This link to Key Fob receiver wiring problems may assist:
Remote central locking wiring fault and the way round it. | LandyZone - Land Rover Forum
This post in AULRO addresses fob issues:
Key fob not locking/unlocking
Best wishes with the solution
Jeffoir
'98 Disco 1 V8 (Gone) Young family; so much fun...
'00 Disco 2 V8 (Gone) Mrs Jeffoir's...
'02 Disco 2 V8 (Gone) What a lovely exhaust note...
'07 Disco 3 HSE TDV6 400,000km. Still going strong...
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