DESCRIPTION
The cooler thermistor is installed in the instrument panel to detect the cabin temperature which is used to control the heater and air conditioning system AUTO mode. The resistance of the cooler thermistor changes in accordance with the cabin temperature. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.
The air conditioning amplifier assembly applies a voltage (5 V) to the cooler thermistor and reads voltage changes due to changes in the resistance of the cooler thermistor.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1411/11 | Open or short in cooler thermistor circuit | Cooler thermistor Harness or connector Air conditioning amplifier assembly |
Scheme 210
The thermistor assembly is installed in front of the condenser to detect the ambient temperature which is used to control the air conditioning system AUTO mode. This sensor is connected to the air conditioning amplifier assembly and detects fluctuations in the ambient temperature. This data is used for controlling the cabin temperature. The sensor sends a signal to the air conditioning amplifier assembly. The resistance of the thermistor assembly changes in accordance with the ambient temperature. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.
The air conditioning amplifier assembly applies a voltage (5 V) to the thermistor assembly and reads voltage changes due to changes in the resistance of the thermistor assembly.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1412/12 | Open or short in thermistor assembly circuit | Thermistor assembly Harness or connector Air conditioning amplifier assembly |
Scheme 211
The No. 1 cooler thermistor is installed on the evaporator in the air conditioner unit to detect the temperature of the air that has passed through the evaporator and is used to control the air conditioning. It sends signals to the air conditioning amplifier assembly. The resistance of the No. 1 cooler thermistor changes in accordance with the cooled air temperature that has passed through the evaporator. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.
The air conditioning amplifier assembly applies voltage (5 V) to the No. 1 cooler thermistor and reads voltage changes as the resistance of the No. 1 cooler thermistor changes. This sensor is used for frost prevention.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1413/13 | Open or short in No. 1 cooler thermistor circuit | No. 1 cooler thermistor Air conditioning harness assembly Air conditioning amplifier assembly |
Scheme 212
The smog ventilation sensor is installed to the front of the cooler condenser assembly and is used to control automatic switching between recirculation and fresh air modes. The smog ventilation sensor detects components of the exhaust gas (CO, HC) and transmits a signal to the air conditioning amplifier assembly.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1418/18 | Short in smog ventilation sensor circuit (HC, CO) | Smog ventilation sensor Harness or connector Air conditioning amplifier assembly |
Scheme 213
This DTC is stored if refrigerant pressure on the high pressure side is extremely low (196 kPa [2.0 kgf/cm 2 , 28 psi] or less) or extremely high (3138 kPa [32 kgf/cm 2 , 455 psi] or more). The air conditioner pressure sensor, which is installed on the pipe on the high pressure side to detect refrigerant pressure, sends a refrigerant pressure signal to the air conditioning amplifier assembly. The air conditioning amplifier assembly converts this signal to a pressure value according to the sensor characteristics and uses it to control the compressor.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1423/23 | Open or short in air conditioner pressure sensor circuit Refrigerant pressure on the high pressure side is extremely low (196 kPa [2.0 kgf/cm 2 , 28 psi) or less] or extremely high (3138 kPa [32 kgf/cm 2 , 455 psi] or more). | Air conditioner pressure sensor Harness or connector Air conditioning amplifier assembly Cooler expansion valve (blocked, stuck) Cooler dryer (moisture in the refrigerant cycle cannot be absorbed) Cooler condenser assembly (blocked, deterioration of cooling capacity due to dirt) Cooling fan system (condenser assembly cannot be cooled down) Refrigerant |
Scheme 214
The No. 2 air conditioning radiator damper servo sub-assembly (front passenger side upper air mix) sends pulse signals to indicate the damper position to the air conditioning amplifier assembly. The air conditioning amplifier assembly activates the motor (normal or reverse) based on these signals to move the No. 2 air conditioning radiator damper servo sub-assembly (front passenger side upper air mix) to the appropriate position. This adjusts the amount of air passing through the heater core after passing the evaporator and controls the temperature of the output air.
The air conditioning amplifier assembly communicates with the servo through a communication/driver IC and wiring assembly called the air conditioning harness assembly.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1441/41 | Air mix damper position sensor value does not change even if air conditioning amplifier assembly operates No. 2 air conditioning radiator damper servo sub-assembly (front passenger side upper air mix) | No. 2 air conditioning radiator damper servo sub-assembly (front passenger side upper air mix) Air conditioning harness assembly Air conditioning amplifier assembly |
Scheme 215
The No. 1 blower damper servo sub-assembly sends pulse signals to inform the air conditioning amplifier assembly of the damper position. The air conditioning amplifier assembly activates the motor (normal, reverse) based on the signals to move the air inlet mode selection No. 1 blower damper servo sub-assembly to any position, which controls the intake air settings (FRESH, FRESH/RECIRCULATION, and RECIRCULATION).
The air conditioning amplifier assembly communicates with the servo through a communication/driver IC and wiring assembly called the air conditioning harness assembly.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1442/42 | Air inlet damper position sensor value does not change even if air conditioning amplifier assembly operates No. 1 blower damper servo sub-assembly | No. 1 blower damper servo sub-assembly Air conditioning harness assembly Air conditioning amplifier assembly |
Scheme 216
The No. 6 air conditioning radiator damper servo sub-assembly sends pulse signals to inform the air conditioning amplifier assembly of the damper position. The air conditioning amplifier assembly activates the motor (normal, reverse) based on the signals to move the No. 6 air conditioning radiator damper servo sub-assembly to any position, which controls the air outlet switching.
The air conditioning amplifier assembly communicates with the servo through a communication/driver IC and wiring assembly called the air conditioning harness assembly.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1443/43 | Air outlet damper position sensor value does not change even if air conditioning amplifier assembly operates No. 6 air conditioning radiator damper servo sub-assembly | No. 6 air conditioning radiator damper servo sub-assembly Air conditioning harness assembly Air conditioning amplifier assembly |
Scheme 217
The No. 2 air conditioning radiator damper servo sub-assembly (driver side upper air mix) sends pulse signals to inform the air conditioning amplifier assembly of the damper position. The air conditioning amplifier assembly activates the motor (normal or reverse) based on the signals to move the No. 2 air conditioning radiator damper servo sub-assembly (driver side upper air mix) to any position. As a result, the amount of air passing through the heater core after passing through the evaporator is adjusted, and the temperature of the air blowing toward the driver seat side is controlled.
The air conditioning amplifier assembly communicates with the servo through a communication/driver IC and wiring assembly called the air conditioning harness assembly.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1446/46 | Air mix damper position sensor value does not change even if air conditioning amplifier assembly operates No. 2 air conditioning radiator damper servo sub-assembly (driver side upper air mix) | No. 2 air conditioning radiator damper servo sub-assembly (driver side upper air mix) Air conditioning harness assembly Air conditioning amplifier assembly |
Scheme 218
The No. 3 air conditioning damper servo sub-assembly (rear side air mix) sends pulse signals to indicate the damper position to the air conditioning amplifier assembly. The air conditioning amplifier assembly activates the motor (normal or reverse) based on these signals to move the No. 3 air conditioning damper servo sub-assembly (rear side air mix) to the appropriate position. This adjusts the amount of air passing through the heater core after passing the evaporator and controls the temperature of the output air.
The air conditioning amplifier assembly communicates with the servo through a communication/driver IC and wiring assembly called the air conditioning harness assembly.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1447/47 | Air mix damper position sensor value does not change even if air conditioning amplifier assembly operates No. 3 air conditioning damper servo sub-assembly (rear side air mix) | No. 3 air conditioning damper servo sub-assembly (rear side air mix) Air conditioning harness assembly Air conditioning amplifier assembly |
Scheme 219
The No. 5 air conditioning radiator damper servo sub-assembly sends pulse signals to indicate the damper position to the air conditioning amplifier assembly. The air conditioning amplifier assembly activates the motor (normal or reverse) based on these signals to move the No. 5 air conditioning radiator damper servo sub-assembly to any position, which controls the air outlet switching.
The air conditioning amplifier assembly communicates with the servo through a communication/driver IC and wiring assembly called the air conditioning harness assembly.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1448/48 | Front passenger side air mix damper position does not change even if air conditioning amplifier assembly operates No. 5 air conditioning radiator damper servo sub-assembly | No. 5 air conditioning radiator damper servo sub-assembly Air conditioning harness assembly Air conditioning amplifier assembly |
Scheme 220
The No. 7 air conditioning radiator damper servo sub-assembly sends pulse signals to inform the air conditioning amplifier assembly of the damper position. The air conditioning amplifier assembly activates the motor (normal, reverse) based on the signals to move the No. 7 air conditioning radiator damper servo sub-assembly to any position, which controls the air outlet switching.
The air conditioning amplifier assembly communicates with the servo through a communication/driver IC and wiring assembly called the air conditioning harness assembly.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1449/49 | Air outlet damper position sensor value does not change even if air conditioning amplifier assembly operates No. 7 air conditioning radiator damper servo sub-assembly | No. 7 air conditioning radiator damper servo sub-assembly Air conditioning harness assembly Air conditioning amplifier assembly |
Scheme 221
The No. 4 air conditioning radiator damper servo sub-assembly (driver side lower air mix) sends pulse signals to inform the air conditioning amplifier assembly of the damper position. The air conditioning amplifier assembly activates the motor (normal or reverse) based on the signals to move the No. 4 air conditioning radiator damper servo sub-assembly (driver side lower air mix) to any position. As a result, the amount of air passing through the heater core after passing through the evaporator is adjusted, and the temperature of the air blowing toward the driver side lower is controlled.
The air conditioning amplifier assembly communicates with the servo through a communication/driver IC and wiring assembly called the air conditioning harness assembly.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1453/53 | Air mix damper position sensor value does not change even if air conditioning amplifier assembly operates No. 4 air conditioning radiator damper servo sub-assembly (driver side lower air mix) | No. 4 air conditioning radiator damper servo sub-assembly (driver side lower air mix) Air conditioning harness assembly Air conditioning amplifier assembly |
Scheme 222
The No. 3 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) sends pulse signals to indicate the damper position to the air conditioning amplifier assembly. The air conditioning amplifier assembly activates the motor (normal or reverse) based on these signals to move the No. 3 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) to any position. As a result, the amount of air passing through the heater core after passing through the evaporator is adjusted, and the temperature of the air blowing toward the front passenger side lower is controlled.
The air conditioning amplifier assembly communicates with the servo through a communication/driver IC and wiring assembly called the air conditioning harness assembly.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1454/54 | Air mix damper position does not change even if air conditioning amplifier assembly operates No. 3 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) | No. 3 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) Air conditioning harness assembly Air conditioning amplifier assembly |
Scheme 223
The No. 1 air conditioning radiator damper servo sub-assembly sends pulse signals to inform the air conditioning amplifier assembly of the damper position. The air conditioning amplifier assembly activates the motor (normal, reverse) based on the signals to move the No. 1 air conditioning radiator damper servo sub-assembly to any position, which controls the air outlet switching.
The air conditioning amplifier assembly communicates with the servo through a communication/driver IC and wiring assembly called the air conditioning harness assembly.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1455/55 | Air outlet damper position sensor value does not change even if air conditioning amplifier assembly operates No. 1 air conditioning radiator damper servo sub-assembly | No. 1 air conditioning radiator damper servo sub-assembly Air conditioning harness assembly Air conditioning amplifier assembly |
Scheme 224
The smog ventilation sensor is installed to the front of the cooler condenser assembly and is used to control automatic switching between recirculation and fresh air modes. The smog ventilation sensor detects components of the exhaust gas (NOx) and transmits a signal to the air conditioning amplifier assembly.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1461/61 | Short in smog ventilation sensor circuit (NOx) | Smog ventilation sensor Harness or connector Air conditioning amplifier assembly |
Scheme 225
The compressor with motor assembly monitors the voltage of the HV battery. It stops compressor control and stores the DTC when the monitored voltage is outside the specified range.
The DTC will be stored as a history DTC. Compressor control may not resume unless the power switch is turned off.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1471/71 | Open or short in compressor with motor assembly high voltage power resource system. The boost inverter is broken or malfunctioning. | CAN communication system Hybrid control system High voltage fuse Air conditioning harness Compressor with motor assembly |
Scheme 226
The inverter in the compressor with motor assembly outputs high voltage to operate the motor. If there is an open or short in the output circuit, the ECU will stop compressor operation and store the DTC. The DTC will be stored as a history DTC. The compressor operation remains stopped until both the history and current DTCs are cleared.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1472/72 | Open or short in compressor with motor assembly high voltage output system. | Compressor with motor assembly CAN communication system |
The inverter activation signal is sent to the compressor with motor assembly from the power management control ECU. Compressor control is stopped and the DTC is stored if there is an open or short in the signal circuit.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1473/73 | Open or short in compressor with motor assembly start-up signal system. | CAN communication system Hybrid control system Harness or connector Compressor with motor assembly Power management control ECU |
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1474/74 | Compressor with motor assembly malfunction | Compressor with motor assembly CAN communication system |
The temperature sensor of the compressor with motor assembly detects its inverter temperature.
If the temperature exceeds the maximum, the operation of the compressor with motor assembly will be stopped, and DTC B1475/75 will be stored.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1475/75 | Temperature of the inverter is outside the specified range (temperature is too high), or there is an open or short to ground in the temperature sensor circuit. | Cooling fan system Refrigerant volume Compressor with motor assembly CAN communication system |
The operation of the compressor with motor assembly is stopped and a DTC B1476/76 is stored if the rotation load is too large or too small while the compressor with motor assembly is operating.
Possible causes are refrigerant leaks, overcharged refrigerant, insufficient cooling because of a condenser fan circuit malfunction, or compressor lock.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1476/76 | Motor rotation load while the compressor is operating is too large or too small. | Cooling fan system Refrigerant volume Compressor with motor assembly CAN communication system |
The compressor with motor assembly monitors the control power voltage in the circuit. It stops the compressor circuit and stores the DTC B1477/77 when the monitored voltage is outside the specified range.
This DTC will be stored as a history DTC. Compressor control may not resume unless the power switch is turned off.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1477/77 | An open or short to ground in the inverter control power voltage circuit. | Compressor with motor assembly CAN communication system |
The air conditioning harness assembly connects the air conditioning amplifier assembly and the servo motors. The air conditioning amplifier assembly supplies power and sends operation instructions to each servo motor through the air conditioning harness assembly. Each servo motor sends damper position information to the air conditioning amplifier assembly.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1497/97 | Error or open in communication line | Air conditioning harness assembly No. 1 air conditioning radiator damper servo sub-assembly No. 2 air conditioning radiator damper servo sub-assembly (driver side upper air mix) No. 2 air conditioning radiator damper servo sub-assembly (front passenger side upper air mix) No. 3 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) No. 4 air conditioning radiator damper servo sub-assembly (driver side lower air mix) No. 5 air conditioning radiator damper servo sub-assembly No. 6 air conditioning radiator damper servo sub-assembly No. 7 air conditioning radiator damper servo sub-assembly No. 1 blower damper servo sub-assembly No. 3 air conditioning radiator damper servo sub-assembly (rear air mix) Air conditioning amplifier assembly |
Scheme 227
The power management control ECU and compressor with motor assembly transmit information to one another via a communication line. Compressor control is stopped and the DTC is stored if communication information is cut off or abnormal information occurs.
The DTC B1498/98 is also detected if high voltage power supplied from the inverter with converter assembly to the compressor control circuit is shut off.
This DTC will be stored as a history DTC.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1498/98 | Communication line error or open between the power management control ECU and compressor with motor assembly. High voltage power source is shut off. | CAN communication system Hybrid control system High voltage fuse Air conditioning harness Harness or connector Compressor with motor assembly Power management control ECU |
The automatic light control sensor is installed on the upper side of the instrument panel. It detects sunlight to control air conditioning AUTO mode. The output voltage from the automatic light control sensor varies in accordance with the amount of sunlight. When the sunlight increases, the output voltage increases. As the sunlight decreases, the output voltage decreases. The air conditioning amplifier assembly detects changes in the output voltage from the automatic light control sensor.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| B14A3 | Short in passenger side automatic light control sensor circuit | Automatic light control sensor Harness or connector Main body ECU (multiplex network body ECU) Air conditioning amplifier assembly |
Scheme 228
The air conditioner thermistor assembly is installed to the glass window and detects the temperature of the glass window for use in the heater and air conditioner "AUTO" operation. The resistance of the air conditioner thermistor assembly changes according to changes in the temperature of the glass window. When the temperature of the glass window decreases, the resistance increases, and when the temperature of the glass window increases, the resistance decreases. The air conditioning amplifier assembly supplies voltage (5 V) to the air conditioner thermistor assembly and monitors the changes in voltage that result from the changes in the resistance of the air conditioner thermistor assembly.
The glass temperature sensor is integrated with the air conditioning thermistor assembly.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| B14A8 | Open or short in glass temperature sensor circuit | Air conditioning thermistor assembly Harness or connector Air conditioning amplifier assembly |
Scheme 229
The air conditioner thermistor assembly is installed to the glass window and detects the temperature near the glass window for use in the heater and air conditioner "AUTO" operation. The resistance of the air conditioner thermistor assembly changes according to changes in the temperature near the glass window. When the temperature near the glass window decreases, the resistance increases, and when the temperature near the glass window increases, the resistance decreases. The air conditioning amplifier assembly supplies voltage (5 V) to the air conditioner thermistor assembly and monitors the changes in voltage that result from the changes in the resistance of the air conditioner thermistor assembly.
The glass surroundings temperature sensor is integrated with the air conditioning thermistor assembly.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| B14A9 | Open or short in air conditioner thermistor assembly circuit | Air conditioning thermistor assembly Harness or connector Air conditioning amplifier assembly |
Scheme 230
The air conditioner thermistor assembly is installed to the glass window and detects the humidity in the cabin for use in the heater and air conditioner "AUTO" operation. The voltage of the air conditioner thermistor assembly changes according to changes in the humidity in the cabin. The air conditioning amplifier assembly monitors changes in the voltage.
The glass humidity sensor is integrated with the air conditioning thermistor assembly.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| B14AA | Open or short in glass humidity sensor circuit | Air conditioning thermistor assembly Harness or connector Air conditioning amplifier assembly |
Scheme 231
The rear control switch communicates with the air conditioning amplifier assembly through the LIN communication system.
If the LIN communication system malfunctions, the air conditioning amplifier assembly does not operate even if the rear control switch is operated.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| B14B3 | Lost communication with the rear control switch. | Rear control switch Air conditioning amplifier assembly LIN communication system Harness or connector |
Scheme 232
SYSTEM DESCRIPTION
This DTC is stored if the amount of refrigerant in the air conditioning system is insufficient.
The air conditioning amplifier assembly receives the ambient temperature signal, refrigerant pressure signal etc. from various sensors.
Based on these signals, the air conditioning amplifier assembly detects the amount of refrigerant.
The A/C switch indicator is turned off and air conditioning system is stopped if the amount of refrigerant is insufficient in the cycle.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| B14B8 | When the following condition is detected using the refrigerant shortage check in normal operation: The amount of refrigerant is insufficient. | Refrigerant Refrigerant pipe line Cooler expansion valve Air conditioning amplifier assembly |
The DTC is stored if there is insulation trouble with the high voltage circuit in the air conditioning system. Possible causes are poor insulation in the compressor with motor assembly, or mixing of any oil other than ND-OIL 11 in the refrigerant cycle.
A high voltage motor is built into the electrical compressor and is cooled directly with refrigerant. Compressor oil (ND-OIL 11) with high insulation performance is used because a leakage of electrical power may occur if regular compressor oil (ND-OIL 8) is used.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0AA6-611 | High voltage system insulation malfunction | Refrigerant pipe line Compressor with motor assembly CAN communication system |
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| U0131 | No communication with power steering ECU assembly | CAN communication system Power steering ECU assembly Air conditioning amplifier assembly |
| U0142 | No communication with main body ECU (multiplex network body ECU) | CAN communication system Main body ECU (multiplex network body ECU) Air conditioning amplifier assembly |
| U0155 | No communication with combination meter assembly | CAN communication system Combination meter assembly Air conditioning amplifier assembly |
| U0163 | No communication with multi-media module receiver assembly | CAN communication system Multi-media module receiver assembly Air conditioning amplifier assembly |
| U0293 | No communication with power management control ECU | CAN communication system Power management control ECU Air conditioning amplifier assembly |
The blower with fan motor sub-assembly is operated by signals from the air conditioning amplifier assembly. Blower with fan motor sub-assembly speed signals are transmitted in accordance with changes in the duty ratio.
Scheme 233
The heater accessory assembly sends engine coolant to the heater core assembly while the engine is stopped to prevent heater effectiveness from becoming low. Directed by the air conditioning amplifier assembly, the hybrid vehicle control ECU operates the water pump relay and drives the heater accessory assembly.
Scheme 234
The air conditioning amplifier assembly sends operation signals to the PTC heater relays when quick heater assembly operation conditions are met. Based on the signals from the air conditioning amplifier assembly, the PTC heater relays turn on, and power is supplied to the quick heater assembly installed in the air conditioning radiator assembly.
| Control ECU | Condition |
|---|---|
| Air Conditioning Amplifier Assembly | Blower switch: Lo |
| Temperature set to HI | |
| ECO drive mode off | |
| Engine coolant temperature 64°C (147.2°F) or lower | |
| Ambient temperature 10°C (50.0°F) or lower | |
| IDH signal terminal: Below 1 V |
QUICK HEATER ASSEMBLY OPERATION CONDITION
HINT
- When all operation conditions are met, 2 quick heater assemblies are operated.
- The number of quick heater assemblies operated changes according to the engine coolant temperature.
Scheme 235
When the combination switch is turned to ECO position, the air conditioning amplifier assembly controls the air conditioning system to enhance fuel efficiency.
Scheme 236
The main power source is supplied to the air conditioning amplifier assembly when the power switch on (IG).
The power is used for operating the air conditioning amplifier assembly, servo motors, etc.
Scheme 237
The back-up power source circuit for the air conditioning amplifier assembly is shown below. Power is supplied even when the power switch is off. The power is used for diagnostic trouble code memory, etc.
Scheme 238
See also:
• DIAGNOSIS SYSTEM [03/2012 - ]
• REMOVAL [03/2012 - ]