CITROEN XSARA Technical Training Manual page 96

C - OPERATING MODE
1 - Operating phase
Nominal operation: see layout
The speed sensor (located on the gearbox) supplies the BSI with a
variable frequency signal.
The BSI calculates the instantaneous speed of the vehicle and encodes it
in a VAN frame.
The control panel takes this information from the VAN network and
displays it.
Specific operating cases
2 - Overspeed warning
The driver can access the choice of overspeed limit and does this using
the menu of the multifunction screen on the control panel.
When the vehicle reaches this speed, the multifunction screen on the
control panel displays the message: "PROG_SPEED XXX_KM/H". A two
tone sound is emitted.
Note:
MULTIPLEXED BSI - XSARA PICASSO AND XSARA – PART 4
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this function is deactivated by default.
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Chapter 3