Lights and wipers started on their own

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My Name: ssybrg10

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Posts: 13
Joined: Tue Nov 22, 2022 1:41 pm
Model: C3 2002-2005, Original shape model
Year: 2006 (06)
Engine Size: 1.4
Fuel Type: Diesel
Mileage: 118000
Trim Level: VTR+
Gearbox: Manual 5 speed
DPF: Yes
LHD or RHD: RHD
Engine name: DV4 16-valve diesel (90 PS)
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Hi there, I have a 1.4 Citroen c3 rhythm HDI 8V diesel car. It is a 2006 model.
I checked my cctv and it showed my lights going on at 5am in the dark. It stayed on for 3 mins until the battery was flat. I recharged the battery and put it back and the wipers and lights went on full, a few seconds later my starter motor started trying to turn the engine, even though the key was in my hand and not in the ignition.
I then purchased a brand new battery because I thought maybe it was that. When connecting it the exact same thing happened again. Wipers and lights, then a few seconds later the starter trying to turn the engine. I have checked all fuses and they are all good. I can’t get the obd reader to scan car as it says the ignition it not it’s the on position even though I put the key in and turned it to ignition position. I am pretty stumped and would like some assistance before buying new parts hoping to fix the issue. Thank you in advance if anyone has any information about this that I can use
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My Name: Ozvtr

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Model: C3 2002-2005, Original shape model
Year: 2003 (53)
Engine Size: 1.4 (8v)
Fuel Type: Petrol
Mileage: 80000
Trim Level: Other
Gearbox: Automatic PRND
DPF: No
LHD or RHD: RHD
Engine name: TU3 (75 PS)
Location: Brisbane, Australia.
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Hi and welcome.
There are a number of things that could make the lights and wipers go "on their own". But having the starter run by itself is one I haven't seen before.
For the "all CAN BUS" (post 2005) C3's there is a relay (R8) in the BSM (the engine bay fuse box) that runs the starter and this relay is driven from the electronic "brain" of the BSM. It's not directly controlled by switches. In the previous version of the C3 the starter was run directly from the ignition switch.
So my best guess is; the BSM is having a "brain fart"!
IF that is the case, the BSM can't be repaired. However the BSM is not "coded in" and can simply be replaced.

The switches in the COMs unit (the controller with the wiper and lights stalks) has known to be faulty and cause symptoms like what you mention, BUT, the ignition (starter) switch is directly connected to the BSM. So the COMs unit can't be the single-point-of -failure. The BSM is the only, potential, single-point-of-failure.

It IS possible that this is a CAN BUS (communications) error, however, I would have expected other modules to be effected.
My Name: ssybrg10

Contributor
Posts: 13
Joined: Tue Nov 22, 2022 1:41 pm
Model: C3 2002-2005, Original shape model
Year: 2006 (06)
Engine Size: 1.4
Fuel Type: Diesel
Mileage: 118000
Trim Level: VTR+
Gearbox: Manual 5 speed
DPF: Yes
LHD or RHD: RHD
Engine name: DV4 16-valve diesel (90 PS)
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Hi again, I noticed now there is an air bag failure on the screen that has the clock on it.
My Name: ssybrg10

Contributor
Posts: 13
Joined: Tue Nov 22, 2022 1:41 pm
Model: C3 2002-2005, Original shape model
Year: 2006 (06)
Engine Size: 1.4
Fuel Type: Diesel
Mileage: 118000
Trim Level: VTR+
Gearbox: Manual 5 speed
DPF: Yes
LHD or RHD: RHD
Engine name: DV4 16-valve diesel (90 PS)
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Is the BSM the whole box or just one relay. Sorry I have only heard of a bsi lol
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My Name: C3CAR

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Joined: Wed May 04, 2011 10:01 am
Model: C3 2002-2005, Original shape model
Year: 2002 (02)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 140000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: DV4 16-valve diesel (90 PS)
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ssybrg10 wrote: Wed Nov 23, 2022 10:56 am Is the BSM the whole box or just one relay. Sorry I have only heard of a bsi lol
Hi

you can find out about the BSI here

and what is inside the BSM module here


Did you get a lot of rain recently? Is sounds like water damage of the electrics.
My Name: ssybrg10

Contributor
Posts: 13
Joined: Tue Nov 22, 2022 1:41 pm
Model: C3 2002-2005, Original shape model
Year: 2006 (06)
Engine Size: 1.4
Fuel Type: Diesel
Mileage: 118000
Trim Level: VTR+
Gearbox: Manual 5 speed
DPF: Yes
LHD or RHD: RHD
Engine name: DV4 16-valve diesel (90 PS)
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There was a lot of rain yes, would this cause a permanent problem or would drying it off work?
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My Name: C3CAR

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Joined: Wed May 04, 2011 10:01 am
Model: C3 2002-2005, Original shape model
Year: 2002 (02)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 140000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: DV4 16-valve diesel (90 PS)
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ssybrg10 wrote: Wed Nov 23, 2022 11:44 am There was a lot of rain yes, would this cause a permanent problem or would drying it off work?
It may cause a permanent failure but it may still work after drying. Disconnecting the battery may help to cause less damage. Its all electronics, like a phone. Same thing happens with the car electronics as it does to a phone.

But why it got wet in the first place is important.

The C3 can endure massive downpours and not get damaged. I would imagine that yours is different in some way, blocked drainage, missing plastic covers etc, assuming that it is water damage.
My Name: ssybrg10

Contributor
Posts: 13
Joined: Tue Nov 22, 2022 1:41 pm
Model: C3 2002-2005, Original shape model
Year: 2006 (06)
Engine Size: 1.4
Fuel Type: Diesel
Mileage: 118000
Trim Level: VTR+
Gearbox: Manual 5 speed
DPF: Yes
LHD or RHD: RHD
Engine name: DV4 16-valve diesel (90 PS)
Been thanked: 1 time

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I shall do as advised, I may consider just buying the ban and install myself. I remember you saying that it does not need to be reprogrammed. Thank you soo much my friend. Your input is much appreciated
My Name: ssybrg10

Contributor
Posts: 13
Joined: Tue Nov 22, 2022 1:41 pm
Model: C3 2002-2005, Original shape model
Year: 2006 (06)
Engine Size: 1.4
Fuel Type: Diesel
Mileage: 118000
Trim Level: VTR+
Gearbox: Manual 5 speed
DPF: Yes
LHD or RHD: RHD
Engine name: DV4 16-valve diesel (90 PS)
Been thanked: 1 time

Post

Hi again, sorry to bother you As you mentioned the rain, it was raining the night that it went like that. I just poured a kettle of water over the windscreen and it all poured into the area where the suspension top mount bolt is. Is that supposed happen or should the windscreen stop the water from going into the engine side. Thank you
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My Name: C3CAR

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Posts: 2708
Joined: Wed May 04, 2011 10:01 am
Model: C3 2002-2005, Original shape model
Year: 2002 (02)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 140000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: DV4 16-valve diesel (90 PS)
Has thanked: 186 times
Been thanked: 103 times

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ssybrg10 wrote: Thu Nov 24, 2022 3:05 pm Hi again, sorry to bother you As you mentioned the rain, it was raining the night that it went like that. I just poured a kettle of water over the windscreen and it all poured into the area where the suspension top mount bolt is. Is that supposed happen or should the windscreen stop the water from going into the engine side. Thank you
I've not found water in the suspension area before, so I would imagine you have some missing covers/plastics in the engine bay?

The BSM has a tight fitting cover but they can be incorrectly fitted allowing water in.
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