The supply module and the DEF hose heaters are a part of the vehicle DeNox system. The system heating temperature is controlled via the engine ECU.
What you need?
2026 AGCO EDT Diagnostic Software
ECU connection
The pin numbers at the ECU:
K25 Supply module heater relay low side
K92 Pressure hose heater relay low side
K50 Suction hose heater relay low side
K26 Return hose heater relay low side
K20 DEF heater feedback line
K73 DEF heater relay control high side
K94 DEF heater relay control Low side
The SCR heater pinout is shown in figure The SCR heater connections.
