I do not know where the receiver is, but if you check older posts of keyless cars, you will find out that they end up in the dealer changing some expensive part. So you may not be able to just swap a bit of a box and make it work and it needs more work on it. The common pattern was t have a red key symbol and the car not starting. There is an earth wiring inside one of the wings that once checked that it works properly, brought the car back in life but if you think this is not the problem and need to work on the receiver, maybe the other posts from the dealer operations could help.