SL-Class (R230) 2003 -- 2012: Discussion on the SL500, SL550, SL600

SL/R230: 3rd Brake Light Warning

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Old 06-21-2021, 11:03 PM
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2003 Mercedes sl500
3rd Brake Light Warning

I recently replaced my original 3rd brake light with a new smoked light. Once I finished and started the car I received a 3rd brake light warning? Is this normal.
Old 06-22-2021, 07:30 AM
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'03 SL55 Black, '03 SL500's Aegean, Mars Red, Tazanite, Alabaster, '11 S550 Flint Gray
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Old 06-22-2021, 07:49 AM
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SL 350 R230 (3.7L with AMG Speedshift autobox)
try seeing if it clears after a few starts of your car, usually if the car see's that the fault is no longer there after about 3 times, it will automatically clear the fault.
P.S Does it work? is it plugged in well and was the plug dry?
Old 06-22-2021, 08:28 AM
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2003 Mercedes sl500
Thanks, yes it is plugged in fully and was dry. It works great so I will try to cycle the car a few times. If it doesn't go away maybe see if the dealer will clear it?
Old 06-22-2021, 09:19 AM
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SL 350 R230 (3.7L with AMG Speedshift autobox)
Originally Posted by Trem816
Thanks, yes it is plugged in fully and was dry. It works great so I will try to cycle the car a few times. If it doesn't go away maybe see if the dealer will clear it?
you could go to dealer, or just buy an icarsoft or similar, it will pay for itself after a couple of uses !
Old 06-22-2021, 09:53 AM
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I think all of the light malfunction warnings are self-clearing. It is most likely an issue with resistance/current draw being out of the expected range, probably because of the new light. You can clear it, but it will come right back.

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