Viscosity is done with the red and yellow wires, bottom right side of the board. Yellow wires are for the "set" temp, red are used,for "over temp". Both yellow and red will have wires going to a common, simply remove the yellow wire from the common and you will no longer have viscosity, yet you will still have over temp protection. *had a thought prior to hitting enter, double check that red is going to over temp and yellow is going to set. Believe it is OLTS for set, and OLTO for the over....wonder if instead of commons landed, if they landed two wires on the OLTO if it would ignore hall calls....*
The parameters cannot be changed to remove it, and there is nothing that I can remember about any sort of inspection mode when on viscosity for those units. Make sure some mechanic didn't add a relay in there. Only thing I have seen that is remotely close to this is jack resync. When car has begun resync operation it ignores hall calls, but still responds to car calls.