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Old 09-22-2009, 10:29 AM   #1
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2000 GMC savana van headlight problem


Hey guys, looks like its my turn to ask for advise. My work truck is giving me trouble lately. seems the the low beams won't comeon some times. that includes the daytime running lights. sometimes they work other time they don't. The days will be getting shorter and i will be needing them hehe. the other day i noticed that the DTRL didn't come one so i turned the headlights on then off and they came on, That usually doesn't work. Any ideas? a relay under the hood someplace? would thr DTRL module do this?
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Old 10-11-2009, 10:53 PM   #2
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2000 GMC savana van headlight problem


I did some looking around and have found the same problem on other GM vehicles and they are saying its the Multi function switch. now none of the things on the internet has been a savana van but same problem. anyone think this could be it?
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Last edited by plumber Jim; 10-11-2009 at 11:04 PM.
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Old 10-11-2009, 11:15 PM   #3
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2000 GMC savana van headlight problem


not sure what the multi function switch is but i had similar problems on my 94 gmc truck . turned out it was the high beem switch on the steering column .. the low beem switch goes" wired "through the high beem switch . when you hit the high beems the switch shuts off the low beems . not sure if its the same on your model though just throwing it out there. maybe thats what they are refering to the multi function switch.
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Old 10-11-2009, 11:37 PM   #4
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2000 GMC savana van headlight problem


Usually the turn signal stalk conrtols high beams, turn signals, cruise control if equipped and also the windshield washer squirters. The headlight circut does not run thru this switch, and I have yet to see any loss of regular low beams as a result of the multifunction switch (Stalk).

Some models have the option to turn of the DRL (Daytime running lights) and on a Ford its called "Twilight". Newer vehicles and cars in Canada require the lights to be on even during the day.

When you notice the problem, is it limited only to the headlights? What I mean is do the dash lights, tail running lights and front marker lights still come on?

If none of the dash lights, tail lights or marker lights come on, then I would be leaning twards the main headlight switch, however if your multifunction switch has taken quite a few knee's and is loose, it could be causing a short in the headlight circut, but again VERY VERY RARE, I usually only replace the multifunction switch for Turn Signal, Cruise and Washer complaints, as these are the only circuts inside the stalk itself.
The stalk only pushes a lever down in the column, which in turn trips a switch. This switch is not even part of the multifuction switch (stalk). I really doubt its the multi-function stalk.

Ill try and dig up some photos.
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Old 10-11-2009, 11:48 PM   #5
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2000 GMC savana van headlight problem


They have changed since the 80's and 90's a little bit. Likley to allow room for the SRS (Air bag) system.



I am seeing a re-call for the same year Jimmy stating that this unit will short out causing the brake and tail running lights to go out, however nothing about the headlights.

May just be the main switch, however that will usually keep all the lights from coming on as well.
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Old 10-11-2009, 11:53 PM   #6
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2000 GMC savana van headlight problem




Seems they want $66 bucks for the switch.

http://www.autopartswarehouse.com/de...85c7ab9e&gan=1

It appears that on the newer models with air bags you can no longer just buy the "Stalk" seperate from the switch. When I said the headlight circut does not run thru the stalk, I meant that the actual switch that toggles the high beams is not part of the stalk itself, rather a remote switch actuated by the lever. On your vehicle the stalk and switch are sold together, but I would seriously be sure thats the problem, as they likley want and arm and a leg for it.

Last edited by SELLC; 10-12-2009 at 12:00 AM.
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Old 10-12-2009, 01:07 AM   #7
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2000 GMC savana van headlight problem


The actual switch i was refering to" high beem" is located on the steering column itself under the dash there is a wireharness that plugs into it . the switch you mention below does not have wires running through it but it does have a rod attached that goes to the actual high neem switch so no that switch you mention would not cause the problem. it activates the highbeems switch with a rod not wires like you say. like i said just throwing it out there as it might not apply to this particular model.
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Usually the turn signal stalk conrtols high beams, turn signals, cruise control if equipped and also the windshield washer squirters. The headlight circut does not run thru this switch, and I have yet to see any loss of regular low beams as a result of the multifunction switch (Stalk).
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Old 10-12-2009, 08:54 PM   #8
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2000 GMC savana van headlight problem


No worries oldriver, I too thought he had the older style when I first replied. It wasnt till I seen the photo that I realized his was the newer Air Bag equipped model.
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Old 10-12-2009, 09:13 PM   #9
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2000 GMC savana van headlight problem


Interesting thread. I have a 2001 GMC Savannah with the exact same issue. The dealer "couldn't see the problem" when it was under warranty, but now they seem to know exactly what's wrong.

PS Jim, do you ever hear a "clicking sound" from behind the speedometer when you are starting or turning off the truck?

Last edited by rselectric1; 10-12-2009 at 09:16 PM.
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Old 07-24-2012, 03:56 PM   #10
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2000 GMC savana van headlight problem


Quote:
Originally Posted by rselectric1 View Post
Interesting thread. I have a 2001 GMC Savannah with the exact same issue. The dealer "couldn't see the problem" when it was under warranty, but now they seem to know exactly what's wrong.

PS Jim, do you ever hear a "clicking sound" from behind the speedometer when you are starting or turning off the truck?

So are we saying the issue is the headlight switch? I also have a 2001 GMC Savana with mysterious headlights on or not issue.
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Old 07-24-2012, 05:44 PM   #11
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2000 GMC savana van headlight problem


A minimal cost way to solve this is:

Get a vehicle schematic.

Connect several wires to key test points in the vehicle wiring and bring their ends to a labeled terminal block.

When the problem shows, use what time you have to check voltages on these terminals.

Post back.

Last edited by Yoyizit; 07-24-2012 at 05:46 PM.
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