Why does my third brake light stay on

The Enhanced
Traction System
warning light may
come on for the
following reasons:


If you turn the system off by shifting to SECOND (2)
or FIRST (1), the warning light will come on and stay
on. To turn the system back on, shift to THIRD (3) or
AUTOMATIC OVERDRIVE (
). See “Enhanced
Traction System” in the Index.


If the Enhanced Traction System warning light
comes on and stays on for an extended period of
time when the system is turned on, your vehicle
needs service. Adjust your driving accordingly.


The warning light will come on when you set your
parking brake with the engine running, and it will
stay on if your parking brake doesn’t release fully.
If the transaxle shift lever is in any position other
than FIRST (1) or SECOND (2) and the warning
light stays on after your parking brake is fully
released, it means there’s a problem with the system.


If the traction control system is affected by an
engine-related problem, the system will turn off
and the warning light will come on.

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.

Dodge Charger 3rd Brake Light ' eBay

www.ebay.com/bhp/dodge-charger-3rd-brake-light

eBayFind great deals on eBay for Dodge Charger 3rd Brake Light in Tail Lights. ... Will fit:2011 - 2013 dodge charger. ... I swapped this out for the third brake light W/ backup camera so I no longer need this one. Item is .... There are three wires; positive driving / strobe flashing blinker mode, positive backup / brake light mode and ...Missing: deck

3rd brake light not working - Lx Forums

www.lxforums.com/board/...php/155947-3rd-brake-light-not-working

Mar 15, 2009 - 12 posts - ‎3 authors
i would try and test if you even have power at the 3rd brake light. that way ... work, the circuit is working up to S348 splice where it splits to left/right/CHMSL. ... You'll have to undo the rubber boot to examine the wire. ... 2011 Dodge Charger R/T Plus AWD- Redline - 5.7L Hemi Registry #1650 Tbird100636

its the brake light switch....have it changed and if that does not solve the issue, check the ground wire to the brake light

have alternator out put checked with engine running should be 13.5 - 14.5 volts.if alternator not faulty could have bad wheel speed sensor or wheel bearing failing.

sounds like a bulb is not seated properly in a socket in the back..check all the lights and groundwires too..starting with all the 4way flashers..then running lights.

check back lights wire crossed or bulbs faulty

1) Locate and remove sensor.
The sensor is located under the drivers tail light. Unclip it from the body and then unplug it.

2) Bypass the tail light circuit.
Connect the tail light signal wire (Green) to the tail light wire (Green w/ Red Stripe). I recommend using wire tap in squeeze connectors that way you dont have to cut any wires.

3) Bypass the brake light circuit.
Connect the brakelight signal wire (Green w/ White Stripe) to the brake light wire (Red w/ Blue stripe) and the the 3rd brake light wire (Red w/ White Stripe). Again all three of these wires are to be connected together.

4) Throw away your broken Tail Lamp Failure Sensor
Do not plug your sensor back in. Doing so will cause the annoying orange lamp failure warning light on your dash to stay on. Leave it unplugged ant the light will stay off.

5) Test your work
Turn on your lights and make sure your tail lights work properly. Have a friend step on the brake pedal, and make sure your brake lights work properly as well. Dont forget to check the Third brake light.

If the brake light switch above the pedal was sticking, then all three brake lights would be staying on.
If it is only the axillary third brake light, than that is a bit unusual.
I am trying to image things like current being wired to the lights first and grounding at the switch. Then if the wire from the 3rd light was squashed and shorting, it would then only effect the one light.
But this is unlikely.
I would suggest removing the wires from the brake light switch, to see if it goes out then.

There will be a switch on the the brake pedal. Gently move it back and forth. If the lights stay on this will have to be replaced. Then replace the third brake light bulb.