Cabin Heater Control High or Open (Active)

Test 1 - Test 2:

Test 3:

SYMPTOM
CABIN HEATER CONTROL HIGH OR OPEN (ACTIVE)

POSSIBLE CAUSES
- Cabin heater or heater booster control unit
- Cabin heater control circuit shorted to voltage
- Automatic temperature control (ATC)
- Cabin heater control circuit open
- Automatic temperature control (ATC)