PDF SBR switch is related to the battery-door switch.

NC switch on right side of machine on battery-door.
To prevent driving when battery-door is openend.
Very often the wiring of this switch is getting between door and chassis, resulting in broken wiring.

For testing purpose, just remove switch, connect the 2 wires so master will see this as a NC contact.
If unsuccesfull, wiring is broken.

Connection on pumpcontroller E12, wire 68 switches to E4 common wire 222 (A trough E)

Good luck!