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I had troubles with my BCM, so I had to replace it with a used one from a CX9 2010, I had checked and serial numbers were equivalent, when installed everything worked fine.

But when I tried to go into programming mode for the remote Keyless, the BCM does not entry to programming mode, I followed this steps:
1: Open driver side door and leave open.
2: Lock and Unlock the drivers door using the power door lock switch on the door
3: Insert key into the ignition.
4: Turn Key to ON position and return to Lock (off) position. Do this 3 times within 10 seconds. LEAVE key in the ignition in Lock (off) position.
5: Close and open the drivers door 3 times. Leave door open after this step
6: ECU should respond by locking and unlocking the doors once. ** THIS DOES NOT WORK *

I did the following: 2010 Mazda CX 9 - Remote Keyless Entry can't program - FORScan forum and did not work for me.

Any suggestions? Please help!
 
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