2014 VW Beetle Turn Signals Inoperative Park Lamps On (PART II)

Michael Mobile Technician Utah Posted   Latest  
Case Study
Electrical
Programming
2014 Volkswagen Beetle GSR 2.0L (CPPA) 6-spd (02Q)
Park Lamps On
No Signals

So a while back I posted my bench testing of the BCM / CCM in this pesky Beetle. I have been going back an forth to customer location spending as much time as I could to figure out this mystery. The park lights are always on and no signals. I also have no comms with anything but the vehicle starts. After confirming that the original, new and used BCM / CCM will communicate on the bench (Part I of this Case Study), I went to the connections and started to check powers and grounds. I found two powers that should be lit that were not. I also found a ground that was open. I kept on going down this rabbit hole deeper and deeper. The fuse #46 was good that feeds these two powers but the power is not getting to either. Plus the wire colors do not match. I got the OEM wiring diagram and it matched the aftermarket diagram. PIN #38 on connector B shows a Brown wire and ground. Again, the wires don't match.

After hours of testing. Back and forth, I had a thought. What if the jackets that have the levers on them are swapped? One is Black, the other is White. They are keyed differently so you can't mix them up. However the inner connectors are identical in design and pins. I open up the black connector and guess what? The wire colors match what should be in the white connector. I released each connector jacket and swapped them. Now the wipers are working, the signals work, the park lights are out. Windows roll up and down, door locks work.

At some point before being sold at auction the two jackets got swapped. I had to recode the BCM/CCM so either it was brand new and could not be coded due to no comms or lost it's coding due to internal shorts or lack of power? Anyway so glad to get this one off my mind. It seems more and more often the solution is a matter of undoing something another has broken.

diag​.​net/file/f3b15b5al…

+26
Interesting
Helpful
Thanks
Tim Technician
Pennsylvania
Tim
 

Nice detective work Mike. Man made problems defy rules of logic because man is not logical when he makes problems

+6
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Agree
Funny
Cody Mobile Technician
Arizona
Cody
 

Great work Mike!

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Bob Technician
Massachusetts
Bob
 

Man made is always the worst. The symptoms typically won't follow any known or logical fault pattern.

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Agree
Matthew Diagnostician
Kentucky
Matthew
 

Auction says it all

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Tony Owner/Technician
Missouri
Tony
 

Wow, it's amazing anything worked at all, and that more stuff didn't get ruined from swapping two large connectors like that. Whoever mixed them up was lucky enough (or the vehicle owner is lucky enough) he didn't damage terminals in the process. I can only imagine the butchery at play to result in this outcome.

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Justin Mobile Technician
Utah
Justin
 

You are the man.

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Michael Technician
Indiana
Michael
 

I often see auction cars sabotaged. If these connectors are not hard to get to, I would be inclined to believe this was intentional. While in the yard looking at the cars guys will pull fuses, disconnect coils, unplug evap sensors. All in the hopes of getting the car cheaper.

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Agree
Scott Owner
California
Scott
 

Hi Michael, A used car dealer that occasionally shows up here calls them, “auction pirates.” I've had a few of his cars have “installed faults.”

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Noah Technician
North Carolina
Noah
 

Awesome work Mike! Gotta love it when someone makes your life more difficult!

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