Alarm Module: Testing and Inspection

Control Module Function

Communication with seat memory control module
The two control modules "seat memory" and "alarm system" communicate via a signal lead. This realises adjustment of the mirror and seat positions via the hand-held transmitter. If required positions of the rearview mirrors and driver's seat are assigned to a hand-held transmitter, the rearview mirrors and driver's seat move to these positions as soon as the vehicle is unlocked with the hand-held transmitter.

The PST2 can be used to test the communication line between the two control modules for an open circuit. Procedure:
1. Connect PST2 and switch on ignition.
2. Select "Seat memory" control module
3. Select "Alarm system interface level" in the menu item "Input signals"
4. Press the locked/unlocked button of the hand-held transmitter
The switch position on the PST2 is closed briefly.

Activation status memory
The alarm-triggering components that are in the non-active state during alarm system activation and that are therefore blocked for alarm triggering are stored in the activation status memory. The activation type also is saved. If the vehicle is secured, e.g. by remote control, and the oddments tray is open, this is indicated by the alarm system control memory by a brief horn signal. This status is stored in the activation status memory under "Oddments tray activation type: - by remote control-". This function can be used in troubleshooting, in as much as a faulty micro switch or faulty wire can be the cause for the horn signal. Reading out the activation status memory can help to track down the faulty alarm-triggering component, e.g. front lid, rear lid, oddments tray, etc.

Coding
Four functions can be selected under menu item "Coding:":
- Country coding
- Version coding
- Vehicle re-locking
- Alarm siren/tilt sensor

Country coding
The country in which the vehicle is used in as well as the vehicle design (sliding roof, convertible) can be coded using the Porsche System Tester 2.
The type of alarm output and its duration depend on the country codes.

Allocation of country coding

Allocation Of Country Coding (Part 1):

Allocation Of Country Coding (Part 2):

Allocation Of Country Coding (Part 3):

Allocation Of Country Coding (Part 4):

Allocation Of Country Coding (Part 5):

Allocation Of Country Coding (Part 6):

Allocation Of Country Coding (Part 7):

Coded "D" at the factory. The control module is coded "GB" or "B" only at the place of use.

Version coding
Four versions can be selected under menu item "Version coding".

Version 1
The doors are automatically locked as soon as the ignition is switched on.

Version 2
The doors are automatically locked if the vehicle exceeds a limit speed of 5 km/h.

Version 3
The doors are automatically locked as soon as the ignition is switched on. If the doors are opened while the engine is running, automatic re-locking takes place if the vehicle exceeds a limit speed of 5 km/h.

Version 4
The doors are not locked automatically.

NOTE: Automatically locked doors can be opened by pressing the central locking button (central locking switch) or by pulling on the door handle twice.

System test
All components of the alarm system (except for terminal 15) can be checked for operation under menu item "System test". During the system test a bar runs across the screen, and if, for example, the oddments tray is opened, an alarm is triggered. This alarm output differs from the usual alarm output in that the alarm horn is activated only for a short time. The alarm output is accompanied by interior lighting and direction indicator lights.

NOTE: The function of the passenger compartment monitoring sensor can be checked under menu item "Interior protection". When movement is detected in the passenger compartment, the alarm horn is activated briefly while the interior lighting and direction indicator lights go on continuously.

Interior monitor
The function of the interior monitoring sensor can be checked under menu item Interior monitor. When movement is detected in the passenger compartment, the alarm horn is activated briefly while the interior lighting and direction indicator lights go on continuously.

Learning function

Immobilizer
The immobilizer code can be entered under menu item "Learning functions/immobilizer" after the alarm control module is replaced.

CAUTION: The immobilizer code cannot be deleted or changed again. An incorrect input will render the control module useless: Input and check immobilizer code carefully.

Transponder key
A new remote control can be adapted for the vehicle under menu item "Learning functions/transponder key". The old transponders can be taught to the new control module after replacement of the alarm system control module and input of the immobilizer code. Refer to the chapters "Teaching hand-held transmitter" and "Reading out remote controls"

Remote control
Up to four remote controls can be adapted to the control module under menu item "Learning functions/remote control". The old remote controls can be taught to the new control module after replacement of the alarm system control module and input of the immobilizer code. Refer to the chapter "Teaching hand-held transmitter".

Reading out remote controls
Under the menu item "Reading out remote controls", the data of the remote controls can be read out after the alarm system control module is replaced. If it is not possible to read out and transfer the remote controls (e.g. no communication with the control module), the old remote controls can be adapted to the new control module (teaching hand-held transmitter).

Transferring remote controls
Under the menu item "Transfer remote controls", the data read out from the remote controls can be transferred to the new control module.

Teaching hand-held transmitter

General
Up to four hand-held transmitters can be adapted to the control module. The hand-held transmitter is used to operate the central locking system and to open the luggage compartment (front lid). Furthermore, the stored seat, mirrors and lumbar support positions are set when the vehicle is unlocked with the hand-held transmitter. Also refer to the chapter "Control module function - seat memory System S 02". Another function is the immobilizer which operates by means of the integrated transponder.

Work preparation
The following information is required to teach the hand-held transmitter:
- Key learning code from IPAS
- 24-digit Code No. (see barcode label on key grip)
- If the key is stolen or the hand-held transmitter is faulty, all keys still in the customer's possession will be required.

NOTE:
- During maintenance work, please bear in mind that the transmission frequency of the hand-held transmitter is different according to the country of use. The corresponding reception frequency is printed on the alarm system control module. This reception frequency is either:
- 433 MHz with M-number M534
- 315 MHz with M-Number M535; refer to the allocation table for country coding

Procedure
1. Connect the vehicle keys and the new hand-held transmitter and insert in the ignition.
2. Connect PST2 and switch on ignition.
3. Select "Alarm system" in the menu and press the double arrow key >>.
4. Select "Learning function" in the menu and press the double arrow key >>.
5. Select "Transponder key" in the menu and press the double arrow key >>.
6. "Input key learning code" appears on the screen. Input the key learning code with the arrow keys and and press the double arrow key >>.
7. "Please confirm input" appears on the screen. Check the input and press the F7 key to confirm the input.
8. Distinguish between loss and fault and additional hand-held transmitter for the transponder.
8a. Teaching an additional hand-held transmitter Select a free position (1, 2, 3 or 4) with the arrow key and press the F8 key. Now the transponder code is saved in the selected position. Note the position of the new transponder code.
8b. Teaching in the case of a lost or faulty hand-held transmitter:

CAUTION: Risk of theft due to the lost hand-held transmitter:

- It is essential to delete the transponder code of the lost hand-held transmitter as described in step 8 b).
- It is essential to delete the radio code of the lost hand-held transmitter as described in step 12 b).

NOTE: The adjustment function of the seat, mirror and lumbar positions via the hand-held transmitter is correct only if the radio code and the transponder code of a hand-held transmitter are each stored at the same position in the alarm system control module.

8b. Teaching in the case of a lost or faulty hand-held transmitter:
In this case, it is first necessary to identify and delete the stored transponder code of the lost or faulty hand-held transmitter. All remaining vehicle keys are required for this purpose, because all transponder codes are erased during the deletion function. The vehicle code of the vehicle key is displayed under "Current transponder". Press the F3 key. "All codes will be deleted" appears on the screen; confirm with the F7 key. Insert the vehicle key equipped with the new hand-held transmitter into the ignition lock and switch on the ignition. Establish communication between the PST2 and the control module. Select the position (1, 2, 3,or 4) with the arrow keys and and press the F8 key. The transponder code of the first hand-held transmitter has now been taught. Remove the key and repeat the process with the remaining hand-held transmitters.

9. Press the double arrow key << , select menu item "Remote control" and press the double arrow key >>.
10. "Input key learning code" appears on the screen. Input the key learning code with the arrow keys and and press the double arrow key >>.
11. "Please confirm input" appears on the screen. Check the input and press the F7 key to confirm the input.
12. Distinguish between loss and fault and additional hand-held transmitter for the radio code.
12a. Teaching an additional hand-held transmitter:
Select the same position (1 to 4) as for the transponder key and press the F8 key.
12b. Teaching in the case of a lost or faulty hand-held transmitter:
In this case, it is first necessary to identify and delete the stored "radio code" of the lost or faulty hand-held transmitter. The remaining hand-held transmitters are required for this purpose. Press the locking button on the hand-held transmitter and then insert the vehicle key into the ignition lock, switch on the ignition and re-establish communication with the control module. The radio of the hand-held transmitter with which the vehicle was last unlocked is displayed under "Current radio code". Compare this radio code with the radio codes at positions 1 to 4. This comparison allows the position of the lost hand-held transmitter (radio code) to be identified, as one radio code is ultimately left over at positions 1 to 4. Insert the vehicle key equipped with the new hand-held transmitter into the ignition lock and switch on the ignition. Establish communication with the control module. Select the identified position with the arrow keys and and delete the radio code with the F3 key. Then press the F8 key.

13. Carefully input the 24-digit code number with the arrow keys and press the double arrow key >>.
14. "Please confirm input" appears on the screen. Check the input and press the F7 key.
15. Now the handheld transmitter is taught. Go back to the menu item "Learning function", remove the key and switch on the ignition again. Once the key has been removed again, the hand-held transmitter is ready for use. Check handheld transmitter for operation.

Reading out and transferring remote control

General
When replacing the alarm system control module, it is possible to read out remote controls from the old control module and transfer them to the new control module. In this way, the hand-held transmitters (remote controls and transponders) can be retained. In other words, it is not necessary to change the hand-held transmitter when replacing the alarm system control module.

Requirements
- Communication can be set up between the PST2 and alarm system control module.
- The remote controls and transponders are correct and functional.

NOTE:
- When the remote control is read out and transferred, only the remote control data are read out and transferred.
- The transponder of the individual keys must be adapted to the control module. Four positions are available for this purpose in menu item "Transponder key". This function is described from step 19 onward.

Work preparation
The following information is required from the IPAS for reading out and transferring remote controls:
- Key learning code
- Immobilizer code

Procedure
1. Connect PST2 to the data link connector, and switch on the ignition.
2. Switch on the PST 2, select vehicle type 911 (996) and start the automatic control module search with the double arrow key >>.
3. After a brief search, the PST2 reports: "Fault memory reading completed".
4. Select alarm system control module and press the double arrow key >>
5. Select "Learning function" in the menu and press the double arrow key >>.
6. Select menu item Read out remote control and press the double arrow key >>.
7. "Input key learning code" appears on the screen. Input the key learning code with the arrow keys and and press the double arrow key >>.
8. "Please confirm input" appears on the screen. Check the input key learning code and press the F7 key.
9. "Remote controls were read out" appears on the screen. Press the double arrow key << twice in order to change to the control module overview. Switch the ignition off, remove the old control module, install the new control module and switch the ignition on again.
10. Press the double arrow key >> to set up communication with the new control module.
11. Select the menu item "Learning functions" with the arrow key and press the double arrow key >> .
12. The menu item "Immobilizer" is already selected. Press the double arrow key >>.

CAUTION: The immobilizer code can be input only once.
An incorrect input will render the control module useless:
- Input and check immobilizer code carefully.

13. "Input immobilizer code" appears on the screen. Input the immobilizer code with the arrow keys and and press the double arrow key >>.
14. "Please confirm input" appears on the screen. Check the input immobilizer code and press the F7 key.
15. Select the menu item "Transfer remote control" with the arrow key and press the double arrow key >>.
16. "Input key learning code" appears on the screen. Input the key learning code with the arrow keys and and press the double arrow key >>.
17. "Please confirm input" appears on the screen. Check the input key learning code and press the F7 key.
18. "Remote controls were transferred" appears on the screen.
19. Select the menu item "Transponder key" with the arrow key and press the double arrow key >>.
20. "Input key learning code" appears on the screen. Input the key learning code with the arrow keys and and press the double arrow key >>
21. "Please confirm input" appears on the screen. Check the input key learning code and press the F7 key.

NOTE: As the transponder coils must be taught individually, make sure that the allocation of the locations is the same as described under "Transponder code" on the IPAS printout (see step 22).

22. Four unoccupied positions are displayed on the screen. Position 1 is marked in black. Furthermore, the current transponder code is displayed under "Current key". This code must be stored in the same location as specified in the IPAS printout. Select position and press the F8 key. The position is occupied with the corresponding transponder code.
23. Withdraw the key and repeat steps 19 to 22 for the remaining keys.

All remote controls have now been transferred from the old control module to the new control module, and the transponders adapted to the new control module.
- Check all hand-held transmitters for operation (lock and unlock the vehicle).
- Check all transponders for operation (engine start).
- Read out fault memory and delete any stored faults.

Identification
The part numbers and the system designation (I 48) can be read out under menu item "Identification".