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Symptom Troubleshooting Index

WARNING: This page is about a different car, the 2011 Honda Pilot, 2010 Honda Pilot, and 2009 Honda Pilot. However, it is still accessible from the selected car via links, so may be relevant.
SYMPTOM TROUBLESHOOTING TABLE

Symptom Diagnostic procedure Also check for
Rear mode control doors do not change between ceiling vents (cool) and floor vents (hot) See REAR MODE CONTROL MOTOR CIRCUIT TROUBLESHOOTING 
Voice communication does not work See NAVIGATION COMMUNICATION LINE CIRCUIT TROUBLESHOOTING 
Audio-HVAC does not display audio or climate control information See AUDIO COMMUNICATION LINE CIRCUIT TROUBLESHOOTING 
Blower, heater controls, and A/C do not work See CLIMATE CONTROL UNIT POWER, GROUND, AND COMMUNICATION CIRCUIT TROUBLESHOOTING 
  • Climate control unit DTCs (see GENERAL TROUBLESHOOTING INFORMATION  )
  • Blown fuse No. 36 (10A) in the under-dash fuse/relay box
  • Poor ground at G403
  • Poor or loose connections at the terminals
Both fans do not run at low speed with the A/C on (but the A/C compressor runs with the A/C on) See RADIATOR AND A/C CONDENSER FAN LOW SPEED CIRCUIT TROUBLESHOOTING
  • Climate control unit DTCs (see GENERAL TROUBLESHOOTING INFORMATION  )
  • Blown fuse No. 7 (30 A) in the under-hood fuse/relay box, and No. 36 (10 A) in the under-dash fuse/relay box
  • Poor ground at G202*1,G201*2
  • Poor or loose connections at the terminals
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) See A/C CONDENSER FAN HIGH SPEED CIRCUIT TROUBLESHOOTING
  • Climate control unit DTCs (see GENERAL TROUBLESHOOTING INFORMATION  )
  • Blown fuse No. 6 (30A) and No. 15 (7.5A) in the under-hood fuse/relay box
  • Poor or loose connections at the terminals
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) ECT troubleshooting: ECT sensor 2 circuit low voltage (see DTC P2184: ECT SENSOR 2 CIRCUIT LOW VOLTAGE ), ECT sensor 2 circuit high voltage (see DTC P2185: ECT SENSOR 2 CIRCUIT HIGH VOLTAGE )
The A/C compressor clutch does not engage (but both fans run with the A/C on) See A/C COMPRESSOR CLUTCH CIRCUIT TROUBLESHOOTING
  • Climate control unit DTCs (see GENERAL TROUBLESHOOTING INFORMATION  )
  • Blown fuse No. 20 (7.5A) in the under-hood fuse/relay box, and No. 36 (10A) in the under-dash fuse/relay box
  • Blower motor operation
  • Poor or loose connections at the terminals
Blower fan(s) runs slower than expected in cold weather ECT troubleshooting: ECT sensor 2 circuit low voltage (see DTC P2184: ECT SENSOR 2 CIRCUIT LOW VOLTAGE ), ECT sensor 2 circuit high voltage (see DTC P2185: ECT SENSOR 2 CIRCUIT HIGH VOLTAGE )
NOTE: It is normal for the blower(s) 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.
HDS does not communicate with the climate control unit or the vehicle Troubleshoot the DLC circuit (see DLC CIRCUIT TROUBLESHOOTING ) -
Insufficient heating
  1. Check the coolant level (see COOLANT CHECK )
  2. Check the radiator cap (see RADIATOR CAP TEST )
  3. Check the operation of the air mix control motor and door (see FRONT AIR MIX CONTROL MOTOR TEST )
  4. Check the coolant temperature
  5. Check the blower motor unit for obstructions
  6. Check for air leaks around the ducts and vents
  7. Check the inlet hose temperature

  • If it is COLD, check for restrictions in the hose, a damaged or leaking thermostat, and a damaged or leaking water pump.
  • If it is HOT, check for restrictions in the heater core. Back flush the heater core using standard commercially available equipment, or replace the heater core.
 Damaged cylinder head gasket
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