I think you may be talking about the dashboard dimmer switches.
It's in the fusebox on the left hand side below the steering wheel
Under the passenger's seat for a right-hand drive car, or under the driver's seat for a left-hand drive car.
Were is the fuel shut of valve on a Citroen Piasso. Open the bonet and look on the left hand side on the top corner, there is a red push button switch. that is the fuel cutoff switch.
Depress computer button on end of right hand (Wiper) stalk several times until required data is displayed.
Take out spanner from the right hand rear floor compartment. Unscrew the bolt attaching the wheel from the inside of the boot.
Air filter is on the right hand side of engine bay.Undo 4 screws on black cover at end of air inlet duct .
there is a fuse panel on the right hand side of the dashboard next to the drivers door.the fuse for the heating is a 40amp black fuse ,situated near top of second row of fuses
pablo picasso wrote with left hand. his mother was worried about him as they thought it was unlucky to write with left hand.
If Your sitting in the drivers seat, theres a little cubby hole with a cover down to your right hand side. Your colour code is located on a sticker on the back of this cover.
Service Light Reset - Citroen Xsara (1997 on) Using button located at the right hand side of the speedometer dial. Switch the ignition off. Press and hold button. Switch on the ignition. Keep the button depressed Service Interval and "spanner" symbol will illuminate for five seconds.
Remove the fuse board cover at the right hand side of the steering wheel, the switch is located behind the mass of cables, a quarter turn to the left will allow the switch to be removed.
press and hold the book symbol on the right hand side of the dash display at the top then scrowl through using the same button to change time use the bottom button when you reach the time section.