Question about 1997 Mazda MX-5 Miata

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When I switch from low beam to high beam the lights go off, is there a fuse or is the dimmer switch broken?

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If you can flash your brights and they work it is the dimmer switch

Posted on Jun 18, 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

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1 Answer

Low beams not working but high beams are on a 2000 chevy metro


The headlight relay provides power to the dimmer relay, then power goes thru a fuse for each light for each circuit (4). The low beam fuses are in fuse block 2. The dimmer relay is controlled by the daytime running light module. The headlight and dimmer switches send signals to the DRL module. You may need a shop manual to troubleshoot the circuits.

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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

1996 dodge Ram 1500 4x4 headlights dont work.All other lights work. Headlight lamps are all good. Could it be the switch or the multifunction switch? High beam works when I pull on the directional le


The headlight switch gets power for the headlights from a 50amp fuse.
The fuse powers the headlight switch then the dimmer switch breaks for high and low beams. So if the high beams work, the problem may be with the dimmer switch.
The dimmer switch is made into the turn signal switch on the column. You would need to check the low and high beam circuits at the switch for power.

Jan 14, 2013 | Dodge Pickup Cars & Trucks

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HOW DO YOU REPLACE THE DIMMER SWITCH IN A 2001 BUICK CENTURY


The dimmer switch relay for a 2000 Buick Century is Located under dash right side of the fuse box.

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1 Answer

Is there any fuses or relays that are not in the fuse box on a 2002 buick rendezvousfor the bright lights


The high and low beam lights use the same power source, so if the low beams work the high beams have power.
There is a low and high beam relay controlled by the dimmer switch.
If the low beams work and the high beams don't, and the bulbs are good, check the dimmer switch and the high beam relay.

Aug 04, 2012 | Buick Rendezvous Cars & Trucks

1 Answer

My low beams do not work. If I put on the high beams both the low and high beams are on.


Both highs and lows coming on when flipping to highs is normal. (You low beams are dual filament) Now low beam issue is either "lo beam fuse" in your fuse box or dimmer switch (switch used to flip between high/low beams. Check your fuses first, it their good then you need a new dimmer switch.

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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

High beams work but low beams do not. Fuses seem to be good


Hi

I would start with the dimmer switch if you know the lights are good dimmer switches do this you will lose your high beam or you will lose your low beam when they go bad.

Feb 26, 2009 | 2004 Pontiac Grand Prix

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