won't remote unlock/lock

big mistake · Post Thu Feb 18, 2021 9:12 pm

Hello, I'm the not so proud owner of a 2008 1.6hdi C3. Bought it 2 days ago for £750. Seemed fine at the time which is why I bought it. However, when I got home and tried locking it with the key - nothing. Tried the other key - nothing. Locked driver's door manually - no activation of central locking. Googled what to do and came upon the many threads posted here. I followed EVERY procedure to the letter - nothing. Noticed one comment about wires 4 and 7 in aftermarket stereo so the following morning (having finally manually locked all the doors apart from the hatch the night before) I removed the stereo to see if it would make a difference - nothing. The central locking button on the dash locks the car so the mechanism works. Fault code about 'faulty side light' even though all the lights are fine. Went through some of the procedures again - nothing. Took the door panel off to investigate wiring but found nothing. Ordered an original stereo from eBay for £16 and am hoping that I can get it synchronised to the BMI/ECU. My question is how do I do this without spending loads of money? Do I need to get the keys re-set? They have new batteries. Also got underneath and sorted out rusted back box brackets, seized rear wheel, water in the headlight and got rid of the disgusting cigarette smell. Also on closer inspection 2 of the tyres have a different speed index. Want to get it sorted and get it MOTed before the end of march and swap it for a Peugeot Partner (I know someone who might be up for doing this). Please help. Am I going about this the right way? Also I noticed in the fault reader socket, one of the lower pins is missing. Have I just bought a turkey or is this normal?

C3driver52 · Post Thu Feb 18, 2021 10:06 pm

Hello big mistake

big mistake wrote: ↑Thu Feb 18, 2021 9:12 pm Hello, I'm the not so proud owner of a 2008 1.6hdi C3. Bought it 2 days ago for £750. Seemed fine at the time which is why I bought it. However, when I got home and tried locking it with the key - nothing. Tried the other key - nothing. Locked driver's door manually - no activation of central locking. Googled what to do and came upon the many threads posted here. I followed EVERY procedure to the letter - nothing. Noticed one comment about wires 4 and 7 in aftermarket stereo so the following morning (having finally manually locked all the doors apart from the hatch the night before) I removed the stereo to see if it would make a difference - nothing. The central locking button on the dash locks the car so the mechanism works.

The stereo problem only makes a difference overnight, so it won't apply to you trying to remote lock directly after a drive.

I guess the remote locking/unlocking worked when you bought it?
If not, you probably won't get it working again without buying NEW keys.

You can reset the C3 BSI (this would explain why it looks like two bad keys).

You can try to re-sync the keys by following the C3 key re-sync procedure.

You can have the keys tested by an auto locksmith for an output (you may be very unlucky to have two faulty keys) to see if the keys are working (remote lock/unlock) or not.

If the keys are good, you may have a faulty COM2000 receiver and this is often found that the remote lock only works inside the car with the key very close to the steering wheel.

big mistake · Post Fri Feb 19, 2021 2:56 am

Thanks for the information. I already tried all the tricks. Nothing happens. Is there a way to bypass the computer and simply be able to lock and unlock the car via the driver's door? I can't afford to spend hundreds of £'a on a new/used ecu/radio/fuse box and key set up, let alone have the enthusiasm to strip it all out and re-fit it. There must be a way. Anyone know how to make the central locking work via the driver's door manual lock? And any advice on the sidelight warning would be really appreciated.

smokescreen · Post Fri Feb 19, 2021 9:48 am

I can't help you with the locking problem but once I had a sidelight bulb failure warning and I couldn't see any front or rear lamp failure. However on closer inspection it was one of the two number plate lamps that had blown.

Arfur Dent · Post Fri Feb 19, 2021 1:22 pm

big mistake wrote: ↑Fri Feb 19, 2021 2:56 am Thanks for the information. I already tried all the tricks. Nothing happens. Is there a way to bypass the computer and simply be able to lock and unlock the car via the driver's door? I can't afford to spend hundreds of £'a on a new/used ecu/radio/fuse box and key set up, let alone have the enthusiasm to strip it all out and re-fit it. There must be a way. Anyone know how to make the central locking work via the driver's door manual lock?

Unfortunately not.

The C3 2002 locking system was very advanced in its day and the same system is still in use today.

There is a fix for the BSI fuses, but that means taking out the BSI, finding a donor, stripping them both apart and swapping donor bits from one to the other. This avoids the need to reprogram the computer but gets the 'relays' working again. Did you find that the BSI is faulty? You won't want to get to that level without doing some diagnostics for that and lexia is the only tool that will work, another thing that you may not want to get involved with.

Looks like you will be trading it in or sending it to auction for someone else to have a go.

And any advice on the sidelight warning would be really appreciated.

The idea is one question per topic. You need another topic for different questions.

C3Noob · Post Sat Feb 20, 2021 2:20 pm

Hi m8 you have the same issue as me with the doors, i have found a temp fix that at least might help you in the short term

There is a manual door lock on each door

: C3-Passenger--Door-Locks.png (250.23 KiB) Viewed 574 times

remove the black tape thats covering it, turn it outwards with your key while holding the door handle open.
close the door and let go of the handle and your door is locked.
do this for each door and manually lock the drivers door as normal.

Ozvtr · Post Sun Feb 21, 2021 8:54 pm

big mistake wrote: ↑Thu Feb 18, 2021 9:12 pm Hello, I'm the not so proud owner of a 2008 1.6hdi C3. Bought it 2 days ago for £750. Seemed fine at the time which is why I bought it. However, when I got home and tried locking it with the key - nothing. Tried the other key - nothing. Locked driver's door manually - no activation of central locking. Googled what to do and came upon the many threads posted here. I followed EVERY procedure to the letter - nothing. Noticed one comment about wires 4 and 7 in aftermarket stereo so the following morning (having finally manually locked all the doors apart from the hatch the night before) I removed the stereo to see if it would make a difference - nothing. The central locking button on the dash locks the car so the mechanism works. Fault code about 'faulty side light' even though all the lights are fine. Went through some of the procedures again - nothing. Took the door panel off to investigate wiring but found nothing. Ordered an original stereo from eBay for £16 and am hoping that I can get it synchronised to the BMI/ECU. My question is how do I do this without spending loads of money? Do I need to get the keys re-set? They have new batteries. Also got underneath and sorted out rusted back box brackets, seized rear wheel, water in the headlight and got rid of the disgusting cigarette smell. Also on closer inspection 2 of the tyres have a different speed index. Want to get it sorted and get it MOTed before the end of march and swap it for a Peugeot Partner (I know someone who might be up for doing this). Please help. Am I going about this the right way? Also I noticed in the fault reader socket, one of the lower pins is missing. Have I just bought a turkey or is this normal?

Are they the rectangular flip type?

Have you contacted the previous owner? How did they lock the car?

Have you sat in the car, manually locked the doors from the button on the dash and tried unlocking the doors using the remotes?

The driver side door lock is NOT connected to the central locking IN ANY WAY. It's effectively for emergency use only.

Ozvtr · Post Sat Feb 27, 2021 8:47 am

big mistake wrote: ↑Fri Feb 26, 2021 6:02 pm Keys tested at locksmiths and are sending a signal. Next step is coms2000. Can't get steering wheel off. Tried to follow YouTube video but don't want to apply too much force invade I set the airbag off. Any tips?

Its unlikely to be the HF module in the COMs as it also handles the key immobilizer transponder. So if you can start the car, the HF module would appear to be working.

big mistake · Post Sat Feb 27, 2021 9:29 am

Thanks everyone - I'm at a loss with what to try next. Theres no point removing the steering wheel if the Coms unit is not faulty. Any idea where to investigate?

big mistake · Post Sat Feb 27, 2021 9:35 am

Could there be a fuse or an earth I am missing somewhere? The car has been fitted with an aftermarket stereo. I got an original stereo to fit (if I can find a reasonable price to re-programme the vin code). the block connector and ariel fit the original but the aftermarket stereo has live and earth wires from somewhere else that don't fit in the OEM stereo. could these be causing a short circuit for the key fob activation? The OEM stereo I tried for size and apart from the beeping due to VIN incompatibility, there was no information on the display unit.

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