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Why are there no brake lights or high-level stop light?

When I press the pedal no brake lights or 3rd light all other lights work I checked the fuses all are good in and under the hood

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04 malibu ls 3rd brake lite rear lite stay on when 3rd brke light is plugged inbrake lights wont get brighter when brke pressed If 3rd brake lite is unplugd brke lights work unplugged 3rd brake light


Do you know anything about automotive electronic's ? The brake pedal position sensor is a input to the BCM - body control module ,the BCM turns on the stop lamps . Possible short in the (CHMSL ) - center high mount stop lamps , wiring etc.... Causing problem inside the BCM . Do you know what wiring diagrams are ? Free one's here http://www.bbbind.com/free-tsb Enter vehicle info. year , make , model an engine size . Under system click on lighting , then under subsystem click on exterior lighting . Click the search button then the blue link's . First diagram show's the brake pedal position sensor input to the BCM ,lower right . Second diagram show's BCM power supply to the third brake light (CHMSL) . Having a qualified repair shop with a professional scan tool to check for DTC'S - diagnostic trouble code's could save a bunch of time in diagnosing the problem .
DTC B3903
The body control module (BCM) supplies voltage to the center high mount stop lamp (CHMSL) and the powertrain control module (PCM) when the stop lamps are active.
DTC B3903 Stop Lamp Relay Circuit

Stop Lamps
The body control module (BCM) is responsible for controlling the stop lamps. When the driver presses the brake pedal, the BCM will receive a signal from the brake pedal position sensor. The BCM then supplies battery positive voltage to both left and right stop lamp assemblies and to the center high mounted stop lamp (CHMSL). The stop lamps are grounded at G401 and G403. The CHMSL is grounded at G302.

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1 Answer

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Did you check STOP LP fuse 15amp. in the rear fuse block ? Do you know where this is. Fuse Block - Rear Under the rear seat, on the left side of the floor pan.
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Did you check for power at the stop lamp switch ? both in an out of the switch with brake pedal pressed ?
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Brake lights went out so I changed a blown fuse,now the brake lights wont shut off,so I replaced the brake switch at the pedal and still have the same issue,lights wont go off.


Which fuse did you replace ? The one in the under hood fuse box or one of the two in the I/P fuse box . Do the CHMSL - center high mount stop lamps work correctly ? Here is a description how they work .
Stop Lamps
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Why doesn't the high level brake light work?


High level brake light is connected , in parallel with, all other brake/stop lights.. It is not on a separate fuse, so, check, or replace the other stop lights.
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1 Answer

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Check fuses first. Should be a fuse labeled 'Stop' or 'Brake'.

If fuses are good, climb under the dash and look at the brake switch, it's high up on the brake lever. Make sure it is operated by pressing in the brake pedal.

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On a 1999 ford f 250 where is brake lite fuse located in fuse bo x


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