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Symptom List: HEATER IN LOCKOUT MODE Test Note: All symptoms listed above are diagnosed using the same tests. The title for the tests will be HEATER IN LOCKOUT MODE. When Monitored and Set Condition: HEATER IN LOCKOUT MODE When Monitored: During heater activation and operation. Set Condition: This DTC will set if multiple attempts to start the heater have failed or if successive overheating occurs. HEATER OVERHEATED When Monitored: After heater activation, when the system is in a steady state of operation. Set Condition: This DTC will set if the Temperature Sensor’s resistance or Overheating Sensor’s resistance is not within the expected parameters (coolant temperature in the SUCCESSIVE OVERHEATING When Monitored: After heater activation, when the system is in a steady state of operation. Set Condition: This DTC will set if successive overheating occurs. POSSIBLE CAUSES CABIN HEATER ASSEMBLY OR HEATER BOOSTER ASSEMBLY HEATER’S COOLANT HOSES RESTRICTED/LEAKING/DAMAGED ENGINE’S COOLING SYSTEM FAULT CABIN HEATER OR HEATER BOOSTER CONTROL UNIT HEATER OVERHEATED/SUCCESSIVE OVERHEATING CLEARED, ADDITIONAL DTC(S) 93 CABIN HEATER |