A big welcome here to Smeg from the Mondeo Enthusiast Group (the MEG bit), who is helping me as his electrical knowledge is far greater than mine.
Here he has designed a double locking interface so that all the aftermarket alarms that only provide a single locking pulse (most) can be adapted to provide the double pulse that the Mondy requires to deadlock fully. Hopefully if we are very nice to him he will design some more add-ons for us. Please route any feedback to me and I will pass it on
As with all add on's, neither me nor Smeg accept any responsibility for any problems you may have if you decide to fit this to your car
Central Locking Double Pulse
Interface and How to build it
One Shot Up
No Key Windows
Description:
Using the ford key, you unlock by simply turning to the left. However, to lock,
requires both an unlock turn and a lock turn - the kind of double key turn we
are all familiar with. - The Smeg interface simply emulates this action.
Looking at the diagram, relay R1 is used for the unlocking function. Relay R2 is used for the locking function. Both relays simply connect the common lines to the lock & unlock lines, for both the C-locking and D-locking, - exactly like a key turn would do. Bare in mind, your aftermarket alarm will supply lock/unlock signals for a duration of 0.5s up to 5s, the actual duration is irrelevant.
Unlock:
A +ve current is applied to the unlock input (U). It travels through D1 and
energises relay R1. This simply connects the C-locking common to the C-locking
unlock line, (having the effect of operating the C-locking motors), and connects
the D-locking common to the D-locking unlock line, (having the effect of
signalling the FF alarm to unlock the D-locks and disarm the FF alarm).
Lock:
Locking is slightly more complex.
A +ve current is applied to the lock input (L). It travels through both D2 and D3, and energises BOTH relays. R1 performs it's unlock function as stated above. However, R2 is also energised, but is prevented from performing the locking function because its 'common' lines are disconnected as R1 energises. - The relays will stay in this state for the duration of the 'lock' pulse supplied by your aftermarket alarm. When the 'lock' pulse has finished, R1 will de-energise, but R2 is held in place for a further duration of about 1 second because of capacitor C1. When R1 de-energises, it returns the 'common' lines to R2, enabling it to perform its lock function. - You can see from the above that the Smeg interface 'flicks' between unlock and lock, (emulating the double key turn), and gives the FF alarm the signals it's expecting, to engage the D-locks.
parts list:
the parts I have listed are all available from Maplin, and I have listed the Maplin part numbers.
| Part Number | Qty | Description | Cost |
| VH54J | 1 | Capaciter 2200uF 16V | £0.79 |
| QL73Q | 3 | Diode 1N001 | £0.05 |
| FJ43W | 2 | DPDT Relay 6A | £2.99 |
| KC91Y | 1 | Plastic Box | £1.29 |
total = £8.21
First Gather all the bits that you will need, The components, Wire cutters and strippers, Soldering Iron and solder, Wire etc
Don't forget the newspaper to solder on or your have holes in the bed!!!
Lay it out and start soldering the components together. If you tape the relays and capacitors like I have they are a nice tight fit in the box
Insulate it all and stick it in the box, make sure it cant move around and all is secure. Dont forget to label all the wires or you'll have a lot of fun later
The finished interface. Now I just have to go and put it in the car!!!!
Every One loves their One Shot Down feature on the drivers door, but here's how to add a One Shot Up. Don't forget to do this to the Passenger windows as well
This mod allows you to wind up or down the windows without the key, just by opening the drivers door. How many times have you got out and realised the windows are open, then had to find the key and turn it in the ignition, now the windows work if the door is open
Mad Moles Mondeo Madness, © Mad Mole 2001. You may see
the Molemobile fly past in the Sutton area (Surrey).
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