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.
SOURCE: Brake lights wnt wrk when pushing dwn brake, but park lights do
As cadman mention to check the fuse, and if there ok check your brake light switch along the brake peddle arm. Before you doany of that, turn your hazard light on to make sure that all your light's are not burnt out. Good luck
SOURCE: rear brake lights stay on all the time
CHECK BRAKE LIGHT SWITCH UNDER STEERING WHEEL TOWARD BASE OF BRAKE PEDAL.
SOURCE: 1994 chevrolet pickup - brake light problems
There will be an electronic flasher module located under your dash near the steering column (don't know it's exactly location as it varies). It sounds like this unit may be faulty.
SOURCE: 95' Buick regal, 3rd brake light works, tail
I dont have a diagram but the brake light switch has to feed the turn signal switch, Either that wire has a bad connection, or the turn signal switch is bad. Jiggle the turn signal lever and see if the brake lights try to work.
SOURCE: 2002 Hyundai Sonata brake lights stuck on.
There was a recall on hyundai sonata's for brake light switch. Call a hyundai dealership.
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