FRONT CLIMATE CONTROL UNIT INSPECTION
- Connect the front climate control unit connector.
- Turn the ignition switch to the ON position.
- Connect the negative (-) lead of the tester to body ground.
- By inserting the positive (+) lead of the tester into each front climate control unit terminal, measure the voltage according to the terminal voltage table. If there is any malfunction, inspect the parts under "Inspection item (s)". If the parts under "Inspection item (s)" are found to be normal, replace the front climate control unit.
Scheme 49
| Terminal | Signal name | Connected to | Measurement condition | Voltage (V) | Inspection item (s) | |
|---|---|---|---|---|---|---|
| 1A | Motor operation | Driver-side front air mix actuator | Temperature control dial (driver side): Moving towards COLD | 1.0 or less | Wiring harness: continuity, short circuit (Front climate control unit-driver-side front air mix actuator: 1A-G, 1F-F) Driver-side front air mix actuator | |
| Temperature control dial (driver side): Moving towards HOT | B+ | |||||
| 1B | B+ | BCM | Under any condition | B+ | Wiring harness: continuity, short circuit (Front climate control unit-BCM: 1B-5H) BCM | |
| 1C | Motor operation | Passenger-side front air mix actuator | Temperature control dial (passenger side): Moving towards COLD | B+ | Wiring harness: continuity, short circuit (Front climate control unit-passenger-side front air mix actuator: 1C-G, 1E-F) Passenger-side front air mix actuator | |
| Temperature control dial (passenger side): Moving towards HOT | 1.0 or less | |||||
| 1D | Seat warmer (LH) on/off | Seat warmer relay | Seat warmer switch off | B+ | Wiring harness: continuity, short circuit (Front climate control unit-seat warmer (LH) relay (relay block): 1D-A) Seat warmer (LH) relay | |
| Seat warmer switch on | 1.0 or less | |||||
| 1E | Motor operation | Passenger-side front air mix actuator | Temperature control dial (passenger side): Moving towards COLD | 1.0 or less | Wiring harness: continuity, short circuit (Front climate control unit-passenger-side front air mix actuator: 1C-G, 1E-F) Passenger-side front air mix actuator | |
| Temperature control dial (passenger side): Moving towards HOT | B+ | |||||
| 1F | Motor operation | Driver-side front air mix actuator | Temperature control dial (driver side): Moving towards COLD | B+ | Wiring harness: continuity, short circuit (Front climate control unit-driver-side front air mix actuator: 1A-G, 1F-F) Driver-side front air mix actuator | |
| Temperature control dial (driver-side): Moving towards HOT | 1.0 or less | |||||
| 1G | Motor operation | Rear air mix actuator | Temperature control dial (rear side): Moving towards COLD | B+ | Wiring harness: continuity, short circuit (Front climate control unit-Rear air mix actuator: 1G-F, 1I-G) Rear air mix actuator | |
| Temperature control dial (rear side): Moving towards HOT | 1.0 or less | |||||
| 1H | Motor operation | Front airflow mode actuator | Defroster switch on | 1.0 or less | Wiring harness: continuity, short circuit (Front climate control unit-front airflow mode actuator: 1H-G, 1J-F) Front airflow mode actuator | |
| Mode switch: Moving towards VENT | B+ | |||||
| 1I | Motor operation | Rear air mix actuator | Temperature control dial (rear side): Moving towards COLD | 1.0 or less | Wiring harness: continuity, short circuit (Front climate control unit-Rear air mix actuator: 1G-F, 1I-G) Rear air mix actuator | |
| Temperature control dial (rear side): Moving towards HOT | B+ | |||||
| 1J | Motor operation | Front airflow mode actuator | Defroster switch on | B+ | Wiring harness: continuity, short circuit (Front climate control unit-front airflow mode actuator: 1H-G, U-F) Front airflow mode actuator | |
| Mode switch: Moving towards VENT | 1.0 or less | |||||
| 1K | Seat warmer (RH) on/off | Seat warmer relay | Seat warmer switch off | B+ | Wiring harness: continuity, short circuit (Front climate control unit-seat warmer (RH) relay (main fuse block): 1K-A) Seat warmer (RH) relay | |
| Seat warmer switch on | 1.0 or less | |||||
| 1L | Motor operation | Rear airflow mode actuator | Temperature control dial (rear side): Moving towards HOT | B+ | Wiring harness: continuity, short circuit (Front climate control unit-Rear airflow mode actuator: 1L-G, 1N-F) Rear airflow mode actuator | |
| Temperature control dial (rear side): Moving towards COLD | 1.0 or less | |||||
| 1M | Motor operation | Air intake actuator | REC switch: Switched to RECIRCULATE | B+ | Wiring harness: continuity, short circuit (Front climate control unit-air intake actuator: 1M-A, 10-C) Air intake actuator | |
| REC switch: Switched to FRESH | 1.0 or less | |||||
| 1N | Motor operation | Rear airflow mode actuator | Temperature control dial (rear side): Moving towards HOT | 1.0 or less | Wiring harness: continuity, short circuit (Front climate control unit-Rear airflow mode actuator: 1L-G, 1N-F) Rear airflow mode actuator | |
| Temperature control dial (rear side): Moving towards COLD | B+ | |||||
| 1O | Motor operation | Air intake actuator | REC switch: Switched to RECIRCULATE | 1.0 or less | Wiring harness: continuity, short circuit (Front climate control unit-air intake actuator: 1M-A, 1O-C) Air intake actuator | |
| REC switch: Switched to FRESH | B+ | |||||
| 1P | Front blower motor feedback | Front power MOS FET | Airflow volume control dial | Off | Approx. 7.3 | Wiring harness: continuity, short circuit (Front climate control unit-front power MOS FET: 1P C, 1R A) Wiring harness: continuity (Front power MOS FET-body ground: D-ground) Front power MOS FET Front blower motor Front blower relay HEATER 50 A fuse |
| 1st. | Approx. 5.4 | |||||
| 2nd. | Approx. 4.6 | |||||
| 3rd. | Approx. 3.7 | |||||
| 4th. | Approx. 2.9 | |||||
| 5th. | Approx. 2.0 | |||||
| 6th. | Approx. 1.1 | |||||
| 7th | 1.0 or less | |||||
| 1Q | Rear window defroster switch | Rear window defroster relay | Rear window defroster switch on | 1.0 or less | Wiring harness: continuity, short circuit (Front climate control unit-rear window defroster relay (main fuse block): 1Q-A) Rear window defroster relay | |
| Rear window defroster switch off | B+ | Front climate control unit: terminal voltage (1W, 1X) | ||||
| 1R | Front blower fan speed control | Front power MOS FET | Airflow volume control dial | Off | 1.0 or less | Front climate control unit: terminal voltage (1P) |
| 1st. | Approx. 2.1 | |||||
| 2nd. | Approx. 2.2 | |||||
| 3rd. | Approx. 2.3 | |||||
| 4th. | Approx. 2.4 | |||||
| 5th. | Approx. 2.5 | |||||
| 6th. | Approx. 2.7 | |||||
| 7th. | Approx. 10.7 | |||||
| 1S | A/C | Refrigerant pressure switch | Fan switch on, A/C switch on | 1.0 or less | Front climate control unit: terminal voltage (1W, 1X) | |
| Fan switch off | B+ | Wiring harness: continuity, short circuit (Front climate control unit-refrigerant pressure switch: 1S-B) (Refrigerant pressure switch-PCM: C-1B) Refrigerant pressure switch PCM: terminal voltage (1B) | ||||
| 1T | Rear blower motor feedback | Rear power MOS FET | Rear airflow volume control dial | Off | Approx. 8.5 | Wiring harness: continuity, short circuit (Front climate control unit-rear power MOS FET: 1T D, 1V C) Wiring harness: continuity (Rear power MOS FET-body ground: A-ground) Rear power MOS FET Rear blower motor Rear blower relay R.HEATER 40 A fuse |
| 1st. | Approx. 6.1 | |||||
| 2nd. | Approx. 4.8 | |||||
| 3rd. | Approx. 3.6 | |||||
| 4th. | Approx. 1.9 | |||||
| 5th. | 1.0 or less | |||||
| 1U | On-board diagnostic signal | Check connector | Check connector is shorted. | 1.0 or less | Wiring harness: continuity (Front climate control unit-check connector: 1U-A) | |
| Other | B+ | Wiring harness: short circuit (Front climate control unit-check connector: 1U-A) Front climate control unit: terminal voltage (1W, 1X) | ||||
| 1V | Rear blower fan speed control | Rear power MOS FET | Rear airflow volume control dial | Off | 1.0 or less | Front climate control unit: terminal voltage (1T) |
| 1st. | Approx. 2.1 | |||||
| 2nd. | Approx. 2.2 | |||||
| 3rd. | Approx. 2.2 | |||||
| 4th. | Approx. 2.3 | |||||
| 5th. | Approx. 2.4 | |||||
| 1W | IG2 | A/C 7.5 A fuse | Ignition switch is at ON position | B+ | Wiring harness: continuity, short circuit (Front climate control unit-fuse: 1W-A/C 7.5 A) A/C 7.5 A fuse | |
| Ignition switch is at LOCK position | 1.0 or less | |||||
| 1X | Ground | Body ground | Under any condition: Inspect for continuity to ground | 1.0 or less | Wiring harness: continuity (Front climate control unit-ground: 1X-ground) | |
| 2A | ECT sensor signal | Instrument cluster | Because this terminal is for communication, good/no good judgment by terminal voltage is not possible. | |||
| 2B | +5V | Driver-side front air mix actuator Passenger-side front air mix actuator Front airflow mode actuator Solar radiation sensor Rear air mix actuator Rear airflow mode actuator | Under any condition | 5.0 | Wiring harness: short circuit (Front climate control unit-driver-side front air mix actuator, passenger-side front air mix actuator, front airflow mode actuator, solar radiation sensor, rear air mix actuator, rear airflow mode actuator: 2B-A, A, A, C, A, A) Driver-side front air mix actuator Passenger-side front air mix actuator Front airflow mode actuator Solar radiation sensor Rear air mix actuator Rear airflow mode actuator | |
| 2C | Information display signal | Information display | Because this terminal is for communication, good/no good judgment by terminal voltage is not possible. | |||
| 2D | Potentiometer input | Rear airflow mode actuator | Temperature control dial (rear side): Moving towards COLD | Approx. 0.5 | Wiring harness: continuity, short circuit (Front climate control unit-rear airflow mode actuator: 2D-E) Rear airflow mode actuator Front climate control unit: terminal voltage (2B) | |
| Temperature control dial (rear side): Moving towards medium temperature | Approx. 2.4 | |||||
| Temperature control dial (rear side): Moving towards HOT | Approx. 4.3 | |||||
| 2E | Potentiometer input | Front airflow mode actuator | Mode switch: Moving towards VENT | Approx. 1.0 | Wiring harness: continuity, short circuit (Front climate control unit-front airflow mode actuator: 2E-E) Front airflow mode actuator Front climate control unit: terminal voltage (2B) | |
| Mode switch: Moving towards BI-LEVEL | Approx. 1.9 | |||||
| Mode switch: Moving towards HEAT | Approx. 2.5 | |||||
| Mode switch: Moving towards HEAT/DEF | Approx. 3.3 | |||||
| Defroster switch on | Approx. 4.0 | |||||
| 2F | Potentiometer input | Driver-side front air mix actuator | Temperature control dial (driver side): Set temperature at MAX COLD | 4.0 | Wiring harness: continuity, short circuit (Front climate control unit-driver-side front air mix actuator: 2F-E) Driver-side front air mix actuator Front climate control unit: terminal voltage (2B) | |
| Temperature control dial (driver side): Set temperature at MAX HOT | 1.0 | |||||
| 2G | Potentiometer input | Passenger-side front air mix actuator | Temperature control dial (passenger side): Set temperature at MAX COLD | 1.0 | Wiring harness: continuity, short circuit (Front climate control unit-passenger-side front air mix actuator: 2G-E) Passenger-side front air mix actuator Front climate control unit: terminal voltage (2B) | |
| Temperature control dial (passenger side): Set temperature at MAX HOT | 4.0 | |||||
| 2H | Front evaporator temperature sensor input | Front evaporator temperature sensor | Compared with temperature detected by front evaporator temperature sensor | See scheme 11 | Wiring harness: continuity (Front climate control unit--front evaporator temperature sensor: 2H-B, 2P-A) Wiring harness: short circuit (Front climate control unit-front evaporator temperature sensor: 2H-B) Front evaporator temperature sensor | |
| 21 | Ambient temperature sensor input | Ambient temperature sensor | Compared with temperature detected by ambient temperature sensor | See scheme 14 | Wiring harness: continuity (Front climate control unit-ambient temperature sensor: 21-B, 2P-A) Wiring harness: short circuit (Front climate control unit-ambient temperature sensor: 21-B) Ambient temperature sensor | |
| 2J | Rear evaporator temperature sensor input | Rear evaporator temperature sensor | Compared with temperature detected by rear evaporator temperature sensor | See scheme 18 | Wiring harness: continuity (Front climate control unit-rear evaporator temperature sensor: 2J-B, 2P-A) Wiring harness: short circuit (Front climate control unit-rear evaporator temperature sensor: 2J-B) Rear evaporator temperature sensor | |
| 2K | Cabin temperature sensor input | Cabin temperature sensor | Compared with temperature detected by cabin temperature sensor | (Scheme 50) | Wiring harness: continuity (Front climate control unit-cabin temperature sensor: 2K-B, 2P-A) Wiring harness: short circuit (Front climate control unit-cabin temperature sensor: 2K-B) Cabin temperature sensor | |
| 2L | ||||||
| 2M | Solar radiation sensor(LH) input | Solar radiation sensor | Natural sunlight shined directly on the solar radiation sensor | 4.0 | Wiring harness: continuity (Front climate control unit-solar radiation sensor: 2M-C, 2B-A) Front climate control unit: terminal voltage (2B) Solar radiation sensor | |
| Blocking light to solar radiation sensor | 1.0 or less | |||||
| 2N | Potentiometer input | Rear air mix actuator | Temperature control dial (rear side): Set temperature at MAX COLD | 1.3 | Wiring harness: continuity, short circuit (Front climate control unit-rear air mix actuator: 2N-E) Rear air mix actuator Front climate control unit: terminal voltage (2B) | |
| Temperature control dial (rear side): Set temperature at MAX HOT | 4.0 | |||||
| 2O | Solar radiation sensor (RH) input | Solar radiation sensor | Natural sunlight shined directly on the solar radiation sensor | 4.0 | Wiring harness: continuity (Front climate control unit-solar radiation sensor: 20-B, 2B-A) Front climate control unit: terminal voltage (2B) Solar radiation sensor | |
| Blocking light to solar radiation sensor | 1.0 or less | |||||
| 2P | Sensor ground | Driver-side front air mix actuator Passenger-side front air mix actuator Front airflow mode actuator Ambient temperature sensor Cabin temperature sensor Front evaporator temperature sensor Rear air mix actuator Rear airflow mode actuator Rear evaporator temperature sensor | Under any condition: Inspect for continuity to ground | 1.0 or less | Front climate control unit: terminal voltage (1X) | |
| 3A | ||||||
| 3B | ||||||
| 3C | Rear climate control unit display | Rear climate control unit | Rear control switch on | B+ | Wiring harness: continuity (Front climate control unit-rear climate control unit: 3C-F) | |
| Rear control switch off | 1.0 or less | Wiring harness: short circuit (Front climate control unit-rear climate control unit: 3C-F) Front climate control unit: terminal voltage (1W, 1X) | ||||
| 3D | TNS signal | TNS relay | Turn the headlight switch to the off position | 1.0 or less | Wiring harness: short circuit (Front climate control unit-TNS relay (main fuse block): 3D-D) ILLUMI 10 A fuse TNS relay Headlight switch | |
| Turn the headlight switch to the TNS position | B+ | Wiring harness: continuity, short circuit (Front climate control unit-TNS relay (main fuse block): 3D-D) ILLUMI 10 A fuse TNS relay Headlight switch | ||||
| 3E | Rear fan control volume | Rear climate control unit | Airflow volume control dial | Off | 1.0 or less | Front climate control unit: terminal voltage (1T) Wiring harness: continuity, short circuit (Front climate control unit-rear climate control unit: 3E-A) Rear climate control unit |
| 1st. | Approx. 1.3 | |||||
| Max HI | Approx. 4.0 | |||||
| 3F | TNS signal | Rear climate control unit | Turn the headlight switch to the off position | 1.0 or less | Wiring harness: continuity, short circuit (Front climate control unit-rear climate control unit: 3F-H) TNS relay Headlight switch | |
| Turn the headlight switch to the TNS position | B+ | |||||
| 3G | Rear temperature control volume | Rear climate control unit | Temperature control dial (rear side): Moving towards COLD | 1.0 or less | Wiring harness: continuity, short circuit (Front climate control unit-rear airflow mode actuator: 3G-C) Rear climate control unit Front climate control unit: terminal voltage (2B) | |
| Temperature control dial (rear side): Moving towards medium temperature | Approx. 2.5 | |||||
| Temperature control dial (rear side): Moving towards HOT | Approx. 4.2 | |||||
| 3H | +5 V | Rear climate control unit | Under any condition | 5.0 | Wiring harness: continuity (Front climate control unit-ground: 3H-ground) | |
| 3I | Ground | Rear climate control unit | Under any condition: Inspect for continuity to ground | 1.0 or less | Wiring harness: continuity (Front climate control unit-rear climate control unit: 31-E) | |
| 3J | Panel light control input | Instrument cluster | Turn the headlight switch to the off position | 1.0 or less | Wiring harness: continuity, short circuit (Front climate control unit-instrument cluster: 3J-1I) TNS relay Headlight switch | |
| Turn the headlight switch to the TNS position | B+ | |||||
TERMINAL VOLTAGE REFERENCE
Scheme 50
Scheme 51
- Disconnect the negative battery cable.
- Remove the console cover. See «CONSOLE COVER REMOVAL/INSTALLATION»(ref-345331-S33051633072009102000000) .
- Remove the rear cooler duct. See «REAR COOLER DUCT REMOVAL/INSTALLATION»(ref-345376-S20752728562009102000000) .
- Remove the screws.
- Remove the rear climate control unit.
- Install in the reverse order of removal.
REAR CLIMATE CONTROL UNIT INSPECTION
- Connect the rear climate control unit connector.
- Turn the ignition switch to the ON position.
- Connect the negative (-) lead of the tester to body ground.
- By inserting the positive (+) lead of the tester into each rear climate control unit terminal, measure the voltage according to the terminal voltage table. If there is any malfunction, inspect the parts under "Inspection item (s)". If the parts under "Inspection item (s)" are found to be normal, replace the rear climate control unit.
Scheme 52
| Terminal | Signal name | Connected to | Measurement condition | Voltage (V) | Inspection item (s) | |
|---|---|---|---|---|---|---|
| A | Rear fan control volume | Front climate control unit | Airflow volume control dial | Off | 1.0 or less | Front climate control unit: terminal voltage (1T) Wiring harness: continuity, short circuit (Front climate control unit-rear climate control unit: 3E-A) Rear climate control unit |
| 1st. | Approx. 1.3 | |||||
| Max HI | Approx. 4.0 | |||||
| B | ||||||
| C | Rear temperature control volume | Front climate control unit | Temperature control dial: Moving towards COLD | 1.0 or less | Wiring harness: continuity, short circuit (Front climate control unit-rear airflow mode actuator: 3G-C) Rear climate control unit Front climate control unit: terminal voltage (2B) | |
| Temperature control dial: Moving towards medium temperature | Approx. 2.5 | |||||
| Temperature control dial: Moving towards HOT | Approx. 4.2 | |||||
| D | +5V | Front climate control unit | Under any condition | 5.0 | Front climate control unit: terminal voltage (3H) Wiring harness: continuity (Front climate control unit-rear climate control unit: 3H-D) | |
| E | Ground | Front climate control unit | Under any condition: Inspect for continuity to ground | 1.0 or less | Wiring harness: continuity (Front climate control unit-rear climate control unit: 31-E) | |
| F | Rear climate control unit display | Front climate control unit | Rear control switch on | B+ | Wiring harness: continuity (Front climate control unit-rear climate control unit: 3C-F) | |
| Rear control switch off | 1.0 or less | Wiring harness: short circuit (Front climate control unit-rear climate control unit: 3C-F) Front climate control unit: terminal voltage (1W, 1X) | ||||
| G | Panel light control input | Instrument cluster | Turn the headlight switch to the off position | 1.0 or less | Wiring harness: continuity, short circuit (Rear climate control unit-instrument cluster: G-1I) TNS relay Headlight switch | |
| Turn the headlight switch to the TNS position | B+ | |||||
| H | TNS signal | Front climate control unit | Turn the headlight switch to the off position | 1.0 or less | Wiring harness: continuity, short circuit (Front climate control unit-rear climate control unit: 3F-H) TNS relay Headlight switch | |
| Turn the headlight switch to the TNS position | B+ | |||||
| I | ||||||
| J | ||||||
TERMINAL VOLTAGE REFERENCE