Peugeot Citroen BSI Reset

Here is some useful information from RP Automotive Services. Mobile Car Mechanic Sittingbourne.

Peugeot Citroen cars have a “B S I” (Body Systems Interface) ECU.

This system holds information for immobiliser, mileage display, lighting and many other Peugeot Citroen programmed settings.

The software that controls the operation of these systems can become corrupted if the battery has been replaced and the “BSI” has not gone to sleep before disconnection of old battery or been woken up after reconnection of new battery or sometimes for no good reason at all!

Think of it as running your laptop on the battery and then removing the battery without shutting it down., not a good idea.

The system can be rebooted if a problem has occured so all is not lost.

Follow this procedure for the reset (reboot).

  • Have the drivers window fully open.
  • Open the bonnet and make sure all equipment is switched off including interior light.
  • Close all doors and remove key from the ignition.
  • Wait  3 minutes, disconnect the vehicle battery then wait 15 seconds.
  • Reconnect the vehicle battery and wait a further 10 seconds.
  • Switch on the side lights through the driver’s window.
  • Switch on the ignition DO NOT start the engine at this point.
  • Hold the lock button on the key down for 10 seconds while key is still in the ignition.
  • Switch off ignition and remove key open & close door to test central locking system.
  • Start the engine.

This is how to reset the BS.I It is worth doing if you have problems with lights,wipers,radio,central locking,starting etc as it only takes a few minutes and can save you  ££

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14 comments. Leave a Reply

  1. Frazer

    In this instruction what does “turn on the side lights” mean?

    • On the stalk where you turn the lights on. position 1 side lights, position 2 head lights.

      Hope this helps


  2. Boris de Jong

    Hello Richard,

    I have a Xsara Picasso from 2005, the battery is under the driver’s seat. If I understand correctly, I could perform this maneuver without popping the bonnet, since I can unhook the battery while sitting in the car… woud you say this is correct? Thanks, Boris.

    • Hello Boris,
      That method should be fine.

    • colin hunter

      and if the window cant go down how dose that work

      • Best option is to have a helper sitting in the drivers seat

  3. fred

    Hi I tried and it failed to work, thanks for the tip though

    My ’03 C5 hdi says “economy mode” immediately upon entering the car since I bought it 4 years ago.
    Radio and main courtesy lights do not work which is really annoying especially with a new baby at night I can’t see what I’m doing putting her in the seat.
    But the windows, 12v, glovebox light, reading lights and inside boot light all do even without the key in.

    • Hello Ted,
      Economy mode should extinguish when the car is started.
      Thank you for the comment

  4. James

    This sounds great, but I don’t have a remote key so cant follow that step, what problems will missing step 7 cause?

    • No problems it just proves the key is still in sync.

      Thank you for replying.

  5. Shaun

    Would this fix a fault on a speedo W reg 2000 206 diesel 1.9 style d. Ive changed the transducer and the speedo drive pinion. This and a replacement speedometer is a last resort. I could just try it and find out but killing the bsi scares me

    • It is worth a try, although without diagnosing the vehicle it is impossible to say.

      Thank you

  6. Thanks for the short but informative post on resetting BS.

    • Often overlooked when trying to solve electrical issues,
      Thank you for taking time to comment


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