B1811

Test 1:

Test 2 - 4:

Test 5:

Test 6:

SYMPTOM
B1811 HEATER OVERHEATED

WHEN MONITORED
After DCHA activation, when the system is in a steady state of operation.

SET CONDITION
This DTC will set if the Coolant Temperature Sensor resistance is not within the expected parameters (coolant temperature in the Heater Module exceeds 125° C [257° F]).

POSSIBLE CAUSES
- DCHA heater module fault
- DCHA coolant hoses restricted/leaking/damaged
- Engine's cooling system fault
- DCHA control unit fault
- B1811 cleared, additional DTC(s) present