Low Beam Headlamp Problem - 2005 3.4L Impala - Chevy Impala Forums
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post #1 of (permalink) Old 11-19-2009, 02:13 PM Thread Starter
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Low Beam Headlamp Problem - 2005 3.4L Impala

I'm so glad I found this forum, there's another forum I usually go to for help about my Firebird, so hopefully someone here can help me out.

The Low-Beams on my brother's Impala stopped working. I've looked through as many wiring diagrams as I can find and I can't seem to find a single problem that would cause these problems to happen, let me describe them to you:

With the Headlamp Switch in OFF and Bright Light on the Ambient Light Sensor, the low beams turn on. If you cover the ambient light sensor with your hand, the Low Beams turn off and the Parking lights turn on.

With the Headlamp switch in "Head," the low beams simply don't work at all. The high beams DO work just fine, but the lows will not. The wiring diagram I'm using shows a hard path from "Hot at all times" to ground when the Multifunction switch is in Low and the Headlamp switch is in Head... so I'm confused how this could happen.

Here's my thoughts: The Multifunction Switch must be working, since the Daytime Running Lights work, and their circuit path goes through the Multifunction Switch. The Headlamp Switch must be working, because the High Beams work. All interconnecting wiring must be OK since the DRL system turns on the low beams, and the high beams function correctly. The BCM may or may not be working correctly, but I can't find a single way the BCM could PREVENT the low beams from coming on through the hard switch.

Any thoughts? If I left out any important details, let me know. Or, if you could give me a detailed description of the PROPER operation of the DRL's ambient light sensor, I'm not quite sure how it SHOULD be acting in the first place -- to me, it seems a little odd to turn the lights off at night.
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post #2 of (permalink) Old 03-24-2010, 11:54 AM
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during the day the DRL turn on the low eliment in the high beams and when it gets dark it turns on the lowbeams and marker lights, from what i am hearing it could be the directional switch cause i had problems with it when i turned the car on at night and the lowbeams wouldnt come on and i reasched down and wigged the harness and they came on. now i have HIDs in my 03 impala with a relay harness and a switch to a brown wire on the directional switch to turn on the lowbeams instead of it turning them on then off while starting. More likely its a fuse or the directional switch in the steering colom. just have to look into it more
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post #3 of (permalink) Old 03-24-2010, 12:05 PM
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That's correct. The blinker/wiper switch on the column can cause the issue. If the lowbeam contact in the switch is broken the lows will not work.

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post #4 of (permalink) Old 05-16-2010, 06:16 PM
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that happened to my 05 base too! my lights wouldn't work for like 2 days then i had enough trying to find the relay i actually hit the fuse box and they worked i was shocked this prob wont help but just know your not alone with that problem
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post #5 of (permalink) Old 06-02-2010, 09:20 PM
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Check your fuses. The plastic panel covering the fuses should have a diagram detailing what each fuse covers. If yours is missing, or unlabeled, check your owner's manual, or a Hanes(tm) or Chilton(tm) repair manual. Often if a headlight is not working, it is the result of a blown fuse. Fuses have a wire running through them that will melt when too much current is run through them. If the fuse is blown, the wire will be broken. If the fuse for the headlight you are working on has an intact wire, it is likely the problem lies elsewhere.

Swap the headlight for its twin. If your left headlight does not work, put the light from your right headlight in its place. If it works with the other headlight in place, your headlight bulb is dead, and needs to be replaced.

If this does not work, try using a voltmeter on the plug for the bad headlight. Turn on the ignition, and turn the headlight switch. If the voltmeter shows no current, then either your switch or the wiring leading to the headlight has gone bad.

If replacing your headlight switch does not solve the problem, then there is a break in the wiring leading to the headlight, and the wiring will need to be replaced.

Good Luck
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