Hi,
With all the switches that have to work in combination in order for the Top to operate, there's no reason to dismiss the possibility that it may be a couple of switches in combination which are causing the problem. The most notorious of these is the micro-switch in the Latch, followed by the P-brake switch (although if you're getting the dash light, it's working, the Top Relay uses the same circuit, so it's also getting the signal), and lastly the 'B' pillar switch. Stick a Pencil or Chopstick or something small in the Latch Reciever and make sure the switch moves freely. Hope this helps...
Happy Motoring!... Jim'99
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