Central locking relay, which wires?

Fri Jul 01, 2011 11:11 am

Can anyone advise me which wires I need to test for the unlocking action of the Unit as i can lock but not unlock,

thanks.

Fri Jul 01, 2011 12:15 pm

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

Try this link,you may find a bit to help you.

Fri Jul 01, 2011 12:20 pm

Thanks daimlerman, I've already worked my way through the wiki and done all the bits, I've narrowed it down to just the unlocking part not working so need to test for power to that side of it, just don't know which wires at the module.

Fri Jul 01, 2011 8:48 pm

Thanks willnz, I had almost given up. so if I rig a bulb or something to the green/blue and try to unlock I should see the bulb briefly light up, if it does It will be the module at fault is that right?

Fri Jul 01, 2011 9:21 pm

Thanks again willnz I will try tomorrow.

Mon Jul 11, 2011 5:53 pm

Bump for this as I'm having the opposite problem, i.e it will lock the doors and boot but not unlock them. I've grounded the green/light blue wire going to the central locking module but it makes no difference. Haven't tried the ground loop yet as I have a red/black and red/brown wire going to the A pillar connector. Or does the guide mean connect the red/black from the module to the red/black going to the A-pillar?

Wed Jul 13, 2011 5:29 pm

Anyone?

Wed Jul 13, 2011 7:17 pm

One red/black comes along the sill from the back and goes to the A pillar socket.
Another red/black comes from the locking module socket, loops into the interior light delay module socket and out again, and then goes to a different pin on the A pillar socket.
On cabs, the red/black does not loop from the locking socket to the light delay socket, but instead there are two separate red/black wires, one from the locking socket, and one from the light delay socket going directly both to the same pin on the A pillar socket.
Whether you have two wires or three going to the A pillar socket, cut them all away, and connect them all together so that the wire coming along the sill (the live power feed) goes directly to the lock and light delay sockets, without going anywhere near the A pillar socket.
The red/brown wire is for a completely different function, and is not part of this mod.

Wed Jul 13, 2011 9:22 pm

I'm currently waiting for a replacement module on mine as i've done all the checks/mods etc. Hopefully will cure mine when it arrives.

Thu Jul 14, 2011 4:44 pm

New (second hand) module arrived today, everything fitted and working. I guess I must just be unlucky this being the second time now, first one was waterlogged but the second one must have just, well, packed up i guess.

Thu Jul 14, 2011 9:45 pm

You have been very unlucky! I've never come across a dud one, other than those killed by water ingress.

Fri Jul 15, 2011 6:24 am

Brian the one I have just fitted is slightly different in that you cannot take it apart, unlike the old one where you can take the board out and inspect. Although its working fine does that seem right to you?

Fri Jul 15, 2011 9:19 am

jacko wrote:Brian the one I have just fitted is slightly different in that you cannot take it apart, unlike the old one where you can take the board out and inspect. Although its working fine does that seem right to you?

All the one's I've seen have been identical.

Sat Jul 16, 2011 6:49 pm

Tried the bypass but no joy for me. Oh well, it's not a major annoyance not having central locking, I don't have many friends anyway

Sat Jul 16, 2011 10:02 pm

Get stuck in and sort it! No central locking may not be a major annoyance (although it is a significant safety factor), but owning a BMW where everything on it doesn't work as it did when it left the factory should be.
Open up the module, plug it back in, and see if operating the two relays by hand locks and unlocks the car.