Central locking doesn't work with key-fob - dash says "boot open"

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My Name: firstcar873

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Posts: 5
Joined: Sat Feb 20, 2021 2:06 pm
Model: C3 2013-2017 Facelift A51
Year: 2015 (65)
Engine Size: 1.2
Fuel Type: Petrol
Mileage: 75000
Trim Level: VTR+
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: LHD (Europe)
Engine name: EB2F PureTech 3-Cylinder (82 PS)
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Hi, I have a problem with the central locking on my 2015 C3 II VTi 82. The central locking mechanism doesn't seem to be working when I use the key fob. The locks click twice and the doors remain open. When I turn on the ignition, the dash displays "boot open" and the red warning light displays in the speed gauge.

Things I've tried:
  • When I'm in the car and I press the button on the dash, all doors lock (including the boot).
  • Checked backup light, that works
  • Checked license plate lights, those work
  • Checked rear lights, those work
  • I checked the positive terminal of the car's battery with the ground of the car and it's showing normal voltage.
  • Resetting the state of the doors by opening all doors + boot, turning on the ignition, closing them all again and retrying the key fob. Whenever this problem occurred in the past, this mitigated it and allowed locking with the key fob.
Does the central locking mechanism triggered by the dash lock button ignore the state of the boot? Where is the sensor that detects whether the boot is open or closed? Could you guys point me in the right direction for troubleshooting this issue?

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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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firstcar873 wrote: Sat Feb 20, 2021 5:24 pm Hi, I have a problem with the central locking on my 2015 C3 II VTi 82. The central locking mechanism doesn't seem to be working when I use the key fob. The locks click twice and the doors remain open. When I turn on the ignition, the dash displays "boot open" and the red warning light displays in the speed gauge.
Hi

The doors won't lock if one of the doors (or boot) is open (or seen by the BSI as open).

This is the doors remain open, the boot is stopping the car from locking.

You may have a mechanical problem or an electrical problem with the boot latch, but I would think your problem is with that and the central locking will sort itself out if you can fix the boot.

I don't know if its electrical or mechanical, you may have to investigate to see if you can lock it and unlock it with the boot open by simulating the closing process with a screwdriver, test the switch or just try to change the whole thing.
My Name: firstcar873

Member
Posts: 5
Joined: Sat Feb 20, 2021 2:06 pm
Model: C3 2013-2017 Facelift A51
Year: 2015 (65)
Engine Size: 1.2
Fuel Type: Petrol
Mileage: 75000
Trim Level: VTR+
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: LHD (Europe)
Engine name: EB2F PureTech 3-Cylinder (82 PS)
Has thanked: 2 times
Been thanked: 1 time

Post

So, I took your advice and tested the latch mechanism with a screwdriver.

This is the normal state (1), when the boot is opened:

photo5875146538441881961.jpg

Pushing up with a screwdriver leads to this state (2), where the dash displays "boot open":

photo5875146538441881962.jpg

And pushing it up even further leads to this state (3), where the dash display no longer displays "boot open":

photo5875146538441881963.jpg

I tried closing the boot forcefully, and I think I managed to trigger state 3 doing that. Now the key fob closes all doors again! Thanks! Would this be resolved by just replacing the locking mechanism like you suggested?
User avatar
My Name: C3CAR

Guru
Posts: 2634
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: 154 times
Been thanked: 90 times

Post

firstcar873 wrote: Sat Feb 20, 2021 5:58 pm I tried closing the boot forcefully, and I think I managed to trigger state 3 doing that. Now the key fob closes all doors again! Thanks! Would this be resolved by just replacing the locking mechanism like you suggested?
It is only an idea. but I think we are on the right track.

You can change the part and if it works, great 8-)

If it doesn't work then we know it's not that and need to look further.

It is well worth trying as you managed to force it the work and the message clears.
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