Anyway i have in my possession another coil cause this is the first thing i thought of so i ordered exactly the same model '245 coilcraft' model no trace of damage or such.īut if I summarize correctly there are 4 main electronic parts: the transmitter, the transponder, the HF module, and the coil it's weird i don't see that many 'active' electronic parts on the board. because it is quite exposed on a 0523 circuit board.

I'm not sure I understood all your explanation but I also thought about the coil. So for me this has nothing to do with the car but more the key. I need to lock the door manually everytime i leave the car. The other option is a failure of the engine or engine ECU.įirst of all thank you all for your answers !! i do have a 2nd key and the engine do start indeed so I can use my car normally however this second key has no remote lock/unlock features. Some of the scenarios are possible, but highly unlikely. There is actually a complicated procedure to communicate from the transponder chip to the engine ECU but it would be unheard of for just the immobilizer path to fail. I don't suppose you have a second key? Hmm that would be too easy! If the second key did the same thing, the problem would be in the car. It's possible there is a problem with the coil, the connector.or such. The HF module receives the information from the transponder via a coil around the ignition barrel.

So if the doors lock and unlock then then you can assume the HF module is working. The HF module is the next line in the security process and receives the information from BOTH the transmitter and the transponder. The transponders are very reliable and apart from perhaps crushing them, they are pretty well indestructible! I have never heard of one just stopping from working! The transponder arrangement has been used by many manufacturers for a long time and is very reliable. However, if the car wont start, might be to do with the transponder. You can only re-synchronize the transmitter not the transponder. If you can lock and unlock the car remotely, using the key, there is nothing wrong with the Transmitter. The transmitter has a circuit board and a battery and transmits a signal over a small distance to lock and unlock the doors. The transponder is a small 'unpowered' chip that communicates with the engine ECU to allow the engine to run. There are two independent parts to the key electronics. The car will open and lock remtotely but won't start the engine / the vehicle, so I changed the key battery but still, the car do not want to start.

Difference between ask fsk psk