BCM issue - LH Rear Turn Signal not working......Wire is dead at lamp!

[Piper5314]

Hello all,

My first post, but I need some guidance. Just bought a 2010 Freightliner Sprinter Forest River Solea, with 9,000 miles. Discovered that I have no turn signal on LH rear. Front works fine, Inside works fine, no fast flashing on the dash. I pulled the LED rear lamp, to check connections, and found the circuit wire dead. I read that everything is controlled thru a BCM in the LH drivers footwell.

Does anyone have a print on the circuit for this LH Turn Signal and BCM?

Thanks in advance!
Marty

 

[autostaretx]

If you have Trailer Tow electronics, the module for that could be messing things up.

The NCV3 has (too) smart electronics driving the tail light circuits ... if it thinks there's a short-circuit, it will *not* feed power to that socket.
(it may also not-feed what it considers an empty socket (such as an LED), but i think it just reverts to fast-blink in that case)

--dick

 

[autostaretx]

2007 service documentation, with *two* renditions of the wiring (one MB, the other 3rd party)
This package still applies 99.5% to the 2010 model year.

http://www.diysprinter.co.uk/reference/2007-sprinter-service-information.pdf <-2007 MB service manual
http://www.diysprinter.co.uk/reference/2007-sprinter-wiring-information.pdf <- MB wiring diagram from above
http://www.diysprinter.co.uk/reference/2007_Wiring-sprinter-2500.pdf <-- 3rd party wiring diagrams
(As for the service manual: it is probably describing the wrong engine. But the body and brakes should be correct.)

--dick

 

[Nic7320]

It's unlikely a problem in the BCM. Forest River RVs have a LED driver board hidden in the back. Mine was mounted behind a panel above the wet bay. It failed after prolonged dampness in the PNW, and when I pulled it out, it had a chalky haze on the circuit board.

Cleaning it with isopropyl alcohol fixed the board, but my Bargman LED taillights still had some LED clusters out. I removed the taillamps and found them to be potted in resin, so they were unservicable and got replaced.