Cabin Heater Inoperable From Auto Temp Control (ATC)

Test 1 - 2:

Test 3:

Test 4:

SYMPTOM
CABIN HEATER INOPERABLE FROM AUTO TEMP CONTROL (ATC)

POSSIBLE CAUSES
- DCHA activation criteria not met
- No PCI bus communication with FCM/ATC
- FCM or ATC DTCs present
- FCM fault
- Auto temp control fault