Caution on FCA Vehicles — Disconnecting the Battery

Matthew Diagnostician New York Posted   Latest   Edited  
Case Study
Network Communications
Electrical
2016 Fiat 500X Sport 1.4L (H EAM) 6-spd (DE1-C635)
Lin
Can
Fca

BEFORE YOU DISCONNECT THE BATTERY ON A (FCA) FIAT VEHICLE

Starting in 2014 to present Jeep, Dodge, Chrysler, and Fiat vehicles using electrical/electronic architecture called next-generation. Data transmission between the various ECU's in the next-generation architecture occurs through the following digital networks. CAN-C1 (high-speed 500 kb/s) CAN-C2 (high-speed 500 kb/s) CAN-BH (medium-speed 125kb/s) and 4 lines of LIN bus communications. 

When disconnecting the battery on vehicles like Jeep Cherokee, renegade, fiat 500 and so on, you will have to perform a BCM proxi configure alignment routine. Failure to perform this special function will result in some vehicle to have ABS traction control light to be on in the electrical cluster and the vehicle's odometer to start blinking and even not being able to shift the transmission out of park. After the battery is disconnected on these type's of vehicle that use this next-generation architecture, modules need to re-hand shake with the BCM (MASTER OF THE PROXI CONFIGURATION DATA) for proper vehicle operation. 

Using a Autologic Drive pro scan tool captured a P1500-00 ECU configuration mismatch in the TCM module after the battery was replaced in a 2016 FIAT 500X and customer stated after battery replacement that the vehicle now does not shift out of park. On a battery disconnect the TCM lost its proxi alignment to the BCM and when proxi alignment configuration is performed vehicle will operate as designed and all configuration mismatch dtc's will and should clear out.

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Albin Diagnostician
Washington
Albin Default
 

What is the logic behind functions this being deeded? Maybe its my age showing, although I can't see a need for things like this to be built, unless your goal in life is to make things as complicated as possible.

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James Diagnostician
Georgia
James Default
 

Agreed

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Justin Mobile Technician
Utah
Justin Default
 

I have seen this on a Jeep Renegade I think it was a 2015 if I remember right.

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Rudy Technician
California
Rudy Default
 

I wonder how a customer is supposed to approach this?

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Marlin Technician
Oregon
Marlin Default
 

Yeah, really. Someone needs to review some owner's manuals. It's going to be fun for the AAA drivers who replace batteries. Of course, my suggestion is "Don't buy one".

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Brian Owner
Ohio
Brian Default
 

Thanks for the info! I have seen a few of these newer vehicles with the flashing Odometer, and the proxi alignment has always taken care of it. I was never quite sure of what caused the problem and it was usually action vehicles so I did not dig to deep.

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David Owner
Georgia
David Default
 

Would this also need to be done if the battery went dead and the cables were not disconnected? I would expect so.

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Matthew Diagnostician
New York
Matthew Default
 

of course. battery dead. or battery disconnected from the vehicle.

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Nelson Diagnostician
North Carolina
Nelson Default
   

Thanks for the heads up warning. I must have dodged " a bullet" on these so far but I also try to use a memory saver when doing battery replacement/service. Are there any aftermarket scanners (Autel or Launch) that can perform the BCM Proxi configure alignment or is this limited to FCA tools only?

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Matthew Diagnostician
New York
Matthew Default
 

autel probably your best chance for a aftermarket scan tool. but the best is witech 2.0 aftermarket using a j2534 pass threw device. like a snap on pro 4 or a cardaq plus 3

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Interesting
Mike Technician
Georgia
Mike Default
 

Any chance of Snap On being able to do this, or is it going to be like everything else and "coming soon, just keep buying updates"?

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David Mobile Technician
Wisconsin
David Default
 

I have seen a lot of these fca vehicles with the flashing odometer. I’ve also seen where they don’t shift right, multiple warning lights on the dash and also once the vehicle starts moving down the road, the vehicle starts to beep an alarm and the cluster display says key not found in vehicle, or something like that. Even though the key is in the vehicle. The proxi alignment has always taken

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Steven Diagnostician
New York
Steven Default
 

Snap-on does cover this function.

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Matthew Diagnostician
New York
Matthew Default
 

Nice did not know that. What version of snap-on scan tool?

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Steven Diagnostician
New York
Steven Default
 

Matt This was with 19.2 but I think it was there earlier

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Phillip Diagnostician
Ohio
Phillip Default
 

Thanks for the info keep a look out

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Benjamin Diagnostician
Tennessee
Benjamin Default
 

I ran into this today on a 2015 Chrysler 200 At a used car lot. The engine was replaced by another shop. This vehicle would not shift, and once the vehicle was started the vehicle would not shut off. After performing a full scan it was obvious a Proxi alignment was needed. I attempted the process with an Autel 908p first just to see if it would do it. I ended up getting a message saying “this…

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Gail Technician
North Carolina
Gail Default
 

Common for our guys to leave car running when swapping batteries...I get nauseous when they do that. "But that the way we've always done it" is the response.

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Albin Diagnostician
Washington
Albin Default
 

You must have a bunch of really really old guys working in your shop,,,,,, or a whole bunch of young untrained people working there.

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