Yeah I thought engine disabled was the fault requiring the EKA code.
Are the keys coded to the ignition? If so I'd imagine it would require plugging into diagnostics to code the key. But how could it loose the sync? He said he'd drove it to the shop then come out of shop and had this problem
Thanks. Shaun
Are coded, but diagnostics not needed to resync the keys
They are synced to the BeCM inorder to open the door locks and mobilise the engine, this sync is carried out using a rolling code that is transmitted to the key each time you unlock the car...if the batteries die the key needs to be resynced to the car, either by locking and unlocking the car using the mechanical key and pressing the buttons, or with the later models, the Passive Coil in the ignition barrell, which tells the key to resend the code to the RF receiver.
The rolling code stored in the key can get confused, if the buttons are pressed repeatedly away from the car, as the rolling code changes on each button press...you get a certain number of button presses before the rolling codes sync between the BeCM and the key are lost and a resync is required...
There is also the BeCM to Engine ECU sync which on the petrols has a tendancy to get corrupted and require resyncing using diagnostics or a syncmate...
This is a 4 digit code stored in the BeCM and Engine ECU...when you put the key in the ignition, and turn to start the engine ... the BeCM and the Engine ECU 'handshake' and compare codes, if they are the same, happy days, if not, the engine will not start....
This is to stop people from breaking into you car and the swapping out the BeCM for another which they have keys coded to....as the Engine ECU code will be different and not allow you to start the car....obviously, the introduction of the Syncmate and home user diagnostics has rendered this security measure useless now!
