Central Locking

[carl325i]

My 4dr 325i central locking has just given up, there is no sign of power anywhere also does anyone know which no fuse it runs through, its worked fine for the whole 2 weeks ive owned the car also the drivers door wont lock on the key anymore? any help will be appreciated.

[keith52]

Check your connections where they run into the door frame pillar (drivers side to start off with ), sometimes they need a clean , black plastic plug multipin connection> Could be the relay which is situated behind the drivers side footwell speakerr emove speaker and right at the bottom there's a phillips screw which you undo to remove the unit They can be tested but not sure of the link to get you to that info or its a simple remove and plug in replacement Not sure of cost from main dealer or buy 2nd hand from here Cheers Keith

[carl325i]

I'll av alook in the am and try to resolve the prob cheers Carl.

[Taylor325i]

Fuse no. 27 (30amp)

Taylor.

[blakep82]

i wondered what that relay holder was. my central locking doesn't work either, and there's no relay in the holder... What type of relay would it be?

[Brianmoooore]

i wondered what that relay holder was. my central locking doesn't work either, and there's no relay in the holder... What type of relay would it be?

It's not a relay as such. It's an electronic control unit, although it has a couple of relays in it.
Don't confuse it's connector with the usually empty socket for an interior light delay module, which is nearby.

[Brianmoooore]

I'll av alook in the am and try to resolve the prob cheers Carl.

Don't do random messing around - you'll cause more problems than you solve.
First step is to remove the locking ECU from its habitat in the sill. as described above, and test, with a 12V 5W or 10W lamp, whether there is power between the red/black wire on the ECU and the car body.

[blakep82]

i wondered what that relay holder was. my central locking doesn't work either, and there's no relay in the holder... What type of relay would it be?

It's not a relay as such. It's an electronic control unit, although it has a couple of relays in it.
Don't confuse it's connector with the usually empty socket for an interior light delay module, which is nearby.

can the light delay be used by fitting the relay? i've seen the control box down there too actually, i'll check it out too

[Brianmoooore]

Light delay can be used by fitting the module and a bit of nearby wire swapping.
Modules are fairly rare in E30s, but same module was used in some 5 and 7 series of a similar age.

[carl325i]

job all done and all fixed just replaced the red/black wire with a new feed from the fuse box as the voltage was 3volts works fine now cheers for the info.

[Brianmoooore]

All you needed to do was find two seperate red/black wires going to the driver's door pillar socket, cut them both off, and join them together.