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Old Dec 9, 2015 | 02:44 PM
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Question Trunk Connection Question
Greetings all:

New member here. Former Lexus owner and now a proud MB owner

Just curious if anyone knows what these wires are. (Pls. refer to the attached photo) Any help is greatly appreciated. Thanks in advance.
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Old Dec 9, 2015 | 02:53 PM
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Trunk lid CU
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Old Dec 9, 2015 | 03:15 PM
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Awesome! Thanks for the quick reply konigstiger. You don't happen to know where the wiring for the 3rd brake light are located do you?
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Old Dec 9, 2015 | 03:49 PM
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Rear shelf
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Old Dec 9, 2015 | 04:02 PM
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I have a 2014...not quite that easy.
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Old Dec 9, 2015 | 08:09 PM
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Originally Posted by Tiggerr
Awesome! Thanks for the quick reply konigstiger. You don't happen to know where the wiring for the 3rd brake light are located do you?

I took the rear shelf apart and if I remember correctly the third brake light wiring runs up under the back seat right side bolster. Two wires together but my car is a 2010 model so it might be different on yours.


What are you planning to connect to it? If the light is out your warranty should cover it.
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Old Dec 9, 2015 | 10:19 PM
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Originally Posted by Arrie
I took the rear shelf apart and if I remember correctly the third brake light wiring runs up under the back seat right side bolster. Two wires together but my car is a 2010 model so it might be different on yours.


What are you planning to connect to it? If the light is out your warranty should cover it.
I just need to tap on to the wires to install a device to make it flash 3 times when you hit the brakes. Too many inattentive drivers in SoCal busy with texting & on the phones.
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Old Dec 9, 2015 | 10:22 PM
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If possible I'd like to avoid taking the assembly apart. I just need where the wires run so I can install it from there.
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Old Dec 10, 2015 | 04:54 AM
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Originally Posted by Tiggerr
If possible I'd like to avoid taking the assembly apart. I just need where the wires run so I can install it from there.
In my car the bolster comes off by just pulling it up. The two wires are a flat cable and the harness may also be there. Not sure about this now...can't remember...
Last edited by Arrie; Dec 10, 2015 at 04:56 AM.
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