Operation

Drive block system:
When the ignition is switched on (actuation of term. 86 s at the ignition lock), the transponder inside the key head is read out.

The transponder is an electronic component encapsulated in a glass element and comprises a microchip and a small induction coil. During production, the microchip is assigned a unique, undeletable code number.

Using and inductive transmission method, the supply of power to the transponder and the exchange of codes is performed via the air gap between the chip coil and the induction coil attached to the ignition lock.

The induction coil is linked to the signal converter unit attached to the steering-column lock housing.

When the transponder code is read out (the read-out procedure is started by the drive block control module), the information is compiled by the signal converter, where it is then converted into a digital signal and transmitted to the drive block control module.
A valid transponder code deactivates the drive block.
Up to four different transponders (keys) can be programmed into the drive block control module.

This is performed using the Porsche System Tester 2.

Intervention in engine management:
The electronic release of the DME is performed by means of an encoded data exchange with the drive block control module.

When the ignition is switched on (term. 15) the DME starts communication with the drive block control module. Polling by the DME is met with a different response depending on the release status of the drive block.

If the drive block is activated, i.e. no valid transponder code could be detected, the appropriate data protocol is sent back in order to inform the DME of this. The DME remains disabled (starter, injection, and ignition functions).

If the drive block is deactivated, the electronic release is given and the engine can be started.

Central locking:
The central locking system is actuated via the door lock and via the radio emitter or driver's side door lock in tile case of vehicles with an alarm system.

The central locking system has three possible states:
- Unlocked state
- Locked state Doors can be opened from inside
- Door-safe state Doors cannot be opened from inside

The unlocked central locking system is placed in the "door-safe status" by actuating the door lock once only or using the transmitter.
In this state, the alarm system and passenger-compartment monitoring are active.
The central locking system is placed in the "locked state" by actuating the lock or transmitter twice within 1mone second. As a result, only the alarm system is active, i.e. only the outside of the vehicle is monitored. The passenger-compartment monitoring system and any other additional systems are not activated.

If the driver's door is not closed properly, the vehicle cannot be locked and term.

Emergency actuation:
If, resulting from a mechanical fault, the central locking system cannot be placed in the door-safe" or "door-locked states, the central locking opens again. In this case, those elements of the central locking system which are still functional can be locked by actuating the lock or transmitter three times (max. one second between each actuation cycle). The alarm system is then active.

Central locking button:
Both doors can be electrically locked and unlocked using the central locking button on the control panel. If the central locking elements of both doors are in different positions, synchronization occurs before the central locking is triggered again, i.e. the elements are set to a predefined position beforehand.

The indicator in the locking button lights up when the doors are locked.
A visual indication is also given in the following situations:
- after "door safe" locking. 2 Hz flashing display for 10 seconds
- after "locked" function, indicator lights up for 10 seconds

If the doors have been locked with the central locking button, they can be opened using the inside door handle:
- Pull the inside doors handle once Door lockunlocks
- Pull inside door handle again Door opens
If an accident occurs and the central locking system is locked, it is unlocked by means of the airbag system. This only happens if the ignition key is actuated (term. 86 s and term. 15).

Automatic relocking:
If the vehicle is unlocked using the transmitter and none of the vehicle doors are opened within a minute, they are relocked automatically.
In this case, the alarm system is not activated.