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3rd brake lamp: was yours dead or intermittent?

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Old 06-11-2018, 09:47 AM
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CLK 550
3rd brake lamp: was yours dead or intermittent?
I get the message every now and then. I have stood at the back of the car while a helper mashes the brake pedal and sometimes it lights while other times it doesn't. Mine is not cracked. I don't know the history of trunk slams by POs. My situation seems like a bad connection. Do connections go bad in the assembly or the wiring leading up to it? What were your symptoms?
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Old 06-11-2018, 02:58 PM
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Mine did this and so I removed it and separated the lens,expecting to find some broken wiring or bad solders. I found nothing. I thoroughly tested each LED and all wiring, put it back together (using silicone sealant to reattach the lens) and all was well. Note that the bracket should not be over-tightened. It just needs to be torqued enough to hold the light in place. Otherwise, it can put stress on the assembly and cause failures.
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Old 06-13-2018, 07:52 AM
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15' CLS400
Replaced mine.. I'm pretty sure many of us on here have had to replace it. Easy job.
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Old 06-15-2018, 09:16 AM
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The sensor on mine is intermittant. Light works.
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Old 06-15-2018, 08:11 PM
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Originally Posted by TechSuperstar
Replaced mine.. I'm pretty sure many of us on here have had to replace it. Easy job.
+1. I've had the intermittent 3rd Brake light error and I replaced it with a new one. Problem solved.
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Old 06-17-2018, 11:35 AM
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CLK W209
Both my CLKs have been fine with the 3rd brake light. Don’t wish to jinx myself however.. it would drive me mad, knowing it looked crap. I do see a few Benzes on the road with failing clusters though.
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