Central locking fault on front doors

[Jc414]

I am new to the forum but not new to 406 ownership.
Firstly many thanks for all the information that has kept my old 1999 saloon on the road for the last 100000 miles.
Possibly stupidly, I was tempted to a very clean 69K 2002 2.0 HDi Rapier Estate with a declared central locking fault.
(I thought I was getting an estate version of my old 99 2.0 HDi saloon but it's entirely different to drive.)

The unlock fob button flashes the indicators and turns on the interior light but does not open the locks.
The lock button activates the rear doors and tailgate solenoids but instantly unlocks again.
I cannot activate the central locking from either front door with the key in the barrel but I can manually lock the door.
If I open the rear doors with the ignition on I get a door open indication in the display.
If I open the front doors with the ignition on there is 'door open' indication at all.

Many thanks for all your suggestions I have tried so far. These include...
BSI reset as per the BBA Reman instructions.
Copious quantities of WD40 on the front door lock mechanisms.
Key fob reset

I suppose there is a possibility that both front door solenoids may be faulty but it seems a little unlikely.
I also wonder why the display doesn't recognise the front 'door open' and warn accordingly.

Many thanks for taking the time to read my post and for any suggestions you may have.

[V6Exec]

Last item on your list may be the clue - if the unit is not recognising the doors are open, I would suspect a wiring fault.

Are you able to trace wires from the locks through to the body and confirm that they are all working?

[Busman]

Last item on your list may be the clue - if the unit is not recognising the doors are open, I would suspect a wiring fault.

Are you able to trace wires from the locks through to the body and confirm that they are all working?

Just to add to this, they often go where the loom goes into the conduit between the doors and body.

[Jc414]

Many thanks for such rapid responses.
I will check the continuity of all the wires.
Only having the car a couple of days I am struck that it looks much younger than its 11 years but the rubber trims by the sill plates have been torn off through wear. Perhaps there has been more than average amount of door opens and shuts in its lifetime?
I will let you know how get on with my multimeter.

[Jc414]

Hmmmm. Both front door locks disconnected and signs of horrible abuse in the way the door membranes have been mangled. Reconnecting them worked for a while but a flat battery soon occurred.
I have a bigger problem to do Witt the Comm 2000 stalks or possibly the BSI which now means the wipers come on, which puts the headlights on, changes radio station and leaves me with no wiper or main beam control.
I would really appreciate some help with this.
Could you please advise if I should start a new thread concerning these issues?
Many thanks for all your advise and support

[Jc414]

FIXED. The comm 2000 is a Delphi unit which kept turning on wipers and lights.
Pulling it apart revealed no obvious soldering faults on pcb but distorting the board made things work perfectly.
It seems that the delphi pcb may be susceptible to cracking.
As a bodge I assembled it with a plastic bolt and nut which I have tightened to permanently bend the pcb.
I will fit a new one when it arrives.
Please let me know if you require any more info about the delpi comm 2000 and thanks for your help.

[djp30djp]

Hi guys, Mine has developed a fault.
Locked it one day and instead of a single flash it flashed repeatedly as if unlocking. repeated tries resulted in it doing nothing at all.
Tried to lock all the doors manually & found the O/S rear would not lock at all,so stripped the door out & found the rod from the locking botton disconnected.
Easy fix I thought but sadly not. all the doors now lock manually but none on the remote. When I press the remote I get the clunk from the rear doors but they don't lock.
Next move was to strip the front door & check the wiring. found a broken wire which I repaired but that only solved the mistery of why the puddle lights & memory seats only worked sometimes.
Did a BSI reset & key reset & left it overnight with all the doors locked manually.
Next morning pressed the button, clunk & flash flash flash, great I thought - briefly - then realised only the rear doors had unlocked. Boot & front doors still locked.
If I try to lock with the plip there is a clunk from the rear only, but no doors lock.
If I lock them manually & try to unlock, only the rear doors unlock.
Any Ideas please?
By the way it's a D9 estate but pre com2000.

[Jc414]

The solenoids on the front were really playing up on mine. I soaked them in wd40 but it was a temporary fix.
In the end I realised that the battery didn't always have the guts to provide the instantaneous current for all 4 solenoids on a cold morning.
I tried charging overnight and things were much improved.
Using the key instead of plip helped me concentrate on one issue at a time.
A few days later I ended up with starting problems, just not spinning fast enough to pressure up the hdi rail.
£47 quid for a new battery has made a huge difference.
All my locks now work as they should.
An oil change has also helped as I think someone had put cheapo 20w50 in... The 5w40 is much thinner cold and the engine spins easily. Mpg is up 5% too!
Maybe try an overnight charge to see if it works like it did for me? Or maybe get your battery checked?
I think that the comm 2000 fault on mine meant that things weren't shutting down overnight, lights were on the whole time and wipers going crazy when driving - that with treacle oil killed the battery in this chilly weather.
Let us know how you get on.

[GingerMagic]

Hi - there is a thread somewhere on the forum about low battery.
It caused all sorts of problems on mine - auto lights working on their own, mirrors moving on their own, auto-wipers going crazy when driving and only turning on when stationary, radio coming on at full volume etc.
Tried a bsi reset which only worked for a bit.
I charged battery up ( off the car ) overnight and its much much better. Most niggles have disappeared.
Worth a shot...

[pinafarina406]

TS, is it fixed now?

Had the same prob. Was the battery. But my battery showed no signs at all of fade or nearing its empty level. Initially thought it was the alternator but that was fine upon inspection of my local garage. But I learnt it the hard way. I got the services of my reliable locksmiths (http://www.lockmaster1.com/locksmiths-t ... heath.html) who are just down the road from me, because I couldn't get in one snowy morning and I was 100% sure it was just frozen locks so I called on the experts to get me in. Get me in they did, but the central locking was still playing up. So after paying and thanking the locksmiths on a job well done, I went to work and couldn't lock the car all day (eek) but after work all was well and headed straight to my local garage who fixed the underlying problem. So from my POV i paid for two services instead of just the one - lesson learnt. Don't leave problems with the locks to linger on for too long otherwise you might get locked out like I did.