Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Honda >> 2005 >> Pilot EX >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heating/Air Conditioning >> Symptom Troubleshooting Index

Symptom Troubleshooting Index

SYMPTOM TROUBLESHOOTING CHART

Symptom Diagnostic procedure Also check for
Recirculation control doors do not change between Fresh and Recirculate Recirculation control motor circuit troubleshooting (see RECIRCULATION CONTROL MOTOR CIRCUIT TROUBLESHOOTING )
Blower, heater controls, and A/C do not work Heater control power and ground circuit troubleshooting (see HEATER CONTROL POWER AND GROUND CIRCUIT TROUBLESHOOTING  )
  • HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION  )
  • Blown fuse No. 3 (7.5 A) in the driver's under-dash fuse/relay box
  • Poor ground at G401
  • Cleanliness and tightness of all connectors
The A/C compressor clutch does not engage (but both fans run at high speed with the A/C on) A/C compressor clutch circuit troubleshooting (see A/C COMPRESSOR CLUTCH CIRCUIT TROUBLESHOOTING  )
  • HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION  )
  • Blown fuse No. 59 (7.5 A) in the under-hood fuse/relay box, and No. 3 (7.5 A) in the driver's under-dash fuse/relay box
  • Cleanliness and tightness of all connectors
A/C system does not come on (both fans and the A/C compressor do not work); heater is OK A/C pressure switch circuit troubleshooting (see A/C PRESSURE SWITCH CIRCUIT TROUBLESHOOTING  )
Rear blower motor runs, but one or more speeds do not work Rear blower motor circuit troubleshooting (see REAR BLOWER MOTOR CIRCUIT TROUBLESHOOTING  )
Rear blower motor does not run at all Rear blower motor circuit troubleshooting (see REAR BLOWER MOTOR CIRCUIT TROUBLESHOOTING  )
Rear mode control doors do not change between ceiling vents (cool) and floor vents (hot) Rear mode control motor circuit troubleshooting (see REAR MODE CONTROL MOTOR CIRCUIT TROUBLESHOOTING  )
  • HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION  )
  • Blown fuse No. 3 (7.5 A) in the driver's under-dash fuse/relay box
  • Poor ground at G501
  • Cleanliness and tightness of all connectors
Both fans do not run at low speed with the A/C on (but the A/C compressor runs with the A/C on) Radiator and A/C condenser fan low speed circuit troubleshooting (see RADIATOR AND A/C CONDENSER FAN LOW SPEED CIRCUIT TROUBLESHOOTING  )
  • HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION  )
  • Blown fuse No. 58 (30 A) in the under-hood fuse/relay box, and No. 3 (7.5 A) in the driver's under-dash fuse/relay box
  • Poor ground at G201
  • Cleanliness and tightness of all connectors
The A/C condenser fan does not run at high speed (but both fans run at low speed and the A/C compressor operates with the A/C on) A/C condenser fan high speed circuit troubleshooting (see A/C CONDENSER FAN HIGH SPEED CIRCUIT TROUBLESHOOTING  )
  • HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION  )
  • Blown fuse No. 3 (7.5 A) in the driver's under-dash fuse/relay box
  • Poor ground at G201
  • Cleanliness and tightness of all connectors
Both fans do not run at high speed with the A/C on (but both fans run at low speed and the A/C compressor operates with the A/C on) Radiator and A/C condenser fan high speed circuit troubleshooting (see RADIATOR AND A/C CONDENSER FAN HIGH SPEED CIRCUIT TROUBLESHOOTING  )
Blower fan runs slower than expected in cold weather ECT Troubleshooting (see DTC P0117: ECT SENSOR 1 CIRCUIT LOW 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.
Both fans run at high speed all the time with the A/C on Radiator and A/C condenser fan high speed circuit troubleshooting (see RADIATOR AND A/C CONDENSER FAN HIGH SPEED CIRCUIT TROUBLESHOOTING  )
scientia non olet · About Mike's Workshop Manuals