( SMR7E55G24100000000HBAT00 )

Heating Symptom Troubleshooting

Symptom	Diagnostic procedure	Also check for
Blower and heater controls do not work	Heater control power and ground circuit troubleshooting	HVAC DTCs Blown fuse No. 36 (10 A) in the under-dash fuse/relay box Poor ground at G503 Cleanliness and tightness of all terminals
Both fans do not run at low speed	Radiator and A/C condenser fan low speed circuit troubleshooting	HVAC DTCs Blown fuse No. 18 (30 A) in the under-hood fuse/relay box Poor ground at G301 Cleanliness and tightness of all terminals
The A/C condenser fan does not run at high speed (but both fans run at low speed)	A/C condenser fan high speed circuit troubleshooting	HVAC DTCs Poor ground at G301 Cleanliness and tightness of all terminals
PTC heater does not work	PTC heater circuit troubleshooting	HVAC DTCs Blown fuse No. 26, 27, 28 (40 A) in the under-hood fuse/relay box, and No. 36 (10 A) in the under-dash fuse/relay box Poor ground at G401 Cleanliness and tightness of all terminals Powertrain DTCs
Blower fan runs slower than expected in cold weather	ECT troubleshooting: ECT sensor 2 circuit low voltage, ECT sensor 2 circuit high voltage NOTE: It is normal for the blower to run slowly until the engine coolant temperature begins to rise. If the blower continues to run slowly for an abnormal length of time, continue to troubleshoot the problem.	Powertrain DTCs
HDS does not communicate with the heater control unit or the vehicle	Troubleshoot the DLC circuit