Transponder Coil

Transponder Coil

The transponder coil (C1318 on LHD, C0049 on RHD) is provided a battery value feed by the anti-theft alarm ECU (C1980 on LHD, C0057 on RHD) on an OP wire. The anti-theft alarm ECU (C1980 on LHD, C0057 on RHD) also provides the transponder coil (C1318 on LHD, C0049 on RHD) a pulsed feed on a OG wire. The transponder coil creates a magnetic field that excites a coil within the RF handset. This causes the RF handset to transmit a remobilisation code the anti-theft alarm ECU.

NOTE: The transponder coil is only energised when the ignition switch is turned to the 'ignition' position, and the engine is immobilised.

Anti-Theft Alarm ECU

Td5 When the anti-theft alarm ECU (C1979 on LHD, C0061 on RHD) receives an ignition feed via fuse 8 of the passenger compartment fuse box (C0508), it provides the Engine Control Module (ECM) (C0658) a coded digital signal on an LGS wire. If the coded signal matches the one expected by the ECM, the ECM will allow the engine to be started. For more information on engine starting, refer to the Starting and Charging – Td5 section of this manual.  STARTING AND CHARGING – Td5.

300 Tdi When the anti-theft alarm ECU (C1979 on LHD, C0061 on RHD) receives an ignition feed via fuse 8 of the passenger compartment fuse box (C0508) , it provides the immobilisation ECU (C0059) a coded digital signal on an LGS then B wire. If the coded signal matches the one expected by the immobilisation ECU, the immobilisation ECU will allow the engine to be started. For more information on engine starting, refer to the Starting and Charging – 300 Tdi section of this manual.  STARTING AND CHARGING – 300 Tdi.