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Would it be possible for a faulty brake switch to be the cause of a flat battery? My two rear lights have been on all morning (without the keys in the ignition) and when I went to start my car up an h

Faulty brake switch/flat battery.

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  • 48 Answers

Yes, most likely the cause is a faulty brake light switch causing the brake lights to remain on.

Posted on Dec 12, 2012

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

mmptruck
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SOURCE: TOYOTA CAMRY 1988 AUTOMATIC TRANSMISSION,

Yes, it could be neutral inhibitor switch on trans, or also check that the wiring at starter motor, check all connections are tight and clean.

Posted on Aug 02, 2008

  • 1779 Answers

SOURCE: 1992 Honda Accord LX Brake Light Switch Repair

Of course you can make this repair! I'm wondering about the faulty bulb that shorted out all the brake lights...not sure if that's what happened. Your brake light switch is located on the brake pedal, up above where your foot goes. It has a plug in connector which you unplug, then loosen the locknut where it attaches to the pedal.Put in the new switch, lock nut 1st, then plug it in. Note that the locknut is the adjustment point that determines when your brake lights go on. Adjust the locknut so that the brake lights go on when the pedal is depressed within 1/2 an inch (13mm)of pushing down on it. If the switch is adjusted without enough play (say 1/8 inch or less), brake lights may flicker on and off when you go over a bump.If over 1/2 inch, brake lights might go on only if great force on pedal is used (or not at all, yikes!).For good diagrams of parts check out South Bay Honda (hondapartscheap)web site. You enter the year, model, engine, and you can scroll thru tons of parts. If you have any more questions, do not hesitate to post it for me. countrycurt0

Posted on Aug 08, 2008

  • 3 Answers

SOURCE: Jag S Type won't start,alarm sounds lights flash fault messages

try taking the negative off the battery for 20 secs then put it back on and try it

Posted on Feb 18, 2009

  • 24 Answers

SOURCE: 1996 audi a4 ignition kill switch wont recognise car keys

HI,MARK,THE SIGNAL FROM YOUR KEY IS NOT GETTING TO YOUR IMMOBILIZER.THE PROBLEM IS MORE LIKELY AT THE PLUG ON THE READER COIL ON THE IGNITION.YOU WILL HAVE TO BEND THOSE TERMINALS SLIGHTLY CLOSED AND INSULATE THE WIRES SEPERATELY.THIS FEATURE IS PART OF THE VEHICLES SYSTEM UNFORTUNATELY,ANDY

Posted on Mar 19, 2009

  • 179 Answers

SOURCE: where is the starter relay on a 94 Honda Accord

Yes, it sounds like your solenoid is bad and staying engaged against the flywheel, you could do an amperage draw and a voltage drop test to find out for sure, but you will need an DVOM and a amp clamp. Or you could take it into an auto parts store and they will test it for free. Hope this helps.

Posted on Jul 06, 2009

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1 Answer

Van drove in this morning done front and rear brakes then came move out garage and it is totally dead no electrics at all


It is possible that in pumping brake pedal (if you did this to bleed or flush brake fluid) the brake light switch may have become dislodged and thus the light stayed on draining the battery.

Feb 17, 2016 | Cars & Trucks

1 Answer

Brake light and battery light both on


Hi Greg:

Is it possible that the brake switch is stuck on?

That would eventually cause the battery to go dead.



I'd suggest you charge the battery and try temporarily removing the wires from the brake light switch. See if the problem continues. Do not run the vehicle on the road without functional brake lights. UNSAFE, and ILLEGAL.

Aug 02, 2015 | Cars & Trucks

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Rear brake lights won't turn off


Check brake light switch (likely faulty). This issue may not be related to the engine issue.
If not the brake switch then check wiring for possible short circuit.

Nov 03, 2012 | 1999 Pontiac Sunfire

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Brake lights dont turn on without me pressing the brake, i need the safety rear lights to work, they wont stay on wen the car runs. what could be the problem?


Replace the brake light switch sounds like its faulty.Usally if the brake lights stay on its because of a faulty brake light switch.

Feb 03, 2012 | 1988 Ford Ranger

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Right rear brakelight is stuck on all the time even with the key off


SOUND LIKE BAD BRAKE LIGHT SWITCH OR SWITCH IS OUT ADJUSTMENT.YOU LOOKING AT RIGHT REAR BRAKE LIGHT THE LEFT BRAKE COULD BE BLOWED OUT REALLY BOTH BRAKES LIGHTS WOULD BE ON MOST OF THE TIME IF BRAKE LIGHT SWITCH FAULTY.

Jun 13, 2010 | 2001 Jaguar XJ8

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Wont shift out of park and i have no brake lights


MAKE SURE YOUR BATTERY HAS 12.5 VOLTS.POSSIBLE CAUSE TO YOUR PROBLEM IS FAULTY BRAKE LIGHT SWITCH.FAULTY TRANSMISSION NEUTRAL SWITCH OR FUSE.YOU COULD HAVE FAULTY BRAKE TRANSMISSION SHIFT INTERLOCK SOLENOID.

Jun 02, 2010 | 1991 Lexus LS 400

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Igniton key is stuck in switch and won't turn off


Check the shift cable to the shifter to the transmission,and the shifter could be malfunctioning.

May 16, 2010 | 2004 GMC Envoy

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My rear brake lights do not want to turn off? The


sounds like a faulty brake lamp switch..you can remove brake lamp fuse for now,so it doesn't kill your battery..switch is located on pedal arm..unplug it and see if they go out..if they do..you need a switch..most likely the cause,,available from dealer..i hope this helps

Jan 11, 2010 | 1999 Jeep Grand Cherokee

1 Answer

Rear lights stays on but the ignition is off


CHECK BRAKE LIGHT SWITCH.IT COULD BE OUT OF ADJUSTMENT IT COULD BE TOO FAR FROM BRAKE PEDAL.LOOK AT BRAKE SWITCH ON BRAKE PEDAL.THE BRAKE SWITCH HAS A STEM LIKE SWITCH.THE STEM SHOULD BE TOUCHING PEDAL ARM.IF NOT ADJUST IT SO SWITCH WILL TOUCH THE PEDAL ARM.IF ALL IS GOOD. THE PROBLEM COULD BE THE COMBINATION SWITCH.

Aug 04, 2009 | 1995 Toyota Tacoma

1 Answer

1998 Mercury Villager Break light switch


go here for help. http://autos.groups.yahoo.com/group/villagerquest/

Brake light circuit goes through turn signal switch. Do turn signals work ok? Does high mount stop lamp do this too? If you disconnect brake switch, do the lights go off? Do you have trailer tow? Maybe that wire is an issue. I would check brake switch first again. Maybe out of position.

I think you need to adjust the switch.

Installation
  1. Install the BPP switch.
  1. Adjust the BPP switch. Refer to the procedure in this section.
  1. Tighten the BPP switch locknut to 12-15 Nm (9-11 lb-ft).
  1. Connect the BPP switch electrical connector.
  1. Connect the battery ground cable.
Section 17-01: Lighting, Exterior 1998 Villager Workshop Manual
ADJUSTMENTS Brake Pedal Position (BPP) Switch
  1. Measure the distance between the brake pedal stopper and the threaded end of the brake pedal position (BPP) switch. The BPP switch height (A) should be 0.3-1.0mm (0.012-0.039 inch).


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  1. If the BPP switch height is not within specification, loosen the BPP switch locknut.
  1. Adjust the BPP switch until the height is within specifications.
  1. Tighten the BPP switch locknut to 12-15 Nm (9-11 lb-ft).
STOPLAMPS Condition Possible Source Action
  • Stoplamps/Rear Hi-Mount Lamp Inoperative
  • Fuse.
  • Circuit.
  • Brake pedal position (BPP) switch.
  • GO to Pinpoint Test Step K1 .
  • One or More Stoplamps Inoperative
  • Stoplamp bulb(s).
  • Circuit.
  • GO to Pinpoint Test Step L1 .
  • Stoplamps/Rear Hi-Mount Lamp On Continuously
  • BPP switch.
  • REPLACE the BPP switch.


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Apr 20, 2009 | 1998 Mercury Villager

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