355 door locks, central locking

I have another problem, i can lock the doors from the inside with the lock switch on the console, but i can't unlock the doors with the unlock switch, i tried swapping the switches to see if there was a problem with the unlock switch but it's the same.

Could it be some sensor inside the doors not functioning?

 

Can you unlock it with the fob? (and the external key?)

The only sensor is the internal microswitch in the lock actuator assembly. It needs to change state when the actuator plunger moves from fully extended to fully retracted (or vice versa).

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If you can unlock it with the fob, then the microswitches should be working properly. The console unlock switch wiring is in parallel with the alarm wiring (i.e. the wiring is spliced together).

Do you get any reaction from the unlock switch?

 

Yes i can unlock/lock with the FOB.

I swapped between the unlock and lock switch to be certain that there wasn't a problem with the switch, they both works in the lock position, but not unlock.

 

If the switch produces no clicking or cycling of the locks, then there must be a wiring issue between the switch and the window ECU.

Check there is an earth on both black wires on the console unlock switch connector.
Check continuity between the violet/white wire on the switch connector and pin 2M of the Door Locking ECU in the passenger footwell (You may have to remove the relay panel to get proper access to it). Removing the relay panel also allows access to the switch wiring.

Wiring diagram here:

5.2
https://www.dropbox.com/t/rBvxT9P2Ww6rPaYQ

2.7
https://www.dropbox.com/t/qwRbpLYFcjxEJ6ee

Sorry, I've forgotten in you have a 2.7 or 5.2

 

No Fobs on a 2.7. Still in the dark ages.

 

I have a afterrnarket FOB

 

Ooops.. I forgot that the immobiliser wiring on the 2.7 is only provisional. Plug 59302 exists (see diagram), but there is nothing on the other side of the plug (other than a jumper wire for the fuel pumps... not shown in the diagram)

Hmmm.... Old electricians' rule... "If in doubt... go to the last modification".

Anyway, check the basic wiring. If all seems normal, then figure out how the aftermarket fob interfaces with the car.

 

That changes everything.

 

Sorry, my eyesight is fading.... Check pin 2, not pin 2M... Anyway, whatever pin the violet/white wire is attached to.

 

If it's any easier, check the console switch output at either of the door plugs. You should get an earth on pin 6 when you activate the unlock switch (momentarily).

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The male side of the plug (not shown) on the A pillar will be a mirror image. Careful you don't bend the pins removing the plug.