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Advice on programming, control module replacement, etc. for anti-theft alarm with VSS (ATA 2)

SERVICE INFORMATION
Bulletin Nbr: 383-1764
Date: ........... JUNE 1997
Market: NOT US/CA
Advice on programming, control module replacement, etc. for anti-theft alarm with VSS (ATA 2)


Cars concerned

Saab 900 M96- with anti-theft alarm VSS (ATA 2).

Background

This SI deals with those questions and unclear points which may arise in connection with the replacement and programming of remote control units and control modules for the VSS anti-theft alarm and also the Trionic/Motronic control module.

Page numbers quoted in the text refer to Service Manual 3:5 “Anti-theft alarm with VSS”.

Procedure

Checking that the VSS is fitted

When the ISAT/Tech 2 is connected for diagnosis of the anti-theft alarm, the display shows which type of alarm is installed on the car.

Diagnosis

Make a habit of always turning the ignition switch ON when carrying out fault diagnosis on the system with the ISAT/Tech 2. This is to avoid inadvertent deprogramming of remote control units when arming the alarm.



Important

Unless otherwise stated in this SI, the ignition switch should be ON when programming is performed.


If an alarm that has been installed and programmed in a car is immobilized, it will not be possible to establish communication with the ISAT/Tech 2. The alarm must then first be disarmed by pressing the left-hand button on the remote control unit.

The procedure to be adopted is divided into three sections:

A Control module for VSS alarm

B Remote control units

C Control module for Trionic/Motronic

A. Control module for VSS alarm



Before a control module is removed for repair under warranty it must first be de-immobilized and the remote control units deprogrammed with the command “DEPROGRAM ALL” as described on page 190 of the Service Manual.

If this cannot be done for some reason, the remote control units should be returned together with the control module for repair under warranty.

If this is not done the claim will not be valid.



Important

When the alarm control module is changed, the engine control module need not also be changed.


When a new unprogrammed control module (spare part) is fitted in a car, the LED will initiate a series of double flashes when the ignition switch is turned ON. This indicates that the immobilization function is active and that no remote control units have been programmed. The engine cannot be started.

The control module must then be programmed as described below:

Important

The ignition switch must be OFF during this programming operation.



1. Carry out basic programming as described in the Service Manual, page 186. Note that when the remote control units are to be programmed, the “DEPROGRAM ALL” command (see page 190) must be given before programming “REMOTE CONTROL”.

2. Carry out programming (see page 51) in the type of engine management system that is fitted to the car. See the “IMMOBILIZATION” menu.

3. On completion of programming, the left-hand button on each remote control unit must be pressed up to 5 times in succession before it will start to work.

If communication with the alarm control module cannot be established for some reason, unplug the connector from the control module and plug it in again. Then start all over again from point 1.




If an alarm control module is transferred from one car to another, "type of engine management system" must be reprogrammed as described in the Service Manual, page 51. This must be done even if both cars have the same type of engine management system.

B. Remote control units



Connect the ISAT/Tech 2 to a car with an alarm that is known to be in working order. The remote control unit need not be programmed for the car it is to be tested on.

Select the “READ VALUES” - “REMOTE CONTROL” menu. When the appropriate button on the remote control unit is pressed, this will be indicated on the diagnostic tool's display.




•

New remote control units can be programmed. When the remote control units are to be programmed, the “DEPROGRAM ALL” command (see page 190) must be given before programming “REMOTE CONTROL” (see page 186).

•

The control module must be changed. There is no way the ISAT/Tech 2 can be used to cancel immobilization nor can it be cancelled by any other means.


C. Control module for Trionic/Motronic



When an engine control module is changed, the new control module must be “married” to the car's alarm control module. The engine cannot otherwise be started.

This can be done with the ISAT/Tech 2 (menu “IMMOBILIZATION”) by establishing communication with the alarm control module and programming it with the type of engine management system the car is fitted with, see page 51 in the Service Manual.



These diagnostic trouble codes are not described in the relevant engine management system manual but will be found on pages 140 and 142 in Service Manual 3:5 “Anti-theft alarm with VSS”.

Diagnostic trouble code will be stored in the engine control module if the alarm code from the alarm control module is missing.

Diagnostic trouble code will be stored in the engine control module if the alarm code from the alarm control module is incorrect.

An alarm code is understood to be the code sent by the alarm control module to the engine control module when the engine is started. If the code is missing or incorrect, the engine will not start .

Diagnostic trouble codes may sometimes be generated when the alarm is immobilized and an attempt is made to start the car. If the alarm and immobilization system function as intended, the diagnostic trouble codes can be ignored and cleared.

Standard time information

Diagnostic trouble code: -

Object code: 38351

Localization code: 09

Action code: 05

Time: -