Cabin Heater Inoperable From A/C - Heater Module (MTC)

Test 1 - 2:

Test 3 - 4:

SYMPTOM
CABIN HEATER INOPERABLE FROM A/C - HEATER MODULE (MTC)

POSSIBLE CAUSES
- DCHA activation criteria not met
- No PCI bus communication with FCM/HVAC module
- FCM or HAVC DTCs present
- FCM fault
- A/C - heater control module fault