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Chapter 1
III - OPERATION
A - SYSTEM COMPONENTS
Transponder:
An analogue unit, located in the top of the ignition switch, sends a signal to the
ignition key. This is fitted with a responder label which disrupts the signal
emitted by the analogue unit. The modification to the signal allows the
analogue unit to transmit the key code (responder label) to the BSI.
Built-in Systems Interface:
The BSI decodes the signal sent by the label. It considers the key to be valid
or not, depending on the signal received from the key.
It then controls the display on the MultiFunction Screen (XSARA PICASSO) or
on the control panel (XSARA) and the locking/unlocking of the engine
management ECU.
Engine management ECU:
This can be locked or unlocked by the BSI. When locked, its functions are
prohibited (ignition, injection, etc). On diesel engine vehicles, the diesel pump
electrovalve is locked in the same way.
MultiFunction Screen (XSARA PICASSO only):
This displays the message "ENGINE IMMOBILISER FAULT" if it was not
possible to unlock the engine.
Case of engine locked: There is a communications problem or the engine
ECU has not unlocked itself after receiving the request from the BSI.
Case of unknown transponder: The key has not been recognised or has not
been reprogrammed after the last programming.
Control panel (XSARA only):
There is an LED on the control panel which shows the status of the
transponder.
MULTIPLEXED BSI - XSARA PICASSO AND XSARA – PART 9
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