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My 2003 pontiac montana has a headlight issue. Here's the details. Low beams are half voltage. 5.8v High beams are fine. 12.9v Fog lights work only on parking lights but are off on low beam. I think it's stuck on daytime running lights.

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Sounds like some wires are damaged due too chafing or moisture. Trace the wires starting at the lights looking carefully for damage. Sometimes the spot that's chafed is difficult to find so look very closely at the wires.

Posted on Nov 23, 2014

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1 Answer

2004 Pontiac Grand Am High Beams and Fog lights do not work


Check the relay that powers the high beam, if memory serves me the relay is shared between those two circuits.You can swap the relay with a known good relay to prove if that is the issue.

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2003 Pontiac Grand Am brights work but ONE low beam is out ...


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You SHOULD have 2 tabs ,one at each end to pull up and the headlight assembly should then come out easily.
Tapping a blown out headlight can reattach the filament for a short time but after that replacement is necessary.

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High beam indicator comes on with fog lights


Could your Mazda have daytime running lights? If you checked all fuses, did that include the three in the joint box?

There is an auto light-off control module that is central to all functions you describe. It is assumed that you would only turn on the fog lights with headlights on and set for high beam. If you set the headlight switch to LOW, the module closes the headlight relay to turn on the low beams. If you then turn the headlight switch to HIGH, the module turns on the high beams and allows you to turn on the FOG LIGHT switch, closing the fog light relay and turning on the fog lights. Since this sequence is not working, I suggest checking both high beam lamps as both could be burned out. Other possibilities are a defective headlight switch or the module

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1 Answer

2000 pontiac montana. I want to replace the driving ligh bulbs. the under the headlights what size is it?


Fog/Driving Light Bulb Size: 880
Here is the rest of the bulb size used in your Montana.
2000 Pontiac Montana Auto Light Bulb Diagram
Low Beam Headlight Bulb Size: 9004
High Beam Headlamp Light Bulb Size: 9004
Parking Light Bulb Size: 4157NALL
Front Turn Signal Light Bulb Size: 4157NALL
Rear Turn Signal Light Bulb Size: 3156
Tail Light Bulb Size: 3057
Stop Light Bulb Size: 3057
High Mount Stop Light Bulb Size: Assembly
Fog/Driving Light Bulb Size: 880
License Plate Light Bulb Size: 168
Back Up Light Bulb Size: 3156
Front Sidemarker Light Bulb Size: 194
Ash Tray Light Bulb Size: 558
Glove Box Light Bulb Size: 194
Map Light Bulb Size: 168
Dome Light Bulb Size: 562
Step/Courtesy Light Bulb Size: 168
Trunk/Cargo Area Light Bulb Size: 212-2
Daytime Running Light Bulb Size: 3157NALL
Thank you for using fixya.


Apr 30, 2010 | 2000 Pontiac Montana

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My low beams are out on my 03 Montana


I would check the hi-lo beam switch first.

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sounds like either a wiring loom is shorting across somewhere ??where ----best of british to finding it

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Low beam headlights not working on 2004 Pontiac Montana extended


You headlight lamp have a diffuser mechanism which allows it to flip between the hight beam and low beam feature of the bulb. In fact, you high beam will function even if the low beam is not working.

I would recommend the purchase of the new headlight lamp. It would cost you you any where from $15.00 per unit to get a replacement lamp

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