prongs...the down-motion male prong goes into the brown wire side of the female plug connector, the up-motion male prong goes into the blue wire side of the female plug connector. The motor sits in a plastic plug that does not have a ground. We think that the brown and blue wires act as alternating power / ground, i.e, brown as power and blue as ground (to lower the window), then blue for power and brown as ground (to raise the window). I then plugged the motor into the female plug from the up/down window control switch. Using the window control switches, I tried to lower the window or raise the does not work. Note that the drivers side window switch for the drivers side window works fine, so I doubt that it's a fuse or circuit breaker problem. We ran some more tests; ....down motion via jumpering the brown male motor prong to the brown wire on the female plug, and a ground wire on the blue male motor prong, and depressed the window switch worked properly. Doing the same test on the up switch with the blue wire did not work. So the switch's down motion works, but the switch's up motion does not work. Through several tests we found that the brown female wire was providing power, but the blue wire is not providing power and is not a good ground.
    Here are some possibilities: when the original motor burned out, the window switch circuit board up-function might have fried. I'll check the circuit board for any visual signs damage. Another possibility is the blue wire is broken....which is going to be tough to find.
    I'm trying to find a wiring diagram, but no luck so far.
    Has anyone had similar problems with this vehicle (or Olds Sillouette or Chevy Lumina APV)?
    Any suggestions?
    Many thanks,
    Jack Hirneisen
  • I think I found the problem.....when the right front power window motor shorted out, it fried the right window up/down switch. I finally found the problem with help of a wiring diagram...obtained by my friend from (a pay for use site) and I ran about 25 different tests.
    Jack in Colorado
  • If you want to view a summary of the Recalls and Technical Service Bulletins (TSBs) for your vehicle, go to:
    Then on the right margin it will ask; "Choose Car Year". Enter the year, i.e. 1999.
    It will then come back asking for model, etc.
    I entered mine; a 1999 Pontiac Montana 3.4 Litre V-6.
    I got 3 Recalls and 148 TSBs. Click on:
    to see my results. That's about all you get for free. You will need to subscribe to their service for more detailed info, or find a friend that subscribes.
    Good luck.
    Jack in Colorado
  • Hello, I just bought a 99 Pontiac transport Montana that has most of the bells and whistles.It has 241,000kms on it.
    3 problems. 1. when I first bought it the gas gauge would go to full and as i drove it a few blocks it would fall to empty. At Cdn Tire they told me to put an additive (Valvoline) in the gas tank, now the gauge went to full and stayed there, no more movement. the vehicle had been sitting idle since last fall.
    2. the rear door refuses to open with either the flicker or the hard key, it clicks but won't open.
    3. Also the clock doesn't lit up and the volume control doesn't operate as it should.
    Any ideas???
  • For the gas gauge.....might be a bad gas gauge sending unit which is in the gas tank. GM had lots of problems with this part which was supplied by an outside vender. They issued a TSB on it, but you probably have too many miles on your vehicle to qualify for a free replacement.
    Jack in Colorado
  • Hi Jack
    Thanks for the response. Briefly, yesterday the led lit up on my radio, after I switched off the ignition and restarted, it wouldn't lit up again. As far as the rear latch and the gas gauge are concerned, when we buy vehicles in Ontario, they have to be safetied and these two items are part of the package so I'll go back to the dealer I bought it from for correction. I was hoping to find someone who had first hand knowledge of these two problems to save time, hope the mechanic knows.
  • mlkuttermlkutter Posts: 4
    Having problems with the passenger automatic sliding door on my 2000.
    Gets stuck often to the point that we don't use that side anymore.
    Any suggestions?
  • mlkuttermlkutter Posts: 4
    Having the same problem here.
    Have you heard anything back?
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