Question about 2003 Chevrolet Impala

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Lighting when i switch over to high beams all of my lights go out, when switch back the low does not come back on untill i play with the switch, also my back lights on the odmoeter, and radio go in and out. I have checked all of the fuses and they seem to be good.

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My car did this as well. It was the switch itself that eventually shorted out cause another wire to short out. It costs me about $1500 in damages since my car was no longer under warranty. I would say bring it to the dealership ASAP.

Posted on Feb 11, 2009

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I think you'll find that the switch is the problem. I've seen this problem before and the switch was the trouble 95%of the time.

Posted on Oct 21, 2008


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Headlights not working on 2003 alero/all other lights working/checked fuse and changed relay

Here is how they are suppose to work .
The headlamps may be turned on two different ways. First, when the driver places the headlamp switch in the HEADLAMP position, for normal operation. Second, with the headlamp switch placed in the OFF position, for automatic lamp control (ALC). During ALC, the headlamps will be in day time running lamp (DRL) operation in daylight conditions, or low beam operation in low light conditions. The LH HDLPand RH HDLP fuses, supply battery positive voltage from the underhood junction block to the left and right headlamps. The circuit continues through both low and high beam lamps, then back to the underhood junction block. The low beam and high beam circuits continue to the headlamp switch. The low beam and high beam circuits also provide the body control module (BCM) with both low and high beam inputs. The headlamp switch includes the dimmer switch and the flash-to-pass switch. When the headlamp switch is placed in the HEADLAMP position a path to ground is provided. Ground is provided at G201. Depending on the position of the high/low beam switch, either the low or high beam circuit will now have power and ground.
The LH HDLP fuse in the underhood junction block, supplies battery positive voltage to the automatic lamp control (ALC) headlamp relay coil circuit. The ALC relay switch circuit is connected to the low beam circuit at the headlamp switch. When the headlamp switch is placed in the OFF position, the BCM will automatically turn on the low beams in low light conditions. The BCM energizes the ALC relay, closing the switch contacts and grounding the low beam circuit. Ground is provided at G201. With the headlights in the low beam position, the high beams may be momentarily turned on or flashed with the dimmer switch handle. The flash-to-pass feature is accomplished by pulling the dimmer switch handle toward the driver. The headlights may be switched to high beam with the opposite movement of the dimmer switch lever. When the headlamp dimmer switch handle is pulled toward the driver, the flash-to-pass switch closes grounding the high beam circuit. Ground is provided at G201. Both high beams will remain on until the driver releases the switch handle.
If the driver places the headlight switch in the HEADLAMP position , the headlights will remain on until turned off or the battery runs dead.

Finding a wiring diagram to use along with a DMM - digital multi-meter (voltmeter ) To test the electrical circuits for the headlamps B+ power & ground side of the circuit is the way to find a fix .
Watching a few basic electrical testing video's on youtube may help you .
Basic Electricity for Service Techs Ohm law Current Flow Opens Shorts
How to Use Multimeter to Troubleshoot Common Problems
The Trainer 18 Electrical Testing Tips
Can take years to learn how to trouble shoot automotive electrical systems properly .

Nov 21, 2017 | Cars & Trucks

1 Answer

High beam do not work at all low beam works fine when switched to high beam no lights at all

I suggest you first check the bulbs. It isn't unusual that both bulbs fail together.
If the bulbs are ok refer to the vehicle handbook and check the fuse(s).

If those are ok it is time to move onto the supply and check it through with the aid of a wiring diagram. The fault could be a relay or the dipswitch, wiring, connections...

It is worth noting on later vehicles electrical equipment is not switched on with the light, wiper, heater switches but these merely instruct a local black box to send a signal to other black boxes to perform the desired function. In the case of problems a dedicated scan tool will be required for diagnosis.

Aug 10, 2015 | Cars & Trucks

1 Answer

Headlights I have a 2001 impala my head lights are not working on low beam. I have replace the relay fuse still nothing. lamp switch does not come on. I have a day time mood an this is not working until I...

Pulling on the turn signal switch is called "flash to pass" and you are activating the high beam lights.
Have you checked to see if you have power in and out of the dimmer switch on low beam ?

May 28, 2013 | Chevrolet Impala Cars & Trucks

2 Answers

No low beam lights but have high beam lights

check the light globe as a lot of cars have two filaments in the halogen globe. One for low beam and one high beam filament.
You could get a 12v probe and then pull of the light plug and see if low beam bul is getting 12 volts when lights on low beam.

Oct 12, 2017 | 2003 Land Rover Freelander

1 Answer

Light switch ( signal cruise and wiper also)

its the light switch (combination switch) needs to be replaced

Jun 18, 2012 | Cars & Trucks

1 Answer

Both headlights do not function on low beam but

there is a bad connection in the switch or the multifunction switch is bad

Feb 09, 2010 | 2004 Toyota Tundra

1 Answer

2001 Ford Focus - High beam / low beam problem with headlights

just replace the dimmer switch under the column its wore out on the low beam side

Jan 17, 2010 | 2005 Ford Focus

2 Answers

My low beam lights sometimes stop working i still have high beam and daylight runing lights after a while they come on.2009 elantra dealer can't find problem.

when the low beams quit try switching from high to low and back and see if low beams stay on, if they do it may be the dimmer switch, if that doesn't change anything suspect the headlight switch.

Sep 02, 2009 | 2009 Hyundai Elantra

1 Answer

Headlights staying On

You probably have a faulty sentinel switch. It's supposed to shut off, has a bult in elctronic timer. Does it even have the sentinel switch?

Mar 03, 2009 | 2002 Ford Explorer

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