Can I get wiring diagrams for Blind Spot, SRS, Turn Signals and Cruise Control

Tiny
SPEEDRACER3
  • MEMBER
  • 2012 MERCEDES BENZ R350
  • 3.0L
  • V6
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
I have a random sporadic inop of blind spot, turn signal and cruise control, as well as SRS fault. I can't connect scan tool because DLC is inop as well. The fuse seems fine but clearly something is taking down the CAN network. I found water in the trunk from a worn out seal and found corrosion on the fuse/relay panel on the trunk floor. However, I don't see any real damage and the wiring was taken apart and cleaned. I suspect it may have affected other controllers (i.E. The SAM(s)). I did not see any obvious signs of damage or corrosion on the rear SAM or front SAM.
I am trying to see what is common on these systems to narrow down the search.
Monday, December 23rd, 2024 AT 9:25 AM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,389 POSTS
We are working blind without the DLC working so we should concentrate on that first. Lets check fuse #58 7.5 amp with the ignition system on to see if the fuse has power. This guide can help

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Both brown wires on the DLC need to ground as well. Here is the wiring diagrams so you can see how the connector works. Check out the images (below). Please let us know what happens.
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Tuesday, December 24th, 2024 AT 11:22 AM
Tiny
SPEEDRACER3
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  • 20 POSTS
I've already checked that. That was the first thing I did. I have power and fuse is good. But I will use these diagrams to check everything at the DLC - power, ground and Bus voltage levels (this will also tell me if there is a faulty node taking down the network).
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Tuesday, December 24th, 2024 AT 4:42 PM
Tiny
SPEEDRACER3
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But I know for a fact I have multiple systems affected and I suspect it's from water ingress (again). If I want to see where these systems are controlled from so I can find common point to inspect.
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Tuesday, December 24th, 2024 AT 4:43 PM

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