Antitheft and Alarm Systems: Description and Operation

Component Arrangement

Component Arrangement (Part 1):

Component Arrangement (Part 2):

Function of individual components

1. Control module
Processes the incoming signals and, if necessary, triggers an alarm.

1a. Control module fuse
A 15 A fuse is located in the control module between both slots which protects the control module from short circuit at the output. If this fuse blows, the control module functions are no longer available.

2. Transponder coil and signal converter
The transponder coil reads the transponder code out of the transponder.

The signal converter obtains the transponder code from the signals sent by the transponder, and then sends this code on to the alarm system control module. With the help of the Porsche System Tester II 9588, the transponder of the key inserted in the ignition can be adapted to one of the four memory locations for transponders. The first time the transponder is adapted, its Secret Key is programmed. The Secret Key of the transponder can no longer be overwritten, i.e. a programmed and adapted transponder is permanently assigned to one vehicle.

3. Central locking button
The doors can be locked and unlocked using the central locking button.

4. Front lid micro switch
The alarm contact on the front lid connects ground to the control module when the lid is opened.

5. PCM alarm contact
The alarm contact on the PCM mounting frame connects ground to the control module when the PCM is removed from the frame.

5a. CDR23 alarm contact
The alarm contact on the radio mounting frame connects ground to the control module when the radio is removed from the frame.

6. Alarm horn (country version)
In the event of an alarm, the horn is supplied with positive potential by the control module.

NOTE: If the positive supply for the alarm horn is interrupted, a visual alarm is triggered via the direction indicator lights and the interior lights.

7. Alarm readiness light
Function 1.
Display of the locking state.

Function 2.
Display of the operating state of the alarm system.

Six display types are possible.
- Off
- On
- Normal flashing (0.5 Hz)
- Double flashing (0.5 Hz)
- Rapid flashing (2.0 Hz)
- Rapid flashing (10.0 Hz)

8. Glove compartment micro switch (as of MY 2003)
The current status of the glove compartment is recorded by a micro switch and reported to the alarm system control module by connecting ground (Open).

9. Tilt sensor (installation position up to MY 2002)
The tilt sensor determines the tilt of the vehicle. If the change in the tilt exceeds a programmed limit value, an alarm is triggered.

NOTE:
- If the positive supply for the tilt sensor is interrupted, a visual and audible alarm is triggered via the direction indicator lights and interior lights and the alarm horn (alarm siren).
- A valid transponder must be inserted into the ignition lock to stop the alarm.

10. Passenger compartment monitoring sensor and convertible top closed switch

The passenger compartment monitoring sensor connects ground to the control module when movement is detected in the vehicle. The convertible top switch is installed behind the passenger compartment monitoring sensor. The switch connects ground to the control module. The function of the switch can be checked under Convertible top/sliding roof in the Input signals menu item.

11. Rear lid micro switch
The current status of the rear lid is recorded by a micro switch and reported to the alarm system control module by connecting ground (Open).

12. Micro switch for left and right door lock modules

The door locks (driver's/passenger's door) each contain five micro switches.
- One switch for priming the system (ground pulse).
- One switch for deactivating the system (ground pulse).
- One switch for recognizing door closed.
- One switch for recognizing door locked.
- One switch for recognizing door secured.

13. Open button for front and rear lids
There are two buttons for opening the front and rear lids.

14. Micro switch for oddments tray
The current status of the oddments tray is recorded by a micro switch and reported to the alarm system control module by connecting ground (Open).

15. Antenna for alarm system control module
In vehicles without a radio or PCM2, communication between the hand-held transmitter and the alarm system control module takes place via a lead which is fastened to the wiring harness in the A-pillar.

In vehicles with a radio or PCM2, communication with the alarm system control module takes place using an antenna amplifier or antenna diversity via the antenna lead which is laid in the A-pillar.