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Low beam headlights wont turn on and high beam will only flash. if i wggled the turn signal switch they came on but not anymore

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You might want to first check your fuses to see if any fuses burned up. But, it does sound like your light switch went bad. Replace the light switch and it should work normally again. Hopefully, this will FixYa problem!

Posted on Oct 11, 2010

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Posted on Jan 02, 2017

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2007 chev sub head lights wont turn on


Do you know anything about automotive electronics ? Electronic control modules .
Headlamp ON/OFF control is determined by the body control module (BCM) by a signal on the headlamp switch on input circuit when the headlamp switch is in the HEAD position. When the headlamp switch is in the AUTO position, the BCM determines headlamps ON/OFF by the voltage from the ambient light sensor.
If the headlight switch is left in the ON position, the inadvertent power control feature will turn OFF the headlights approximately 10 minutes after the ignition switch is turned to the OFF position. If the driver places the headlight switch in the ON position after the ignition switch has been turned OFF, or if the ignition switch is in the ACCY position, the headlights will remain ON until turned OFF or the battery runs dead.
The high beam indicator is illuminated when the instrument cluster receives a GMLAN serial data message from the BCM that the high beams are illuminated.
High Beams
The high beam headlamps receive voltage from the headlamp high relay located in the underhood fuse block. The BCM controls the relay on the headlamp high beam relay control circuit. High beam control is determined by a signal on the headlamp dimmer switch signal circuit from the multifunction switch. When the headlamp dimmer switch signal circuit is grounded, the BCM grounds the headlamp high beam relay control circuit, illuminating the high beam headlamps. The right and left high beam circuits are independent and are fused independently in the underhood fuse block.
Low Beams - Standard
The low beam headlamps receive voltage from the headlamp low beam relay located in the underhood fuse block. The BCM controls the relay on the headlamp low beam relay control circuit. Low beam control is determined by a signal on the headlamp dimmer switch signal circuit from the multifunction switch. When the headlamp dimmer switch signal circuit is open, the BCM grounds the headlamp low beam relay control circuit, illuminating the low beam headlamps. The right and left low beam circuits are independent are fused independently in the underhood fuse block.

Hooking up a factory scan tool an checking DTC'S - diagnostic trouble codes would be the very first step in trouble shooting this problem .
DTC B257A 00: Headlamp Switch Input Signal Mismatch
DTC 2575 00: Headlamp Control Circuit

Jun 30, 2017 | Cars & Trucks

2 Answers

My headlights wont work


I don't believe there is a fuse. There is a circuit breaker built into the headlight switch. If you are sure the headlight switch is good, it could be a bad dimmer switch. If you have a voltmeter, with the headlight switch turned on, a larger yellow wire going from the headlight switch to the dimmer switch should be a hot wire. The dimmer switch sends power on a tan wire to the low beams, and through a light green wire to the high beam bulbs.
If your high beam indicator on the dash also doesn't work, then it is likely one of those switches. A voltmeter or test light would need to be used to find which one is bad. If you can find the connector at the steering column going to the dimmer switch, pull it apart and check for power on the yellow wire coming from the headlight switch, with the headlight switch turned on. If no power, the headlight switch is bad. If there is power there, then the dimmer switch must be bad.

Jan 21, 2014 | 1993 Oldsmobile Cutlass Ciera

1 Answer

One of my turn signals wont work, both my headlights only work on highbeams


replace the high beam switch which causes this problem. Also clean the terminals for the directional light bulb. That will cause a negative continuity to the bulb

Sep 01, 2012 | 1996 Mazda MX-5 Miata

1 Answer

The high beam indicator is on. The low beams don't work.


You need a new headlight dimmer switch located on the steering column between the dash and the firewall

Jun 03, 2010 | 2000 Mazda MPV

1 Answer

Headlight issue on a 99 Audi A4 1.8T


Your headlight switch has overheated and failed. It's common. The switch is $158 new and replacement requires airbag and steering wheel removal.

Apr 20, 2010 | 1999 Audi A4

1 Answer

93 Camry Headlight Switch


From the symptoms you describe it sounds as though your headlamp switch is dirty, broken or out of adjustment. I would disassemble it and find out what is going on.

Oct 23, 2009 | 1993 Toyota Camry V6

2 Answers

The headlights are stuck on high beam.


pull on the signal lever toward you (ceter position). the signal lever controls the head lights either high beam or low beam. if you pull on the signal lever toward you again, you will have high beam temporarily. and if you push the signal lever towards the front, you will have the high beam locked.

Jan 12, 2009 | 1990 Buick Regal

2 Answers

What would cause both low beam headlights to go out at the same time? i have replaced the headlights and they still dont work.


The headlight high/low beam switch assembly.96 Safari has the turn signal stem as the high/low beam switch.Removal of the steering wheel is necessary to get to the switch assembly for replacement.

Jul 13, 2008 | 1996 GMC Safari

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