Question about Ford F-150

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I have a 2003 F150 XLT. My turn signal switch is not turning my turn signals on but it still turns my high beams on. It also doesn't make a sound. All my other lights work fine. What's wrong?

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I would check the turn signal fuse. If that's OK then check the flasher. Mechanical switch broken in the stalk assy. is least likely, but also possible.

Posted on Apr 03, 2015

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There is an actual switch the knob sits in. If the metal clips are broke in the switch they wont work.

Posted on Apr 03, 2015

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Posted on Jan 02, 2017

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SOURCE: 2004 Grand Prix turning Signal lights wont work.

YOU HAVE TO REPLACE THE TURN SIGNAL SWITCH.BECAUSE WHEN IT GOES OUT.SOME TIMES YOUR DIMMER SWITCH STOP WORKING.IF YOU GOING TO FIX IT YOUR SELF BESURE TO.DISARM AIR BAGS FIRST.

Posted on Aug 19, 2009

  • 1 Answer

SOURCE: Audi A4 2002 Low beams & Right front turn signal stopped working

but on 2002 A4, F20 and F21 are empty! Does anyone has an idea where the headlight fuses located?

Posted on Jun 10, 2010

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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

Headlights only work on high beam,is it a fuse?


could be a fuse or the relay or simpler the elements in the lights blown, yes even both of them.

Sep 04, 2016 | 2003 Ford Explorer

1 Answer

I have a problem with the low beams on my headlights. The high beams works just fine. All of the other lights(turn signal, emergency lights, etc.) work except for the low beams.


Check the fuses first. then replace the turn signal switch if all fuses are good. All the lights run threw it, except the high brake light on the rear.

Jan 01, 2015 | 2003 Ford Escape

1 Answer

I have a 2003 chevy box truck and the headlamps flash while hitting bumps in the road, the turn signal swich was replaced and still does it.


I am assuming you mean the turn signal switch was replaced in the hopes the problem was the dimmer switch.
The headlight switch sends a ground signal to the body computer which controls the high and low headlight relays. It sounds like you have a bad connection in the wiring harness somewhere, especially if the high and low beams blink.

Mar 12, 2014 | 2003 Chevrolet Express

1 Answer

HIGH BEAMS COMES ON WHEN USING TURN SIGNAL AND LOW BEAMS ARE ON


Hello, is sounds like your issues are coming from within your turn signal/high-low beam switch. Most of the time the wires get worn or break and start rubbing around on each other causing troubles within the electrical circuit. Other times the contact switches inside the turn signal/high beam switch/lever wear and loose contact over time. You may be able to see wires leading from switch into steering colum. Check for bad wires, if none you may have to replace switch which you can get from any junkyard for bout 5 bucks plus learn how to take it apart in a junk car no one is worried about getting destroyed. BE CAREFULL WITH AIRBAGS when you pull your steering wheel to fix switch. It is not a difficult job to do.

Jan 16, 2013 | 2005 Ford Escape

2 Answers

2003 monte carlo turn signals blinking too fast,all bulbs good drl lights running on low beams not high beams


Just replace the flasher. you can find it under the dash on the drivers side... Just turn the key on and turn the signal light to one side or the other and follow the clicking noise.

Jul 10, 2011 | 2003 Chevrolet Monte Carlo

1 Answer

My 91 New Yorker head lights work off and on. Now the brights are stuck on with no low beam and no signals. Any ideas? A short maybe in the signal handle?


No it sounds like a faulty turn signal switch. The entire lever controls turn signals and high beam dimmer switch.

Jan 27, 2011 | 1991 Chrysler New Yorker

2 Answers

High beams come on when turn signal used.


it is the multi switch. I am replacing mine right now. i had to take the high beam bulbs out..

Oct 08, 2009 | 2002 Saturn L-Series

1 Answer

Left Turn Signal on Ford F-150


most of those issues i have dealt with are the connector on the turn signal switch or the switch itself

Apr 27, 2009 | 2004 Ford F150

1 Answer

Turn Signals and High Beams are not working and I have checked the fuse what else could it be? Everything else is working


Sounds like the combination switch is bad. The comination switch is for the turn signals and high beams and sometimes cruise control and windshield wipers. The combination switch is the turn signal lever. Also might want to check turn signal flasher operation.

Sep 12, 2008 | 1997 GMC Jimmy

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