Question about 1991 Buick Park Avenue

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Headlights don't work? I've already checked all fuces and headlamps,all were fine. can you please help?

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  • Tom Coffman Jan 12, 2009

    I have this problem all of my lights are working except my dim lights they are both out but i have bright lights

  • Anonymous Jan 13, 2009

    i have the same problem i replaced the dimmer switch and headlight switch everything works but my headlights still wont work

  • Anonymous Jan 26, 2009

    head litht assembly How do it come out

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The problem can be in wire connections to headlights check the place where wires come into harness plug or harness plug itself. They might not be tight enough.
Good Luck

Posted on Dec 18, 2008

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Did you check the fuses under the hood and under the dash? I was having the same problem. It might be in the swich on the door. If it is you can just leave that switch off and use the switch where the dinner is.

Posted on Mar 17, 2009

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You might want to che k the headlamp switch it controls the running lights and also the headlights i had same problem headlights work but no running lights

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Parking lights work but headlights don't checked fuses large fuses and small fuses under hood . What else could be causing it. Is there an easy way to check the light switch


Hi Clark,

The headlamp system in your Eldorado is controlled by the Body Control Module (BCM). Besides the light switch on the dash (which only provides grounds for certain BCM circuits) There are 10 different fuses, 5 relays, an ambient light sensor, a headlamp dimmer switch, the BCM and the Instrument Panel Cluster (IPC) involved in your headlamp circuits.

You asked about an easy way to check the switch...

The easiest way is to connect a scan tool and verify headlamp switch input at the BCM as you operate the switch and watch the BCM data.

I recommend that you begin this diagnosis by scanning your computer network for fault codes that may lead you to the cause of the problem. Please note that MOST generic OBD scanners (code readers) cannot access the BCM or IPC data.

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Both headlights out on 1997 Jeep Wrangler. Don't see a fuse in the box in the dashboard indicating headlamps. Looked in the engine compartment, but don't know which fuse to check.


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98 ford lariat. Headlights stopped working. running lights come on and brake lights and turn signals. checked all fuses under dash and under hood, pulled out headlight switch and it looks fine. note only...


Is this both the high beams and low beams that do not work ?

If you checked all 3 fuses with a meter ( with the headlamp in Low position for both low beam fuses or in high for the high beam fuse ), the next items to test are the MFS ( MultiFunction Switch ) and the main headlamp switch ( test not look at it ).

The main headlamp test chart
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The test chart for the MFS
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Oct 25, 2010 | 1998 Ford F150 Regular Cab

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Headlights won't work on my 1996 GMC sierra


My best guess is a bad ground common to both headlights.

I think the 50 amp fuse is for your starting circuit, not the headlamps, which is a 15 or 20 amp fuse. Did you try both dim and bright settings?

Since you don't know which fuse is for what, just remove and replace each fuse one at a time. As you go, visually inspect each fuse and test for continuity with an ohmmeter, then use a pink pearl eraser to clean the wafer tips before replacing. Do this methodically one at a time and replace any bad fuses with THE EXACT SAME AMPERAGE RATING.
Now, if your fuses are clearly marked and you do have a 50amp fuse in your headlamp circuit then you need to put the correct amperage in ASAP. If you have a 50 amp in the headlight circuit the whole circuit could be fried before the fuse blows, which is why you NEVER replace a fuse with a higher rated amperage.

Once you've worked over the fuseblocks go to the headlamp circuit and follow the wires and plugs coming from the lamps and going to the fuse block. Look for ground connections and tighten those, especially those coming from the headlamp wiring harnesses. If your lamps are good, the fuses are good, the plug connections are clean and making good contact and your grounds are good then all thats left is your headlamp switch and wiring to and fro. If you don't know what the plugs are for no harm can come from cleaning and reconnecting them, so you can't go wrong if you just do one at a time in a methodical fashion.
I have an old S-10 and the headlamp switch is junk- I have to hit it with contact cleaner every once in a while because Houston air quality is poor and there is a lot of ozone- all this corrodes connections- fuse maintenance cures a lot of ills.
After the fuseblocks I'd start by checking the actual headlamps to make sure they are working (check each filament for continuity or put 12v to it to test) and clean the contacts.

Then you can work your way back to the fuseblock and switch checking your plugs and connections. Its all pretty straightforward, just be methodical and clean your plug connections as you go. No schematic needed- just a little patience.

One thing to think about if your headlamps are both blown is that your alternator may be overcharging, or the regulator isn't working properly and your headlamps are blown because they got hit with too high a voltage. Eventually this will sulfate the battery and cause an internal short- if it is bulging you can be sure this is happening. So get your alternator and regulator circuit checked if this is the case.
Good luck, If this fixed ya then please rate this solution

Jun 21, 2009 | 1996 GMC Sierra

1 Answer

Headlights go off and on, already changed dimmer switch and fuse


sounds like the headlamp switch is ffaulty it has an internal breaker that trips on and off check the connector for heat damage

May 11, 2009 | 1993 Mercury Cougar

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1987 nissan 300zx headlights taillights


try checking the headlamp sensor mounted on rt front apron behind relay box . this runs all lights .

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Head lights will not turn on, fuel guage missing, radio turns off


This is an old post so I don;t even know if you still have the car, but here is what I know.

1) Your radio issue is probably a relay. It is a relay bank located above your glove box. The entire glove box assembly will have to come out. This relay is a little different in appearnace thatn the others as it is skinnier and taller. It is called the Brand Name speakers/radio relay.

2) Your dash readouts are due to a burned out bulb. These are not LED. They are regular 124 bulbs. They've burned out. Banging on the dash probably allowed the filament of in the bulb to touch and temporarily worked.

3) I have a similar problem with the headlights. My headlights turn on manually, but they don't turn on like they are supposed to via automatic photo sensor. When turned on manually, the doors open and the headlights are on. When I manually turn off the headlights, the doors don't close. I've checked everything and I was told it may have something to do with the Body Control Module. I am not completely sure as this research is ongoing.

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