Question about 1996 Lincoln Town Car

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Brake lights do not come on when the brake pedal is applied.

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Check fuses and the brake light switch just above the brake pedal.

Posted on Dec 30, 2010

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2010 Cadillac dts the cruse control don't work sometimes and the brake lights don't turn off and the switch key will not come out ,other times it works normal


The crusie control not working would be caused by brake lights being on same as for the key not coming out . You need to test the brake pedal position sensor . The brake pedal position sensor is under the dash hooked to the brake pedal arm . You need a wiring diagram to tell which wires are what . The pedal position sensor isn't like brake light switch from years past , it's an input for the BCM - body control module .There is three wires at the switch , 5 volt ref. , ground and signal . All go to theBCM . You could have a sensor problem , problem with the BCM . There could be DTC'S - diagnostic trouble codes stored in the BCM .
The brake pedal position sensor is used to sense the action of the driver application of the brake pedal. The body control module (BCM) provides a 5-volt reference voltage and low reference to the brake pedal position sensor. The position sensor provides an analog voltage signal back to the BCM that will increase as the brake pedal is applied. When the brake pedal is applied, the BCM will then apply battery voltage to the left and right stop/turn signal lamp supply voltage circuits and the center high mounted stop lamp (CHMSL) supply voltage circuit illuminating the stop lamps. At the same time the BCM applies battery voltage through the signal circuit to the transmission control module (TCM) and the engine control module (ECM) indicating that the brakes are applied.

Your best bet would bet to take it to qualified repair shop

Jan 04, 2017 | 2010 Cadillac DTS

1 Answer

Where's is the fuse located for my brake lights on my 2007 Pontiac g6 and rear defrost fuse


Stop Lamps
your br
The brake pedal position sensor is used to sense the action of the driver application of the brake pedal. The brake pedal position sensor provides an analog voltage signal that will increase as the brake pedal is applied. The body control module (BCM) provides a low reference signal and a 5-volt reference voltage to the brake pedal position sensor. When the variable signal reaches a voltage threshold indicating the brakes have been applied, the BCM will apply battery positive voltage to the stop lamps, transmission control module (TCM), engine control module (ECM), and stop lamp relay coil side. When the stop lamp relay receives battery voltage from the BCM, the relay coil is energized and the stop lamp relay switch contacts close applying battery voltage through the STOP LP fuse to illuminate the center high mounted stop lamp (CHMSL).
I'd say you have more then a bad fuse ,just reading how the brake lights function .You should have it hooked up to a professional grade scan tool ,one that can check for DTC'S - diagnostic trouble codes in the BCM - body control module !
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the Brake Pedal Position Sensor parameter in the data list for the body control module (BCM).
  4. Apply and release the brake pedal.
Does the scan tool display a change in the voltage?

DTC B3903 Stop Lamp Relay Circuit DTC C0277 Brake Pedal Position Sensor Circuit
DTC C0278
Did you perform the Diagnostic System Check - Vehicle?
Go to Step 2
Go to Diagnostic System Check - Vehicle

2

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
Does the scan tool display DTC C0278 00?
Go to Step 3
Go to Testing for Intermittent Conditions and Poor Connections

3

Recalibrate the brake position sensor.

Circuit Description
DTC C0870
The body control module (BCM) applies a ground through the brake sensor reference low circuit to the brake pedal position (BPP) sensor. The BCM supplies a 5-volt reference through the brake sensor reference voltage circuit to the brake position sensor. When the brake pedal is being applied, the BPP sensor then sends a variable voltage signal through the brake sensor signal circuit to the BCM.
Circuit/System Verification
  1. Ignition ON, observe the scan tool Brake Lamp Cmd. parameter as you apply and unapply the brake pedal. The parameter should change between OFF and ON as the brake pedal is applied and released.
  2. ?‡'
    If the parameter does not change as the brake pedal is applied and released, refer to Brake Pedal Position Sensor (BPPS) Malfunction.

  3. With a scan tool, command the LR Stop/Turn Signal Lamp ON and OFF. The LR turn signal should turn ON and OFF when changing between the commanded states.
  4. ?‡'
    If the LR stop lamp does not illuminate when commanded, refer to Stop Lamps Malfunction.

  5. With a scan tool, command the RR Stop/Turn Signal Lamp ON and OFF. The RR turn signal should turn ON and OFF when changing between the commanded states.
?‡'
If the RR stop lamp does not illuminate when commanded, refer to Stop Lamps Malfunction.






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Sep 26, 2015 | Pontiac Cars & Trucks

1 Answer

Brake lights 98z71.New brake switch,but when brakes applied switch doesn't activate.I can apply pressure on switch and press pedal i then have brake lights.Y won't switch engade pressing pedal?


try adjusting the switch away from the pedal as it requires to be free when the pedal is moved so that the contacts in the switch can activate and turn on the lights.

Sep 03, 2015 | Cars & Trucks

1 Answer

Brake lights wont work when pressure is applied


brake switch needs adjustment if it works with slight pressure on the pedal readjust it where it needs to be..

Feb 09, 2013 | 1999 GMC Yukon

2 Answers

Brake lights do not come on


You may have a defective brake switch. The switch is located behind the brake foot pedal. When you apply pressure to the brake foot pedal, the switch should compress.

Aug 22, 2012 | Chevrolet Chevy Cars & Trucks

2 Answers

Where is the brake switch located on a 1990 geo prizm?


Brake Light Switch The brake light switch is located at the top of the pedal arm. It is the switch which turns the brake lights on when the brakes are applied. The plunger type switch is held in the off position by the normal position of the brake pedal; when the pedal moves during brake application, the switch plunger moves forward and the brake lights are brought on. The switch is almost always the first place to look for the cause of the brake lights flickering over bumps or staying on without use of the brakes. If the brake lights fail to work with the brakes applied, check the fuse first and then check the switch.

Oct 27, 2010 | 1990 Geo Prizm

1 Answer

My brake lights doesn't work unless I press the brake pedal all the way to the floor


HI, it sounds like your brake light switch is out of adjument. You can adjust the switch yourself. You will find the located at the top of the brake pedal. You may need to remove the plastic cover panel under the dash to get your hands up to the switch. The switch has a plunger on it that extends and retracts as the pedal is applied so you will need to push the brake pedal in by pushing on the back of the switch this will move the plunger closer. Now when you release the pedal and apply the brake pedal it will self adjust. This should correct your problem. Happy motoring.

Sep 01, 2010 | 1996 Lincoln Town Car

1 Answer

Brake lights stick on


It sounds like the brake light switch down on the brake pedal is stuck and it needs replaced,Its got like a push button setup when you apply the brakes the brake pedal pushes the brake switch button in brake lights come on and when you relase the brake pedal the button on the switch comes back out and brake lights go out but if switch is worn out or sticking the lights will stay lit even when off the brake pedal so just replace the brake light switch down on the brake pedal.

Apr 20, 2010 | 1992 Dodge Dakota

2 Answers

All of the bulbs for the brake lights are new all


Brake light switch, think it should be under the brake pedal. when brakes are applied, the pedal compresses the switch, which makes the brake lights come on.

Dec 31, 2009 | 1994 Nissan Altima

1 Answer

My brakes are locking up on all four wheels on my 04 sentra.


Your brake light switch is adjusted in all the way and is pressing on the brake pedal. This causes the brake to be slightly applied. As you drive the vehicle the brake fluid heats up and expands, the brakes will apply more and more until you see the smoke. Bottom line: your brakes are always applied at the master cylinder because something(usually the brake light switch) is out of adjustment.

Nov 12, 2008 | 2000 Nissan Sentra

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