Hooking Up Trailer Lights without module
Thread Starter
Junior Member
Joined: Sep 2013
Posts: 49
Likes: 1
2006 CLS500, 2005 S430, 1998 SLK230
Hooking Up Trailer Lights without module
I have a 2007 GL450 that didn't come with the tow package so I got am OEM tow hitch and installed it on my GL but now I'm trying to figure out how to wire up the trailer plug for the trailer lights. I know GL's with the OEM package came with a module to control the trailer lights but is there a way to just splice the plug wires in power, brake, ground, and turn signals?
Senior Member
Joined: Aug 2018
Posts: 418
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From: Kelowna, BC
08 GL320 CDI
Super Member
Joined: Nov 2017
Posts: 558
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From: San Francisco Bay Area
2006 R500
I have a 2007 GL450 that didn't come with the tow package so I got am OEM tow hitch and installed it on my GL but now I'm trying to figure out how to wire up the trailer plug for the trailer lights. I know GL's with the OEM package came with a module to control the trailer lights but is there a way to just splice the plug wires in power, brake, ground, and turn signals?
Check your rear SAM version. If you have a newer version, all you need to do is get the OEM harness, plug it into your rear SAM, and enable trailer detection in the central gateway and rear SAM with Xentry (any indie with Xentry should be able to do this).
