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How to Retrieve a Diagnostic Trouble Codes
The climate control unit has a self-diagnostic function.
Running the Self-diagnostic Function
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- Turn the ignition switch ON (II).
- Set the driver's temperature control dial on MAX cool.
- Press and hold the AUTO button.
- While holding the AUTO button, press and hold the OFF button. The self-diagnosis begins. If there is any abnormality in the system, the temperature indicator will light up the segment (A through N) corresponding to the error. If no DTCs are found, go to «SYMPTOM TROUBLESHOOTING INDEX»(ref-243355-S35113190542006082300000) . The temperature indicator will then alternate every second between displaying "88" (all segments lit) and the error code segment (A through N). NOTE: The system will only display the DTC when the AUTO and OFF buttons are pressed. If you release the buttons, the display will go blank. To return the display, simply press the AUTO then the OFF buttons again. To determine the meaning of the DTC, refer to the DTC troubleshooting index. If there is no abnormality, the segments will not light up. NOTE: If there are no DTCs detected (no opens or shorts in the climate control circuits or sensors), and the system is still not operating properly, check the sensor input to the climate control unit.
- 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.
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, and L come on at the same time, there may be an open in the common ground wire of the sensors.
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| DTC (Temperature Indicator Segment) | Detection Item | Reference |
|---|---|---|
| A | An open in the in-car temperature sensor circuit | (see DTC Indicator A: An Open In The In-Car Temperature Sensor Circuit ) |
| B | A short in the in-car temperature sensor circuit | (see DTC indicator B: A Short in the In-car Temperature Sensor Circuit ) |
| C | An open in the outside air temperature sensor circuit | (see DTC indicator C: An Open in the Outside Air Temperature Sensor Circuit ) |
| D | A short in the outside air temperature sensor circuit | (see DTC indicator D: A Short in the Outside Air Temperature Sensor Circuit ) |
| E | An open in the sunlight sensor circuit | (see DTC Indicator E: An Open In The Sunlight Sensor Circuit ) |
| F | A short in the sunlight sensor circuit | (see DTC indicator F: A Short in the Sunlight Sensor Circuit ) |
| G | An open in the evaporator temperature sensor circuit | (see DTC Indicator G: An Open in the Evaporator Temperature Sensor Circuit ) |
| H | A short in the evaporator temperature sensor circuit | (see DTC Indicator H: A Short in the Evaporator Temperature Sensor Circuit ) |
| I | An open in the air mix control motor circuit | (see DTC Indicator I: An Open in the Air Mix Control Motor Circuit ) |
| J | A short in the air mix control motor circuit | (see DTC Indicator J: A Short in the Air Mix Control Motor Circuit ) |
| K | A problem in the air mix control linkage, door, or motor | (see DTC Indicator K: A Problem in the Air Mix Control Linkage, Door, or Motor ) |
| L | An open or short in the mode control motor circuit | (see DTC Indicator L: An Open or Short in the Mode Control Motor Circuit ) |
| M | A problem in the mode control linkage, doors, or motor | (see DTC indicator M: A Problem in the Mode Control Linkage, Doors, or Motor ) |
| N | A problem in the blower motor circuit | (see DTC Indicator N: A Problem in the Blower Motor Circuit ) |
DETECTION ITEMS AND REFERENCE
System Description
The air conditioning system removes heat from the passenger compartment by transferring heat from the ambient air to the evaporator. The evaporator cools the air with the refrigerant that is circulating through the evaporator. The refrigerant expands in the evaporator, and the evaporator becomes very cold and absorbs the heat from the ambient air. The blower fan pushes air across the evaporator where the heat is absorbed, and then it blows the cool air into the passenger compartment.
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This vehicle uses HFC-134a (R-134a) refrigerant which does not contain chloro fluoro carbons. Pay attention to the following service items
- Do not mix refrigerants CFC-12 (R-12) and HFC-134a (R-134a). They are not compatible.
- Use only the recommended poly alkylene glycol (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.
- 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.
- Use a halogen gas leak detector designed for refrigerant R-134a.
- 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.
- Always recover the refrigerant R-134a with an approved recovery/recycling/charging station before disconnecting any A/C fitting.
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CONNECTOR A ([] on Circuit Diagram)
| Cavity | Wire color | Signal | |
|---|---|---|---|
| 1 | GRN/ORN | REAR AIR MIX HOT | OUTPUT |
| 2 | PNK | REAR AIR MIX COOL | OUTPUT |
| 3 | GRN | REAR POWER TRANSISTOR CONTROL | OUTPUT |
| 4 | RED/GRN | REAR BLOWER FEEDBACK | INPUT |
| 6 | YEL | REAR H3 | INPUT |
| 7 | YEL/WHT | REAR H2 | INPUT |
| 8 | GRN/RED | REAR H1 | INPUT |
| 9 | LT BLU | REAR C1 | INPUT |
| 10 | LT GRN | REAR C2 | INPUT |
| 11 | GRN/WHT | REAR MODE VENT | OUTPUT |
| 12 | BLU/ORN | REAR MODE HEAT | OUTPUT |
| 14 | BRN/YEL | REAR AIR MIX POTENTIAL | INPUT |
| 16 | RED/YEL | REAR INDICATOR | OUTPUT |
| 17 | GRN/ORN | NAVIGATION UNIT | INPUT |
| 18 | YEL/BLU | NAVIGATION UNIT | OUTPUT |
| 19 | RED/GRN | NAVIGATION UNIT | OUTPUT |
| 20 | YEL/BLU | REAR C3 | INPUT |
CLIMATE CONTROL UNIT CONNECTOR A (20P) TERMINALS REFERENCE
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CONNECTOR B (O on Circuit Diagram)
| Cavity | Wire color | Signal | |
|---|---|---|---|
| 1 | BLU/WHT | PCM (VSS) | INPUT |
| 3 | YEL/GRN | SENSOR COMMON GROUND | OUTPUT |
| 4 | BLU/YEL | MODE4 | INPUT |
| 5 | LT GRN/BLK | MODE3 | INPUT |
| 6 | GRN/YEL | MODE2 | INPUT |
| 7 | GRN/BLK | MODE1 | INPUT |
| 8 | BLU/BLK | MODE DEF | OUTPUT |
| 9 | BLU/ORN | MODE VENT | OUTPUT |
| 10 | WHT | AIR MIX COOL | OUTPUT |
| 11 | RED/YEL | AIR MIX HOT | OUTPUT |
| 13 | BLK/YEL | IG2 (Power) | INPUT |
| 14 | RED/BLK | TAILLIGHT | RELAY INPUT |
| 15 | BLU/RED | BLOWER FEEDBACK | INPUT |
| 16 | ORN/BLK | POWER TRANSISTOR CONTROL | OUTPUT |
| 17 | PNK/BLK | AIR MIX POTENTIAL | INPUT |
| 18 | YEL/RED | IN-CAR TEMPERATURE SENSOR | INPUT |
| 19 | BRN/WHT | OUTSIDE AIR TEMPERATURE SENSOR | INPUT |
| 20 | WHT/BLK | SUNLIGHT SENSOR | INPUT |
| 21 | BRN | EVAPORATOR TEMPERATURE SENSOR | INPUT |
| 22 | RED/WHT | ENGINE COOLANT TEMPERATURE (ECT) SENSOR | INPUT |
| 23 | GRY | AIR MIX POTENTIAL +5 V | OUTPUT |
| 25 | GRN/RED | FRESH | OUTPUT |
| 26 | GRN/WHT | RECIRCULATE | OUTPUT |
| 27 | RED/ORN | A/C PRESSURE SWITCH | OUTPUT |
| 28 | BRN/YEL | REAR WINDOW DEFOGGER RELAY | OUTPUT |
| 29 | BLK | GROUND (G401) | INPUT |
| 30 | RED | MULTIPLEX CONTROL UNIT (DRIVER'S) | INPUT |
CLIMATE CONTROL UNIT CONNECTOR B (30P) TERMINALS REFERENCE
