BCM Swap?

Tiny
RANDY MULLIN
  • MEMBER
  • 2007 FORD TAURUS
  • 3.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 50,000 MILES
Suspect faulty BCM. I want to swap it with a used BCM from a similar vehicle. I want to know if there is some required programming necessary. The car has an anti-theft chipped key. Will that need to affect by this swap?
Wednesday, April 12th, 2023 AT 9:41 AM

3 Replies

Tiny
STEVE W.
  • MECHANIC
  • 13,465 POSTS
For that vehicle you will need a scan tool to be able to swap the module. Basically you need to read the configuration data from the current module and then transfer that into the replacement module. Without that ability the module will not allow the PATS system to disable the immobilizer and the engine won't run. What is the issue you suspect the BCM for?
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Thursday, April 13th, 2023 AT 6:44 AM
Tiny
RANDY MULLIN
  • MEMBER
  • 2 POSTS
Thank you for the reply. Any additional information on that scan tool and how to use it would be appreciated. The car was flooded by hurricane Ian. The driver's side window had somehow rolled itself down during the storm. The car runs and water did not get into the engine, but the power windows and the instrument panel do not work. I suspect water got to the junction box. I've checked all fuses and F2.11, F2.12, F2.15, F2.16, F2.19 F2.31, F2.35, and F2.36 have no voltage on either side of the fuse. I've replaced the power window relay and accessories relay but did not fix it. I bought a wiring diagram book and while I am no expert, it seems the issue is with the "Low Current Board" of the Smart Junction Box. I also suspect corrosion in the wiring that connects the Battery Junction Box under the hood of the car and the Smart Junction Box. There are three plugs identified as C2280a, C2280b, and C2280c that seem to be associated with the dead fuses. I plan to take the Smart Junction Box out, clean the connections and see if there is any corrosion in the SJB/BCM I might be able to clean up. I see used BCMs on Ebay and just wondering if that would be an option. Thanks again for your help.
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Thursday, April 13th, 2023 AT 1:57 PM
Tiny
STEVE W.
  • MECHANIC
  • 13,465 POSTS
Your plan sounds good. I would plan on replacing the SJB myself, If it's the style Ford commonly used you are going to discover they used press in terminals and wires instead of circuit traces and soldered connections and it doesn't take much to make them corrode or the wires to fail. With the number of fuses, you have out it is probably a couple of circuits. There are videos online about the way they are made and repaired.
Scan tool wise I have a few that work to do this type of repair. Most of them do this in the same way, you plug them in, pick the system you are working on and then go into the module itself and then follow the prompts, in this case it's to plug in the tool, read the as built data, then remove the module. Install the replacement and use the tool to write the as built data into that module. My latest "toy" is this one. So far it seems capable.

https://mythinkcar.com/diagnostic-tools/5-49-thinktool-pro-series#/27-version-thinktool_pros

It's a bit much for a DIYer unless you want to be able to handle pretty much any diagnostic item on the vehicles around you.

I tend to refuse working on flood cars because you chase endless electrical problems in them. I got a "great deal" on a Buick flood car years ago. Ended up gutting the interior and taking every connector in it apart to clean and add dielectric grease to them, then doing the same to the rest of the harness under the hood. That was before all the modules took over.
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Thursday, April 13th, 2023 AT 10:52 PM

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