2015 C4 Picasso alarm/BSI problem

[malawiboy1]

Hi and welcome.

The alarm can go off if you leave the windows open of course as the volumetric sensors can be triggered by air movement. If this is happening while the car is locked and happening a lot of the time, then it will very likely need a new alarm module. These have a battery backup, but like all rechargeable batteries, they have a finite life, so when they don't hold a charge they start tripping when the voltage drops enough - similar to when somebody cuts the supply.

I've replaced a few of these now and a new module has fixed the problem. A diagnostic may not help in this case as it is a temporary fault , but it will just keep logging the triggering.

So if the alarm keeps triggering even after deactivating the internal sensor protection with the button after switching the ignition off, then I would suggest the module needs replacing.

would you have the module part number that need replacing?
and best place to buy from pleases
thanks in advance

[GiveMeABreak]

Check you owner manual for specific instructions - you can only disable the volumetric (internal movement detection) sensors using the alarm button. Usually this is when you have somebody in the car and lock it, to prevent the intrusion alert going off when they move about. Normally, when you switch off the ignition, press and hold the alarm button and the LED should glow solid.

Then exit and lock the vehicle as normal. This will prevent the internal sensors from functioning - but will re-enable the next time the car is locked.

[GiveMeABreak]

would you have the module part number that need replacing?
and best place to buy from pleases
thanks in advance

If you can't already find the info you need on the Forum, we do ask for a membership upgrade for official parts data as we are in turn charged for this. It will cover you for future parts requests for up to 2 years, so excellent value.

If interested, links are below, then pop your VIN up.

A response to your question by a Forum Admin requiring parts or additional information requires you to have made a current contribution (£10 min.) to the Forum.

To Upgrade Your Membership & Donate Click Here For Further Information About Vehicle Parts and VIN Numbers Click Here

If you don't think this would be of benefit, then the best option is to ask your dealer, but they're not always happy providing part numbers alone.

[Paul-R]

On all the cars I've seen, if you lock your car using the key in one of the door lock barrels then this will simply lock the car without activating the volumetric sensor.

No idea what to do if you're unlucky enough to have keyless start on your car!

[GiveMeABreak]

Yes it is similar with keyless entry Paul.

Just remove the emergency key from the fob, turn once to the rear in the driver's door to lock and again within 5 seconds to deadlock. Doing this will not activate the alarm.

[malawiboy1]

would you have the module part number that need replacing?
and best place to buy from pleases
thanks in advance

If you can't already find the info you need on the Forum, we do ask for a membership upgrade for official parts data as we are in turn charged for this. It will cover you for future parts requests for up to 2 years, so excellent value.

If interested, links are below, then pop your VIN up.

A response to your question by a Forum Admin requiring parts or additional information requires you to have made a current contribution (£10 min.) to the Forum.

To Upgrade Your Membership & Donate Click Here For Further Information About Vehicle Parts and VIN Numbers Click Here

If you don't think this would be of benefit, then the best option is to ask your dealer, but they're not always happy providing part numbers alone.

done paid my T ID: 21029406512953937

[malawiboy1]

my vin VF7**************[VIN obfuscated, can be read by forum staff]

[GiveMeABreak]

Ok, here you go and thank you for your Forum donation. Any further parts requests, you can post them up on this thread:

viewtopic.php?t=69962

Item (5) is the Siren, Part: 9677756080 £135.95
Item (1) is the Alarm ECU Part: 1607747880 £266.59

I've included both items just in case. These are available new direct from Citroen VAT inclusive as above, and you now have the part numbers in case you want to source a second hand unit.

Bear in mind that the siren and the alarm ECU have parameters that may need configuring.

[malawiboy1]

thanks for the diagram and part numbers m8.
is the a way to bypass it or stop it ?I have tried to disabling it in the Bsi it want let me disable it any suggestions how to bypass it ?

thanks in advance

sid

[GiveMeABreak]

None really apart from fixing it. If you have Diagbox, are there any fault codes after doing a global test?

[malawiboy1]

None really apart from fixing it. If you have Diagbox, are there any fault codes after doing a global test?

hi would you have the diagram location of the siren and the alarm unit located in the car?

[GiveMeABreak]

Siren (8605), ignore that it says 8602 - it's an error.



Alarm ECU (8602)

[malawiboy1]

Siren (8605), ignore that it says 8602 - it's an error.



Alarm ECU (8602)

thanks for your help have a nice day

[Imp100]

I have a Citroen c4 grand Picasso 2016 1.6 blue hdi I disconnected the battery to early and when I lock it the car the alarm sounds but if I open the bonnet and lock it it doesn’t go off so I’m going to try the switch and see what happens

[GiveMeABreak]

:Imp100: try this first of all and respect the timings and key / fob / hands free reinitialisation which are all included in the guide: BSI Reset / Battery Disconnect / Reconnect Procedure