Climate Control System: Overview Acura RSX I facelift

System Description

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

Scheme 2

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 (KEIHIN SP-10) 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 (A/C 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 the R-134a air conditioning systems.
6. Always recover the refrigerant R-134a with an approved recovery/recycling/charging station before disconnecting any A/C fitting.

Scheme 3

Scheme 4

Scheme 5

Scheme 6

Scheme 7

Scheme 8

1. Remove the in-car temperature sensor (see «IN-CAR TEMPERATURE SENSOR TEST»(ref-218822-S03893966562006021000000) ).
2. Measure the resistance between the No. 1 and No. 2 terminals of the in-car temperature sensor. * Check for a change in resistance by heating or cooling the sensor with a hair dryer. * Is the resistance within the specifications shown on the graph? YES - Go to step 3. NO - Replace the in-car temperature sensor.
3. Disconnect the climate control unit 30P connector.
4. Check for continuity between the No. 8 terminal of the climate control unit 30P connector and the No. 1 terminal of the in-car temperature sensor 2P connector. Is there continuity? YES - Go to step 5. NO - Repair open in the wire between the climate control unit and the in-car temperature sensor.
5. Check for continuity between the No. 2 terminal of the climate control unit 30P connector and the No. 2 terminal of the in-car temperature sensor 2P connector. Is there continuity? YES - Check for loose wires or poor connections at the climate control unit 30P connector 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.

Scheme 9

1. Remove the in-car temperature sensor (see «IN-CAR TEMPERATURE SENSOR TEST»(ref-218822-S03893966562006021000000) ).
2. Test the in-car temperature sensor (see «IN-CAR TEMPERATURE SENSOR TEST»(ref-218822-S03893966562006021000000) ) Is the in-car temperature sensor OK? YES - Go to step 3. NO - Replace the in-car temperature sensor.
3. Disconnect the climate control unit 30P connector.
4. Check for continuity between the No. 8 terminal of the climate control unit 30P connector 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 - Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit.

Scheme 10

Scheme 11

Scheme 12

1. Remove the outside air temperature sensor (see «OUTSIDE AIR TEMPERATURE SENSOR TEST»(ref-218822-S33707528722006021000000) ).
2. Measure the resistance between the No. 1 and No. 2 terminals of the outside air temperature sensor. * Dip the sensor in ice water, and measure resistance. Then pour warm water on the sensor, and check for a change in resistance. * Is the resistance within the specifications shown on the graph? YES - Go to step 3. NO - Replace the outside air temperature sensor.
3. Disconnect the climate control unit 30P connector.
4. Check for continuity between the No. 7 terminal of the climate control unit 30P connector and the No. 2 terminal of the outside air temperature sensor 2P connector. Is there continuity? YES - Go to step 5. NO - Repair open in the wire between the climate control unit and the outside air temperature sensor.
5. Check for continuity between the No. 2 terminal of the climate control unit 30P connector and the No. 1 terminal of the outside air temperature sensor 2P connector. Is there continuity? YES - Check for loose wires or poor connections at the climate control unit 30P connector 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.

Scheme 13

1. Remove the outside air temperature sensor (see «OUTSIDE AIR TEMPERATURE SENSOR TEST»(ref-218822-S33707528722006021000000) ).
2. Test the outside air temperature sensor (see «OUTSIDE AIR TEMPERATURE SENSOR TEST»(ref-218822-S33707528722006021000000) ). Is the outside air temperature sensor OK? YES - Go to step 3. NO - Replace the outside air temperature sensor.
3. Disconnect the climate control unit 30P connector.
4. Check for continuity between the No. 7 terminal of the climate control unit 30P connector 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 - Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit.

Scheme 14

Scheme 15

1. Disconnect the sunlight sensor 2P connector.
2. Disconnect the climate control unit 30P connector.
3. Check for continuity between the No. 6 terminal of the climate control unit 30P connector and the No. 1 terminal of the sunlight sensor 2P connector. Is there continuity? YES - Go to step 4. NO - Repair open in the wire between the climate control unit and the sunlight sensor.
4. Check for continuity between the No. 2 terminal of the climate control unit 30P connector and the No. 2 terminal of the sunlight sensor 2P connector. Is there continuity? YES - Go to step 5. NO - Repair open in the wire between the climate control unit and the sunlight sensor.
5. Reconnect the sunlight sensor 2P connector.
6. Reconnect the climate control unit 30P connector.
7. Test the sunlight sensor (see «SUNLIGHT SENSOR TEST»(ref-218822-S32427988612006021000000) ). Is the sunlight sensor OK? YES - Check for loose wires or poor connections at the climate control unit 30P connector 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 - Replace the sunlight sensor.

Scheme 16

1. Disconnect the sunlight sensor 2P connector.
2. Disconnect the climate control unit 30P connector.
3. Check for continuity between the No. 6 terminal of the climate control unit 30P connector 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 4.
4. Reconnect the sunlight sensor 2P connector.
5. Reconnect the climate control unit 30P connector.
6. Test the sunlight sensor (see «SUNLIGHT SENSOR TEST»(ref-218822-S32427988612006021000000) ). Is the sunlight sensor 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 sunlight sensor.

Scheme 17

1. Disconnect the air mix control motor 5P connector.
2. Disconnect the climate control unit 30P connector.
3. Check for continuity between the following terminals of the climate control unit 30P connector and the air mix control motor 5P connector. CONTINUITY CHECK SPECIFICATION 30P 5P No. 2 No. 4 No. 4 No. 5 No. 9 No. 3 No. 20 No. 1 No. 21 No. 2 Is there continuity? YES - Check for loose wires or poor connections at the climate control unit 30P connector and at the air mix control motor 5P connector. If the connections are good, substitute a known-good air mix control motor, and recheck. If the symptom/indication goes away, replace the original air mix control motor. If the symptom/indication continues, 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 air mix control motor.

Scheme 18

Scheme 19

1. Disconnect the air mix control motor 5P connector.
2. Disconnect the climate control unit 30P connector.
3. Check for continuity between body ground and the climate control unit 30P connector terminals No. 2, 4, 9,20, and 21 individually. Is there continuity? YES - Repair any short to body ground in the wire(s) between the climate control unit and the air mix control motor. NO - Go to step 4.
4. 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 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 air mix control motor, and recheck. If the symptom/indication goes away, replace the original air mix control motor. If the symptom/indication continues, substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original heater control panel.