Climate Control System Acura TL III

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A/C SERVICE TIPS AND PRECAUTIONS

The air conditioning system uses HFC-134a (R-134a) refrigerant and polyalkyleneglycol (PAG) refrigerant oil, which are not compatible with CFC-12 (R-12) refrigerant and mineral oil. Do not use R-12 refrigerant or mineral oil in this system, and do not attempt to use R-12 servicing equipment; damage to the air conditioning system or your servicing equipment will result. Use only service equipment that is U.L.-listed and is certified to meet the requirements of SAE J2210 to remove R-134a from the air conditioning system.

If accidental system discharge occurs, ventilate work area before resuming service.

R-134a service equipment or vehicle air conditioning systems should not be pressure tested or leak tested with compressed air.

Additional health and safety information may be obtained from the refrigerant and lubricant manufacturers.

1. Always disconnect the negative cable from the battery whenever replacing air conditioning parts.
2. Keep moisture and dirt out of the system. When disconnecting any lines, plug or cap the fittings immediately; don't remove the caps or plugs until just before you reconnect each line.
3. Before connecting any hose or line, apply a few drops of refrigerant oil to the O-ring.
4. When tightening or loosening a fitting, use a second wrench to support the matching fitting.
5. When discharging the system, use an R-134a refrigerant recovery/recycling/charging station; don't release refrigerant into the atmosphere.

A/C REFRIGERANT OIL REPLACEMENT

Recommended PAG oil: DENSO ND-OIL 8

1. P/N 38897-PR7-A01AH: 120 ml (4 fl.oz)
2. P/N 38899-PR7-A01: 40 ml (1 1/3 fl.oz)

Add the recommended refrigerant oil in the amount listed if you replace any of the following parts.

1. To avoid contamination, do not return the oil to the container once dispensed, and never mix it with other refrigerant oils.
2. Immediately after using the oil, reinstall the cap on the container, and seal it to avoid moisture absorption.
3. Do not spill the refrigerant oil on the vehicle; it may damage the paint; if it gets on the paint, wash it off immediately.

A/C condenser ....... 25 ml (5/6 fl.oz)

Evaporator .......... 45 ml (1 1/2 fl.oz)

Line or hose ........ 10 ml (1/3 fl.oz)

Receiver/Dryer ...... 10 ml (1/3 fl.oz)

Leakage repair ...... 25 ml (5/6 fl.oz)

A/C compressor ...... For A/C compressor replacement, subtract the volume of oil drained from the removed A/C compressor from 120 ml (4 fl.oz), and drain the calculated volume of oil from the new A/C compressor: 120 ml (4 fl.oz) - Volume of removed A/C compressor = Volume to drain from new A/C compressor.

Note. Even if no oil is drained from the removed A/C compressor, don't drain more than 50 ml (1 2/3 fl.oz) from the new A/C compressor.

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1. Make sure the ignition switch is OFF.
2. Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
3. Turn the ignition switch ON (II).
4. Select DTCs in the body electrical/climate control mode MENU of the HDS.
5. Check for DTCs. If a DTC is indicated, go to the next step. If no DTC(s) is indicated, refer to «SYMPTOM TROUBLESHOOTING»(/acura/tl/iii-2003-2006/remont/entertainment-systems/#audio-system) .
6. Turn the ignition switch OFF.
7. Disconnect the HDS from the DLC.
8. Do the troubleshooting procedure for the DTC indicated.

How to Retrieve a DTC (Without HDS)

The climate control unit has a self-diagnostic function. To run the self-diagnostic function, do the following

Note. Before troubleshooting the climate control system, refer to B-CAN System Diagnosis Test Mode A Troubleshooting (see TROUBLESHOOTING -- B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

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1. Turn the ignition switch ON (II).
2. Press and hold the OFF button. While holding the OFF button, press the recirculation button five times within 10 seconds. Release the OFF button and the self-diagnostic will begin. NOTE: The blower motor can be run at any speed regardless of what the panel is displaying. With Navigation System If there is any problem in the system, the temperature indicator will light up the segment (A through S) corresponding to the error. The temperature indicator will then alternate every second between displaying "88" (all segments lit) and the error code segment (A through S). To determine the meaning of the DTC, refer to the DTC Troubleshooting Index. If there are no problems detected, the segments will not illuminate. Canceling the Self-diagnostic Function
3. Turn the ignition switch OFF to cancel the self-diagnostic function. After completing repair work, run the self-diagnostic function again to make sure that there are no other malfunctions.

Checking DTCs by DTC Indicator

Note. Before troubleshooting the climate control system, refer to B-CAN System Diagnosis Test Mode A Troubleshooting (see TROUBLESHOOTING -- B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

To retrieve the DTC, you must run the self-diagnostic function. In the case of multiple problems, the respective indicator segments will come on. If indicator segments A, C, E, G, I, L, O and Q come on at the same time, there may be an open in the common ground wire.

DRIVER'S TEMPERATURE INDICATOR

PASSENGER'S TEMPERATURE INDICATOR

Scheme 12

Displaying Sensor Inputs at the Climate Control Unit

The climate control unit has a mode that displays sensor inputs it receives. This mode shows you what the climate control unit is receiving from each of the sensors, one at a time, and it can help you determine if a sensor is faulty.

Check these items before using the sensor input display mode

1. Turn the ignition switch ON (II), and check the recirculation door function; press the recirculation button to switch from FRESH to RECIRC. The air volume and sound should change slightly.
2. Set the temperature control knob to the desired test temperature. When selecting the test temperatures, note these items: "Lo" temperature setting will default to MAX COOL, VENT, and RECIRC. "Hi" temperature setting will default to MAX HOT, FLOOR, and FRESH. 61 through 89°F settings will use the automatic climate control logic.
3. Turn the ignition switch OFF.

To run the sensor input display mode, follow these steps

1. Turn the ignition switch OFF.
2. Press and hold both the passenger's AUTO and recirculation buttons, then start the engine.
3. After the engine starts, release the buttons. The display panel control unit will flash the sensor number and then the value for that sensor. Record the value displayed.
4. To advance to the next sensor, press the recirculation button. SENSOR ITEM DISPLAY Sensor Item Displayed Value 1 In-car Temperature Sensor °C 2 Outside Air Temperature Sensor °C 3 Solar Radiation Sensor Value: Dark = 00, Flashlight = 04, Cloudy =10, Sunny = 65 kcal/m 2 .h 4 Engine coolant Temperature °C 5 Evaporator Outlet Air Temperature °C 6 Driver's Air Mix Opening (Low value indicates cooler air distribution, higher value indicates warmer air distribution) % of opening 7 Passenger's Air Mix Opening (Low value indicates cooler air distribution, higher value indicates warmer air distribution) % of opening 8 Vehicle Speed (Vehicle must be driven to display speed) km/h 9 Vent Temperature Air Out (TAO) °C NOTE: The sensor values will be displayed in degrees Celsius (°C) or an alphanumeric code. Use the table to convert the value to degrees Fahrenheit (°F). If the sensor value displays "Er," this indicates there is an open or short in the circuit or sensor. Check for DTCs using the HDS, or refer to checking DTCs by DTC indication to check for DTCs. If necessary, compare the sensor input display to an alike, known-good vehicle under the same test conditions. If the sensor is out of the normal range, refer to the sensor test, or substitute the sensor with a known-good, and recheck.
5. To cancel the sensor input display mode, press the AUTO button, or turn the ignition off.

Celsius to Fahrenheit Conversion Table

CELSIUS TO FAHRENHEIT CONVERSION TABLE

CELSIUS TO FAHRENHEIT CONVERSION

Alphanumeric Conversion Table

ALPHANUMERIC CONVERSION TABLE

Checking the DTCs by HDS

DIAGNOSTIC TABLE

DIAGNOSTIC TABLE

System Description

The air conditioning system removes heat from the passenger compartment by circulating refrigerant through the system.

Scheme 13

This vehicle uses HFC-134a (R-134a) refrigerant which does not contain chlorofluorocarbons. Pay attention to the following service items

1. Do not mix refrigerants CFC-12 (R-12) and HFC-134a (R-134a). They are not compatible.
2. Use only the recommended polyalkyleneglycol (PAG) refrigerant oil (DENSO ND-OIL 8) designed for the R-134a A/C compressor. Intermixing the recommended (PAG) refrigerant oil with any other refrigerant oil will result in A/C compressor failure.
3. All A/C system parts (compressor, discharge line, suction line, evaporator, A/C condenser, receiver/dryer, expansion valve, O-rings for joints) are designed for refrigerant R-134a. Do not exchange with R-12 parts.
4. Use a halogen gas leak detector designed for refrigerant R-134a.
5. R-12 and R-134a refrigerant servicing equipment are not interchangeable. Use only a recovery/recycling/charging station that is U.L.-listed and is certified to meet the requirements of SAE J2210 to service R-134a air conditioning system.
6. Always recover the refrigerant R-134a with an approved recovery/recycling/charging station before disconnecting any A/C fitting.

A/C Pressure Switch

The A/C pressure switch consists of a high-low pressure switch (A/C pressure switch A) and a middle pressure switch (A/C pressure switch B).

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1. High-low pressure switch If the refrigerant pressure becomes too high (due to blockage or lack of airflow at the A/C condenser), or too low (due to leakage), the A/C pressure switch stops the A/C request signal to the ECM/PCM and the A/C compressor stops operating.
2. Middle pressure switch If the refrigerant pressure goes above 1,470 kPa (15.0 kgf/cm 2 , 213 psi), the A/C pressure switch closes to signal the ECM/PCM to change the speed of the A/C condenser fan and radiator fan to high when the refrigerant pressure drops below 1,075 kPa (10.1 kgf/cm 2 , 156 psi), the A/C pressure switch opens to signal the ECM/PCM to change the speed of the A/C condenser fan and radiator fan to low.

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Dual Mode Control System

All modes (except defroster) can be controlled independently.

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This system automatically controls the temperature and the vent mode of the air direction to the driver and passenger's side depending on the angle of the sun, and the direction of the vehicle. It calculates information such as date, time, longitude, and latitude from the navigation system, as well as the irradiate strength of the sun from the sunlight sensor, to determine the appropriate mode position and temperature to be directed to each side.

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In the event that the navigation system malfunctions, or when driving in areas where the navigation cannot determine the vehicle position (non-coverage areas, tunnels, etc.), the climate control system will operate the same as a vehicle without navigation.

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DTC Troubleshooting

DTC TROUBLESHOOTING INDEX

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1. Clear the DTC by turning the ignition switch OFF, and then ON (II).
2. Operate the climate control system in several modes.
3. Check for DTCs using the self-diagnostic or HDS. Is DTC B1225 or A indicated? YES - Go to step 4 . NO - Intermittent failure, check for loose wires or poor connections on the in-car temperature sensor circuit.
4. Turn the ignition switch OFF.
5. Remove the in-car temperature sensor (see «IN-CAR TEMPERATURE SENSOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system) ) and test it (see «IN-CAR TEMPERATURE SENSOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system) ). Does the in-car temperature sensor test OK? YES - Go to step 6 . NO - Replace the in-car temperature sensor.
6. Disconnect climate control unit connector A (20P).
7. Check for continuity between the No. 15 terminal of climate control unit connector A (20P) and the No. 2 terminal of the in-car temperature sensor 2P connector. Is there continuity? YES - Go to step 8 . NO - Repair open in the wire between the climate control unit and the in-car temperature sensor.
8. Check for continuity between the No. 5 terminal of climate control unit connector A (20P) and the No. 1 terminal of the in-car temperature sensor 2P connector. Is there continuity? YES - Check for loose wires or poor connections at climate control unit connector A (20P) and at the in-car temperature sensor 2P connector. If the connections are good, substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit. NO - Repair open in the wire between the climate control unit and the in-car temperature sensor.

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1. Clear the DTC by turning the ignition switch OFF, and then ON (II).
2. Operate the climate control system in several modes.
3. Check for DTCs using the self-diagnostic or HDS. Is DTC B1226 or B indicated? YES - Go to step 4 . NO - Intermittent failure.
4. Turn the ignition switch OFF.
5. Remove the in-car temperature sensor (see «IN-CAR TEMPERATURE SENSOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system) ) and test it (see «IN-CAR TEMPERATURE SENSOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system) ). Does the in-car temperature sensor test OK? YES - Go to step 6 . NO - Replace the in-car temperature sensor.
6. Disconnect climate control unit connector A (20P).
7. Check for continuity between the No. 15 terminal of climate control unit connector A (20P) and body ground. Is there continuity? YES - Repair short to body ground in the wire between the climate control unit and the in-car temperature sensor. NO - Go to step 8 .
8. Check for continuity between the No. 15 terminal and the No. 5 terminal of climate control unit connector A (20P). Is there continuity? YES - Repair short in the wires between the climate control unit and the in-car temperature sensor. NO - Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit.

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1. Clear the DTC by turning the ignition switch OFF, and then ON (II).
2. Operate the climate control system in several modes.
3. Check for DTCs using the self-diagnostic or HDS. Is DTC B1227 or C indicated? YES - Go to step 4 . NO - Intermittent failure, check for loose wires or poor connections on the outside air temperature sensor circuit.
4. Turn the ignition switch OFF.
5. Remove the outside air temperature sensor (see «OUTSIDE AIR TEMPERATURE SENSOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system) ) and test it (see «OUTSIDE AIR TEMPERATURE SENSOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system) ). Does the outside air temperature sensor test OK ? YES - Go to step 6 . NO - Replace the outside air temperature sensor.
6. Disconnect climate control unit connector A (20P).
7. Check for continuity between the No. 16 terminal of climate control unit connector A (20P) and the No. 1 terminal of the outside air temperature sensor 2P connector. OUTSIDE AIR TEMPERATURE SENSOR 2P CONNECTOR Wire side of female terminals Is there continuity? YES - Go to step 8 . NO - Repair open in the wire between the climate control unit and the outside air temperature sensor.
8. Check for continuity between the No. 5 terminal of climate control unit connector A (20P) and the No. 2 terminal of the outside air temperature sensor 2P connector. Is there continuity? YES - Check for loose wires or poor connections at climate control unit connector A (20P) and at the outside air temperature sensor 2P connector. If the connections are good, substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit. NO - Repair open in the wire between the climate control unit and the outside air temperature sensor.

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1. Clear the DTC by turning the ignition switch OFF, and then ON (II).
2. Operate the climate control system in several modes.
3. Check for DTCs using the self-diagnostic or HDS. Is DTC B1228 or D indicated? YES - Go to step 4 . NO - Intermittent failure.
4. Turn the ignition switch OFF.
5. Remove the outside air temperature sensor (see «OUTSIDE AIR TEMPERATURE SENSOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system) ) and test it (see «OUTSIDE AIR TEMPERATURE SENSOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system) ). Does the outside air temperature sensor test OK ? YES - Go to step 6 . NO - Replace the outside air temperature sensor.
6. Disconnect climate control unit connector A (20P).
7. Check for continuity between the No. 16 terminal of climate control unit connector A (20P) and body ground. Is there continuity? YES - Repair short to body ground in the wire between the climate control unit and the outside air temperature sensor. NO - Go to step 8 .
8. Check for continuity between the No. 16 terminal and the No. 5 terminal of climate control unit connector A (20P). Is there continuity? YES - Repair short in the wires between the climate control unit and the outside air temperature sensor. NO - Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit.

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1. Clear the DTC by turning the ignition switch OFF, and then ON (II).
2. Operate the climate control system in several modes.
3. Check for DTCs using the self-diagnostic or HDS. Is DTC B1229 or E indicated? YES - Go to step 4 . NO - Intermittent failure, check for loose wires or poor connections on the sunlight sensor circuit.
4. Turn the ignition switch OFF.
5. Test the sunlight sensor (see «SUNLIGHT SENSOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system) ). Is the sunlight sensor OK? YES - Go to step 6 . NO - Replace the sunlight sensor.
6. Disconnect the sunlight sensor 2P connector.
7. Disconnect climate control unit connector A (20P).
8. Check for continuity between the No. 17 terminal of climate control unit connector A (20P) and the No. 2 terminal of the sunlight sensor 2P connector. Is there continuity? YES - Go to step 9 . NO - Repair open in the wire between the climate control unit and the sunlight sensor.
9. Check for continuity between the No. 5 terminal of climate control unit connector A (20P) and the No. 1 terminal of the sunlight sensor 2P connector. Is there continuity? YES - Check for loose wires or poor connections at climate control unit connector A (20P) and at the sunlight sensor 2P connector. If the connections are good, substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit. NO - Repair open in the wire between the climate control unit and the sunlight sensor.

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1. Clear the DTC by turning the ignition switch OFF, and then ON (II).
2. Operate the climate control system in several modes.
3. Check for DTCs using the self-diagnostic or HDS. Is DTC B1230 or F indicated? YES - Go to step 4 . NO - Intermittent failure.
4. Turn the ignition switch OFF.
5. Test the sunlight sensor (see «SUNLIGHT SENSOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system) ). Is the sunlight sensor OK? YES - Go to step 6 . NO - Replace the sunlight sensor.
6. Disconnect the sunlight sensor 2P connector.
7. Disconnect climate control unit connector A (20P).
8. Check for continuity between the No. 17 terminal of climate control unit connector A (20P) and body ground. Is there continuity? YES - Repair short to body ground in the wire between the climate control unit and the sunlight sensor. NO - Go to step 9 .
9. Check for continuity between the No. 17 terminal and the No. 5 terminal of climate control unit connector A (20P). Is there continuity? YES - Repair short in the wires between the climate control unit and the sunlight sensor. NO - Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit.

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1. Clear the DTC by turning the ignition switch OFF, and then ON (II).
2. Operate the climate control system in several modes.
3. Check for DTCs using the self-diagnostic or HDS. Is DTC B1231 or G indicated? YES - Go to step 4 . NO - Intermittent failure, check for loose wires or poor connections on the evaporator temperature sensor circuit.
4. Turn the ignition switch OFF.
5. Remove the evaporator temperature sensor (see «EVAPORATOR TEMPERATURE SENSOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system) ) and test it (see «EVAPORATOR TEMPERATURE SENSOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system) ). Does the evaporator temperature sensor test OK? YES - Go to step 6 . NO - Replace the evaporator temperature sensor.
6. Disconnect climate control unit connector A (20P).
7. Check for continuity between the No. 18 terminal of climate control unit connector A (20P) and the No. 1 terminal of the evaporator temperature sensor 2P connector. Is there continuity? YES - Go to step 8 . NO - Repair open in the wire between the climate control unit and the evaporator temperature sensor.
8. Check for continuity between the No. 5 terminal of climate control unit connector A (20P) and the No. 2 terminal of the evaporator temperature sensor 2P connector. Is there continuity? YES - Check for loose wire or poor connections at climate control unit connector A (20P) and at the evaporator temperature sensor 2P connector. If the connections are good, substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit. NO - Repair open in the wire between the climate control unit and the evaporator temperature sensor.

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1. Clear the DTC by turning the ignition switch OFF, and then ON (II).
2. Operate the climate control system in several modes.
3. Check for DTCs using the self-diagnostic or HDS. Is DTC B1232 or H indicated? YES - Go to step 4 . NO - Intermittent failure.
4. Turn the ignition switch OFF.
5. Remove the evaporator temperature sensor (see «EVAPORATOR TEMPERATURE SENSOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system) ) and test it (see «EVAPORATOR TEMPERATURE SENSOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system) ). Does the evaporator temperature sensor test OK? YES - Go to step 6 . NO - Replace the evaporator temperature sensor.
6. Disconnect climate control unit connector A (20P).
7. Check for continuity between the No. 18 terminal of climate control unit connector A (20P) and body ground. Is there continuity? YES - Repair short to body ground in the wire between the climate control unit and the evaporator temperature sensor. NO - Go to step 8 .
8. Check for continuity between the No. 18 terminal and the No. 5 terminal of climate control unit connector A (20P). Is there continuity? YES - Repair short to in the wires between the climate control unit and the evaporator temperature sensor. NO - Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit.

Scheme 40

1. Clear the DTC by turning the ignition switch OFF, and then ON (II).
2. Operate the climate control system in several modes.
3. Check for DTCs using the self-diagnostic or HDS. Is DTC B1233 or I indicated? YES - Go to step 4 . NO - Intermittent failure, check for loose wires or poor connections on the driver's air mix control motor circuit.
4. Turn the ignition switch OFF.
5. Test the driver's air mix control motor (see «DRIVER'S AIR MIX CONTROL MOTOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__drivers-air-mix-control-motor-test) ). Is the driver's air mix control motor OK? YES - Go to step 6 . NO - Replace the driver's air mix control motor.
6. Disconnect the driver's air mix control motor 5P connector.
7. Disconnect climate control unit connector A (20P) and B (16P).
8. Check for continuity between the following terminals of climate control unit connector A (20P) and B (16P) and the driver's air mix control motor 5P connector. TERMINAL SPECIFICATION 20P: 5P: No. 5 No. 5 No. 10 No. 3 No. 20 No. 4 16P: 5P: No. 3 No. 1 No. 4 No. 2 Is there continuity? YES - Check for loose wire or poor connections at climate control unit connector A (20P) and B (16P) and at the driver's air mix control motor 5P connector. If the connections are good, substitute a known-good climate control unit and recheck. If the symptom/indication goes away, replace the original climate control unit. NO - Repair any open in the wire(s) between the climate control unit and the driver's air mix control motor.

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1. Clear the DTC by turning the ignition switch OFF, and then ON (II).
2. Operate the climate control system in several modes.
3. Check for DTCs using the self-diagnostic or HDS. Is DTC B1234 or J indicated? YES - Go to step 4 . NO - Intermittent failure.
4. Turn the ignition switch OFF.
5. Test the driver's air mix control motor (see «DRIVER'S AIR MIX CONTROL MOTOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__drivers-air-mix-control-motor-test) ). Is the driver's air mix control motor OK? YES - Go to step 6 . NO - Replace the driver's air mix control motor (see «DRIVER'S AIR MIX CONTROL MOTOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__drivers-air-mix-control-motor-test) ).
6. Disconnect the driver's air mix control motor 5P connector.
7. Disconnect climate control unit connector A (20P) and B (16P).
8. Check for continuity between body ground and climate control unit connector A (20P) terminals No. 5, 10 and 20 individually, and between body ground and climate control unit connector B (16P) terminals No. 3 and 4 individually. Is there continuity? YES - Repair any short to body ground in the wire(s) between the climate control unit and the driver's air mix control motor. NO - Go to step 9 .
9. Check for continuity between the terminals of climate control unit connector A (20P) and B (16P) as follows. TERMINAL SPECIFICATION Terminal To terminals A5 A10, A20, B3, B4 A10 A20, B3, B4 A20 B3, B4 B3 B4 Is there continuity between any of the terminals? YES - Repair the short in the wires. NO - Go to step 10 .
10. Turn the ignition switch ON (II), and check the same terminals for voltage. Is there any voltage? YES - Repair any short to power in the wire(s) between the climate control unit and the driver's air mix control motor. This short may also damages the climate control unit. Repair the short to power before replacing the climate control unit. NO - Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit.

DTC B1235 or DTC indicator K: A Problem in the Driver's Air Mix Control Linkage, Door or Motor

1. Clear the DTC by turning the ignition switch OFF, and then ON (II).
2. Operate the climate control system in several modes.
3. Check for DTCs using the self-diagnostic or HDS. Is DTC B1235 or K indicated? YES - Go to step 4 . NO - Intermittent failure.
4. Turn the ignition switch OFF.
5. Test the driver's air mix control motor (see «DRIVER'S AIR MIX CONTROL MOTOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__drivers-air-mix-control-motor-test) ). Is the driver's air mix control motor OK? YES - Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit. NO - Replace the driver's air mix control motor (see «DRIVER'S AIR MIX CONTROL MOTOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__drivers-air-mix-control-motor-test) ), or repair the driver's air mix control linkage or door.

Scheme 45

1. Clear the DTC by turning the ignition switch OFF, and then ON (II).
2. Operate the climate control system in several modes.
3. Check for DTCs using the self-diagnostic or HDS. Is DTC B1236 or L indicated? YES - Go to step 4 . NO - Intermittent failure, check for loose wires or poor connections on the passenger's air mix control motor circuit.
4. Turn the ignition switch OFF.
5. Test the passenger's air mix control motor (see «PASSENGER'S AIR MIX CONTROL MOTOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__passengers-air-mix-control-motor-test) ). Is the passenger's air mix control motor OK? YES - Go to step 6 . NO - Replace the passenger's air mix control motor (see «PASSENGER'S AIR MIX CONTROL MOTOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__passengers-air-mix-control-motor-test) ).
6. Disconnect the passenger's air mix control motor 5P connector.
7. Disconnect climate control unit connector A (20P) and B (16P).
8. Check for continuity between the following terminals of climate control unit connector A (20P) and B (16P) and the passenger's air mix control motor 5P connector. DIAGNOSTIC TABLE 20P: 5P: No. 5 No. 5 No. 20 No. 4 16P: 5P: No. 7 No. 1 No. 8 No. 2 No. 16 No. 3 Is there continuity? YES - Check for loose wire or poor connections at climate control unit connector A (20P) and B (16P) and at the passenger's air mix control motor 5P connector. If the connections are good, substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit. NO - Repair any open in the wire(s) between the climate control unit and the passenger's air mix control motor.

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Scheme 49

1. Clear the DTC by turning the ignition switch OFF, and then ON (II).
2. Operate the climate control system in several modes.
3. Check for DTCs using the self-diagnostic or HDS. Is DTC B1237 or M indicated? YES - Go to step 4 . NO - Intermittent failure.
4. Turn the ignition switch OFF.
5. Test the passenger's air mix control motor (see «PASSENGER'S AIR MIX CONTROL MOTOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__passengers-air-mix-control-motor-test) ). Is the passenger's air mix control motor OK? YES - Go to step 6 . NO - Replace the passenger's air mix control motor (see «PASSENGER'S AIR MIX CONTROL MOTOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__passengers-air-mix-control-motor-test) ).
6. Disconnect the passenger's air mix control motor 5P connector.
7. Disconnect climate control unit connector A (20P) and B (16P).
8. Check for continuity between body ground and climate control unit connector A (20P) terminals No. 5 and 20 individually, and between body ground and climate control unit connector B (16P) terminals No. 7, 8 and 16 individually. Is there continuity? YES - Repair any short to body ground in the wire(s) between the climate control unit and the passenger's air mix control motor. NO - Go to step 9 .
9. Check for continuity between the terminals of climate control unit connector A (20P) and B (16P) as follows. SHORT TO BODY GROUND WIRE Terminal To terminals A5 A20, B7, B8, B16 A20 B7, B8, B16 B7 B8, B16 B8 B16 Is there continuity between any of the terminals? YES - Repair the short in the wires. NO - Go to step 10 .
10. Turn the ignition switch ON (II), and check the same terminals for voltage. Is there any voltage? YES - Repair any short to power in the wire(s) between the climate control unit and the passenger's air mix control motor. This short may also damage the climate control unit. Repair the short to power before replacing the climate control unit. NO - Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit.

DTC B1238 or DTC indicator N: A Problem in the Passenger's Air Mix Control Linkage, Door, or Motor

1. Clear the DTC by turning the ignition switch OFF, and then ON (II).
2. Operate the climate control system in several modes.
3. Check for DTCs using the self-diagnostic or HDS. Is DTC B1238 or N indicated? YES - Go to step 4 . NO - Intermittent failure.
4. Turn the ignition switch OFF.
5. Test the passenger's air mix control motor (see «PASSENGER'S AIR MIX CONTROL MOTOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__passengers-air-mix-control-motor-test) ). Is the passenger's air mix control motor OK? YES - Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit. NO - Replace the passenger's air mix control motor, or repair the passenger's air mix control linkage or door.

Scheme 50

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Scheme 54

1. Clear the DTC by turning the ignition switch OFF, and then ON (II).
2. Operate the climate control system in several modes.
3. Check for DTCs using the self-diagnostic or HDS. Is DTC B1239 or O indicated? YES - Go to step 4 . NO - Intermittent failure, check for loose wires or poor connections on the driver's mode control motor circuit.
4. Turn the ignition switch OFF.
5. Test the driver's mode control motor (see «DRIVER'S MODE CONTROL MOTOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__drivers-mode-control-motor-test) ). Is the driver's mode control motor OK? YES - Go to step 6 . NO - Replace the driver's mode control motor (see «DRIVER'S MODE CONTROL MOTOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__drivers-mode-control-motor-test) ).
6. Disconnect the driver's mode control motor 10P connector.
7. Disconnect climate control unit connector A (20P) and B (16P).
8. Check for continuity between the following terminals of climate control unit connector A (20P) and B (16P) and the driver's mode control motor 10P connector. TERMINAL SPECIFICATION 20P: 10P: No. 5 No. 10 16P: 10P: No. 1 No. 2 No. 2 No. 1 No. 9 No. 9 No. 10 No. 8 No. 11 No. 6 No. 12 No. 7 Is there continuity? YES - Go to step 9 . NO - Repair any open in the wire(s) between the climate control unit and the driver's mode control motor.
9. Check for continuity between body ground and climate control unit connector A (20P) terminal No. 5, and between body ground and climate control unit connector B (16P) terminals No. 1, 2, 9, 10, 11 and 12 individually. Is there continuity? YES - Repair any short to body ground in the wire(s) between the climate control unit and the driver's mode control motor. NO - Go to step 10 .
10. Check for continuity between the terminals of climate control unit connector A (20P) and B (16P) as follows. TERMINAL SPECIFICATION Terminal To terminals A5 B1, B2, B9, B10, B11, B12 B1 B2, B9, B10, B11, B12 B2 B9, B10, B11, B12 B9 B10, B11, B12 B10 B11, B12 B11 B12 Is there continuity between any of the terminals? YES - Repair the short in the wires. NO - Go to step 11 .
11. Turn the ignition switch ON (II), and check the same terminals for voltage. Is there any voltage? YES - Repair any short to power in the wire(s) between the climate control unit and the driver's mode control motor. This short may also damage the climate control unit. Repair the short to power before replacing the climate control unit. NO - Check for loose wire or poor connections at climate control unit connector A (20P) and B (16P) and at the driver's mode control motor 10P connector. If the connections are good, substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit.

DTC B1240 or DTC Indicator P: A Problem in the Driver's Mode Control Linkage, Doors, or Motor

1. Clear the DTC by turning the ignition switch OFF, and then ON (II).
2. Operate the climate control system in several modes.
3. Check for DTCs using the self-diagnostic or HDS. Is DTC B1240 or P indicated? YES - Go to step 4 . NO - Intermittent failure.
4. Turn the ignition switch OFF.
5. Test the driver's mode control motor (see «DRIVER'S MODE CONTROL MOTOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__drivers-mode-control-motor-test) ). Is the driver's mode control motor OK? YES - Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit. NO - Replace the driver's mode control motor (see «DRIVER'S MODE CONTROL MOTOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__drivers-mode-control-motor-test) ), or repair the driver's mode control linkage or doors.

Scheme 55

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Scheme 59

1. Clear the DTC by turning the ignition switch OFF, and then ON (II).
2. Operate the climate control system in several modes.
3. Check for DTCs using the self-diagnostic or HDS. Is DTC B1242 or Q indicated? YES - Go to step 4 . NO - Intermittent failure, check for loose wires or poor connections on the passenger's mode control motor circuit.
4. Turn the ignition switch OFF.
5. Test the passenger's mode control motor (see «PASSENGER'S MODE CONTROL MOTOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__passengers-mode-control-motor-test) ). Is the passenger's mode control motor OK? YES - Go to step 6 . NO - Replace the passenger's mode control motor (see «PASSENGER'S MODE CONTROL MOTOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__passengers-mode-control-motor-test) ).
6. Disconnect the passenger's mode control motor 10P connector.
7. Disconnect climate control unit connector A (20P) and B (16P).
8. Check for continuity between the following terminals of climate control unit connector A (20P) and B (16P) and the passenger's mode control motor 10P connector. TERMINAL SPECIFICATION 20P: 10P: No. 5 No. 10 16P: 10P: No. 5 No. 2 No. 6 No. 1 No. 13 No. 8, 9 No. 14 No. 7 No. 15 No. 6 Is there continuity? YES - Go to step 9 . NO - Repair any open in the wire(s) between the climate control unit and the passenger's mode control motor.
9. Check for continuity between body ground and climate control unit connector A (20P) terminal No. 5, and between body ground and climate control unit connector B (16P) terminals No. 5, 6, 13, 14 and 15 individually. Is there continuity? YES - Repair any short to body ground in the wire(s) between the climate control unit and the passenger's mode control motor. NO - Go to step 10 .
10. Check for continuity between the terminals of climate control unit connector A (20P) and B (16P) as follows. TERMINAL SPECIFICATION Terminal To terminals A5 B5, B6, B13, B14, B15 B5 B6, B13, B14, B15 B6 B13, B14, B15 B13 B14, B15 B14 B15 Is there continuity between any of the terminals? YES - Repair the short in the wires. NO - Go to step 11 .
11. Turn the ignition switch ON (II), and check the same terminals for voltage. Is there any voltage? YES - Repair any short to power in the wire(s) between the climate control unit and the passenger's mode control motor. This short may also damage the climate control unit. Repair the short to power before replacing the climate control unit. NO - Check for loose wire or poor connections at climate control unit connector A (20P) and B (16P) and at the passenger's mode control motor 10P connector. If the connections are good, substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit.

DTC B1243 or DTC indicator R: A Problem in the Passenger's Mode Control Linkage, Doors, or Motor

1. Clear the DTC by turning the ignition switch OFF, and then ON (II).
2. Operate the climate control system in several modes.
3. Check for DTCs using the self-diagnostic or HDS. Is DTC B1243 or R indicated? YES - Go to step 4 . NO - Intermittent failure.
4. Turn the ignition switch OFF.
5. Test the passenger's mode control motor (see «PASSENGER'S MODE CONTROL MOTOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__passengers-mode-control-motor-test) ). Is the passenger's mode control motor OK? YES - Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit. NO - Replace the passenger's mode control motor (see «PASSENGER'S MODE CONTROL MOTOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__passengers-mode-control-motor-test) ), or repair the passenger's mode control linkage or doors.

Scheme 60

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Scheme 69

1. Clear the DTC by turning the ignition switch OFF, and then ON (II).
2. Operate the climate control system in several modes.
3. Check for DTCs using the self-diagnostic or HDS. Is DTC B1241 or S indicated? YES - Go to step 4 . NO - Intermittent failure, check for loose wires or poor connections on the blower motor circuit.
4. Turn the ignition switch OFF.
5. Check the No. 21 (40A) fuse in the under-hood fuse/relay box, and the No. 30 (7.5A) fuse in the under-dash fuse/relay box. Are the fuses OK? YES - Go to step 6 . NO - Replace the fuse(s), and recheck.
6. Connect the No. 1 terminal of the blower motor 2P connector to body ground with a jumper wire.
7. Turn the ignition switch ON (II). Does the blower motor run? YES - Go to step 8 . NO - Go to step 23 .
8. Turn the ignition switch OFF.
9. Disconnect the jumper wire.
10. Disconnect the power transistor 4P connector.
11. Check for continuity between the No. 3 terminal of the power transistor 4P connector and body ground. Is there continuity? YES - Go to step 12 . NO - Check for an open in the wire between the power transistor and body ground. If the wire is OK, check for poor ground at G506.
12. Connect the No. 1 and No. 3 terminals of the power transistor 4P connector with a jumper wire.
13. Turn the ignition switch ON (II). Does the blower motor run at high speed? YES - Go to step 14 . NO - Repair open in the BLU/BLK wire between the power transistor and the blower motor.
14. Turn the ignition switch OFF.
15. Disconnect the jumper wire.
16. Disconnect climate control unit connector A (20P).
17. Check for continuity between the No. 7 and No. 8 terminals of climate control unit connector A (20P) and body ground individually. Is there continuity? YES - Repair any short to body ground in the wire(s) between the climate control unit and the power transistor. NO - Go to step 18 .
18. Check for continuity between the following terminals of climate control unit connector A (20P) and power transistor 4P connector. TERMINAL SPECIFICATION 20P: 4P: No. 7 No. 2 No. 8 No. 4 Is there continuity? YES - Go to step 19 . NO - Repair any open in the wire(s) between the climate control unit and the power transistor.
19. Start the engine.
20. Measure the voltage between the No. 7 and No. 8 terminals of climate control unit connector A (20P) and body ground individually. Is there 1 V or more? YES - Repair short to power in the wires. NO - Go to step 21 .
21. Reconnect climate control unit connector A (20P).
22. Test the power transistor (see «POWER TRANSISTOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system) ). Is the power transistor OK? YES - Check for loose wire or poor connections at climate control unit connector A (20P) and at the power transistor 4P connector. If the connections are good, substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit. NO - Replace the power transistor.
23. Disconnect the jumper wire.
24. Disconnect the blower motor 2P connector.
25. Measure the voltage between the No. 2 terminal of the blower motor 2P connector and body ground. Is there battery voltage? YES - Replace the blower motor. NO - Go to step 26 .
26. Turn the ignition switch OFF.
27. Remove the blower motor relay from the under-hood fuse/relay box, and test it (see «POWER RELAY TEST»(/acura/tl/iii-2003-2006/remont/body-electrical/#relays__power-relay-test) ). Is the relay OK? YES - Go to step 28 . NO - Replace the blower motor relay.
28. Measure the voltage between the No. 2 terminal of the blower motor relay 4P socket and body ground. Is there battery voltage? YES - Go to step 29 . NO - Replace the under-hood fuse/relay box.
29. Turn the ignition switch ON (II).
30. Measure the voltage between the No. 4 terminal of the blower motor relay 4P socket and body ground. Is there battery voltage? YES - Go to step 31 . NO - Repair open in the BLK/YEL wire between the No. 30 (7.5 A) fuse in the under-dash fuse/relay box and the blower motor relay.
31. Turn the ignition switch OFF.
32. Check for continuity between the No. 3 terminal of the blower motor relay 4P socket and body ground. Is there continuity? YES - Repair open in the WHT/BLU wire between the blower motor relay and the blower motor. NO - Check for an open in the BLK wire between the blower motor relay and body ground. If the wire is OK, check for poor ground at G302.

Scheme 70

Scheme 71

1. Clear the DTC by turning the ignition switch OFF, and then ON (II).
2. Operate the climate control system in several modes.
3. Check for DTCs using the self-diagnostic or HDS. Is DTC B1726 indicated? YES - Go to step 4 . NO - Intermittent failure.
4. Turn the ignition switch OFF.
5. Disconnect the display panel control unit connector B (6P).
6. Disconnect the climate control unit connector A (20P).
7. Check for continuity between the following terminals of display panel control unit connector B (6P) and climate control unit connector A (20P). TERMINAL SPECIFICATION 6P: 20P: No. 1 No. 4 No. 2 No. 13 No. 3 No. 2 No. 4 No. 12 No. 5 No. 11 Is there continuity? YES - Go to step 8 . NO - Repair any open in the wires between the display panel control unit and the climate control unit connector.
8. Disconnect the driver's and passenger's air mix control motor connectors (5P).
9. Check for continuity between the No. 20 terminal of climate control unit connector A (20P) and body ground. Is there continuity? YES - Repair short to body ground in the wire between the climate control unit and the driver's and passenger's air mix control motors. NO - Check for loose wires or poor connections at display panel control unit connector B (6P) and at climate control unit connector A (20P). If the connections are good, substitute a known-good display panel control unit and/or climate control unit, and recheck. If the symptom/indication goes away, replace the original display panel control unit and/or climate control unit.

DTC B1202: Climate Control Unit Internal Error

Note. Check the battery condition (see BATTERY TEST ) and the charging system (see CHARGING SYSTEM INDICATOR CIRCUIT TROUBLESHOOTING ). If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN system diagnosis test mode A (see TROUBLESHOOTING -- B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

1. Clear the DTCs using the HDS.
2. Turn the ignition switch OFF then ON.
3. Turn the climate control system on and operate several functions (A/C on/off, air mix and blend door operations, temperature settings etc.).
4. Check the DTCs by selecting the DTC MENU (DTCs) from the HDS. Is DTC B1202 indicated? YES - The climate control unit is faulty, replace the climate control unit. NO - Intermittent failure, the climate control unit is OK at this time. Check for loose or poor connections at climate control unit connector A (20P) and B (16P).

Scheme 72

Scheme 73

Scheme 74

Scheme 75

1. Check the No. 30 (7.5 A) fuse in the under-dash fuse/relay box. Is the fuse OK? YES - Go to step 2 . NO - Replace the fuse, and recheck.
2. Disconnect the recirculation control motor 5P connector.
3. Turn the ignition switch ON (II).
4. Measure the voltage between the No. 5 terminal of the recirculation control motor 5P connector and body ground. Is there battery voltage? YES - Go to step 5 . NO - Repair open in the wire between the No. 30 (7.5 A) fuse in the under-dash fuse/relay box and the recirculation control motor.
5. Turn the ignition switch OFF.
6. (see «RECIRCULATION CONTROL MOTOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__recirculation-control-motor-test) ). Is the recirculation control motor OK? YES - Go to step 7 . NO - Replace the recirculation control motor (see «RECIRCULATION CONTROL MOTOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__recirculation-control-motor-test) ), or repair the recirculation control linkage or doors.
7. Disconnect climate control unit connector A (20P).
8. Check for continuity between the No. 9 and No. 19 terminals of climate control unit connector A (20P) and body ground individually. Is there continuity? YES - Repair any short to body ground in the wire(s) between the climate control unit and the recirculation control motor. NO - Go to step 9 .
9. Turn the ignition switch ON (II), and check the same wires for voltage. Is there any voltage? YES - Repair any short to power in the wire(s) between the climate control unit and the recirculation control motor. This short may also damage the climate control unit. Repair the short to power before replacing the climate control unit. NO - Go to step 10 .
10. Turn the ignition switch OFF.
11. Check for continuity between the following terminals of climate control unit connector A (20P) and the recirculation control motor 5P connector. CONNECTOR SPECIFICATION 20P: 5P: No. 9 No. 1 No. 19 No. 2 Is there continuity? YES - Check for loose wires or poor connections at climate control unit connector A (20P) and at the recirculation control motor 5P connector. If the connections are good, substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit. NO - Repair any open in the wire(s) between the climate control unit and the recirculation control motor.

Scheme 76

Scheme 77

Scheme 78

1. Check the No. 30 (7.5 A) fuse in the under-dash fuse/relay box. Is the fuse OK? YES - Go to step 2 . NO - Replace the fuse, and recheck.
2. Disconnect climate control unit connector A (20P).
3. Turn the ignition switch ON (II).
4. Measure the voltage between the No. 1 terminal of climate control unit connector A (20P) and body ground. Is there battery voltage? YES - Go to step 5 . NO - Repair open in the wire between the No. 30 (7.5 A) fuse in the under-dash fuse/relay box and the climate control unit.
5. Turn the ignition switch OFF.
6. Check for continuity between the No. 3 (Canada) or No. 6 (USA) terminal of climate control unit connector A (20P) and body ground. Canada USA Is there continuity? YES - Check for loose wires or poor connections at climate control unit connector A (20P). If the connections are good, substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit. NO - Check for an open in the wires between the climate control unit and body ground. If the wire is OK, check for poor ground at G503 and/or G601.

Radiator and A/C Condenser Fan Low Speed Circuit Troubleshooting

Note. Do not use this troubleshooting procedure if the A/C compressor is inoperative. Refer to the SYMPTOM TROUBLESHOOTING INDEX . Before performing symptom troubleshooting, check for powertrain DTCs (see GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 79

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Scheme 91

1. Check the No. 9 (30 A) fuse in the under-hood fuse/relay box, and the No. 30 (7.5 A) fuse in the under-dash fuse/relay box. Are the fuses OK? YES - Go to step 2 . NO - Replace the fuse(s), and recheck.
2. Remove the A/C condenser fan relay from the under-hood fuse/relay box, and test it (see «POWER RELAY TEST»(/acura/tl/iii-2003-2006/remont/body-electrical/#relays__power-relay-test) ). Is the relay OK? YES - Go to step 3 . NO - Replace the A/C condenser fan relay.
3. Measure the voltage between the No. 1 terminal of the A/C condenser fan relay 4P socket and body ground. Is there battery voltage? YES - Go to step 4 . NO - Replace the under-hood fuse/relay box.
4. Connect the No. 1 and No. 2 terminals of the A/C condenser fan relay 4P socket with a jumper wire. Does the A/C condenser fan run? YES - Go to step 5 . NO - Go to step 13 .
5. Disconnect the jumper wire.
6. Turn the ignition switch ON (II).
7. Measure the voltage between the No. 3 terminal of the A/C condenser fan relay 4P socket and body ground. Is there battery voltage? YES - Go to step 8 . NO - Go to step 33 .
8. Turn the ignition switch OFF.
9. Reinstall the A/C condenser fan relay.
10. Make sure the A/C switch is OFF.
11. Turn the ignition switch ON (II).
12. Using the backprobe set, measure the voltage between the No. 6 terminal of ECM/PCM connector A (31P) ('04-05 models), or No. 6 terminal of ECM/PCM connector E (31P) ('06 model) and body ground with the ECM/PCM connectors connected. '04-05 models '06 model Is there battery voltage? YES - Check for loose wires or poor connections at No. 6 terminal of the ECM/PCM connector A (31P) ('04-05 models), or No. 6 terminal of ECM/PCM connector E (31P) ('06 model). If the connections are good, substitute a known-good ECM/PCM, and recheck. If the symptom/indication goes away, replace the original ECM/PCM, then perform the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ). NO - Repair open in the wire between the A/C condenser fan relay and the ECM/PCM.
13. Disconnect the jumper wire.
14. Reinstall the A/C condenser fan relay.
15. Disconnect the A/C condenser fan 2P connector.
16. Turn the ignition switch ON (II), then turn the A/C and blower fan switches ON.
17. Measure the voltage between the No. 2 terminal of the A/C condenser fan 2P connector and body ground. Is there battery voltage? YES - Go to step 18 . NO - Repair open in the wire between the A/C condenser fan relay and the A/C condenser fan.
18. Turn the A/C and fan switches OFF, then turn the ignition switch OFF.
19. Reconnect the A/C condenser fan 2P connector.
20. Connect the No. 1 terminal of the A/C condenser fan 2P connector to body ground with a jumper wire.
21. Turn the ignition switch ON (II), then turn the A/C and fan switches ON. Does the A/C condenser fan run? YES - Go to step 22 . NO - Replace the A/C condenser fan motor.
22. Turn the A/C and fan switches OFF, then turn the ignition switch OFF.
23. Disconnect the jumper wire.
24. Remove the fan control relay from the multi-relay box, and test it (see «POWER RELAY TEST»(/acura/tl/iii-2003-2006/remont/body-electrical/#relays__power-relay-test) ). Is the relay OK? YES - Go to step 25 . NO - Replace the fan control relay.
25. Turn the ignition switch ON (II), then turn the A/C and fan switches ON.
26. Measure the voltage between the No. 1 terminal of the fan control relay 5P socket and body ground. Is there battery voltage? YES - Go to step 27 . NO - Repair open in the wire between the A/C condenser fan and the fan control relay.
27. Turn the A/C and fan switches OFF, then turn the ignition switch OFF.
28. Remove the radiator fan relay from the under-hood fuse/relay box.
29. Check for continuity between the No. 4 terminal of the fan control relay 5P socket and the No. 1 terminal of the radiator fan relay 4P socket. Is there continuity? YES - Go to step 30 . NO - Repair open in the wire between the fan control relay and the radiator fan relay.
30. Disconnect the radiator fan 2P connector.
31. Check for continuity between the No. 1 terminal of the radiator fan relay 4P socket and the No. 2 terminal of the radiator fan 2P connector. Is there continuity? YES - Go to step 32 . NO - Repair open in the wire between the radiator fan relay and the radiator fan.
32. Check for continuity between the No. 1 terminal of the radiator fan 2P connector and body ground. Is there continuity? YES - Replace the radiator fan motor. NO - Check for an open in the wire between the radiator fan and body ground. If the wire is OK, check for poor ground at G301.
33. Turn the ignition switch OFF.
34. Remove A/C diode A from the under-hood fuse/relay box.
35. Using the diode setting on a DVOM, check for current flow in both directions between the No. 1 and No. 2 terminals of A/C diode A. Is there current flow In only one direction? YES - Go to step 36 . NO - Replace A/C diode A.
36. Turn the ignition switch ON (II).
37. Measure the voltage between the No. 2 terminal of A/C diode A 2P socket and body ground. Is there battery voltage? YES - Replace the under-hood fuse/relay box. NO - Repair open in the wire between the No. 30 (7.5 A) fuse in the under-dash fuse/relay box and A/C diode A pin 2.

A/C Condenser Fan High Speed Circuit Troubleshooting

Note. Do not use this troubleshooting procedure if the radiator fan and/or the A/C compressor is inoperative. Refer to the SYMPTOM TROUBLESHOOTING INDEX . Before performing symptom troubleshooting, check for powertrain DTCs (see GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 92

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Scheme 96

1. Check the No. 30 (7.5 A) fuse in the under-dash fuse/relay box. Is the fuse OK? YES - Go to step 2 . NO - Replace the fuse, and recheck.
2. Remove the fan control relay from the multi-relay box, and test it (see «POWER RELAY TEST»(/acura/tl/iii-2003-2006/remont/body-electrical/#relays__power-relay-test) ). Is the relay OK? YES - Go to step 3 . NO - Replace the fan control relay.
3. Turn the ignition switch ON (II).
4. Measure the voltage between the No. 5 terminal of the fan control relay 5P socket and body ground. Is there battery voltage? YES - Go to step 5 . NO - Go to step 9 .
5. Turn the ignition switch OFF.
6. Check for continuity between the No. 2 terminal of the fan control relay 5P socket and body ground. Is there continuity? YES - Go to step 7 . NO - Check for an open in the wire between the fan control relay and body ground. If the wire is OK, check for poor ground at G301.
7. Remove the radiator fan relay from the under-hood fuse/relay box.
8. Check for continuity between the No. 3 terminal of the fan control relay 5P socket and the No. 4 terminal of the radiator fan relay 4P socket. Is there continuity? YES - Repair open in the wire between the radiator fan relay terminal No. 4 and the ECM/PCM terminal A7. NO - Repair open in the wire between the fan control relay and the radiator fan relay.
9. Turn the ignition switch OFF.
10. Remove A/C diode A from under-hood fuse/relay box.
11. Using the diode setting on a DVOM, check for current flow in both directions between the No. 1 and No. 2 terminals of A/C diode A. Is there current flow in only one direction? YES - Go to step 12 . NO - Replace A/C diode A.
12. Turn the ignition switch ON (II).
13. Measure the voltage between the No. 2 terminal of A/C diode A 2P socket and body ground. Is there battery voltage? YES - Repair open in the BLU/YEL wire between A/C diode A and the fan control relay. NO - Repair open in the wire between the No. 30 (7.5 A) fuse in the under-dash fuse/relay box and A/C diode A.

Radiator and A/C Condenser Fan High Speed Circuit Troubleshooting

Note. Do not use this troubleshooting procedure if only one fan is inoperative, or if the A/C compressor is inoperative. Refer to the SYMPTOM TROUBLESHOOTING INDEX . Before performing symptom troubleshooting, check for powertrain DTCs (see GENERAL TROUBLESHOOTING INFORMATION ). The normal operating A/C pressure for the radiator and A/C condenser fans to run at high speed is 1,470 kPa (15.0 kgf/cm 2 , 213 psi).

Scheme 97

Scheme 98

Scheme 99

Scheme 100

1. Disconnect the A/C pressure switch 4P connector.
2. Check for continuity between the No. 2 terminals of the A/C pressure switch 4P connector and body ground. Is there continuity? YES - Go to step 3 . NO - Check for an open in the wire between the A/C pressure switch and body ground. If the wire is OK, check for poor ground at G201.
3. Check for continuity between the No. 14 terminal of the ECM/PCM connector E (31P) ('04-05 models), or No. 14 terminal of ECM/PCM connector D (17P) ('06 model) and the No. 3 terminal of the A/C pressure switch 4P connector. '04-05 models '06 model Is there continuity? YES - Go to step 4 . NO - Repair open in the wire between the ECM/ PCM and the A/C pressure switch.
4. Turn the ignition switch ON (II).
5. Turn the A/C and blower fan switches on.
6. Connect the No. 2 and No. 3 terminals of the A/C pressure switch 4P connector with a jumper wire. Does the radiator and A/C condenser fans run at high speed? YES - Replace the A/C pressure switch. NO - Check for loose wires or poor connections at ECM/PCM connector E (31P) ('04-05 models), or ECM/PCM connector D (17P) ('06 model) and at the A/C pressure switch 4P connector. If the connections are good, substitute a known-good ECM/PCM, and recheck. If the symptom/indication goes away, replace the original ECM/PCM, then perform the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .

A/C Compressor Clutch Circuit Troubleshooting

Note. It is normal for the A/C compressor to turn off under certain conditions, such as low idel, high engine coolant temperature, or hard acceleration. Do not use this troubleshooting procedure if the fans are also inoperative with the A/C on. Refer to the SYMPTOM TROUBLESHOOTING INDEX . Before performing symptom troubleshooting, check for powertrain DTCs (see GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 101

Scheme 102

Scheme 103

Scheme 104

Scheme 105

Scheme 106

1. Check the No. 12 (7.5 A) fuse in the under-hood fuse/relay box, and the No. 30 (7.5 A) fuse in the under-dash fuse/relay box. Are the fuses OK? YES - Go to step 2 . NO - Replace the fuse(s), and recheck.
2. Check the engine coolant temperature, and idle speed (use the HDS PGM-FI data list if possible). CONNECTOR SPECIFICATION ECT Sensor 169-194°F (76-90°C) TP Sensor About 0.5 V RPM More than 790 Is the engine coolant temperature, throttle position, and idle speed OK? YES - Go to step 3 . NO - Troubleshoot and repair the cause of the high engine coolant temperature, or low idle.
3. Remove the A/C compressor clutch relay from the under-hood fuse/relay box, and test it (see «POWER RELAY TEST»(/acura/tl/iii-2003-2006/remont/body-electrical/#relays__power-relay-test) ). Is the relay OK? YES - Go to step 4 . NO - Replace the A/C compressor clutch relay.
4. Measure the voltage between the No. 1 terminal of the A/C compressor clutch relay 4P socket and body ground. Is there battery voltage? YES - Go to step 5 . NO - Replace the under-hood fuse/relay box.
5. Connect the No. 1 and No. 2 terminals of the A/C compressor clutch relay 4P socket with a jumper wire. Does the A/C compressor clutch click? YES - Go to step 6 . NO - Go to step 14
6. Disconnect the jumper wire.
7. Turn the ignition switch ON (II).
8. Measure the voltage between the No. 4 terminal of the A/C compressor clutch relay 4P socket and body ground. Is there battery voltage? YES - Go to step 9 . NO - Repair open in the BLK/YEL wire between the No. 30 (7.5 A) fuse in the under-dash fuse/relay box and the A/C compressor clutch relay.
9. Turn the ignition switch OFF.
10. Reinstall the A/C compressor clutch relay.
11. Make sure the A/C switch is OFF.
12. Turn the ignition switch ON (II).
13. Measure the voltage between the No. 27 terminal of ECM/PCM connector A (31P) ('04-05 models), or No. 27 terminal of ECM/PCM connector E (31P) ('06 model) and body ground with the ECM/PCM connectors connected. '04-05 models '06 model Is there battery voltage? YES - Check for loose wires or poor connections at ECM/PCM connector A (31P) ('04-05 models), or No. 27 terminal of ECM/PCM connector E (31P) ('06 model). If the connections are good, check the ECM/PCM grounds. If the grounds are good, substitute a known-good ECM/PCM, and recheck. If the symptom/indication goes away, replace the original ECM/PCM then perform the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) . NO - Repair open in the wire between the A/C compressor clutch relay and the ECM/PCM.
14. Disconnect the jumper wire.
15. Disconnect the A/C compressor clutch 1P connector.
16. Check for continuity between the No. 2 terminal of the A/C compressor clutch relay 4P socket and the No. 1 terminal of the A/C compressor clutch 1P connector. Is there continuity? YES - Check the A/C compressor clutch clearance, and the A/C compressor clutch field coil (see «A/C COMPRESSOR CLUTCH CHECK»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system) ). Repair as needed. NO - Repair open in the wire between the A/C compressor clutch relay and the A/C compressor clutch.

A/C Pressure Switch Circuit Troubleshooting

Note. Do not use this troubleshooting procedure if any of the following items are operative; A/C condenser fan, radiator fan, A/C compressor. Refer to the SYMPTOM TROUBLESHOOTING INDEX . Before performing symptom troubleshooting, check for power train DTCs (see GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 107

Scheme 108

Scheme 109

Scheme 110

1. Check for body DTCs using B-CAN system diagnosis test mode A troubleshooting (see «TROUBLESHOOTING -- B-CAN SYSTEM DIAGNOSIS TEST MODE A»(/acura/tl/iii-2003-2006/remont/communication-devices/#multiplex-intergrated-control-system__troubleshooting-b-can-system-diagnosis-test) ). Are there any DTCs indicated? YES - Do the appropriate troubleshooting for the DTC indicated. NO - Go to step 2 .
2. Disconnect the A/C pressure switch 4P connector.
3. Turn the ignition switch ON (II).
4. Measure the voltage between the No. 1 terminal of the A/C pressure switch 4P connector and body ground. Is there 5 V or more? YES - Go to step 5 . NO - Repair open in the wire between the relay control module and the A/C pressure switch.
5. Turn the ignition switch OFF.
6. Check for continuity between the No. 1 and No. 4 terminals of the A/C pressure switch. Is there continuity? YES - Go to step 7 . NO - Go to step 16
7. Reconnect the A/C pressure switch 4P connector.
8. Disconnect climate control unit connector A (20P).
9. Turn the ignition switch ON (II).
10. Measure the voltage between the No. 14 terminal of climate control unit connector A (20P) and body ground. Is there 5 V or more? YES - Go to step 11 . NO - Repair open in the wire between the climate control unit and the A/C pressure switch.
11. Turn the ignition switch OFF.
12. Measure the evaporator sensor resistance between the No. 5 and No. 18 terminals of climate control unit connector A (20P). CLIMATE CONTROL UNIT CONNECTOR A (20P) Is the resistance less than 24 kohm? YES - Go to step 13 . NO - Repair cause of high resistance in the evaporator temperature circuit.
13. Reconnect climate control unit connector A (20P).
14. Turn the ignition switch ON (II).
15. Check that blower motor operates at all speeds. Does the blower motor operate at all speeds? YES - Check for loose wires or poor connections at climate control unit connector A (20P) and at the A/C pressure switch 4P connector. If the connections are good, substitute a known-good climate control unit and recheck. If the symptom/indication goes away, replace the original climate control unit. NO - Repair the problem in the blower motor circuit.
16. Check for proper A/C system pressure. Is the pressure within specifications? YES - Replace the A/C pressure switch. NO - Repair the A/C pressure problem.

Scheme 111

1. Remove the in-car temperature sensor (see «IN-CAR TEMPERATURE SENSOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system) ).
2. Check for a change in resistance by heating the sensor with a hair drier or cooling the sensor in a cool cup of water.
3. Compare the resistance reading between the No. 1 and No. 2 terminals of the in-car temperature sensor with the specifications shown in the graph; the resistance should be within the specifications.
4. If the resistance is not as specified, replace the in-car temperature sensor (see «IN-CAR TEMPERATURE SENSOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system) ).

Scheme 112

1. Remove the driver's dashboard lower cover (see «DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION»(/acura/tl/iii-2003-2006/remont/exteriorinterior-trim/#dashboard) ).
2. Remove the self-tapping screws and the in-car temperature sensor (A) from the driver's dashboard lower cover (B).
3. Install the sensor in the reverse order of removal. Be sure to connect the air hose securely.

Scheme 113

1. Remove the outside air temperature sensor (see «OUTSIDE AIR TEMPERATURE SENSOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system) ).
2. Dip the sensor in ice water, and measure the resistance. Then pour warm water on the sensor, and check for a change in resistance.
3. Compare the resistance reading between the No. 1 and No. 2 terminals of the outside air temperature sensor with the specifications shown in the graph; the resistance should be within the specifications.
4. If the resistance is not as specified, replace the outside air temperature sensor (see «OUTSIDE AIR TEMPERATURE SENSOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system) ).

Scheme 114

1. Lift the tab (A) to release the lock, then remove the outside air temperature sensor (B) from the back of the front bumper beam. Disconnect the 2P connector (C) from the outside air temperature sensor.
2. Install the sensor in the reverse order of removal.

Scheme 115

1. Remove the sunlight sensor (A) from the dashboard.
2. Turn the ignition switch ON (II). Measure the voltage between the terminals with the (+) probe on the No. 2 terminal and the (-) probe on the No. 1 terminal with the 2P connector connected. NOTE: The voltage readings will not change under the light of a flashlight or a fluorescent lamp. Voltage should be: 3.6-3.7 V or more with the sensor out of direct sunlight. 3.3-3.5 V or less with the sensor in direct sunlight.
3. If the voltage is not as specified, replace the sunlight sensor (see «SUNLIGHT SENSOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system) ).

Scheme 116

1. Remove the sunlight sensor (A) from the sunlight sensor garnish (B), then disconnect the 2P connector (C). Be careful not to damage the sensor and the dashboard.
2. Install the sensor in the reverse order of removal.

Scheme 117

Scheme 118

1. Remove the evaporator temperature sensor (see «EVAPORATOR TEMPERATURE SENSOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system) ).
2. Dip the sensor in ice water, and measure the resistance between its terminals.
3. Then pour warm water on the sensor, and check for a change in resistance.
4. Compare the resistance readings with the specifications shown in the graph; the resistance should be within the specifications.
5. If the resistance is not as specified, replace the evaporator temperature sensor (see «EVAPORATOR TEMPERATURE SENSOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system) ).

Scheme 119

1. Remove the passenger's dashboard under cover (see «GLOVE BOX HOUSING REMOVAL/INSTALLATION»(/acura/tl/iii-2003-2006/remont/exteriorinterior-trim/#dashboard__glove-box-housing-removal-installation) ).
2. Disconnect the 4P connector (A) from the power transistor (B) then remove the self-tapping screws and carefully pull out the power transistor. Disconnect the 2P connector (C) from the evaporator temperature sensor (D), then remove the connector clip (E). Remove the self-tapping screw, and carefully pull out the evaporator temperature.
3. Install in the reverse order of removal.

Scheme 120

Scheme 121

1. Disconnect the 4P connector from the power transistor.
2. Measure the resistance between the No. 1 and No. 2 terminals of the power transistor. It should be about 1.5 kohm. If the resistance is within the specifications, go to step 3 . If the resistance is not within the specifications, replace the power transistor.
3. Carefully release the lock tab on the No. 4 terminal (BLU/YEL) (A) in the 4P connector, then remove the terminal and insulate it from body ground.
4. Reconnect the 4P connector to the power transistor.
5. Make sure the BLU/YEL wire is completely isolated, then supply 12 volts to the No. 4 cavity with a jumper wire.
6. Turn the ignition switch ON (II), and check that the blower motor runs. If the blower motor does not run, replace the power transistor. If the blower motor runs, the power transistor is OK.

Driver's Air Mix Control Motor Test

Note. Before testing, check for HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 122

1. Disconnect the 5P connector from the driver's air mix control motor. NOTE: Incorrectly applying power and ground to the driver's air mix control motor will damage it. Follow the instructions carefully.
2. Connect battery power to the No. 1 terminal of the driver's air mix control motor, and ground the No. 2 terminal; the driver's air mix control motor should run, and stop at Max Hot. If it doesn't, reverse the connections; the driver's air mix control motor should run, and stop at Max Cool. When the driver's air mix control motor stops running, disconnect the battery power immediately.
3. If the driver's air mix control motor did not run in step 2 , remove it, then check the driver's air mix control linkage and door for smooth movement. If the linkage and the door move smoothly, replace the driver's air mix control motor. If the linkage or the door sticks or binds, repair them as needed. If the driver's air mix control motor runs smoothly, go to step 4 .
4. Measure the resistance between the No. 4 and No. 5 terminals. It should be between 4.2 to 7.8 k ohm.
5. Reconnect the driver's air mix control motor 5P connector, then turn the ignition switch ON (II).
6. Using the backprobe set, measure the voltage between the No. 3 and No. 5 terminals. Max Cool-about 1.0 V Max Hot-about 4.0 V
7. If either the resistance or voltage readings are not as specified, replace the driver's air mix control motor.

Scheme 123

1. Remove the driver's dashboard lower cover (see «DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION»(/acura/tl/iii-2003-2006/remont/exteriorinterior-trim/#dashboard) ).
2. Disconnect the 10P connector (A) from the driver's mode control motor. Disconnect the 5P connector (B) from the driver's air mix control motor (C). Remove the self-tapping screws and the driver's air mix control motor from the heater unit.
3. Install the motor in the reverse order of removal. Make sure the pin on the motor is properly engaged with the linkage. After installation, make sure the motor runs smoothly.

Passenger's Air Mix Control Motor Test

Note. Before testing, check for HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 124

1. Disconnect the 5P connector from the passenger's air mix control motor. NOTE: Incorrectly applying power and ground to the passenger's air mix control motor will damage it. Follow the instructions carefully.
2. Connect battery power to the No. 1 terminal of the passenger's air mix control motor, and ground the No. 2 terminal; the passenger's air mix control motor should run, and stop at Max Hot. If it doesn't, reverse the connections; the passenger's air mix control motor should run, and stop at Max Cool. When the passenger's air mix control motor stops running, disconnect the battery power immediately.
3. If the passenger's air mix control motor did not run in step 2 , remove it, then check the passenger's air mix control linkage and door for smooth movement. If the linkage and the door move smoothly, replace the passenger's air mix control motor (see «PASSENGER'S AIR MIX CONTROL MOTOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__passengers-air-mix-control-motor-test) ). If the linkage or the door sticks or binds, repair them as needed. If the passenger's air mix control motor runs smoothly, go to step 4 .
4. Measure the resistance between the No. 4 and No. 5 terminals. It should be between 4.2 to 7.8 k ohm.
5. Reconnect the passenger's air mix control motor 5P connector, then turn the ignition switch ON (II).
6. Using the backprobe set, measure the voltage between the No. 3 and No. 5 terminals. Max Cool-about 1.0 V Max Hot-about 4.0 V
7. If either the resistance or voltage readings are not as specified, replace the passenger's air mix control motor (see «PASSENGER'S AIR MIX CONTROL MOTOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__passengers-air-mix-control-motor-test) ).

Scheme 125

1. Turn the ignition switch OFF.
2. Remove the glove box housing (see «GLOVE BOX HOUSING REMOVAL/INSTALLATION»(/acura/tl/iii-2003-2006/remont/exteriorinterior-trim/#dashboard__glove-box-housing-removal-installation) ).
3. Remove the throttle actuator control module (see «APP SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ).
4. Remove the climate control unit (see «CLIMATE CONTROL SWITCH ASSEMBLY REMOVAL AND INSTALLATION»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system) ).
5. Disconnect the 10P connector (A) from the passenger's mode control motor. Remove the retainer (B) from the passenger's air mix control motor (C), then disconnect the 5P connector (D) from the passenger's air mix control motor. Remove the self-tapping screws and the passenger's air mix control motor from the heater unit.
6. Install the motor in the reverse order of removal. Make sure the pin on the motor is properly engaged with the linkage. After installation, make sure the motor runs smoothly.

Driver's Mode Control Motor Test

Note. Before testing, check for HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 126

1. Disconnect the 10P connector from the driver's mode control motor. NOTE: Incorrectly applying power and ground to the driver's mode control motor will damage it. Follow the instructions carefully.
2. Connect battery power to the No. 2 terminal of the driver's mode control motor, and ground the No. 1 terminal; the driver's mode control motor should run smoothly, and stop at Vent. If it doesn't, reverse the connections; the driver's mode control motor should run smoothly, and stop at Defrost. When the driver's mode control motor stops running, disconnect battery power immediately.
3. If the driver's mode control motor did not run in step 2 , remove it, then check the driver's mode control linkage and doors for smooth movement. If the linkage and doors move smoothly, replace the driver's mode control motor (see «DRIVER'S MODE CONTROL MOTOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__drivers-mode-control-motor-test) ). If the linkage or doors stick or bind, repair them as needed. If the driver's mode control motor runs smoothly, go to step 4 .
4. Use a digital multimeter with an output of 1 mA or less at the 20 kohm range. With the driver's mode control motor running as in step 2 , check for continuity between the No. 6, 7, 8 and 9 terminals and the No. 10 terminal individually. There should be continuity for a moment at each terminal as the motor moves past the switch's terminal.
5. If there is no continuity for a moment at each terminal, replace the driver's mode control motor (see «DRIVER'S MODE CONTROL MOTOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__drivers-mode-control-motor-test) ).

Scheme 127

1. Remove the driver's dashboard under cover (see «DRIVER'S DASHBOARD UNDER COVER REMOVAL/INSTALLATION»(/acura/tl/iii-2003-2006/remont/exteriorinterior-trim/#dashboard) )
2. Disconnect the 10P connector (A) from the driver's mode control motor (B). Remove the self-tapping screws and the driver's mode control motor from the heater unit.
3. Install the motor in the reverse order of removal. After installation, make sure the motor runs smoothly.

Passenger's Mode Control Motor Test

Note. Before testing, check for HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 128

1. Disconnect the 10P connector from the passenger's mode control motor. NOTE: Incorrectly applying power and ground to the passenger's mode control motor will damage it. Follow the instructions carefully.
2. Connect battery power to the No. 2 terminal of the passenger's mode control motor, and ground the No. 1 terminal; the passenger's mode control motor should run smoothly, and stop at Vent. If it doesn't, reverse the connections; the passenger's mode control motor should run smoothly, and stop at Defrost. When the passenger's mode control motor stops running, disconnect battery power immediately.
3. If the passenger's mode control motor did not run in step 2 , remove it, then check the passenger's mode control linkage and doors for smooth movement. If the linkage and doors move smoothly, replace the passenger's mode control motor (see «PASSENGER'S MODE CONTROL MOTOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__passengers-mode-control-motor-test) ). If the linkage or doors stick or bind, repair them as needed. If the passenger's mode control motor runs smoothly, go to step 4 .
4. Use a digital multimeter with an output of 1 mA or less at the 20 k ohm range. With the passenger's mode control motor running as in step 2 , check for continuity between the No. 6,7, 8 and 9 terminals and the No. 10 terminal individually. There should be continuity for a moment at each terminal as the motor moves past the switch's terminal.
5. If there is no continuity for a moment at each terminal, replace the passenger's mode control motor (see «PASSENGER'S MODE CONTROL MOTOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__passengers-mode-control-motor-test) ).

Scheme 129

1. Turn the ignition switch OFF.
2. Set the passenger's mode to VENT.
3. Remove the glove box housing (see «GLOVE BOX HOUSING REMOVAL/INSTALLATION»(/acura/tl/iii-2003-2006/remont/exteriorinterior-trim/#dashboard__glove-box-housing-removal-installation) ).
4. Remove the throttle actuator control module (see «APP SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ).
5. Remove the climate control unit (see «CLIMATE CONTROL SWITCH ASSEMBLY REMOVAL AND INSTALLATION»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system) ).
6. Disconnect the 10P connector (A) from the passenger's mode control motor (B). Remove the self-tapping screws and the passenger's mode control motor from the heater unit.
7. Install the motor in the reverse order of removal. After installation, make sure the motor runs smoothly.

Recirculation Control Motor Test

Note. Before testing, check for HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 130

1. Disconnect the 5P connector from the recirculation control motor. NOTE: Incorrectly applying power and ground to the recirculation control motor will damage it. Follow the instructions carefully.
2. Connect battery power to the No. 5 terminal of the recirculation control motor, and ground the No. 1 and No. 2 terminals; the recirculation control motor should run smoothly. To avoid damaging the recirculation control motor, do not reverse power and ground. Disconnect the No. 1 or No. 2 terminals from ground; the recirculation control motor should stop at Fresh (when the No. 1 terminal is disconnected) or Recirculate (when the No. 2 terminal is disconnected). Don't cycle the recirculation control motor for a long time.
3. If the recirculation control motor did not run in step 2 , remove it, then check the recirculation control linkage and doors for smooth movement. If the linkage and doors move smoothly, replace the recirculation control motor (see «RECIRCULATION CONTROL MOTOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__recirculation-control-motor-test) ). If the linkage or doors stick or bind, repair them as needed.

Scheme 131

1. Turn the ignition switch OFF.
2. Remove the glove box housing (see «GLOVE BOX HOUSING REMOVAL/INSTALLATION»(/acura/tl/iii-2003-2006/remont/exteriorinterior-trim/#dashboard__glove-box-housing-removal-installation) ).
3. Remove the throttle actuator control module (see «APP SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ).
4. Disconnect the 5P connector (A) from the recirculation control motor (B). Remove the self-tapping screws and the recirculation control motor from the blower unit.
5. Install the motor in the reverse order of removal. Make sure the pin on the motor is properly engaged with the linkage. After installation, make sure the motor runs smoothly.

Scheme 132

Scheme 133

1. Remove the audio-HVAC display module assembly (see «DISPLAY AND CONTROL UNIT INPUT TEST»(/acura/tl/iii-2003-2006/remont/gauges-instrument-panels/#display-panel-control-system__display-and-control-unit-input-test) ).
2. Remove the self-tapping screws and the audio unit (A) and bracket (B) from the display panel control unit (C).
3. Disconnect 10P connector (A) and 16P connector (B) from the display panel control unit (C). Remove the self-tapping screws and the climate control switch assembly (D).
4. Install the control switch assembly in the reverse order of removal. After installation, operate the control switch assembly controls to see if they work properly.
5. Run the self-diagnostic function to confirm that there are no problems in the system (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system) ).

Scheme 134

1. Turn the ignition switch OFF.
2. Remove the glove box housing (see «GLOVE BOX HOUSING REMOVAL/INSTALLATION»(/acura/tl/iii-2003-2006/remont/exteriorinterior-trim/#dashboard__glove-box-housing-removal-installation) ).
3. Remove the throttle actuator control module (see «APP SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ).
4. Disconnect the connectors (A) from the climate control unit (B), then remove the wire harness clip (C), the self-tapping screws and the climate control unit.
5. Install the control unit in the reverse order of removal. After installation, operate the control switch assembly controls to see whether it works properly.
6. Run the self-diagnostic function to confirm that there are no problems in the system (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system) ).

Dust and Pollen Filter Replacement

Note. Dust and pollen filter may be an optional component on certain sub-models. Manufacturer does not provide identification information on which sub-models are equipped with filter.

The dust and pollen filter should be replaced every 30,000 miles (48,000 km) or 24 months, whichever comes first. Replace the filter more often if the airflow is less than usual, or if the vehicle is driven in areas that have high concentrations of soot from industry or diesel powered vehicles.

Scheme 135

Scheme 136

1. Remove the glove box housing (see «GLOVE BOX HOUSING REMOVAL/INSTALLATION»(/acura/tl/iii-2003-2006/remont/exteriorinterior-trim/#dashboard__glove-box-housing-removal-installation) ).
2. Remove the dust and pollen filter assembly from the evaporator.
3. Remove the filter (A) from the housing (B), and replace the filter.
4. Install the filter in the reverse order of removal. Make sure that there is no air leaking out of the evaporator.

Scheme 137

Scheme 138

1. Remove the glove box housing (see «GLOVE BOX HOUSING REMOVAL/INSTALLATION»(/acura/tl/iii-2003-2006/remont/exteriorinterior-trim/#dashboard__glove-box-housing-removal-installation) ).
2. Remove the relays (A) and the wire harness clips (B), then remove the bolts and the glove box frame (C). Remove the self tapping screws, and the glove box striker (D).
3. Disconnect the connectors (A) from the blower motor, and the recirculation control motor, then remove the wire harness clip (B) and the connector clip (C). Remove the mounting nuts, the mounting bolts and the blower unit (D). NOTE: One of the upper nuts is hidden behind the sound insulation. Look for a cut-out in the sound insulation.
4. Install the unit in the reverse order of removal. Make sure that there is no air leakage.

Blower Unit Component Replacement

Note these items when overhauling the blower unit

Scheme 139

1. The recirculation control motor (A), blower motor cooling hose (B), blower motor cover (C), the blower motor (D), and the dust and pollen filter (E) can be replaced without removing the blower unit.
2. Before reassembly, make sure that the recirculation control linkage and doors move smoothly without binding.
3. After reassembly, make sure the recirculation control motor runs smoothly (see «RECIRCULATION CONTROL MOTOR TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__recirculation-control-motor-test) ).

Scheme 140

Scheme 141

Scheme 142

1. Recover the refrigerant with a recovery/recycling/charging station (see «REFRIGERANT RECOVERY»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__refrigerant-recovery) ).
2. Remove the bolt, then disconnect the suction line (A) and the receiver line (B) from the evaporator core.
3. Remove the blower unit (see «DUST AND POLLEN FILTER REPLACEMENT»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__dust-and-pollen-filter-replacement) ).
4. Remove the throttle actuator control module (see «APP SENSOR REPLACEMENT»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#electronic-throttle-control-system) ).
5. Remove the climate control unit (see «CLIMATE CONTROL SWITCH ASSEMBLY REMOVAL AND INSTALLATION»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system) ).
6. Disconnect the connector (A) from the power transistor, then remove the wire harness clip (B) the self-tapping screws, and the expansion valve cover (C).
7. Carefully pull out the evaporator core without bending the pipes.
8. Install the core in the reverse order of removal, and note these items: If you're installing a new evaporator core, add refrigerant oil (DENSO ND-OIL 8) (see «A/C SERVICE TIPS AND PRECAUTIONS»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__ac-service-tips-and-precautions) ). Replace the O-rings with new ones at each fitting, and apply a thin coat of refrigerant oil before installing them. Be sure to use the correct O-rings for HFC-134a (R-134a) to avoid leakage. Immediately after using the oil, reinstall the cap on the container, and seal it to avoid moisture absorption. Do not spill the refrigerant oil on the vehicle; it may damage the paint; if the refrigerant oil contacts the paint, wash it off immediately. Make sure that there is no air leakage. Charge the system (see «SYSTEM CHARGING»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__system-charging) ).

Heater Unit/Core Replacement

SRS components are located in this area. Review the SRS component locations (see COMPONENT LOCATION INDEX ), and the precautions and procedures (see PRECAUTIONS AND PROCEDURES ) before performing repairs or service.

Scheme 143

Scheme 144

Scheme 145

Scheme 146

Scheme 147

Scheme 148

1. Make sure you have the anti-theft codes for the radio and the navigation system, then write down the XM radio channel presets.
2. Make sure the ignition is OFF, then disconnect the negative cable from the battery.
3. Disconnect the suction and receiver lines from the evaporator core (see «BLOWER UNIT COMPONENT REPLACEMENT»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__blower-unit-component-replacement) ).
4. From under the hood, open the cable clamp (A), then disconnect the heater valve cable (B) from the heater valve arm (C). Turn the heater valve arm to the fully opened position as shown.
5. When the engine is cool, drain the engine coolant from the radiator (see «COOLANT CHECK»(/acura/tl/iii-2003-2006/remont/cooling-system-mechanical/#cooling-system) ).
6. Slide the hose clamps (A) back, then disconnect the inlet heater hose (B) and the outlet heater hose (C) from the heater unit. Engine coolant will run out when the hoses are disconnected; drain it into a clean drip pan. Be sure not to let coolant spill on the electrical parts or the painted surfaces. If any coolant spills, rinse it off immediately.
7. Remove the mounting nut from the heater unit. Take care not to damage or bend the fuel lines and the brake lines, etc.
8. Remove the dashboard (see «DASHBOARD REMOVAL/INSTALLATION»(/acura/tl/iii-2003-2006/remont/exteriorinterior-trim/#dashboard) ).
9. Disconnect the connectors (A) from the driver's mode control motor, the driver's air mix control motor, the evaporator temperature sensor, the power transistor, the passenger's mode control motor, passenger's air mix control motor, and the recirculation control motor, then remove the wire harness clips (B), the wire harness (C), and the carpet clip (D).
10. Remove the heater ducts (A), then remove the mounting nuts and the blower-heater unit (B).
11. Remove the self-tapping screws, the evaporator temperature sensor (A) and the joint duct (B). Remove the self-tapping screws, then remove the passenger's heater outlet (C), and the heater core cover (D). Remove the self-tapping screws and the passenger's air mix control motor (E). Remove the self-tapping screws, the heater pipe brackets (F), the grommets (G) and carefully pull out the heater core (H) so you don't bend the inlet and outlet pipes.
12. Install the heater core and the evaporator core in the reverse order of removal.
13. Install the heater unit in the reverse order of removal, and note these items: Do not interchange the inlet and outlet heater hoses, and install the hose clamps securely. Refill the cooling system with engine coolant (see «COOLANT CHECK»(/acura/tl/iii-2003-2006/remont/cooling-system-mechanical/#cooling-system) ). Adjust the heater valve cable (see «HEATER VALVE CABLE ADJUSTMENT»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system) ). Make sure that there is no coolant leakage. Make sure that there is no air leakage. Refer to evaporator core replacement (see step 8 ). Enter the anti-theft codes for the radio and the navigation system, then enter the customer's XM radio channel presets.

Scheme 149

Scheme 150

Scheme 151

1. From under the hood, open the cable clamp (A), then disconnect the heater valve cable (B) from the heater valve arm (C).
2. From under the dash, disconnect the heater valve cable housing from the cable clamp (A), and disconnect the heater valve cable (B) from the air mix control linkage (C).
3. Set the temperature control dial to Max Cool (Lo) with the ignition switch ON (II).
4. Attach the heater valve cable (B) to the air mix control linkage (C) as shown in step 2 . Hold the end of the heater valve cable housing against the stop (D), then snap the heater valve cable housing into the cable clamp (A). NOTE: Make sure the ring-end of the cable is pushed all the way to the base of the pin on air mix control linkage.
5. From under the hood, turn the heater valve arm (C) to the fully closed position as shown, and hold it. Attach the heater valve cable (B) to the heater valve arm, and gently pull on the heater valve cable housing to take up any slack, then install the heater valve cable housing into the cable clamp (A).

A/C Compressor Replacement

Note. Do not install an A/C compressor into a system unless you are completely sure that the system is free of contamination. Installing an A/C compressor into a contaminated system can result in premature A/C compressor failure.

Scheme 152

Scheme 153

Scheme 154

1. If the A/C compressor is marginally operable, run the engine at idle speed, and let the air conditioning work for a few minutes, then shut the engine off.
2. Make sure you have the anti-theft codes for the radio and the navigation system, then write down XM radio channel presets.
3. Make sure the ignition is OFF, then disconnect the negative cable from the battery.
4. Recover the refrigerant with a recovery/recycling/charging station (see «REFRIGERANT RECOVERY»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__refrigerant-recovery) ).
5. Remove the intake manifold cover (see step 1 on «IGNITION COIL REMOVAL/INSTALLATION»(/acura/tl/iii-2003-2006/remont/ignition-system/#ignition-system) ), and the alternator (see «ALTERNATOR REMOVAL AND INSTALLATION»(/acura/tl/iii-2003-2006/remont/charging-system/#charging-system) ).
6. Remove the A/C compressor clutch connector (A) from the A/C condenser fan shroud (B). Disconnect the A/C condenser fan connector (C), then remove the wire harness clip (D) from the A/C condenser fan shroud. Remove the hose (E) from the radiator (F). Loosen the lower mounting bolt, then remove the upper mounting bolts and the radiator fan shroud. Be careful not to damage the radiator fins when removing the A/C condenser fan shroud.
7. Disconnect the A/C compressor clutch connector (A). Remove the bolt and the nuts, then disconnect the suction line (B) and discharge line (C) from the A/C compressor. Plug or cap the lines immediately after disconnecting them to avoid moisture and dust contamination.
8. Remove the mounting bolts and the A/C compressor. Be careful not to damage the radiator fins when removing the A/C compressor.
9. Install the A/C compressor in the reverse order of removal, and note these items: Inspect the A/C lines for any signs of contamination. Purge the system if necessary before installing the A/C compressor. If you're installing a new A/C compressor, you must calculate the amount of refrigerant oil to be removed from it (see «A/C SERVICE TIPS AND PRECAUTIONS»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__ac-service-tips-and-precautions) ). A new A/C compressor comes with a full charge of oil. Replace the O-rings with new ones at each fitting, and apply a thin coat of refrigerant oil before installing them. Be sure to use the correct O-rings for HFC-134a (R-134a) to avoid leakage. Use refrigerant oil (DENSO ND-OIL 8) for HFC-134a DENSO piston type A/C compressor only. To avoid contamination, do not return the oil to the container once dispensed, and never mix it with other refrigerant oils. Immediately after using the oil, reinstall the cap on the container, and seal it to avoid moisture absorption. Do not spill the refrigerant oil on the vehicle; it may damage the paint; if the refrigerant oil contacts the paint, wash it off immediately. Be careful not to damage the radiator fins when installing the A/C compressor and the A/C condenser fan shroud. Charge the system (see «SYSTEM CHARGING»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__system-charging) ). Enter the anti-theft codes for the radio and the navigation system, then enter the customer's XM radio channel presets.

Scheme 155

Scheme 156

Scheme 157

1. Check the pressure plate for discoloration, peeling, or other damage. If there is damage, replace the clutch set (see «A/C COMPRESSOR CLUTCH OVERHAUL»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__ac-compressor-clutch-overhaul) ).
2. Check the pulley bearing play and drag by rotating the pulley by hand. Replace the clutch set with a new one if it is noisy or has excessive play/drag (see «A/C COMPRESSOR CLUTCH OVERHAUL»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__ac-compressor-clutch-overhaul) ).
3. Measure the clearance between the rotor pulley (A) and the pressure plate (B) all the way around. If the clearance is not within specified limits, remove the pressure plate (see «A/C COMPRESSOR CLUTCH OVERHAUL»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__ac-compressor-clutch-overhaul) ) and add or remove shims as needed to increase or decrease clearance. Clearance: 0.35-0.60 mm (0.014-0.024 in.) NOTE: The shims are available in three thicknesses: 0.1 mm, 0.3 mm and 0.5 mm.
4. Check resistance of the field coil. If resistance is not within specifications, replace the field coil (see «A/C COMPRESSOR CLUTCH OVERHAUL»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__ac-compressor-clutch-overhaul) ).

A/C Compressor Clutch Overhaul

Special Tools Required

A/C clutch holder, Robinair 10204 or Kent-Moore J37872, or Honda Tool and Equipment KMT-J33939, commercially available

Scheme 158

Scheme 159

Scheme 160

Scheme 161

1. Remove the center bolt (A) while holding the pressure plate with a commercially available A/C clutch holder (B).
2. Remove the pressure plate (A) and shim(s) (B), taking care not to lose the shim(s). If the clutch needs adjustment, increase or decrease the number and thickness of shims as necessary, then reinstall the pressure plate, and recheck its clearance (see «A/C COMPRESSOR CLUTCH CHECK»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system) ). NOTE: The shims are available in three thicknesses: 0.1 mm, 0.3 mm and 0.5 mm.
3. If you are replacing the field coil, remove the snap ring (A) with snap ring pliers, then remove the pulley (B). Be careful not to damage the pulley or the A/C compressor.
4. Remove the screw from the field coil ground terminal (A), then remove the wire harness (B) and the bracket (C). Disconnect the field coil connector (D). Remove the snap ring (E) with snap ring pliers, then remove the field coil (F). Be careful not to damage the field coil or the A/C compressor.
5. Reassemble the clutch in the reverse order of disassembly, and note these items: Install the field coil with the wire side facing down, and align the boss on the field coil with the hole in the A/C compressor. Clean the pulley and A/C compressor sliding surfaces with contact cleaner or other non-petroleum solvent. Install new snap rings, note the installation direction, and make sure they are fully seated in the groove. Make sure that the pulley turns smoothly after it's reassembled. Route and clamp the wires properly or they can be damaged by the pulley.

Scheme 162

1. Recover the refrigerant with a recovery/recycling/charging station (see «REFRIGERANT RECOVERY»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__refrigerant-recovery) ).
2. Remove the relief valve (A) and the O-ring (B). Plug the opening to keep foreign matter from entering the system and the A/C compressor oil from running out.
3. Clean the mating surfaces.
4. Replace the O-ring with a new one at the relief valve, and apply a thin coat of refrigerant oil before installing it.
5. Remove the plug, and install and tighten the relief valve.
6. Charge the system (see «SYSTEM CHARGING»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__system-charging) ).

Scheme 163

Scheme 164

Scheme 165

Scheme 166

Scheme 167

Scheme 168

1. Make sure you have the anti-theft code for the radio and the navigation system, then wire down the XM radio channel presets.
2. Recover the refrigerant with a recovery/recycling charging station (see «REFRIGERANT RECOVERY»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__refrigerant-recovery) ).
3. Remove the front bulkhead cover (see «FRONT GRILLE LOWER MOLDING REPLACEMENT»(/acura/tl/iii-2003-2006/remont/exteriorinterior-trim/#exterior-trim) ).
4. Make sure the ignition is OFF, then remove the battery and the battery box.
5. Remove the clips (A), then remove the air intake cover (B).
6. Remove the bolts and the radiator upper mount brackets.
7. Remove the bolt, then disconnect the receiver line (A) from the A/C condenser. Disconnect the A/C pressure switch connector (B).
8. Remove the bolts from the A/C condenser.
9. Remove the bolt, then disconnect the discharge line from the A/C condenser.
10. Remove the A/C condenser by lifting it up. Be careful not to damage the radiator and A/C condenser fins when removing the A/C condenser.
11. Install the A/C condenser in the reverse order of removal, and note these items: If you're installing a new A/C condenser, add refrigerant oil (DENSO ND-OIL 8) (see «A/C SERVICE TIPS AND PRECAUTIONS»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__ac-service-tips-and-precautions) ). Replace the O-rings with new ones at each fitting, and apply a thin coat of refrigerant oil before installing them. Be sure to use the correct O-rings for HFC-134a (R-134a) to avoid leakage. Immediately after using the oil, reinstall the cap on the container, and seal it to avoid moisture absorption. Do not spill the refrigerant oil on the vehicle; it may damage the paint; if the refrigerant oil contacts the paint, wash it off immediately. Charge the system (see «SYSTEM CHARGING»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__system-charging) ). Enter the anti-theft codes for the radio and the navigation system, then enter the customer's XM radio channel presets.

Receiver/Dryer Desiccant Replacement

Note. Install the Receiver/Dryer as quickly as possible to preset the system from absorbing moisture from the air.

Scheme 169

1. Remove the A/C condenser (see «A/C CONDENSER REPLACEMENT»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system) ).
2. Remove the bolts from the A/C condenser, then remove the receiver/dryer (A), the bracket (B) and the O-rings (C).
3. Install the receiver/dryer in the reverse order of removal, and note these items: Replace the O-rings with new ones, and apply a thin coat of refrigerant oil (DENSO ND-OIL 8) before installing them. Be sure to use the correct O-rings for HFC-134a (R-134a) to avoid leakage.

Refrigerant Recovery

If accidental system discharge occurs, ventilate work area before resuming service.

Additional health and safety information may be obtained from the refrigerant and lubricant manufacturers.

Scheme 170

1. Connect an R-134a refrigerant recovery/recycling/charging station (A) to the high-pressure service port (B) and the low-pressure service port (C), as shown, following the equipment manufacturer's instructions.
2. Measure the amount of refrigerant oil removed from the A/C system after the recovery process is completed. Be sure to put the same amount of new refrigerant oil back into the A/C system before charging.

System Evacuation

If accidental system discharge occurs, ventilate work area before resuming service.

Additional health and safety information may be obtained from the refrigerant and lubricant manufacturers.

Scheme 171

1. When an A/C system has been opened to the atmosphere, such as during installation or repair, it must be evacuated using an R-134a refrigerant recovery/recycling/charging station. (If the system has been open for several days, the receiver/dryer should be replaced, and the system should be evacuated for several hours.)
2. Connect an R-134a refrigerant recovery/recycling/charging station (A) to the high-pressure service port (B) and the low-pressure service port (C), as shown, following the equipment manufacturer's instructions. Evacuate the system.
3. If the low-pressure does not reach more than 93.3 kPa (700 mmHg, 27.6 in.Hg) in 15 minutes, there is probably a leak in the system. Partially charge the system, and check for leaks (see step 3 ).

System Charging

If accidental system discharge occurs, ventilate work area before resuming service.

Additional health and safety information may be obtained from the refrigerant and lubricant manufacturers.

Scheme 172

1. Connect an R-134a refrigerant recovery/recycling/charging station (A) to the high-pressure service port (B) and the low-pressure service port (C), as shown, following the equipment manufacturer's instructions.
2. Evacuate the system (see «SYSTEM EVACUATION»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__system-evacuation) ).
3. Add the same amount of new refrigerant oil to the system that was removed during recovery. Use only DENSO ND-OIL 8 refrigerant oil.
4. Charge the system with the specified amount of R-134a refrigerant. Do not overcharge the system; the compressor will be damaged. Select the appropriate units of measure for your refrigerant charging station. Refrigerant Capacity: 500 to 550 g 0.50 to 0.55 kg 1.1 to 1.2 lbs 17.6 to 19.4 oz
5. Check for refrigerant leaks (see «REFRIGERANT LEAK TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system__refrigerant-leak-test) ).
6. Check for system performance (see «A/C SYSTEM TEST»(/acura/tl/iii-2003-2006/remont/automatic-hvac-system/#climate-control-system) ).

Refrigerant Leak Test

Special Tools Required

Leak detector, Honda Tool and Equipment YGK-H-10PM commercially available

Note. If accidental system discharge occurs, ventilate work area before resuming service. Additional health and safety information may be obtained from the refrigerant and lubricant manufacturers.

Scheme 173

1. Connect an R-134a refrigerant recovery/recycling/charging station (A) to the high-pressure service port (B) and the low-pressure service port (C), as shown, following the equipment manufacturer's instructions.
2. Open high pressure valve to charge the system to the specified capacity, then close the supply valve, and disconnect the charging station fittings. Select the appropriate units of measure for your refrigerant charging station. Refrigerant Capacity: 500 to 550 g 0.50 to 0.55 kg 1.1 to 1.2 lbs 17.6 to 19.4 oz
3. Check the system for leaks using an R-134a refrigerant leak detector with an accuracy of 14 g (0.5 oz) per year or better.
4. If you find leaks that require the system to be opened (to repair or replace hoses, fittings, etc.), recover the system.
5. After checking and repairing leaks, the system must be evacuated.

Performance Test

The performance test will help determine if the air conditioner system is operating within specifications.

Note. If accidental system discharge occurs, ventilate work area before resuming service. Additional health and safety information may be obtained from the refrigerant and lubricant manufacturers.

Scheme 174

Scheme 175

1. Connect an R-134a refrigerant recovery/recycling/charging station to the high-pressure service port and the low-pressure service port, following the equipment manufacturer's instructions.
2. Determine the relative humidity and air temperature.
3. Remove the glove box housing (see «GLOVE BOX HOUSING REMOVAL/INSTALLATION»(/acura/tl/iii-2003-2006/remont/exteriorinterior-trim/#dashboard__glove-box-housing-removal-installation) ).
4. Insert a thermometer (A) in the center vent.
5. Place a thermometer (B) near the blower unit's recirculation inlet duct.
6. Test conditions: Avoid direct sunlight. Open hood. Open front doors. Set the temperature control dial to LO and turn off the dual mode. Run the engine at 1,500 rpm. No driver or passengers in vehicle.
7. After running the air conditioning for 10 minutes under the above test conditions, read the delivery temperature from the thermometer in the center vent, the intake temperature near the blower unit, and the discharge (high) and suction (low) pressures on the A/C gauges.
8. To complete the tables: Mark the delivery temperature along the vertical line. Mark the intake temperature (ambient air temperature) along the bottom line. Draw a line straight up from the air temperature to the humidity. Mark a point 10% above and 10% below the humidity level. From each point, draw a horizontal line across the delivery temperature. The delivery temperature should fall between the two lines. Complete the low-side pressure test and high-side pressure test in the same way. Any measurements outside the line may indicate the need for further inspection. Example Intake temperature (dry): 86°F (30°C) Humidity level 70% Intake temperature (wet): 77.9°F (25.5°C) Intake pressure: 314 kPa (3.2 kgf/cm 2 ) (45.5 psi) Delivery temperature: 63.5°F (17.5°C) Delivery pressure: 1304 kPa (13.3 kgf/cm 2 ) (189.2 psi) Results: Within normal range

Pressure Test

PRESSURE TEST

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) (If electrical maintenance required)

The Acura TL SRS includes a driver's airbag in the steering wheel hub, a passenger's airbag in the dashboard above the glove box, seat belt tensioners in the front seat belt retractors, side curtain airbags in the sides of the roof, and side airbags in the front seat-backs. Information necessary to safely service the SRS is included in this article. Items marked with an asterisk ( * ) on the contents page include or are located near SRS components. Servicing, disassembling, or replacing these items require special precautions and tools, and should be done only by an authorized Acura dealer.

1. To avoid rendering the SRS inoperative, which could lead to personal injury or death in the event of a severe frontal or side collision, all SRS service work must be performed by an authorized Acura dealer.
2. Improper service procedures, including incorrect removal and installation of the SRS, could lead to personal injury caused by unintentional deployment of the airbags and/or side airbags.
3. Do not bump or impact the SRS unit, front impact sensors, or side impact sensors when the ignition switch is ON (II), or for at least 3 minutes after the ignition switch is turned OFF; otherwise, the system may fail in a collision, or the airbags may deploy.
4. SRS electrical connectors are identified by yellow color coding. Related components are located in the steering column, front console, dashboard, dashboard lower panel, in the dashboard above the glove box, in the front seats, in the roof side, and around the floor. Do not use electrical test equipment on these circuits.

See also:
• SYMPTOM TROUBLESHOOTING
• TROUBLESHOOTING -- B-CAN SYSTEM DIAGNOSIS TEST MODE A
• DTC P0116: ECT SENSOR CIRCUIT RANGE/PERFORMANCE PROBLEM (2004-2005 MODELS)
• GENERAL TROUBLESHOOTING INFORMATION
• POWER RELAY TEST
• BATTERY TEST
• CHARGING SYSTEM INDICATOR CIRCUIT TROUBLESHOOTING
• SYMPTOM TROUBLESHOOTING INDEX
• ECM/PCM IDLE LEARN PROCEDURE
• DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION
• GLOVE BOX HOUSING REMOVAL/INSTALLATION
• APP SENSOR REPLACEMENT
• DISPLAY AND CONTROL UNIT INPUT TEST
• COMPONENT LOCATION INDEX
• COOLANT CHECK
• IGNITION COIL REMOVAL/INSTALLATION
• FRONT GRILLE LOWER MOLDING REPLACEMENT
• B1202
• B1225
• B1226
• B1235
• B1238
• B1240
• B1243
• RADIATOR AND A/C CONDENSER FAN LOW SPEED CIRCUIT TROUBLESHOOTING
• A/C CONDENSER FAN HIGH SPEED CIRCUIT TROUBLESHOOTING
• RADIATOR AND A/C CONDENSER FAN HIGH SPEED CIRCUIT TROUBLESHOOTING
• A/C COMPRESSOR CLUTCH CIRCUIT TROUBLESHOOTING
• A/C PRESSURE SWITCH CIRCUIT TROUBLESHOOTING
• DRIVER'S AIR MIX CONTROL MOTOR TEST
• PASSENGER'S AIR MIX CONTROL MOTOR TEST
• DRIVER'S MODE CONTROL MOTOR TEST
• PASSENGER'S MODE CONTROL MOTOR TEST
• RECIRCULATION CONTROL MOTOR TEST
• REFRIGERANT RECOVERY
• DUST AND POLLEN FILTER REPLACEMENT
• A/C SERVICE TIPS AND PRECAUTIONS
• SYSTEM CHARGING
• BLOWER UNIT COMPONENT REPLACEMENT
• A/C COMPRESSOR CLUTCH OVERHAUL
• SYSTEM EVACUATION
• REFRIGERANT LEAK TEST