The alarm control unit is diagnosable. It can be read out only with System Tester 9288.
The menu includes the following functional groups:
- Input signals
- Country codes
- System check Note
For some of the faults, two types of causes must be distinguished:
- The fault displayed is an actual fault that has to be remedied.
The fault displayed is a fault condition that has been caused deliberately, e.g. by leaving the open glove compartment open.
Troubleshooting requires that the person performing the tests
- is familiar with the location of components, function and technical relationship of the systems being tested (refer to Model Information)
- is able to read and evaluate Porsche wiring diagrams
- knows the functions of circuits and relays
- is capable of using testers and of evaluating the test results.
Tools required for troubleshooting: Special Tool 9540
The Special Tool is required because connector II is fitted with miniature terminals. To avoid damaging the terminals, always use the Special Tool for the tests. When checking for continuity, attach connector to wiring harness only. When checking signals and voltages, attach connector to wiring harness and control unit.
Pin assignments of alarm control unit connector
4 - Anti-drive off feature
7 - Interior light
8 - Turn signal left
9 - Turn signal right
11 - Motor „Closed" Actuator door lock
12 - Motor „Open" Actuator door lock
14 - LED front passenger's door
15 - LED driver's door
1 - Activate / closed
2 - Deactivate / open
3 - Rear lid contact
4 - Tailgate lock
5 - Hood contact
6 - Speedo signal Term. A
10 - Central locking system position switch
11 - Central locking system button
12 - Central locking system position switch
16 - Glove compartment contact 17-Input 3
20 - Central locking system button light
21 - Door contacts
24 - External electronics
Overview of possible displays
Control unit defective
Glove comp, open during activation
Voltage failure Term. 30 with active alarm system
Input 2 to ground during activation
Voltage failure during alarm output
Central lock button closed during activation
Position of the drives unplausible
Input 1 to ground during activation
Door(s) open during activation
Input 3 to positive during activation
Engine compartment open during activation
Position switch on drive closed during activation
Luggage comp. open during activation
Position switch on drive open during activation
(closed loop) interrupted during activation
Radio contact to ground during activation
Tailgate lock switch closed during activation
Fault, Fault Code Possible Causes, Elimination, Remarks
After a fault in the alarm system has occurred and after it has been remedied, the fault memory must be erased.
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