Top warning light on DTC B1777

SouthArk370Z

I have next to no experience with convertible tops (zero with 370Z verts) but I spent several decades doing industrial instrument and electrical work. In my experience, a signal line is low-current and, in this case, would be used to energize a relay that sends power to the heating element. My guess is that the SOFT TOP CONTROL UNIT contains the relay(s) and your problem is with the circuit that tells the STCU to energize the relay. But that's just a guess.

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