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Brake lights always on, switch not at fault.

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Old 19 Jul 2013, 12:31 pm
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Default Brake lights always on, switch not at fault.

Okay, so there's this 08 PT that's giving me a migraine, and I need help.

When the ignition is off, the brake lights work normally. Switch is fine. However, turn it on, and the high power filaments blaze to life and stay on, even if I pull the switch out and toss it ten feet from the car. ACC, On, both of these cause the brake lights to stay lit.

Whiskey...Tango...Foxtrot. Any suggestions?
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Old 19 Jul 2013, 12:55 pm
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Default Re: Brake lights always on, switch not at fault.

I was about to get out my schematics and check the wiring to see where power to the brake lights might come from which might have failed but then I saw again that you said you had an 08, the second generation with the CAN-BUSS electrical system. Can't help. Hopefully somebody who understands the newer system and has updated information will come along and help.
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Old 19 Jul 2013, 01:39 pm
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Default Re: Brake lights always on, switch not at fault.

My first thought would be to unhook the battery for ten minutes. Press the brake pedal a few times with it unhooked to get rid of any residual power and then hook it back up. This will reset the TIPM.

I would start there. My guess would be a TIPM problem as for some reason it is energizing the circuit with the key on. When I read it my first thought was the brake light switch but you said you checked that.
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Old 19 Jul 2013, 10:52 pm
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Default Re: Brake lights always on, switch not at fault.

Are you saying that you have removed the brake light switch from the pedal assembly?
If so, you may need to buy and install a new switch. This is what the shop manual says in 2004:

"CAUTION: The switch can only be adjusted once.
That is during initial installation of the switch. If the
switch is not adjusted properly or has been
removed for some service, a new switch must be
installed and adjusted."

Originally Posted by Groundless View Post
...even if I pull the switch out and toss it ten feet from the car. ... Any suggestions?
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