Vauxhall Workshop Service and Repair Manuals

Checking

 

Features Specific to this System

 

The immobiliser with transponder, in conjunction with the engine electronics, is an independent system that can be checked using TECH 1; it operates independently of the central door locking system.

 

 

The immobiliser prevents unauthorised starting of the vehicle. The handle of the vehicle key (transponder key) contains an integrated electronic component (transponder). The transponder does not require maintenance. Voltage is supplied cordlessly by the immobiliser control unit. Each transponder is programmed with a permanent transponder code, which is read out by the immobiliser control unit. Each vehicle key has a different transponder code, guaranteeing a high degree of security.

 

 

When the ignition is switched on, the transponder key sends the transponder code via an antenna integrated into the immobiliser control unit. The immobiliser control unit compares the received code with the stored transponder code.

If the correct transponder code is recognised, the immobiliser control unit sends a coded signal (imo signal) to the engine control unit (for vehicles with petrol engines or the 25 DT diesel engine). The engine control unit compares the received imo signal with the programmed imo signal.

 

 

For diesel vehicles (except the 25 DT) the imo signal is sent to the fuel cutoff solenoid valve, where the imo signal is likewise checked.

 

 

During the transfer and evaluation phase of the transponder code and imo signal, the engine can be started. If the imo signal does not match, the engine is then switched off again. This avoids unnecessary delays or waiting when starting the vehicle.

 

 

If there is a malfunction (incorrect transponder, no communication), the engine telltale in the instrument panel flashes (only vehicles with petrol engines or the 25 DT diesel engine). The corresponding trouble code is stored.

If there is a malfunction, the ignition must be switched off and on again before starting can be attempted again.

 

 

Note:

The immobiliser with transponder is being gradually introduced to vehicles. Vehicles with petrol engines will be converted first, and the changeover for diesel vehicles will commence in Model Year 95½.

 

 

To protect against unauthorised tampering, the immobiliser control unit can only be programmed (F7) once the security code has been entered.

 

 

The following codes/data are programmed into the reference memory of the immobiliser control unit in production:

 

 

·   Security code

·   Engine type

·   Mechanical key number

·   Vehicle identification number

·   Transponder code

 

 

The security code cannot be erased or overwritten with TECH 1.

The transponder code, security code and engine type are processed internally and are not shown on the TECH 1 display.

The vehicle identification number and mechanical key number are stored as further important vehicle identification data and can be displayed on TECH 1. For a description of the input process for the security code, the mechanical key number and the vehicle identification number, consult section 4.7.3.

 

 

Security Code

 

The security code prevents unauthorised programming and access to data in the immobiliser control unit via TECH 1.

The security code consists of a 4-digit code number and is programmed into the immobiliser control unit.

 

 

Service:

 

New immobiliser control units are not programmed with a security code. When replacing the control unit, the security code specified in the car pass and all other codes and data specified above must be programmed into the control unit using TECH 1.

 

 

Programming of the security code with TECH 1 can only be performed once and must therefore be carried out with utmost care: it cannot be erased or overwritten.

 

 

Important Information:

When returning the immobiliser control unit, always specify the security code allocated to the control unit, as otherwise further processing is not possible.

 

 

Car-Pass     A car pass is allocated to each vehicle ex works and is issued to the purchaser on delivery of the vehicle along with the other vehicle papers. A card similar to the conventional radio pass is used. For operations on the immobiliser or engine control unit, the car pass must be presented by the customer.

 

 

Regardless of language, the TECH 1 display indicates the terms used in the car pass, with the following meanings:

 

1     VIN                             Vehicle Identification Number

2     Security Code              Security code for diagnosis and programming with TECH 1

3     Engine Type/No.          Engine type/number

4     Key No.                      Mechanical key number

5     Radio Code                 Security code for radio

6     CD-Changer Code      Security code for CD changer

 

 

The vehicle identification number (VIN), the security code and the engine type/number are always printed.

The data for the key number, radio code and the CD changer code will not always be printed during the introductory phase. This information should be entered by the dealer by hand during the vehicle's pre-delivery inspection. The engine number can be ignored for the time being.

During the introductory phase, a separate radio pass will be issued for the radio, as before. Once the car pass is fully established, the radio pass will be discontinued.

 

 

Loss of a Car Pass

 

If the car pass is lost, the data entered on the pass can be requested from Adam Opel AG/
Vauxhall Motors Ltd.. The procedure and the forms required for this will be published separately in a Technical Information Bulletin.