Gave my mate a hand to change the HG on his 1995 C180, all done now, but the car won't start. Starter motor turns but it won't start. lights in the mirror (red and green) flash alternately indicating an immobiliser issue. The vehicle is NOT fitted with a dealer alarm option (usual issue with these).
Reading errors with Carsoft gives an immobiliser issue, I verified this by measuring the voltage on pin 12 on the ECU and this should be 4-7 volts when the car is open, but it stays on 2,2 volts both open and closed. This means the ECU is not released as i understood.
How can this be fixed, if needed by taking out the immobiliser completely, car is not worth stealing anyway. Is there anything else in the car involved in the immobiliser proces?
I swapped in a different ECU+immobiliser from a working car but other than that the central locking now works with the key out of the other car, it still won't start. The ignition lock does not have a transponder ring.
Measured the OVP relay, and replaced it to be sure but it did not help
Any ideas? maybe a wiring diagram of this system?
attached pics of carsoft errors and the immobiliser
Reading errors with Carsoft gives an immobiliser issue, I verified this by measuring the voltage on pin 12 on the ECU and this should be 4-7 volts when the car is open, but it stays on 2,2 volts both open and closed. This means the ECU is not released as i understood.
How can this be fixed, if needed by taking out the immobiliser completely, car is not worth stealing anyway. Is there anything else in the car involved in the immobiliser proces?
I swapped in a different ECU+immobiliser from a working car but other than that the central locking now works with the key out of the other car, it still won't start. The ignition lock does not have a transponder ring.
Measured the OVP relay, and replaced it to be sure but it did not help
Any ideas? maybe a wiring diagram of this system?
attached pics of carsoft errors and the immobiliser