Chapter 1 : Transponder System Operating Principle; I - Foreword - CITROEN XSARA Technical Training Manual

TRANSPONDER SYSTEM OPERATING PRINCIPLE
I - FOREWORD
The role of this function is to protect the vehicle:
• by electronically locking the engine management ECU - on petrol and HDi
engines,
• by electronically locking the diesel pump electrovalve - on XUD engines.
The system consists of:
• an analogue unit located in the top of the ignition switch,
• a responder label located in the ignition key,
• a Built-in Systems Interface (BSI) which authorises unlocking or not,
• an engine management ECU or a diesel pump electrovalve (depending on
engine),
• a Multifunction Screen (MFS) for displaying messages (XSARA PICASSO only).
Note: For simplification purposes, only petrol and HDI engines are dealt with as
the general operation is the same for XUD engines.
MULTIPLEXED BSI - XSARA PICASSO AND XSARA – PART 9
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Chapter 1