Circuit/System Description
For an overview of the component/system, refer to Immobilizer Description and Operation
| Circuit | Description |
|---|---|
| Ground circuit | Supplied by a control module. |
| 12 V Reference | Supplied by a control module. |
| Serial Data circuit | The device is controlled over a serial data bus by the body control module. |
| Component | Description |
|---|---|
| K9 Body Control Module | Depending on the version, the control module can support different functions:
The control module also reads various switches and sensors and makes their values available via serial data. |
| K89 Immobilizer Control Module | The control module is attached to the immobilizer coil, which surrounds the ignition key or switch. The coil produces a magnetic field that powers the transponder in the ignition key and, at the same time, transmits a code to the transponder, which answers with another code. The correct code is one of several pieces of information that is processed before the engine is allowed to be started. |