B1D34-68: Heater In Lock Out Mode - Event information: Action

NOTE: For information only, rectify other stored fuel fired booster heater DTCs prior to this DTC

Using the manufacturer approved diagnostic system, record then clear any stored DTCs then perform routine - AHCM Operation Test (0x9013). This will operate the fuel fired booster heater for 15 minutes. Note that the routine should be started only when the engine is cool. The routine should be performed with the engine running and with the climate controls set to maximum heat and maximum fan. Repeat the routine again if smoke continues to be visible from the fuel fired booster heater exhaust pipe or from the area surrounding the fuel fired booster heater