306 central locking

Hiskey · Unread post by **Hiskey** » 15 Apr 2004, 22:15

I own a 306 XRDT and recently whenever i lock the car either with fob or with key, all the doors lock and then immediately unlock straight away. It used to be an intermitant fault where if the doors didn't lock 1st time, I would slam them with great force and on 2nd attempt they would work.
Unfortunately, this doesn't work anymore and the car has to be left permanently unlocked.
I understand that 306's have lots of faults with the locking system but can anyone tell me where to start?

jameso · Unread post by **jameso** » 17 Apr 2004, 17:57

My car does exactly the same it realy pissed me off I have found a way to lock the car for the moment before I undertake fixing it.
Right open one of the rear doors and reach in and lock the drivers and passenger doors together keeping your fingers on the lock stopping them coming back up, next lock both the rear doors then use the key to lock the boot. I have posted a message on this problem and had a lot of replys so if there is a way of searching my postings then you will find all the suggestions I had. Found it
http://www.andyspares.com/discussionfor ... IC_ID=4820
Regards
Jameso

bad driver · Unread post by **bad driver** » 17 Apr 2004, 18:13

I had a similar problem, try removing the 'button' of the bar on the drivers lock and see if it works then. Its a common fault for it to get too bar down the bar over time and prevent it from locking fully. If it works then put the button back on but try not to let it go to far down the bar.

solara · Unread post by **solara** » 19 Apr 2004, 14:19

I also experienced central locking problems on my Peugeot 306 XTDT. When you try and lock the car (either via the remote or via the door key switch), it attempts to lock all doors, but then immediately unlocks all doors. This is a security feature should a door not be closed or locked properly.
As others suggested, this is a fault with either the central locking latch switches or wiring. Trying to find the faulty latch or break in the wire is painstaking and tedious. Typically all these switches are connected in series, so any one single faulty switch will trigger the auto-unlock feature.
After hours of probing around the central locking control unit, I have now been able to identify the closed loop circuit which detects all latches have locked. I have been able to manually bypass the sensors, so the control unit "thinks" that all latches have locked okay. This prevents it from auto-unlocking.
For me, this is acceptable, as all my latches lock okay, and the fault lies within the closed loop sensor circuit. Obviously, now if I leave a door open and lock the car, it still "thinks" its locked okay. For me, this is better than no central locking! Also its not worth me spending a fortune on getting the dealer to change the faulty latches, especially when my car is now 10 years old.
For those interested in my noddy workaround...
Step 1: Locate the central locking unit
On my 306 XTDT 1993 model, the central locking control unit, is behind the rear passenger seat (off-side/driver side). It is NOT under the drivers seat as told by the Haynes manual, that is actually the alarm control unit and engine immobiliser!
Step 2: Remove the unit
The central locking control unit is accessed, by folding the rear-seat and lifting the boots carpet next to the seat edge, where there are three screws. Open these, and pull out the central locking control unit from behind the seat. There is no need to disconnect the electrical connectors.
Step 3: Bypass the sensor circuit
There are two plug connectors, one black and one white, connected to the unit. To bypass the latch sensor circuit, connect a wire between M623(yellow/green wire) and 6293(blue wire), both of these wires come out of the black connector. All this can be done with the connector in situ.
Black connector
M623: yellow/green wire in corner of connector
6293: blue wire in same row as above, one hop away.
By shorting this circuit, it effectively closes the loop circuit, telling the control unit that all latches are locked okay.
Hay Presto, you have now disabled the pesky auto unlock feature! Try it by leaving a door open and locking the car, it will lock, but not auto-unlock. You could use this method to identify which lock is actually at fault, as any lock which opens after locking is the culprit.
Hope it works for you

tnunn · Unread post by **tnunn** » 19 Apr 2004, 22:04

I just fixed the same problem on my 306. Seems to be a very common fault and is usually down to broken wires in the wiring harness for the drivers door. The Peugeot garage sold me a new harness for £50 and after a long and tedious soldering job everything now works perfectly.