Heater In Lockout Mode

Test 1 - 3:

Test 4 - 5:

SYMPTOM
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.

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) present