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For Mr King - what appears to have happened is that your alarm ecu has had it's power interrupted when you were pulling plugs and relays out, and the fob(s) have become unsynchronized with the alarm ECU.
The recommended fix (as in the owner handbook) is to open the car with the key, and then push the lock button on the fob four times. This is also the same procedure if you fit new batteries to the fob.
If the road jumps up at you again, and the alarm ECU trips again - stop, turn ignition off, wait a few seconds and turn ignition back on, and the hazards should cancel.
For MA series owners only - non-alarm Discos have a blanking plug with a jumper wire installed in the loom connector for an alarm. If your alarm ecu keeps going off whilst off road, then you could temporarily disconnect your alarm, fit the blanking plug and re-fit the alarm when you get back on the tarmac.
Otherwise to remove the inertia switch means disassembling the ecu itself and unsoldering the component. I haven't found an ecu to play with so I can't say how easy or hard it is.
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Cool thanks langy, problem solved, sadly my mighty beast never came with an owners hand book, I should look into that when the motivation attacks me :D. but I think I solved the problem with the reset button which I found (I assume) as two little rubber plug type thingies about 1-2mm in diameter, in a plug mounted on the lh firewall between the washer bottle and the firewall, very indiscreet they looked like water proofing stopers in unused wire holes, any how I pushed them and now both remotes work like new (the second remote stoped working weeks before for no reason) so happy days all is well and the sun shines on me again hooray.