Central locking system not working on 2 door coupe

[Fraz06]

Hey guys, the central locking on my 2 door e30 has never worked and i want to try and investigate the problem, when i lock the drivers door from the outside there is a click click noise coming from the drivers side footwell, the any idea's or suggestions on what this click click noise is and how to fix the full central locking system ?

thanks in advance

fraser

[smithy318i]

Lots for you to read through...

http://www.e30zone.net/e30zonewiki/inde ... g_problems

and...

http://www.e30zone.net/modules.php?name ... ic&t=79331

[Brianmoooore]

The wiki article is only relevant to about one in ten central locking faults. The thermal fuse in the ECU only fails for a reason, so the underlying cause should be dealt with before resoldering it, and ordinary solder MUST NOT be added to the joint.
The modification to the red/black wires will cure 90% of locking faults, and it is not necessary, or desirable, to dismantle the door hinge pillar plugs and sockets to do so. All the work can be done through the speaker hole.
Note that cabs have a slightly different wiring arrangement, for some reason known only to the E30's original designers, and you will have three red/black wires to connect together.