Transponder Coil

Transponder Coil

The transponder coil (C0049) is connected to the immobilisation ECU (C0059) by YU and YN wires. Both connections between the immobilisation ECU and the transponder coil switch between being both inputs and outputs. The transponder coil reads the vehicle identification information contained within the key transponder and relays it to the immobilisation ECU.

Immobilisation ECU

The immobilisation ECU (C0059) is located beneath the centre console, adjacent to the handbrake. It receives a constant battery feed from fuse 18 of the passenger compartment fuse box (C0584) on an RY wire, and an auxiliary ignition feed from fuse 39 of the passenger compartment fuse box (C0587) on a PB wire.

If the immobilisation ECU (C0059) has received a valid signal from both the transponder coil (C0049) and the steering column interlock ECU (C2055) when the ignition switch is turned to the crank position, it transmits a rolling code to the Engine Control Module (ECM) (C0331) on a BP wire.

The immobilisation ECU (C0059) also provides a feed to the interlock relay (C1455) on a B wire. The energised interlock relay (C1455) provides a feed to the starter motor relay (C0179) on a B then BY wire.

For more information on operation of the starter motor, refer to the Starting and Charging – V8 section of this manual.  STARTING AND CHARGING – V8.