BCM swap using Forscan..?

[Tenacious_Ste]

I have a problem where our vehicle (2016 S550 GT Premium 5.0) has stopped responding to the key fobs.
It starts when a fob is placed in the cup holder but we can't lock / unlock the doors or start the car with the key in any other location.
I originally thought it might be a faulty RTM but I replaced this and the problem is still there.
Now I believe it's a faulty BCM and I've managed to obtain a cheap used one.
My question is, can I swap over the BCM and code the new one to the car using just Forscan?
I know I have to reprogram the fobs and copy over the as built data from the old BCM to the new one, but is there anything else I'll need to do and can it all be done using Forscan?
Sorry for the long post...

TLDR: can I replace my BCM using Forscan?

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[WildHorse]

Should really ask in the forscan forums.

 

[dirtwarrior]

change barrerier in fob

 

[Tenacious_Ste]

change barrerier in fob

First thing I tried

 

[Mike Pfeifer]

change battery in fob

I assume that first diagnostic step was done, but I guess you never know!

 

[Tenacious_Ste]

All sorted now but I thought I'd update the thread in case someone else has the same issue. The following may help...

Upon removing the fuse box (BCM) cover and the kick panel next to it, I could see that there had been some water ingress at some point (probably through a dodgy door / window / bulkhead seal), there were a couple of rusty brackets and some rusty water stains on some of the connectors.

To the right of the BCM there's a big multipin connector...

This was right underneath the rusty bracket. When I disconnected it I could see that at least two of the pins had corroded through and snapped off...

I thought about sourcing a new connector block (and still might) but for now I just cleaned up the rest of the pins and sockets as best I could and used a couple of scotch blocks to run bypass wires from one side of the connector to the other.

Reconnected the battery and hey presto, everything is back to normal.
I've taped a plastic bag around that connector to keep it from getting wet again and at some point I'll have a go at locating and fixing the leaky seal.

Hope this helps someone

 

[Buldawg76]

You need to install the rubber plugs from the TSB 22-2242 in place of those paper sticker between the door hinges that peel off allowing water to leak inside the vehicle footwell area.

BD

 

[Tenacious_Ste]

You need to install the rubber plugs from the TSB 22-2242 in place of those paper sticker between the door hinges that peel off allowing water to leak inside the vehicle footwell area.

BD

Thanks for the tip. Just checked and ours still has the paper ones, so that's the next job on the list

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