CITROEN DS4 Owner's Handbook Manual page 187

Seat belt unfastened warning
lamp in the instrument panel
This warning lamp comes on in the
instrument panel when one or more rear
passengers unfasten their seat belt.
From approximately 12 mph (20 km/h),
this warning lamp flashes for two minutes
accompanied by an audible signal of increasing
volume. Once these two minutes have elapsed,
this warning lamp remains on until the one or
more rear passengers fasten their seat belt.
Seat belt unfastened warning
lamps display
3. Right hand rear seat belt warning lamp.
4. Centre rear seat belt warning lamp.
5. Left hand rear seat belt warning lamp.
When the ignition is switched on, with the
engine running or when the vehicle is moving at
less than 12 mph (20 km/h), the corresponding
warning lamps 3 , 4 and 5 come on in red for
approximately 30 seconds, if the seat belt is not
fastened.
When the vehicle is moving at more than 12 mph
(20 km/h), the corresponding warning lamps 3 ,
4 and 5 come on in red, accompanied by an
audible signal and a message in the screen, if a
rear passenger has unfastened their seat belt.
185
Safety