Initially I didn't buy another module, I was able to try one out of a car with a working softtop and rollbar. Basically it couldn't have been anything else. I of course didn't bother the rollbar control module which really just deploys the rollbar in an emergency situation, normal operation is actually through the soft top control module. The point I knew it was the module was when the AST unit would communicate with everything on the car but the module, it was basically a process of logical deduction combined with the prior testing.
Regards,
Tee

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