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Will not start after battery was installed backwards?

Tiny
TOM MILSTER
  • MEMBER
  • 2012 VOLKSWAGEN PASSAT
  • 2.5L
  • 5 CYL
  • 2WD
  • AUTOMATIC
  • 80,000 MILES
I replaced the muti-fuse and three other fuses that were blown. Fuses in the passenger compartment were all good. The relays in the engine compartment fuse box were good. After reattaching battery cables in correct orientation, there is a few minutes of clicking noises and various warning light displays on the instrument panel. Then, the instrument panel goes dark. At one point, the instrument panel shows 'key fob not in range', although it was next to me in the driver's seat. The engine doesn't turn when pressing the start button. What do I need to check/replace next?
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Monday, November 4th, 2024 AT 2:45 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
The first thing I would do is a CAN scan which will tell you which modules are not working. Here is a video to show you how.
You can get a CAN scanner (Controller Area Network) which will work on most cars from Amazon.

here is a video to show you how:

https://youtu.be/u-4syLc-ifQ

Here is a guide that can help as well:

https://www.2carpros.com/articles/resolving-reverse-battery-connection-in-cars-a-step-by-step-repair-guide

You might have shorted out the access/start authentication module or the instrument cluster. Please go over these guides and get back to us.
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Tuesday, November 5th, 2024 AT 11:13 AM

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