Why do my brake lights stay on while i am driving my mercedes 2002 430s
2002 Mercedes-Benz S430

Why do my brake lights stay on while I am driving my Mercedes 2002 430s

(2002 Mercedes-Benz S430)
Brake lights come on whenever the Ignition is on; motor running or not.
What seems to make the problem better or worse? Nothing changes
How long have you had this problem? Two weeks
Tags: mercedes benz, s430
2 answers & 4 comments
Popular Answer
on October 07, 2019

Then the brake lights should be on ALL THE TIME - - even while parked.
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on October 07, 2019

Brake light switch failure would be a prime suspect - switch always remains in the closed (ON) position.
on October 24, 2019
Tried everything: even went to Mercedes yesterday. They scanned and could only guess the ESP.
Exchanged new brake light switch with the one in wife's 430e. New one worked in hers; hers didn't work in my vehicle?
Defiantly not switch.
on October 24, 2019

Very unusual indeed.

Well I’m out of ammo.

Good luck with it!
General Diagnosis
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on October 07, 2019

Then the brake lights should be on ALL THE TIME - - even while parked.
Sign in to reply
on October 07, 2019

Brake light switch failure would be a prime suspect - switch always remains in the closed (ON) position.
on October 24, 2019
Tried everything: even went to Mercedes yesterday. They scanned and could only guess the ESP.
Exchanged new brake light switch with the one in wife's 430e. New one worked in hers; hers didn't work in my vehicle?
Defiantly not switch.
on October 24, 2019

Very unusual indeed.

Well I’m out of ammo.

Good luck with it!
on October 07, 2019
Hello, are you certain it's brake lights? Could it be the parking lights that are on? I don't know why brake lights could possibly correlate with the ignition being on or off. The circuit for brake light operation is independent of the ignition.
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on October 24, 2019
Absolutely; Tried everything: even went to Mercedes yesterday. They scanned and could only guess the ESP.
Exchanged new brake light switch with the one in wife's 430e. New one worked in hers; hers didn't work in my vehicle?
Defiantly not switch.
Don't know what to do next? Study the ESP module?

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