Question about 1998 Mercedes-Benz CLK

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Wiring problem where do you find the brake light sensor/switch

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Generally, the Brake Light Swtich is located over brake pedal, top and back side.

Check it.

Posted on Jul 11, 2013

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Posted on Jan 02, 2017

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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

How to wire up brake light sensor on 359 peterbilt


no brake light: bad bulbs? or bad brake switch or both, ground wire?

Oct 12, 2015 | Cars & Trucks

3 Answers

2002 jeep liberty brake lights don't work. About 5 days ago the rear lights would not turn off replaced tail light switch problem was corrected ., but now the brake lights are not coming on , was...


The replacements switch could be defective (not un common).
Your brake light switch (located under the break pedal) could also be the issue. Have you made sure the bulbs were good. It is uncommon for both to go out at the same time but it is possible (especially if you were recently playing with amny electrical, a short was possible.
It would seem the problem is related to your previous somehow. You most likely have some faulty wiring/electrical component causing problems in areas around it. Take it to an autozone for a free diagnostic if the breake light swtich (under pedal) isnt the issue.
(Excerpt from howstuffworks . com)
So you've tested the brake light fuse and the brake light bulbs and there's still no juice flowing to those locations. In this situation, you'll want to check the brake light switch. It's a mechanism that connects and completes the brake light's circuit in the car's electrical system. It's a very basic two-wire switch: One wire controls the power going in while the other wire controls the power going out.
The switch is located near the brake pedal and it's probably marked. Once more, get out your test light and ground it as you did when you checked the fuses. Place the sensor on just one of the two wires and hold the brake pedal down as you do so. Then test the other wire. If power is connected and the switch is working properly, the test bulbs will illuminate. If it doesn't light up, the brake light switch is faulty and will need to be replaced. If your switch is a more complicated setup, consisting of more than two wires, use the owner's manual to locate the primary "power in" and "power out" wires and test those.
If you do all of these things and still can't get your brake lights to work, your car may have some different systems that need to be checked. For instance, some cars' brake lights and turn indicators are wired together, which means you'll need to inspect that combined system and its fuses. Some Japanese cars feature a dedicated "brake light control module," while cars with an integrated computer system usually offer onboard diagnostic scans to pinpoint any problems.

Jan 23, 2015 | 2002 Jeep Liberty

1 Answer

All my lights work except my brake lights, fuses are good and changed all bulbs and brake switch and still no brake lights.


You haven't mentioned what type of car? No matter, the brake lights have no fuse. They're hot all the time. If you have a line tester (one of the little lighted ones) check for power at the brake light switch. It could be on the brake pedal or a pressure sensor screwed into the master cylinder. The turn signals (on most cars) are the brake lights so the wires and lights are all ok. Your trouble has to be in the brake light switch or the power going to it.

Nov 16, 2013 | Cars & Trucks

1 Answer

Brake light switch


code p0703 refers to torque converter / brake switch B--circuit malfunction===causes--wiring--torque converter/ brake switch--ECM/TCM. The problem may not be in the brakes circuit but in the torque converter sensors.

Oct 22, 2013 | Dodge Avenger Cars & Trucks

1 Answer

Diagram for wiring for break lights on rav4 1996


The AutoZone website may have a wiring diagram in the sites self help repair section.

If you have a voltmeter check for voltage and ground continuity at the bulbs. Check for voltage before and after the brake switch (operate the switch). If you don't have a voltmeter connect something up with a 12V bulb.

If you have voltage after the switch (when operated) but none at the bulb might check the brake/tail light sensor. This is the actual sensor box located in the trunk, drivers side. The sensor can fail resulting no brake lights.

There have been various posts at this forum on the sensor, suggest you do a site search to find these and review them.

But first start checking for voltage.

Apr 01, 2012 | 1996 Toyota RAV4

1 Answer

Car wont shift out of park


Car wont shift out of park, the most common reason for this is the brake light switch may be bad. have someone look at the brake lights as you step on the brake and see if they are working. the shifter release works off the power for the brake lights. if the brake light dont work then first check the fuses , if the fuses are good then you will need to check for power at the switch which is located at the top of brake pedal bracket, there will be wires connected to switch, the way it works is one wire will have power at all times and then when the brake pedal is pushed the power will flow through the switch to brake lights and also to shifter release, now if the power is not going through switch then replace the switch. another setup used is the tps sensor, im not sure but this year may use this setup, a bad throtle postion sensor will cause this problem as it thinks the gas pedal is pushed. this is a safety thing if the tps is out of range it will not allow the shifter to be moved, this would need to be checked with a scan tool to check the readings.

Jan 30, 2012 | 2006 Nissan Altima

1 Answer

Trying to fix 2002 Accord stuck in Park Problem and brake light failure. If you depress the brake far enough and with enough force, everything works ok. Can you do something to adjust it, or must the...


the brake light switch is either bad or needs replaced. when putting into park and taking it out, you have to press on brake to activate switch. it is located on back side of brake pedal. it should have a wire connector on it. that is why brake lights do not work also. have a good day !

May 12, 2011 | Honda Accord Cars & Trucks

1 Answer

The parking brake lights stays on and the dash board parking brake light stays on also makes horrible buzzing sound when driving. I big explanation mark in the driver display in the center of the counsel.


Possible problems are :

Low Brake Fluid.

Low Brake Assist pressure .( Some Models.)

Faulty Pad Warning sensors.

Brake sensor loom fault.

Faulty Park Brake Switch...or wiring.

Faulty Brake Switch.

Jan 12, 2011 | Audi A6 Cars & Trucks

3 Answers

Brake lights will not go off on 1992 Acura legend


this is caused by a defective or out of adjustment brake light switch, the switch is located under the dash and is actuated by the arm that the brake pedal is attached to, it has 2 or 2 wires coming out of it.

May 20, 2010 | 1991 Acura Legend

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