martyuk
Well-Known Member
- Posts
- 824
- Location
- Swindon, UK
Don't put 12V on the Black wire - it's connected to ground and in the rear doors is only connected to the door open switch - to tell the BECM if the door is open or not.
By default the 3 wires to the 2 locking motors are all grounded in the relay, as they are a double-coil twin contact relay to allow for polarity changes.
The Superlocking motor is ONLY used when superlocking the vehicle, it doesn't need to be operated at all when unlocking the door.
The Locking/Unlocking relay in the BECM holds the Orange wire to ground, and pulses 12V on the Pink wire to lock the door normally. If you superlock it, then it will first pulse the Pink wire with 12V to lock the door, then pulse BOTH the Pink and Orange/Pink with 12V to superlock. The superlocking motor only moves a spring loaded pawl (that usually stops the latch mechanism at 'Locked') out of the way so that the mechanism will move all the way to 'Superlocked'
To unlock the door, all you need to do is ground the Pink wire, and pulse 12V on the Orange wire, and this will drive the Central Locking motor back in the unlock direction. You might need to pulse it twice, as sometimes with the resistance of the springs etc in there the first pulse will drive it back to normal 'Lock' and the second will then drive it all the way to 'Unlock'
If you can't get the door card off whilst the door is closed, then with the front door open, you should be able to access the rear door wiring through the B pillar. Pull the rubber sheath away from the bodywork side, and then you should be able to pull the connector(s) out of the bodywork, unplug them, and then have access to the wires you need - they run directly to the latch from there.
Hope this helps,
Marty
By default the 3 wires to the 2 locking motors are all grounded in the relay, as they are a double-coil twin contact relay to allow for polarity changes.
The Superlocking motor is ONLY used when superlocking the vehicle, it doesn't need to be operated at all when unlocking the door.
The Locking/Unlocking relay in the BECM holds the Orange wire to ground, and pulses 12V on the Pink wire to lock the door normally. If you superlock it, then it will first pulse the Pink wire with 12V to lock the door, then pulse BOTH the Pink and Orange/Pink with 12V to superlock. The superlocking motor only moves a spring loaded pawl (that usually stops the latch mechanism at 'Locked') out of the way so that the mechanism will move all the way to 'Superlocked'
To unlock the door, all you need to do is ground the Pink wire, and pulse 12V on the Orange wire, and this will drive the Central Locking motor back in the unlock direction. You might need to pulse it twice, as sometimes with the resistance of the springs etc in there the first pulse will drive it back to normal 'Lock' and the second will then drive it all the way to 'Unlock'
If you can't get the door card off whilst the door is closed, then with the front door open, you should be able to access the rear door wiring through the B pillar. Pull the rubber sheath away from the bodywork side, and then you should be able to pull the connector(s) out of the bodywork, unplug them, and then have access to the wires you need - they run directly to the latch from there.
Hope this helps,
Marty
