CITROËN 2014 C4 Picasso Handbook page 262

Practical information
Checking tyre pressures /
inflating accessories
You can also use the compressor, without
injecting any product, to:
- check or adjust the pressure of your tyres,
- inflate other accessories (balls,
bicycle tyres...).
F turn the selector A to the "air"
position.
F Uncoil the black pipe H fully.
F Connect the black pipe to the
valve of the wheel or accessory.
If necessary, fit one of the adaptors
supplied with the kit first.
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F Connect the compressor's electrical
connector to the vehicle's 12 V socket.
F Start the vehicle and let the engine run.
F Adjust the pressure using the compressor
(to inflate: switch B in position "I";
to deflate: switch B in position "O" and
press button C), according to the vehicle's
tyre pressure label or the accessory's
pressure label.
F Remove the kit then stow it.
Should the pressure of one or more
tyres be adjusted, it is necessary to
reinitialise the under-inflation detection
system.
Refer to the "Under-inflation detection"
section.