DTC B1D25-13: Heater Fuel Pump - Circuit open: Action

NOTE: To check the operation of the fuel fired booster heater, perform routine - Auxiliary Heater (AHCM) Activation Test (0x900A). Repeat the routine if excessive smoke is emitted from the fuel fired booster heater exhaust.

Refer to the appropriate system wiring diagrams and check the fuel fired booster heater fuel pump circuit for open circuit, high resistance. Repair the wiring harness or install a new fuel fired booster heater fuel pump as necessary