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Pontiac Montana Electrical Issues

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  • I had the same problem on my montana. there is a wiring harness on the passenger side front floorboard under the carpet where th e floor board curves down from the firewall to the floor pan they made a 2 piece wiring harness and patched them together . They seem to corrode at these patch points causing a number of electrical issues. I just trimmed the bad part of the wires off and used crimp heat shrink patch connectors from walmart and electrical heat shrink tubing to fix. Plus rear tailight socket issues cause a wide variety of electrical issues too. I hope this helps before you spend alot of money on switches. I have baught alot of parts on ebay that are greatly discounted without fail. Just do not but from people or dealers from outside the us.

    Good Luck!
  • I have a 2000 Pontiac Montana van and the last couple of months I have had nothing but problems with my brake lights. i have replaced the bulbs so many times and getting sick and tired of it. The lights will usually work for a day or two once new ones are in and then they blow or just don't work. There is never a problem with the brake light in the center above the back door though.
  • This is a common problem with this vehicle....see many, many, previous posts about this. It's the bulb socket...the black wire is shorting out with the colored wires due to a substandard plug material that cannot take the heat....it melts.
    Replace the plug (pig-tail) with a new kit...about $40 plus your labor...use crimp connectors.
    Jack
  • Where can I get this part? Do I need to go to a dealer and order it? I went to an Advanced Auto store today and they had no idea what it was I was wanting and said they couldnt get anything like that ordered,
  • At Dealer.
    Jack
  • How long can the battery remain discnnected without affecting the memory?
    Larrym13
  • I hope I didn't screw my van up too badly. I have the same burnt tail light plug plug issue on a 2001 montana. I tried to file and clean the connections, and I may have either loosened or corrupted the groung on the plug. Now the van won't start. It sounds like the starter is "grinding" but not even trying to turn over. Is this possibly because the assembly is no longer grounded? I kind of freaked and went ahead and cut the ground wire going into the plug assembly, so now I know its not grounded - and not starting.
  • ronkeyronkey Posts: 11
    The tail light does not have anything to do with the starting system.Make sure the battery connections are clean,and tight,Be sure the battery voltage is good,you may have to charge the battery.Or it may be a bad starter.Have the battery checked out to make sure,but try charging it,and see if the engine will turn over,I am assuming the engine is not turning with the starter,.
  • ronkeyronkey Posts: 11
    It is possible the door jam switch is the problem.
  • ronkeyronkey Posts: 11
    Check all fuses,and if they seem to be all good,replace the body control module,
  • It looks like it is the starter. I will check the rear tail light plugs to be safe but it has become a regular occurence to have electrical faults when the van is started with the remote. They go away with a shut off and re-start.
  • ron1977ron1977 Posts: 1
    my 2003 pontiac montana's power door locks are locking and unlocking by them selfs. can anyone tell what the problem is PLEASE? it's driving my wife and myself crazy lol.
  • smu2002smu2002 Posts: 2
    I have replaced the alternator twice in the past two months and am now having issues again. The battery has also been replaced. Not always, but sometimes when I turn the key nothing. The lights come on but the van will not turnover. If I boost it the van starts fine and then slowly loses it power until it dies again. I am thinking that it has to be something else at this point. Perhaps a short or something that is killing the alternator. Very odd. I took it to the dealer and they told me the alternator is bad. Thoughts?
  • ralowthralowth Posts: 1
    Hello all,

    I have a 1999 Pontiac Montana, that is currently saying its overheating, after many weeks of replacing things and searching we finally figured out that my fans are not always turning on. Some days they wont even turn on at all, we are almost 100% sure that this is the soul problem now, we have replaced the relays and it still has not helped the problem, I was wondering if anyone knew how to run a switch to bypass the relays into the inside so I would be able to turn on the fans manually?

    The vehicle DOES NOT overheat while driving at a constant speed, just in stop-and-go traffic. When the fans turn on, the vehicle IMMEDIATELY cools off, so when air is going into the engine it cools itself off. When I first turn the engine on, it takes about 20 minutes of idling for it to get to the red-line overheat area. If the fan comes on, it will cool off tremendously, leading me to believe that the problem is simply no air getting to the engine.

    Any ideas how to safely wire a switch or some contraption to make the fans turn on manually? Also, that would be a good way to test the fans and see whether or not they are even good themselves anymore.

    EDIT: Also, SOMETIMES the fans will turn on when I turn the A/C on, but that is also sporadic. I tried the "disconnect the coolant temp sensor" trick I read to get the fans to turn on, that didn't work.
    Read more at http://www.pontiacforum.com/pontiac/showthread.php?t=24586&kcplink=1
  • ptrent2ptrent2 Posts: 4
    have the mechanic check your cylinder heads. I had the same issue and found out that the original owner's mechanic did not flush out all the Dex cool antifreeze and it ate away at the cylinder heads. After they assessed the situation i did not have any more problems.
  • haluskahaluska Posts: 1
    I have had the same problem with my 2005!

    Sometimes I'll turn the key to start the car and I won't get anything. No starter, no clicks, no nothing. The only that happens is everything electrical turns on. I'll have to let it sit for awhile (maybe 5 - 10 minutes) and then it will usually start right up like nothing was wrong.

    I think I can even hear my fuel pump or maybe some switch associated with the 120v adapter clicking away along with the interior lights being on.

    Any ideas? Thanks!
  • smu2002smu2002 Posts: 2
    In follow up, I am not sure if this helps but a GM tech told me that these vans are known to have starter issues. More specifically, he said that there is a wire that runs from the one part of the starter to another and that it has had corrosion issue. Replacing the starter would help. So with that I replaced the starter and have not had the problem happen again (knock on wood). That was about a month ago and all is good. What he said all makes sense to me now, form if the wire had a partial short in it it would explain why it was both sporadic and would start with more juice (boost).

    Hope this helps.
  • My 2003 Pontiac Montana's front wipers move very slowly (when they move) and will stay in the full up position, and then over a period of time move back to the close or home position. My first thought is the motor is going bad, but after reading some of the postings, I'm not so sure and think there may be something else causing the problem. This occurs on the mist, any of the delayed settings, as well as low and high. Any thoughts?
  • mcrrtmcrrt Posts: 88
    We had a similar problem with the rear wiper on our Chevy Venture (same as Montana). Over time, moisture and "crud" had worked it's way into the wiper's motor shaft and caused it to seize up.

    Try spraying the wiper shafts with WD-40, then turn the wipers on an intermittent setting. When the wipers start to cycle, use your hand to gently "help" the wipers move back and forth; this will work the WD-40 down the shafts and get them lubricated. You will probably have to repeat this procedure (spray the shafts, "help" the wipers move) several times before they resume working the way they should.

    Hope this helps! ;)
  • montana06montana06 Posts: 1
    I have a 2006 Pontiac Montana SV6. Same exact thing happened to me. You need a NEW wiper arm mechanism (~$200.00). Apparently some oxidation occurs and causes the wipers to not move at all! We tried replacing the motor but that was not the problem. We bought the part from our local dealer and installed it ourselves. The hardest part is getting the mechanism out. Once it is out replacing it is a breeze! After we replaced mine, I could not BELIEVE how well they worked. We could have spent over $1,000 with trial and error @ the dealership, did some research and figured out the problem. Now we need to replace the rear wiper! Good luck to you!
  • cleokcleok Posts: 3
    2002 Montana. Any idea why fan not work on position 5. Should be full 12volts. I checked fuse and want to get to switch. cannot figure out how to get plastic frame off around control center. It's loose but something on each side is holding.
  • My 2000 Montana was bought used and the fan had only 3 speeds. I had the dealer fix it by changing the fan control and later I was told that this was due to the Cabin Air Filter being too dirty. Indeed it was clogged and what I was told that this will cause excessive heat build-up on the fan control switch. There is 2 screws that hold the (temp/radio and storage/cup holder) cover that is right behind the cup holder (pull on the cup holder and you will see it.) I have mine out now as like most other Montana owners, my Delco radio has burned out 2 of 3 lights behind the display. I did this job myself but it is tricky..A lot of good info I found on the net.
    Good luck
  • cleokcleok Posts: 3
    Thanks for your input. I had taken out two screws and it is loose but seems to have a tab or something on each side, still holding. Was wondering if more covers (to the sides) need to be removed ? And if that is even going to get me where I need to get. I saw a post that said the fan speed module was above the pasengers feet.
    Did you fix the display on your radio ? Mine has a couple lights out too. I didn't know what that involves but could probably do it. I repaired car radios thru the 70's & 80's for a living.
  • Hi Sorry I just noticed that there is 2 more screws behind and above the cupholder. I was not able to figure out how to remove the cupholder but I was able to go in on the side of the cupholder and remove these last 2 pesky screws,

    I replaced the lights with Radio Shack =The Source (Canada) with these lights

    http://www.radioshack.com/product/index.jsp?productId=2102815&cp=2032058.2032232- .2032295&parentPage=family

    It was not easy to do and took me a couple of hours. I used a 40 watt pencil type soldering iron and a medical Magnification light with adjustable arm.
    Please,please change all 3 at the same time as I changed 2 and the 3rd. burn't hours after.

    Let me know how it goes!
  • Sorry I should have added this post on the procedure to replace the Radio Display lights.

    http://www.automotiveforums.com/vbulletin/showthread.php?t=446329
  • doxz614doxz614 Posts: 1
    Strange One. My Montana Remote does not work for Locks. The switch on either the Drivers Side or the Passenger Side will not Lock the doors, but will Unlock all doors. If I use the key in the door it will Lock and Unlock all doors. ???
  • cleokcleok Posts: 3
    Did the remote ever work for you. Is it original. The switches commonly go bad. Mine (2002) will lock doors but not unlock them.
  • help69help69 Posts: 3
    edited September 2011
    i had this problem on my 99 montana. i drove it up a steep bank. got the radiator cap the highest point of the cooling system filled it up and never had a problem again.it took awhile to get all the air out but it sure made a difference. for wiring diagrams go to badgerlink.net have your library card number and it posts a lot of them for different cars.
  • my sliding door would not work. on the driver side under the carpet the wiring goes thru there. the orange one was the door.water gets in there.works just fine,
  • there is a about five or six places that water will get in these Montana's.I seen a post about them . i would guess that your problem is moisture.
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