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  ££

81 comments. Leave a Reply

  1. James

    Hi does this work on renault scenic’s with battery warning light even though the alternator has been changed with genuine part, everything works ok just warning light comes on now and again

    • Hi James.

      No this will not, as I have said many times, this is not a magic bullet. As far as your scenic is concerned I would suggest a wiring fault which a good auto electric person should find and rectify pretty easily.

  2. Ciprian

    I have a 307cc 1.6 2006. I replaced the battery and from then I have no power in the car. No lights on dash, no lock, no crank, nothing. When I put the battery a only hear a beep under the dash and that is it. Please help me with some diagnose steps. The OBD scanner cant’t read anythyng. Thx.

    • try the BSI Reset and see how it goes.
      Other than that you need a good auto electrician, sounds like you may have spiked the system.

  3. vlad

    I have a C2 2004,1400 cc,petrol engine ,there is the check engine light appearing on cluster each time I turn on the ignition. Any idea on how to make it dissapear?

    • the codes need to be read and faults rectified.

  4. Nigel

    How can i bsi reset without key fob. Lights abd wiper flicker on and off about 5 mins after i turn off and leave vehicle dont have a ckue what it is. Was told by pug breaker need new fuse box common fault. Any advice pls

    • Fuse box or (UPC) are an issue, however without proper diagnosis I am unable to advise.

  5. Steven Davis

    Hi I have a c2 it won’t rev over 3000 wil this sort that problem?

    • Hello Steven,
      This procedure is not a fix all, it is similar to rebooting your laptop or pc. If there is a sensor failure then this will not repair it, if the software has developed a glitch then this MAY resolve the issue.

      Kind Regards

      • sounds like there is a communication issue.

  6. Chris

    Hi I have a peugeot partner 2001 mk1 the dash has stopped working ie no speedo or fuil gage or temp gage ore speedo I have checked fuse all OK could it be the bsi many thanks

    • Possible, vehicle needs to be diagnosed properly to find the fault/s.

  7. Hedley

    Hello Admin
    I’ve had 58 plate C5 HDi tourer since new and the car has been a real pain when it come to ecomode and power. I changed the battery after 3 years because the battery kept running down after the dealer changed the engine fusebox and then the Citroen dealer told me it was no good anymore.
    The new Boasch battery wasn’t much better to the point that shuts down cars electrics or the steering fails while being driven. This happened in the French alps and driving on a motorway and then in a mountain gorge going up to Les Gits “not very nice” Anyway French garage told me the alternator was only pushing out 8 or 9 volts and that would be £ 450.00 thank you a new one and belt.
    Instead I boosted the battery with an emergancy booster which I had the sense to take with me and the car worked fine for the rest of my time in the Alps and Spain about two weeks in all. I got the jobs done at home which didn’t solve the issue of the alternator producing low voltage at low revs or tick over but okay when it’s reved up, and I’ve read that the ECU needs to be told if the battery has been changed which as far as I know it hasn’t been done. Could the problem be as simple as that? and would resetting the BSI do the job. Because I’ve just done the BSI reset and the TPMS now says pressure check instead of usual okay message!

    • The BSI reset is not a solve all procedure, I would advise employing a good diagnostic technician to scan your vehicle and trace the fault.

      Kind Regards


    • The BSI reset is not a magic bullet, the battery is not the problem here you will need a reliable garage who are able to read wiring diagrames and use the correct testing equipment i.e. scope, DMM and scan tool with live data.

  8. Lyssiemay Annoh

    I have 2003 citroen C5 engine would not start. Diagnostic says ECU need reconfiguration. Will this work?

    • Possibly, but there is no guarantee.

      Kind Regards


  9. John


    Do you have the 207 key pob reset notes or is this the same as a 307?

    • The procedure should be in your owners manual

  10. mar

    when should i turn the sidelights off please?
    thank you

    • After the process is completed

  11. tight
    I have a problem with signal lights gone full page
    what to do

    • Hi,
      You need to have the fault diagnosed and repaired by a proffesional.

  12. Diane

    Hi. Sons Pug 207 (2006). Driving the other day and was unable to turn lights and wipers off when he stopped. Had to remove wiper and headlight fuses and then the maxi fuse to get the car to ‘sleep’. Re-seated maxifuse and eventually got it to accept a reset and it started with no issues. Left running – replaced wiper and headlight fuses. All good…….5 minutes later wipers and headlights came back on again and car won’t re-start after being turned off. Do I need to do the reset with all fuses in situ or was this just coincidence? Can I do the reset if the side lights and wipers are still functioning (although they are switched off)?

    • I would suggest getting the vehicle hooked up to a diagnostics, the fault probably lies within the BSI so this needs to be interrogated.

  13. jamie

    Hi, not a Citroen, but a 55 Scenic II. After a dead battery, I have the parking brake warning, air bag warnings, and a wrong number on my odometer! I’m unable to do the fix described above (or remove the error codes) as when I press the ignition button (without pressing any pedals), the car starts! It shouldn’t do this! Any ideas as to why it may do so, and if I can still reset the BSI another way?
    many thanks

    • This needs to be scanned and possibly reprogrammed.

  14. Vladimir

    Hello , a few days ago i decided to change the locking system for my xsara picasso 2.0 year 2000, by instaling a new central locking with remote, anyway while instaling it, the electrician made some kind of shortcut and blow one of the fuses on the new system, and afterwards i noticed that when i start the sidelights, the indicator is not showing that are on,and also all the buttons lights are not luminating,the fuses are all OK,what may be the problem…somkind of reley…or the BSI unit?!?!..everything else is working normaly

    • Sounds like a short within the BSI,
      Get it scanned and the parameters configured.

  15. HI, I have a 2010 citroen c5 and at firs the wipers wouldn’t work when I turned them on, then after 10 mins they started working normally. The next morning when I turned them on only the drivers side wiper started moving. It went vertical and moved left and right only a few degrees each time. After tuning off the ignition it continued doing it for a few minutes. Gave it a few mins and tried again but they wouldn’t work at all for the whole day until later in the evening they started working normally again. The next day I took the scuttle dash off, disconnected the battery, pulled the plugs off the two motors, sprayed them with electrical spray, replaced them and they won’t work now. There are no other problems with any other electrics in the car. Would you have any idea’s as to what the problem could be. Thank you. Glen.

    • The vehicle needs to be hooked up to a diagnostic machine a the live input and output data needs to be assessed.

  16. Tam

    Will this solve 206cc for was running fine and suddenly just turning over but not starting

    • Hello Tam.
      It may be worth a try, but I think you should get a reputable mechanic and have a diagnostic scan on the vehicle.

  17. Brian

    My 51-plate Peugeot 206 GLX went into Economy Mode when I replaced the dead bulbs in the central display unit. The car wouldn’t start and the radio wouldn’t switch on. Tried your BSI reboot and it worked first time! Absolute magic. Thanks for the info. Brian

    • Hello Brian.
      Thank you for your feedback.

  18. Akram

    Hello Dude,,

    Thanks a lot for the post. It helped me on my Citroen Berlingo 600LX..

    All the besssssssssssssstttttt

  19. Debbie

    Xsara Picasso 2005, headlights stay on when lights have been turned off. Would resetting the Bsi fix this? Thanks

    • Hi Debbie.
      It may or may not, it is not a cure for all problems.

  20. HI
    I have a 2006 c2 vts that will not start on the key it just clicks under the glove box, the car will start if you connect a wire from the starter to the battery, will a BSI reboot sort this out or does it sound like a connection to a diagnostic machine.

    • Hello.
      I would be checking power and grounds, start with the main relay and see if that is sending power to the starter solenoid when the key is in the start position.

      is the main relay getting power?

      Check fuses controlling the circuit.

      Hope this helps

      • Thanks
        can you point me in the right direction for the location of the relay as I am struggling to locate it. did a test on the power lead to the starter with a light and got nothing, did a cable check back to the fuse box under the bonnet and got a circuit
        I have a new relay and would fit it if I could locate it.

        • Did you check the main feed to the starter or the smaller gauge wire to the solenoid? have you checked the starter circuit fuses?
          Before you start spending on parts the basics need to be covered.

  21. hi. I have a o4 diesel Picasso. its completely dead. the battery is fine. there is absolutely no lights on the dash. nothing powers up. central locking radio lights no a sausage. is there anything I can do. I went through all fuses . all are intact. please help

    • Hello Robert.
      I would suggest looking at the basics first. Do you have power to the fuse boxes? are the grounds good? get a wiring diagram and check the power and ground sides, then you can see where you have power and where it is missing. If this is out of your comfort zone then the best option is a good auto electrician. Sorry we can not be more helpful but issues like this require the vehicle to be available for diagnosis.

  22. David Milligan

    Did a BSI reset still not working told if you did 100mph speedo would reset and start working again is this true or not ?

    • I have not heard of this and would not recommend it. you need to get a diagnostic scan on the vehicle and not run the risk of loosing your licence or worse.

  23. David Milligan

    Hi 2002 Picaso speedo reading zero after battery reconection tried replacing vdu display and speed sensor would a BSI reset help this problem pulling hair out.

    • It is certainly worth a go, however I would suggest getting a diagnostic scan of the vehicle, rather than keep replacing parts.
      Hope this helps and thank you for looking at the site

  24. Rachel

    Hi, my 2006 Citroen C4 Coupe has gone into Economy made and will not start. Will this BSI reboot solve the problem, and will I need to get my key re-coded?

    • When the vehicle is started it will come out of economy mode

  25. Gemma

    on 7th attempt, different noises are being made and window wiper randomly came on. after howany times should i admit defeat?

    • Hello Gemma,
      I can not answer this as I am unaware of the original faults that the vehicle has.


      R Pearce

  26. My Peugeot 307, can’t start, windows don’t operate, the key has also lost memory and it shows “Economic Mode Active”. what must I do to solve this?

    • Hello ans thank you for posting.
      Your car will need to be connected to diagnostic machine to have the keys paired also the econ mode will disapear when the car is started.

      R P Services

  27. Ian

    Could this help with annoying 3 beep warning.? When car is up to temp(3 bars) everytime i stop at lights/junction ect revs drop down to around 500-1000 rpm and car trys to stall(but doesn`t). car runs fine from start up …c3sx 52 plate.

    • Hello Ian,
      Thank you for looking at the site,
      The BSI Reset will probably not help with your issue. The vehicle will need to be connected to a diagnostic machine.

      R Pearce

  28. kalin

    One more thing – remote needs synchronizing. If other bsi is to be fitted (battery replaced/disconnected) do you first have to do this because otherwise you cannot carry out the rebooting procedure?

    • If another bsi is to be fitted it will need coding to the vehicle.

  29. kalin

    Please clarify – do you turn ignition on after entering vehicle – door closed or open if it matters or you perform this through the window?

    • Hello Kalin.
      We usually lean in through the window and activate the ignition.
      Thank you for looking at the site.

      • sakhile

        HI. please help, i have a 2003 citroen c3 HDI and it wont start, my fuel indicator flashes. will the BSI reset help solve this problem.

        • No.
          Check fuel, get a diagnostic. This will be your best course of action

  30. mat

    I have a xsara picasso…I tried to install a new ICE and the car just shut down!!!! the car would turn over but not start. Lots of other systems simply didnt work either. The AA man said that it was coincidence that the radio installation and the electrical problems happened at the same time. anyway, he couldnt reset it. I took it to a citroen specialist who said that he ‘reset’ it and the car was back to normal!! hooray…

    thinking that the radio wasnt the cause, i tried to install it again but its now gone back to its original shutdown state!! aghgghhhhh.

    I have tried this reset about 30 times to the letter and it doesnt seem to do anything. In desperation, i have a couple of questions…

    1. are the 15, 10, 10 second timings exact or can they be a little longer…?
    2 .is it likely that the citroen chap used this procedure to ”reset’??
    3. could there be a problem with the bsi? if so, is it simple to replace it?
    4. should there be any feedabck at each of the steps to indicate good progress? i get blank everything until iginition ON
    5. by IGNITION, do you mean the first or second click of the key?

    any other advice would be gratefuly received.


    • Hello Mat,
      To answer your questions:
      1, Use the timings as set out this is stated by citroen/renault.
      2, The citroen chap would have used a diagnostic machine.
      3, poss problem with bsi, however without testing I cannot confirm this, it is an easy job to remove and replace but would require adapting to your vehicle which requires the correct machine.
      4, No feedback
      5, Ignition on is key in position 2, second click


  31. 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


  32. 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

  33. 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

    • lee

      I’ve got the exact same issue.

      Did you manage to resolve it?

      How can you get the car out of economy mode if it can’t even start.?

      • The car will come out of ECON MODE when it starts

  34. 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.

  35. 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

  36. 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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