Heating Symptom Troubleshooting

NOTE: Before performing symptom troubleshooting, check for DTCs

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. 30 (7.5A) in the under-dash fuse/relay box
  • Cleanliness and tightness of all connectors
 
Both heater and A/C do not work Audio-HVAC module power and ground circuits troubleshooting 
  • HVAC DTCs
  • Blown fuse No. 30 (7.5A) in the under-dash fuse/relay box
  • Poor ground at G503
  • Cleanliness and tightness of all connectors