Symptom Troubleshooting Index

WARNING: This page is about a different car, the 2008 Honda Pilot, 2007 Honda Pilot, and 2006 Honda Pilot. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM TROUBLESHOOTING INDEX

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 )	HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION ) Blown fuse No. 3 (7.5 A) in the driver's underdash fuse/relay box Cleanliness and tightness of all terminals
The blower motor does not run immediately even though the engine is fully warmed up	NOTE: The temperature control dial or button must be set between 57°F (24°C) and 87°F (31°C) and the engine coolant temperature is above 104°F (40°C) ECT sensor 1 circuit troubleshooting (see ECT SENSOR 1 CIRCUIT TROUBLESHOOTING )	Cleanliness and tightness of all terminals
Blower, heater controls, and A/C do not work	Climate control power and ground circuit troubleshooting (see CLIMATE CONTROL POWER AND GROUND CIRCUIT TROUBLESHOOTING )	HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION ) Blown fuse No. 3 (7.5 A) in the driver's underdash fuse/relay box Poor ground at G401 Cleanliness and tightness of all terminals
Voice communication does not work	Navigation communication line circuit troubleshooting (see NAVIGATION COMMUNICATION LINE CIRCUIT TROUBLESHOOTING )	HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION ) Cleanliness and tightness of all 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)	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 underhood fuse/relay box, and No. 3 (7.5 A) in the driver's underdash fuse/relay box Poor ground at G202 Cleanliness and tightness of all 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)	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 underdash fuse/relay box Poor ground at G201 Cleanliness and tightness of all 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)	Radiator and A/C condenser fan high speed circuit troubleshooting (see RADIATOR AND A/C CONDENSER FAN HIGH SPEED CIRCUIT TROUBLESHOOTING )	HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION ) Cleanliness and tightness of all terminals
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 )	HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION ) Cleanliness and tightness of all terminals
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 underhood fuse/relay box, and No. 3 (7.5 A) in the driver's underdash fuse/relay box Cleanliness and tightness of all terminals
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 )	HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION ) Cleanliness and tightness of all terminals
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 underdash fuse/relay box Cleanliness and tightness of all terminals
Blower fan runs slower than expected in cold weather	ECT Troubleshooting: ECT sensor 1 circuit low voltage (see DTC P0117: ECT SENSOR 1 CIRCUIT LOW VOLTAGE ), ECT sensor 1 circuit high voltage (see DTC P0118: ECT SENSOR 1 CIRCUIT HIGH VOLTAGE ) NOTE: It is normal for theblower 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 (see GENERAL TROUBLESHOOTING INFORMATION )