Ok, I got a chance to peek at the FSM to clarify
post #70. The run/stop/start switch is indeed used to reset error codes. The ABS hydraulic unit test is the same as the Gen I & Gen II.
My Gen I FSM had a separate ABS service manual. The Gen III FSM breaks up the ABS information. How the ABS works is covered in the front of the manual in the FEATURES, the hydraulic test is in with brake bleeding, starting on 4-70 and the troubleshooting starts in section 8-117.
The How-To procedure has been updated to that Gen 1 through Gen 3 is covered by the instructions.