Engine Control Module (GEMS Late 1995-98)

When the vehicle is in an unarmed condition, the BECM will transmit and engine remobilization code 48 ms after the ignition is turned on until the BECM receives an acknowledgment that the ECM has received the correct code.

The ECM confirms receipt of the correct code by signalling the BECM to illuminate the check engine warning lamp and allow engine cranking when requested. The ECM also enables the engine fuelling system on receipt of the correct code from the BECM.

The code sent from the BECM is unique to the vehicle and the same code is transmitted each time the ignition is turned on. If the BECM is replaced the new BECM will automatically generate the same code. If the GEMS ECM is replaced, TestBook must be used to input the code to the new ECM.