Heating Symptom Troubleshooting (Without A/C)

Heating Symptom Troubleshooting

Symptom Diagnostic procedure Also check for
Recirculation control doors do not change between Fresh and Recirculate Recirculation control motor circuit troubleshooting
HVAC DTCs
Blown fuse No. 36 (10 A) in the under-dash fuse/ relay box
Cleanliness and tightness of all terminals

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 G504
Cleanliness and tightness of all terminals

Symptom	Diagnostic procedure	Also check for
Recirculation control doors do not change between Fresh and Recirculate	Recirculation control motor circuit troubleshooting	HVAC DTCs Blown fuse No. 36 (10 A) in the under-dash fuse/ relay box Cleanliness and tightness of all terminals
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 G504 Cleanliness and tightness of all terminals