Symptom Troubleshooting Index

WARNING: This page is about a different car, the 2008 Acura TSX, 2007 Acura TSX, 2006 Acura TSX, 2005 Acura TSX, and 2004 Acura TSX. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Before doing symptom troubleshooting, check for body DTCs (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ), and powertrain DTCs (see GENERAL TROUBLESHOOTING INFORMATION ).

DTC 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 HOW TO CHECK FOR DTCS WITH THE HDS ) Blown fuse No. 30 (7.5 A) in the under-dash fuse/relay box Cleanliness and tightness of all connectors
Blower, heater controls, and A/C do not work	Climate control power and ground circuits troubleshooting (see CLIMATE CONTROL POWER AND GROUND CIRCUIT TROUBLESHOOTING )	HVAC DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS ) Blown fuse No. 30 (7.5 A) in the under-dash fuse/relay box Poor ground at G503 Cleanliness and tightness of all connectors
The A/C condenser fan does not run at all (but the radiator fan runs with the A/C on)	A/C condenser fan circuit troubleshooting (see A/C CONDENSER FAN CIRCUIT TROUBLESHOOTING )	HVAC DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS ) Blown fuse No. 9 (20 A) in the under-hood fuse/relay box, and No. 30 (7.5 A) in the under-dash fuse/relay box Poor ground at G201 Cleanliness and tightness of all connectors
Both fans do not run with the A/C on (but the A/C compressor runs with the A/C on)	Radiator and A/C condenser fans common circuit troubleshooting (see RADIATOR AND A/C CONDENSER FAN COMMON CIRCUIT TROUBLESHOOTING )	HVAC DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS ) Blown fuse No. 9 (20 A) and No. 11 (20 A) in the under-hood fuse/relay box, and No. 30 (7.5 A) in the under-dash fuse/relay box Cleanliness and tightness of all connectors
The A/C compressor clutch does not engage (but both fans run with the A/C on)	A/C compressor clutch circuit troubleshooting (see A/C COMPRESSOR CLUTCH CIRCUIT TROUBLESHOOTING )	HVAC DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS ) Blown fuse No. 9 (20 A) in the under-hood fuse/relay box, and No. 30 (7.5 A) in the under-dash fuse/relay box Cleanliness and tightness of all connectors Blower motor operation
A/C system does not come on (both fans and the A/C compressor do not work); heater is OK	A/C pressure switch and thermal protector circuit troubleshooting (see A/C PRESSURE SWITCH AND THERMAL PROTECTER CIRCUIT TROUBLESHOOTING )	HVAC DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS ) Cleanliness and tightness of all connectors
Blower fan runs slower than expected in cold weather	('04-05 models) ECT troubleshooting (see DTC P0116: ECT SENSOR CIRCUIT RANGE/ PERFORMANCE PROBLEM ('04-05 MODELS) ) ('06-08 models) ECT sensor 2 circuit low voltage (see DTC P2184: ECT SENSOR 2 CIRCUIT LOW VOLTAGE ('06-08 MODELS) ), ECT sensor 2 circuit high voltage (see DTC P2185: ECT SENSOR 2 CIRCUIT HIGH VOLTAGE ('06-08 MODELS) ) 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.	Powertrain DTCs (see GENERAL TROUBLESHOOTING INFORMATION )
HDS does not communicate with the climate control unit or the vehicle	Troubleshoot the DLC circuit; '04-06 models (see DLC CIRCUIT TROUBLESHOOTING ), '07-08 models (see '07-08 MODELS )
AUTO button does not work	Turn the ignition switch ON (II). Press the off button, then press the AUTO button and check the display. If AUTO is displayed, but the climate control is not working properly, check for DTCs with the HDS (see HOW TO CHECK FOR DTCS WITH THE HDS ), or go to HOW TO RETRIEVE A DTC (WITHOUT HDS) self-diagnosis . If AUTO is not displayed, check for poor connections at the climate control connector. If the connections are OK, replace the audio-HVAC display panel.	Climate control power and ground circuit troubleshooting (see CLIMATE CONTROL POWER AND GROUND CIRCUIT TROUBLESHOOTING )
OFF button does not work	Turn the ignition switch ON (II). Press the AUTO button, then press the OFF button and check the display. If the climate control display turns off, check for DTCs with the HDS (see HOW TO CHECK FOR DTCS WITH THE HDS ), or go to HOW TO RETRIEVE A DTC (WITHOUT HDS) self-diagnosis . If the climate control display does not turn off, replace the audio-HVAC display panel.	Faulty relays (see POWER RELAY TEST )
Dual button does not work	Turn the ignition switch ON (II). Press the AUTO button, then press the DUAL button several times and check the DUAL button LED. The LED should toggle on and off as the button is pressed. If the LED turns on or off, go to HOW TO RETRIEVE A DTC (WITHOUT HDS) self-diagnosis . If the LED does not turn on or off, replace the audio-HVAC display panel.
Recirculation button does not work	Turn the ignition switch ON (II). Press the recirculation button and check the operation of the button's LED. If the LED turns on, go to RECIRCULATION CONTROL MOTOR TEST . If the LED does not turn on, replace the audio-HVAC display panel.
Defroster button does not work	Turn the ignition switch ON (II). Press the AUTO button, then press the defroster button several times and check the button's LED. The LED should toggle on and off as the button is pressed. If the LED turns on and off, check for DTCs with the HDS (see HOW TO CHECK FOR DTCS WITH THE HDS ), or go to HOW TO RETRIEVE A DTC (WITHOUT HDS) self-diagnosis . If the LED does not turn on or off, replace the audio-HVAC display panel.
Rear window defogger button does not work	Turn the ignition switch ON (II). Press the rear window defogger button several times and check the button's LED. The LED should toggle on and off as the button is pressed. If the LED turns on and off, go to FUNCTION TEST rear window defogger troubleshooting . If the LED does not turn on or off, replace the audio-HVAC display panel.
MODE button does not work	Turn the ignition switch ON (II). Press the MODE button and check the display. If the display scrolls through the modes as the MODE button is pressed, check for DTCs with the HDS (see HOW TO CHECK FOR DTCS WITH THE HDS ), or go to HOW TO RETRIEVE A DTC (WITHOUT HDS) self-diagnosis . If the display does not scroll through the modes as the MODE button is pressed, replace the audio-HVAC display panel.
Fan control button does not work	Turn the ignition switch ON (II). Press the AUTO button, then adjust the fan control button up/down and check the display. If the display indicates the fan speed selection up/down, check for DTCs with the HDS (see HOW TO CHECK FOR DTCS WITH THE HDS ), or go to HOW TO RETRIEVE A DTC (WITHOUT HDS) . If the display does not indicate the fan speed selection up/down, replace the audio-HVAC display panel.
TEMP control button does not work	Turn the ignition switch ON (II). Press the AUTO button, then adjust the TEMP control button up/down and check the display. If the display indicates the change in temperature up/down, check for DTCs with the HDS (see HOW TO CHECK FOR DTCS WITH THE HDS ), or go to HOW TO RETRIEVE A DTC (WITHOUT HDS) self-diagnosis . If the display does not indicate the change in temperature up/down, replace the audio-HVAC display panel.
Passenger's TEMP button does not work	Turn the ignition switch ON (II). Press the AUTO button. Press the Dual button then the passenger's TEMP button up/down and check the display. If the display indicates the change in temperature up/down for the passenger's side, check for DTCs with the HDS (see HOW TO CHECK FOR DTCS WITH THE HDS ), or go to HOW TO RETRIEVE A DTC (WITHOUT HDS) self-diagnosis . If the display does not indicate the change in temperature up/down, replace the audio-HVAC display panel.
Climate control does not work with voice control (with navigation)	Voice control troubleshooting, '04-05 models (see VOICE CONTROL DOES NOT WORK/RESPOND ), '06-08 models (see VOICE CONTROL DOES NOT WORK/RESPOND ).
Climate control will not run self-diagnosis	Turn the ignition switch ON (II). Press the AUTO button, then the TEMP control button up/down and check the display If the display does not work, check for loose or poor connections at the audio-HVAC display module, and recheck. If the connections are OK, and the display still does not work, go to CLIMATE CONTROL POWER AND GROUND CIRCUIT TROUBLESHOOTING .
More than one button is not working	Climate control power and ground circuit troubleshooting (see CLIMATE CONTROL POWER AND GROUND CIRCUIT TROUBLESHOOTING )	HVAC DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS )
Audio-HVAC display/button illumination problems	Audio-HVAC display module illumination troubleshooting (see AUDIO-HVAC DISPLAY MODULE ILLUMINATION TROUBLESHOOTING )