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Old 02-13-2019, 04:06 PM   #1
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All Tail lights come on when shifting to Reverse

2016 MBS 2401R. Anyone know why all tail lights would come on when selecting reverse? Just started happening. Also when turning head lamps or parking lights on the Backup white lights come on. Anyone have access or know where to go to get wiring diagrams for the FR Chassis part or the MBS connectors to the rear cabin area? MB blames, FR and FR says its MB. At a tug of war loss. I need wiring for tail lamp assy. It's not the Curt controller.
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Old 02-13-2019, 04:22 PM   #2
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Wiring diagrams for 2401R Tail lights

Anyone help on wiring diagram for 2016 MBS Forester 2401R wiring diagrams for the tail light assy and backup lights. MB and FR finger pointing. I have AC and DC cabin wiring diagrams but nothing for exterior lighting.
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Old 02-13-2019, 04:53 PM   #3
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I would take apart the 7 way outlet and look for stray wires or corrosion.
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Old 02-13-2019, 05:12 PM   #4
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I would take apart the 7 way outlet and look for stray wires or corrosion.
How would that help track down tail light issues in a motor home
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Old 02-13-2019, 05:16 PM   #5
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How would that help track down tail light issues in a motor home

My motorhome has a 7 way outlet at the rear. I have seen where a single strand from one wire, lets say reverse, is now touching the tail light wire. Put the shifter in reverse and now you have reverse lights and tail lights. Bad grounds do some crazy stuff also.
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Old 02-13-2019, 05:17 PM   #6
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My motorhome has a 7 way outlet at the rear. I have seen where a single strand from one wire, lets say reverse, is now touching the tail light wire. Put the shifter in reverse and now you have reverse lights and tail lights. Bad grounds do some crazy stuff also.
OK, got it. Just asking.
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Old 02-13-2019, 05:46 PM   #7
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I would take apart the 7 way outlet and look for stray wires or corrosion.
Yes sir took the entire assy apart no shorts and no frayed wires or corrosion, Thanks
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Old 02-13-2019, 05:47 PM   #8
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Also, try pulling the bulbs out of reverse socket and see if it still lights up tail lights. Seen crazy bulb stuff too
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Old 02-13-2019, 06:29 PM   #9
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There have been all kinds of issues with the taillights. It's important to note that the setup on these Sprinter motorhomes is pretty much different from any other vehicle. In particular, the taillights (and marker lights and backup lights and brake lights) are not driven directly by the Sprinter chassis. FR has installed a taillight control interface between the chassis and all those lights and the trailer plug lights as well. That's why a problem in the 7 way can be reflected all over the place.

Anyway, there have been problems with the controller module such that it was subject to recall a few years ago...and folks have still had problems with the newer controller. So it might be related to the controller. Or it might not. But, after the 7-way, that's probably where I'd start to look.

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Old 02-13-2019, 10:23 PM   #10
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There have been all kinds of issues with the taillights. It's important to note that the setup on these Sprinter motorhomes is pretty much different from any other vehicle. In particular, the taillights (and marker lights and backup lights and brake lights) are not driven directly by the Sprinter chassis. FR has installed a taillight control interface between the chassis and all those lights and the trailer plug lights as well. That's why a problem in the 7 way can be reflected all over the place.

Anyway, there have been problems with the controller module such that it was subject to recall a few years ago...and folks have still had problems with the newer controller. So it might be related to the controller. Or it might not. But, after the 7-way, that's probably where I'd start to look.

Dave


Thx, I have replaced the controller and same issue. I’m a 20 AE/AT aircraft electrician. I’m taking it to Mercedes dealer for them to check the chassis wiring and I’ll go from there.
Appreciate the help.
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