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I have high beams but no low beams. could it be a fuse or the head light switch?

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Some vehicles have a separate relay for low beam, and high beam headlights. It could also be a fuse, the switch, maybe both bulbs are burnt out, or a number of other things.
If you want to further diagnose the issue, I will be happy to assist you but I would need to know what your vehicle is. Good luck

Posted on Mar 28, 2011

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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

1 Answer

Where is the headlamp relay on a 2007 saturn ion


Are both low beams an high beams not working ? What engine does your car have ? Low beam relay only on 2.2 L .
On vehicles with manual headlamps, the LH HDLP and RH HDLP fuse in the fuse block - under hood, supply battery positive voltage to both low beam lamps and high beam lamps at all times. The low beam and high beam circuits continue through the fuse block - under hood, through the body control module (BCM), and to the headlamp switch. The low beam or high beam circuit then, depending on the position of the dimmer switch, continues through the headlamp switch. When the headlamp switch is placed in the ON position, it provides a ground path for the low beam or high beam lamps through G203. The low beam and high beam circuits are monitored by the BCM.
Is there B+ voltage at the headlamp fuse's ? Power runs from fuse through the head lamps to the dimmer switch through the head lamp switch to ground when turned on . If there is B+ voltage at the fuse ,check for voltage at the headlamp switch .
The

Oct 16, 2016 | 2007 Saturn Ion

3 Answers

2005 GMC Sierra 2500HD, left side low and high beams out, new bulbs, fuses good. No power at the sockets. Could this be the high/low switch on the column?


It shouldn't be the high/low beam switch, as that switches the high/low beam relays. One high beam relay supplies power for both sides, one for low beam, both sides. If you were to lose switch function or a relay, you would lose the high beams or the low beams, but not for just one side. It would be interesting to probe the fuses with a test light and see if you're getting power to and through them. If you are, the problem would be between the fuse box and the headlight, if your not getting power to the left head light fuses, the problem will be in the fuse box. Good luck!

Nov 12, 2014 | Cars & Trucks

2 Answers

2001 suburban


Well the high and low beam lamps use the same fuses, and the dimmer switch handles the ground circuit. So I would check the dimmer switch if both high beam bulbs are ok.

Jul 23, 2013 | Cars & Trucks

1 Answer

I have aproblem with my Buick Allure both low beam stoped working.The high beam works OK. Checked the fuses and there OK can you help


suspect low beam head light fuse, check fuse if ok suspect that both low beam head lights are burned out ( it happens) ,if ok suspect headlight dimmer switch.

Nov 16, 2010 | Chevrolet Avalanche Cars & Trucks

1 Answer

I have a 1993 Honda Accord and the head lights won't turn on. I have changed the fuze and added new bulbs. what else can it be.


do you have low or high beams?

LOW BEAMS: When headlight switch is turned on the headlight relay is energized providing voltage through fuse 37 and 38 to the headlights and the low beams come on.

HIGH BEAMS : same thing as above thru fuses 37 & 38. When the dimmer is in high, the dimmer relay provides ground to the high beams, and the high beams come on.

1. pull your flash see if lights come on?
2. check fuse 15 if good
3. check fuses 37 & 38.

Feb 07, 2010 | 1993 Honda Accord

1 Answer

Headlights on reg beam dont work - what to do


when you switch your signal arm push forward for hi beam pull back low beam if you have regular beam and both beams are present then most likely it is your head light hand switch!! if fuse was blown you would have no head lights at all,so i would start with the swich good place to begin!

Jan 03, 2009 | 2003 Toyota Corolla

1 Answer

Turn head lights on every light works except low beams


thare is a high beam relay and a low beam relay in the fuse box find the low beam relay and replace it. if this dont work its probabley the switch

Dec 31, 2008 | 2003 Ford Taurus

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