3rd brake light not working - 1995 Subaru Impreza

There are several possible reasons why the 3rd brake light on your 2005 Chevy Malibu works only with the key in the accessory position and not when the car is running.

1. The brake light switch: The brake light switch is responsible for turning on the brake lights when the pedal is depressed. If the switch is malfunctioning, it may not be sending the signal to the brake light when the key is in the "on" or "start" position.
2. Electrical issue: An electrical issue with the wiring or a connection in the brake light circuit could be preventing the brake light from turning on.
3. The Body Control Module (BCM): The BCM controls various electrical functions in the car, including the brake lights. A malfunctioning BCM could prevent the brake light from turning on.
4. The Brake Light Relay: The relay could be defective and not allowing power to reach the brake light when the key is in the "on" or "start" position.
5. The code PO573 that is coming up is related to the brake light switch, it could be a symptom of the problem.
6. The cruise control not working can also be related to a problem with the brake light switch.

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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

The 3rd brake light does not flash with the flashers. It works independently and only with the brake pedal. Have someone step down on the brake pedal while you check to see if the light comes on.

the center and brake light are not on the same circuit, check voltage coming from the switch

Hello, Well there is not much more it could be unless you have a shorted wire or a burned fuse. I would normally think that the turn signal canceler was bad but the 3rd brake light will still work if that is bad so I would check all fuses and for bare or shorted wires.

The 3rd brake light working does reveal that the fuse is good, and the brake switch is good. Check the bulbs, sockets, and the wiring between the brake lights

THE 3RD BRAKE LIGHT DOES NOT GO THROUGH THE TURN SIGNAL SWITCH.ASSUMING THE 3RD BRAKE LIGHT BULB IS GOOD.U SHOULD CHECK THE BRAKE LIGHT SWITCH ON THE BEAKE PEDAL.SHOULD BE POWER GOING IN & POWER OUT WHEN U ARE IN THE BRAKE

If your third brake light is working, then we know it is not the brake switch. Get a test light and check to see if you have power at the light socket. If power is present possible bad ground. If no power, check connections inside of the trunk. Also choose a spot just behind the back seat to be sure that power is on the brake light wire, this will check for possible break along wire.

check the fuse for the stoplights. Even though the 3rd one is working it should be on a different fuse. With both of them not working even after you changed the bulb it would seem to lead to a fuse.

do you have a 3rd brake light like on that is on the roof or in the rear window? if so does it work?
the brake lights are usually a 2way bulb so just because the lights work doesn't mean that brake lights will. if the 3rd brake light works replace the brake light bulbs if none of them work including your 3 brake light. check into having your brake switch changed. that is the switch under the brake pedal. when it is pressed the brake lights come on and when released they go off. if the bulbs do not fix the problem than try the switch.