Help me break in to my C3?

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Think: Manual Gearbox, Seats, Bodywork, Lighting, Interior, A/C, Heater, Wheels, Steering, Brakes, Tyres and Suspension
My Name: StevieR

Member
Posts: 2
Joined: Tue Aug 02, 2022 8:44 am
Model: C3 2002-2005, Original shape model
Year: 2004 (04)
Engine Size: 1.6
Fuel Type: Diesel
Mileage: 80000
Trim Level: VTR+
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)

Post

Chitrun wrote: Mon Mar 28, 2022 9:40 am Hi, here we are again in 2022, the same problem as has been posted for many years! Yes, I can only enter to driver side with a key and when it locks inside you are stuck in it - so dangerous. I bough thte little car for my daughter to learn to drive so I just want to have the doors open without risk of them locking.

Anyhow I read with interest and I can see that there is a fix to get them open by sending direct 12v into the plug, I tried this but NOTHING happened. I am using a piece of wire directly off a 12z battery and sending +12V to 15 and earth to 13 to unlock but nothing is happening. I'm wondering if I am doing something wrong? is this what you mean by sending 12v pulse?

Any help really appreciated.
I followed exactly the instructions on page one of this thread. It worked for my 4-door 2004 C3. Car battery must be disconnected. Remove plug from the board. I used a length of 1.5mm stiff wire (lighting circuit stuff). 2.5mm might also work. Passenger and one rear door unlocked immediately. The other rear door did not but I figured the locking mechanism might be a bit stiff, so I then reversed the wires and sent a 'lock' signal repeatedly, followed by the unlock signal. This worked a treat and all 3 doors open ok. To test, I then shut all dorrs while inside the car and pressed the child lock button (as the rear doors were still 'child locked.' This immediately locked all doors so back to the same problem. I was hoping it would release the rear child-lock but it didn't. Went through the procedure again, and again unlocked all doors successfully, even if the child-lock is still on the 2 rear doors. My feeling with regard that year C3 is that in many respects it was under-engineered and in the 12 years we've had it, it's been a constant problem with mechanical failures and we wish we had never bought it!
My Name: StevieR

Member
Posts: 2
Joined: Tue Aug 02, 2022 8:44 am
Model: C3 2002-2005, Original shape model
Year: 2004 (04)
Engine Size: 1.6
Fuel Type: Diesel
Mileage: 80000
Trim Level: VTR+
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)

Post

On page one of this thread, there is a grid showing the 12v pulses to achieve various outcomes. I used the unlock successfully, but have a question about the child-unlock solution: +12v to pins 13, 15 and 16. Daft question perhaps, but what do I do with the negative wire from the battery I am using? - do i put that to the vehicle ground/chassis? many thanks.
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