Specifications

GENERAL OPERATION

INTRODUCTION

The Citroen Immobiliser systems are made up of 3 different types.

They all perform various functions, and it is important to understand

the basic configuration and the types of systems fitted.

IMM– STANDARD IMMOBILISER

This system was the first transponder system fitted to the Citroen

range of vehicles, after the keypad system was phased out. The sys-

tem is a basic electronic control unit which consists of immobiliser

unit and transponder aerial to pick up the transponder signal code.

This system is similar to the GM immobiliser system, and is pro-

grammed and diagnosed in much the same way.

CPH—PASSENGER COMPARTMENT PROTECTION CONTROL

UNIT

The next generation of Immobiliser and alarm system produced was

the CPH system which controls a number of additional components

which further enhances the vehicle protection system. These include

central door locking, ultrasonic sensors to name a few.

This system is programmed in much the same way, but offers addi-

tional functionality on live data and actuator functions.

Programming keys on CPH system does not erase the Plip.

BSI—BODY SYSTEMS INTERFACE

This is the latest system, the alarm and immobiliser have now been

incorporated into the body control unit, which controls all body units,

including wipers, indicators, lights, doors, windows, locks, boot, ser-

vice interval, horn, etc.

Again the BSI because the immobiliser is part of a complicated sys-

tem there are many more functions included on actuators, special

functions and live data.