Q: My 1991 peugeot 205 has a central locking problem. Once the key is inserted and twisted, all doors are locked. But there is no way to unlock all the doors again. Its a pain as i have to unlock the boot, to them reach in and unlock the door. Once inside the car, pulling the lock up and down locks and unlocks all the doors. is there any common problems that can be resolved easily, or should i just take it to a garage and get them to sort it out. Thanks.
A: Frankie G had a good answer, but by now you have probably tried the passenger door already, to save a climb through the hatch back / boot. 50% of the electrical problems I have with my 205's (I have 3 running now) are due to a bad ground wire. BUT not always. I have the 1991 205 electrical schematic in front of me now. ONLY the driver's door lock motor is grounded with wire M. Wire M is one of 4 wires. The other doors and the boot lock have only two wires on the "motors". It is a miracle that your boot unlocks reliably. (see below) Ground wire M goes directly to the driver's electric window SWITCH , if you have that. It may be called wire M1 and/or M2 at that point. ATTENTION: there is no promise that "driver's door" means the right side (UK), but begin there. The wiring harness / loom may be fabricated on the continent for LEFT hand driver's doors. The electrical schematic will not differ. The other 3 wires are: 100? 108? goes to fuse 7 for 12 volts. 200? 208? goes directly to the opposite door and a spliced-in wire goes to the boot lock. 201? 201A? also goes to opposite door and a spliced-in wire goes to the boot lock. MAYBE?? each door lock mechanism is grounded to the door metal by its own metal edges?? This would provide a "lift circuit" and a "depress circuit", each one commonly grounded. My guess now is that the circuit that moves the locks UPWARD is broken. Moving locks downward is fine. Is that circuit 200 or 201? You must test with a 12 volt lamp in-hand. Electricity is somehow getting to the boot, but not the doors. Try using 6 feet of any old wire to prove the fault of a bad / broken connection. If your temporary wire works, voila! good luck, sir.