Introduction

Alarm System I 48

Introduction

General Instructions/Safety Instructions

The following points must be observed during vehicle diagnosis:
- After the battery is connected, volatile memories must be reprogrammed. In the case of radio coding and tuning, the customer must be informed of decoding and the deleted tuner memory.
- After troubleshooting or repairs, erase the fault memory with the Porsche System Tester 2 and carry out a test drive.
- After the test drive, read out the fault memory with Porsche System Tester 2 again.

CAUTION:
Danger of damage due to improper handling of the battery and the control module connectors.
- Never disconnect battery with engine running.
- Never start engine without securely connected battery.
- Never pull off or push on plug connections of the control modules or other electronic components when the ignition is switched on.

Special tools 9616 and 9617

The two special tools 9616 and 9617 can be used for the measurements carried out on the 42-pole connector (connector A) Express reference has not been made about connecting the special tools in the troubleshooting section.


General Information on the Fault Memory

Fault code setting conditions

Fault codes can be set in several circumstances, e.g.
- battery disconnected
- plug connections disconnected
- power failure
- etc.

In these circumstances, no fault is present in the system and the fault memory must be erased.

Fault memory Info key [F8]

In order to be able to assess the fault exactly, the fault memory info key [F8] must be pressed. This information should be saved using the Save key [F4] and printed out. If a fault code is stored with "not present" status and no other problems are present, then the fault memory must be erased.

Open circuit - short to ground/short to B+/version; vehicle parameters/counter

Open circuit or short to ground: There is (present) or was (not present) a short circuit to ground or an open circuit in the circuit to the control module terminal.
Short to B+: There is (present) or was (not present) a short circuit to voltage.