Heater & Air Conditioning Control System (Automatic Air Conditioning): Overview Nissan Quest IV

STRUCTURE AND OPERATION

1. The refrigerant pressure sensor is a capacitance type sensor. It consists of a pressure detection areas and a signal processing area.
2. The pressure detection area, which is a variable capacity condenser, changes internal static capacitance according to pressure force.
3. The signal processing area detects the static capacitance of the pressure detection area, converts the static capacitance into a voltage value, and transmits the voltage value to ECM.

DESCRIPTION

Exhaust gas/outside odor detecting sensor detects ambient atmospheric CO, NO2 and unpleasant odor, and converts them to values of resistance. The values are converted to signals with the exhaust gas/outside odor detecting sensor internal circuit, then the A/C auto amp. inputs the signals.

Scheme 97

Exhaust gas/outside odor detecting sensor has a construction that detects CO, NO2 and unpleasant odor by exhaust gas/outside odor detecting sensor element from the air intake of the case through a filter (waterproof sheet). It sends output signals to the A/C auto amp. in response to a resistance value conversion by exhaust gas/outside odor detecting sensor elements. A/C auto amp. controls intake door motor to prevent a smell of exhaust gas and unpleasant ambient odor from getting into the vehicle by performing corrections according to various driving conditions.

Scheme 98

Compressor is driven by the magnet clutch which is magnetized by electric power supply.

Scheme 99

1. Magnet clutch consists of pulley, clutch disc, and field coil. Pulley is connected with crankshaft pulley of engine via drive belt and is always rotated while engine is running. Clutch disc is connected with drive shaft of compressor. Field coil, which becomes a strong electric magnet when electricity is supplied, strongly pulls clutch disc and pressed it to pulley.
2. When A/C relay integrated in IPDM E/R turns ON, electricity is supplied to field coil, clutch disc is pressed to pulley, and engine rotational movement is transmitted from crankshaft pulley ==> drive belt ==> pulley ==> clutch disc ==> drive shaft. Compressor is operated. When A/C relay turns OFF, electricity is not supplied to field coil, and clutch disc is released from pulley. Compressor is not operated.

1. Front automatic air conditioning system is controlled by each function of A/C auto amp., BCM, ECM and IPDM E/R.
2. Each operation of front air conditioning system can be controlled by front A/C control (built-in A/C auto amp.).

1. A/C auto amp. changes duty ratio of front blower motor control signal to control air flow continuously. When air flow is increased, duty ratio of front blower motor control signal gradually increases to prevent a sudden increase in air flow.
2. In addition to manual control and automatic control, air flow control is compose of starting air flow control, low coolant temperature starting control, high in-vehicle temperature starting control, and fan speed control at door motor operation.

Scheme 100

1. A/C auto amp. decides target air flow depending on target front air mix door opening angle.
2. A/C auto amp. changes duty ratio of front blower motor control signal to control air flow continuously so that air flow matches to target air flow.
3. When air outlet is VENT or B/L, the minimum air flow is changed depending on sunload.

FAN SPEED CONTROL AT DOOR MOTOR OPERATION

When front mode door motor is activated while air flow is more than the specified value, A/C auto amp. reduces temporarily fan speed so that front mode door moves smoothly.

1. When the compressor activation condition is satisfied while front blower motor is activated, A/C auto amp. transmits A/C ON signal and blower fan ON signal to BCM.
2. BCM transmits the A/C ON signal and blower fan ON signal to ECM via CAN communication line. Refer to " «SIGNAL BUFFER SYSTEM: SYSTEM DESCRIPTION»(ref-672646-S18444622092014112400000) ".
3. ECM judges the conditions of each sensor (refrigerant pressure sensor signal, accelerator position signal, etc.), and transmits the A/C compressor request signal to IPDM E/R via CAN communication line.
4. By receiving the A/C compressor request signal from ECM, IPDM E/R turns the A/C relay to ON, and activates the compressor. Refer to " «RELAY CONTROL SYSTEM: SYSTEM DESCRIPTION»(ref-672640-S30637697432014112400000) ".

1. Rear automatic air conditioning system is controlled by each function of A/C auto amp.
2. Each operation of rear automatic air conditioning system can be controlled by front A/C control (built-in A/C auto amp.) and rear A/C control.

1. A/C auto amp. changes duty ratio of rear blower motor control signal to control air flow continuously. When air flow is increased, duty ratio of rear blower motor control signal gradually increases to prevent a sudden increase in air flow.
2. In addition to manual control and automatic control, air flow control is compose of starting air flow control, low coolant temperature starting control, high in-vehicle temperature starting control, and fan speed control at door motor operation.

Scheme 101

1. A/C auto amp. decides target air flow depending on target air mix door opening angle.
2. A/C auto amp. changes duty ratio of rear blower motor control signal to control air flow continuously so that air flow matches to target air flow.
3. When air outlet is VENT or B/L, the minimum air flow is changed depending on sunload.

When rear mode door motor is activated while air flow is more than the specified value, A/C auto amp. reduces temporarily fan speed so that rear mode door moves smoothly.

Scheme 102

1. LCU (Local Control Unit) is built into each door motor. And detects door position by PBR (Potentio Balance Resistor).
2. A/C auto amp. communicates with each LCU via communication line. And receives each door position feedback signal from each LCU.
3. Each LCU controls each door to the appropriate position depending on the control signal from A/C auto amp.
4. Each LCU transmits the signal of door movement completion to A/C auto amp., when the door movement is completed.

Scheme 103

ACCS (advanced climate control system) controls passenger room air. It maintains the cleanliness of the passenger room air using a high performance filter and a combination of each of the following functions.

1. Automatic intake control (exhaust gas/outside odor detecting mechanism)
2. Plasmacluster™ ion NOTE: Plasmacluster™ ion technology developed by Sharp Corporation is installed in this item. Plasmacluster™ is a trademark of Sharp Corporation.

OPERATION AND DISPLAY OF FRONT AUTOMATIC AIR CONDITIONING SYSTEM [WITH ACCS (ADVANCED CLIMATE CONTROL SYSTEM)]

Display: Display in front A/C control

1. Front air conditioning operation status is indicated on display in front A/C control.
2. Front air conditioning status display screen is indicated when MODE switch is pressed while front air conditioning is OFF.

Note. "REAR" is indicated on display while rear air conditioning operation screen is indicated.

Operation: Front A/C control

Scheme 104

Note. The following switches are not necessary for front air conditioning system operation.

OPERATION AND DISPLAY OF FRONT AUTOMATIC AIR CONDITIONING SYSTEM [WITHOUT ACCS (ADVANCED CLIMATE CONTROL SYSTEM)]

Display: Display in front A/C control

1. Front air conditioning operation status is indicated on display in front A/C control.
2. Front air conditioning status display screen is indicated when MODE switch is pressed while front air conditioning is OFF.

Note. "REAR" is indicated on display while rear air conditioning operation screen is indicated.

Operation: Front A/C control

Scheme 105

Note. The following switches are not necessary for front air conditioning system operation.

OPERATION AND DISPLAY OF REAR AUTOMATIC AIR CONDITIONING SYSTEM

1. Rear air conditioning operation status is indicated on display in front A/C control and rear A/C control.
2. Rear air conditioning can be operated from front seat (front A/C control) and rear seat (rear A/C control).

Note. Rear air conditioning is operative only when front air conditioning is ON.

FRONT A/C CONTROL OPERATION [WITH ACCS (ADVANCED CLIMATE CONTROL SYSTEM)]

Display: Display in front A/C control

1. Rear air conditioning operation status is indicated on display in front A/C control.
2. Front A/C control changes to rear air conditioning operation screen when REAR switch is pressed while front air conditioning is ON. "REAR" is indicated on display in front A/C control display. The status continues for 10 seconds, and during this period of time, rear air conditioning setting can be set using front A/C control.
3. When 10 seconds are passed, front A/C control returns to front air conditioning operation screen and "REAR" on front A/C control display turns OFF. In this case, rear air conditioning setting can be set using rear A/C control.

Operation: Front A/C control

Scheme 106

Note. The following switches are not necessary for rear air conditioning system operation.

FRONT A/C CONTROL OPERATION [WITHOUT ACCS (ADVANCED CLIMATE CONTROL SYSTEM)]

Display: Display in front A/C control

1. Rear air conditioning operation status is indicated on display in front A/C control.
2. Front A/C control changes to rear air conditioning operation screen when REAR switch is pressed while front air conditioning is ON. "REAR" is indicated on display in front A/C control display. The status continues for 10 seconds, and during this period of time, rear air conditioning setting can be set using front A/C control.
3. When 10 seconds are passed, front A/C control returns to front air conditioning operation screen and "REAR" on front A/C control display turns OFF. In this case, rear air conditioning setting can be set using rear A/C control.

Operation: Front A/C control

Scheme 107

Note. The following switches are not necessary for rear air conditioning system operation.

REAR A/C CONTROL OPERATION

Display: Display in rear A/C control

Rear air conditioning operation status is indicated on display in rear A/C control.

Operation: Rear A/C control

Rear air conditioning becomes the following setting can be operated by rear A/C control in the following status.

Scheme 108

1. When front air conditioning is ON
2. When front A/C control displays front air conditioning operation screen ("REAR" is not indicated)

OPERATION AND DISPLAY OF ACCS (ADVANCED CLIMATE CONTROL SYSTEM)

Display: Display in front A/C control

Plasmacluster™ ion

Scheme 109

Scheme 110

1. Plasmacluster™ ion control state is indicated on display in front A/C control.
2. Plasmacluster™ ion control state is switched as shown in the figure below depending on air flow. When air flow is small When air flow is large

Automatic intake control (exhaust gas/outside odor detecting mechanism)

Scheme 111

1. When the AUTO intake switch is turned ON, ambient atmosphere status is indicated on the display in the front A/C control, while the exhaust gas/outside odor detecting sensor detects exhaust gas or unpleasant odor. NOTE: After the ignition switch is turned ON, warm up the exhaust gas/outside odor detecting sensor for approximately 40 seconds. When the AUTO intake switch is turned ON, the ambient atmosphere status is displayed continuously until sensor warm up is completed.

Operation: Front A/C control

Scheme 112

Note. The following switches are not necessary for ACCS (Advanced Climate Control System) operation.

Air conditioning system performs self-diagnosis, operation check, function diagnosis, and various settings using diagnosis function of each control unit.

Front A/C control (switch indicator and display) and rear A/C control (display) indication are checked.

Normal: All switch indicator and display indication are turned ON.

Malfunction: Malfunctioning part indicator is not turned ON.

When STEP 2 is selected, "2" is indicated on the display, and then self-diagnosis result is indicated.

Normal: "20" is displayed.

Malfunction: Corresponding code number displayed. (When short-circuit error, A/C switch indicator turns ON)

Note. Corresponding code Nos. indicates 1 second each if two or more sensors and door motors malfunction.

Scheme 113

"3" is indicated on the display, and then self-diagnosis result is indicated.

The check of door motor is performed by A/C auto amp. transmitting output signal to each door motor.

Normal: "30" is displayed.

Malfunction: Corresponding code number displayed.

Note. Corresponding code Nos. indicates 1 seconds each if two or more mode or intake door motors malfunction.

Scheme 114

When STEP 4 is selected, each part operation is started with indicating "41" on the display.

Each time DEF switch is pressed, the display will change to "41" --> "42" --> "43" --> "44" --> "45" --> "46" --> "41".

Operation Contents

Checks must be visually, by listening the sound or by touching air outlets with hand, etc. for improper operation.

FRONT AIR CONDITIONING DESCRIPTION

REAR AIR CONDITIONING DESCRIPTION

When STEP 5 is selected, "51" is indicated on the display.

Each time DEF switch is pressed, each sensor recognition temperature is changed in order of the following

"51" --> Ambient sensor recognition temperature --> Front in-vehicle sensor recognition temperature --> Intake sensor recognition temperature --> Rear in-vehicle sensor recognition temperature --> "51".

Note. When each sensor recognition temperature is negative temperature, A/C switch indicator turns ON. Each sensor recognition temperature is not displayed in less than -30°C (-22°F) or more than 55°C (131°F).

When STEP 5 is selected, "51" is indicated on the display.

When REC switch is pressed, "52" is indicated on the display.

Each time DEF switch is pressed, display is changed in order of the following

"52" --> Self-diagnosis result --> "51".

If the temperature felt by the customer is different from the air flow temperature (front/rear) controlled by the temperature setting, the A/C auto amp. control temperature (front/rear) can be adjusted to compensate for the temperature setting.

In FOOT mode, the air blowing to DEF can change ON/OFF.

1. Inlet port setting can be memorized when ignition switch is turned OFF.
2. Inlet port setting can be selected from FRE (fresh air intake), REC (recirculation), or "Do not perform the memory" when ignition switch is turned ON.

According to customer's sense of smell, exhaust gas/outside odor detecting sensor sensitivity can be changed.

Condition for interlocking movement of AUTO intake switch and A/C switch can be changed. In addition operation of the AUTO intake switch, which activates the automatic intake control (exhaust gas/outside odor detecting mechanism), can be set to become available when the A/C switch is ON.

The purpose of the operation inspection is to check that the individual system operates normally.

Check condition: Engine running at normal operating temperature.

OPERATION INSPECTION

1. CHECK MEMORY FUNCTION Press AUTO switch to activate front A/C system. Set temperature to 32.0°C by operating temperature control switch (driver side). Press ON.OFF switch. Turn ignition switch OFF. Turn ignition switch ON. Press AUTO switch. Check that the set temperature (32.0°C) is maintained. Is the inspection result normal? YES: GO TO 2. NO: GO TO 11 .
2. CHECK FRONT BLOWER MOTOR Start engine. Operate fan switch and check that fan speed changes. Check operation for all fan speeds. Is the inspection result normal? YES: GO TO 3. NO: GO TO 11 .
3. CHECK DISCHARGE AIR (MODE SWITCH AND DEF SWITCH) Operate fan switch to set the fan speed to maximum speed. Operate MODE switch and DEF switch. Check that air outlets change according to each indicated air outlet by placing a hand in front of the outlets. Refer to " «VENTILATION SYSTEM (FRONT AIR CONDITIONING): SYSTEM DESCRIPTION»(ref-672649-S14864063122014112400000) ". Is the inspection result normal? YES-1: With ACCS (Advanced Climate Control System): GO TO 4. YES-2: Without ACCS (Advanced Climate Control System): GO TO 5. NO: GO TO 11.
4. CHECK INTAKE AIR [WITH ACCS (ADVANCED CLIMATE CONTROL SYSTEM)] Press intake switch to set the air inlet to recirculation. The intake switch indicator turns ON. Listen to intake sound and confirm air inlets change. Press intake switch again to set the air inlet to fresh air intake. The intake switch indicator turns OFF. Listen to intake sound and confirm air inlets change. Is the inspection result normal? YES: GO TO 6 . NO: GO TO 11 .
5. CHECK INTAKE AIR [WITHOUT ACCS (ADVANCED CLIMATE CONTROL SYSTEM)] Press REC switch to set the air inlet to recirculation. The REC switch indicator turns ON. Listen to intake sound and confirm air inlets change. Press FRE switch again to set the air inlet to fresh air intake. The FRE switch indicator turns OFF. Listen to intake sound and confirm air inlets change. Is the inspection result normal? YES: GO TO 6. NO: GO TO 11 .
6. CHECK COMPRESSOR Press A/C switch. The A/C switch indicator is turns ON. Check visually and by sound that the compressor operates. Press A/C switch again. The A/C switch indicator is turns OFF. Check that compressor stops. Is the inspection result normal? YES: GO TO 7. NO: GO TO 11 .
7. CHECK DISCHARGE AIR TEMPERATURE Operate temperature control switch (driver side). Check that discharge air temperature (driver side) changes. Operate temperature control switch (passenger side). "DUAL" indicator on front A/C control display turns ON. Check that the discharge air temperature (passenger side) changes. Press DUAL switch. "DUAL" indicator turns OFF. Check that air temperature setting (LH/RH) is unified to the driver side temperature setting. Is the inspection result normal? YES: GO TO 8. NO: GO TO 11 .
8. CHECK WITH TEMPERATURE SETTING LOWERED Operate compressor. Operate temperature control switch (driver side) to lower the set temperature to 18°C. Check that cool air blows from the air outlets. Is the inspection result normal? YES: GO TO 9. NO: GO TO 11 .
9. CHECK TEMPERATURE INCREASE Warm up engine to the normal operating temperature. Operate temperature control switch (driver side) to raise the set temperature to 32°C. Check that warm air blows from the air outlets. Is the inspection result normal? YES: GO TO 10. NO: GO TO 11 .
10. CHECK AUTO MODE Press AUTO switch and check that "AUTO" indicator on front A/C control display turns ON. Operate temperature control switch (driver side) to check that fan speed or air outlet changes (the air outlet or fan speed varies depending on the ambient temperature, in-vehicle temperature (front side), set temperature, and etc.). Is the inspection result normal? YES: INSPECTION END NO: GO TO 11.
11. CHECK SELF-DIAGNOSIS USING ON BOARD DIAGNOSIS SYSTEM Perform self-diagnosis using on board diagnosis. Check whether any malfunction is detected. Is any malfunction detected? YES: Perform the appropriate diagnosis for the detected malfunction. NO: GO TO 12.
12. CHECK SELF-DIAGNOSTIC RESULT USING CONSULT Perform self-diagnosis using CONSULT. Check whether any DTC is detected. Is any DTC detected? YES: Perform the appropriate diagnosis for the detected DTC. NO: Refer to " «SYMPTOM TABLE»(ref-672615-S17619084602014112400000) ", and perform the appropriate diagnosis.

The purpose of the operational check is to check that the individual system operates normally.

Note. Check that front automatic air conditioning system operates normally. Refer to " FRONT AUTOMATIC AIR CONDITIONING SYSTEM: WORK PROCEDURE ".

Check condition: Engine running at normal operating temperature.

Front air conditioning system is in operation.

Front A/C control operation

1. CHECK REAR CONTROL MODE FUNCTION Press REAR switch. The REAR switch indicator turns ON. Check that front A/C control changes to the rear A/C control mode ("REAR" indicator on front A/C display turns ON) and that rear automatic air conditioning system starts. NOTE: "REAR" indicator on front A/C control display turns OFF when any switch is not operated for approximately 10 seconds. Press REAR switch again. The REAR switch indicator turns OFF. Check that "REAR" indicator on front A/C display turns OFF and rear control mode released. (Rear automatic air conditioning system operates continuously) Is the inspection result normal? YES: GO TO 2. NO: GO TO 8 .
2. CHECK REAR BLOWER MOTOR Press REAR switch and check that "REAR" indicator on front A/C display turns ON. NOTE: "REAR" indicator on front A/C control display turns OFF when any switch is not operated for approximately 10 seconds. Operate fan switch to check that fan speed changes. Check the operation for all fan speeds. Is the inspection result normal? YES: GO TO 3. NO: GO TO 8 .
3. CHECK DISCHARGE AIR Press REAR switch and check that "REAR" indicator on front A/C display turns ON. NOTE: "REAR" indicator on front A/C control display turns OFF when any switch is not operated for approximately 10 seconds. Operate fan switch to set the fan speed to maximum speed. Operate MODE switch. Check that air outlets change according to each indicated air outlet by placing a hand in front of the outlets. Refer to " «VENTILATION SYSTEM (REAR AIR CONDITIONING): SYSTEM DESCRIPTION»(ref-672649-S01049826262014112400000) ". Is the inspection result normal? YES: GO TO 4. NO: GO TO 8.
4. CHECK DISCHARGE AIR TEMPERATURE Press REAR switch and check that "REAR" indicator on front A/C display turns ON. NOTE: "REAR" indicator on front A/C control display turns OFF when any switch is not operated for approximately 10 seconds. Operate temperature control switch (driver side). Check that discharge air temperature changes. Is the inspection result normal? YES: GO TO 5. NO: GO TO 8 .
5. CHECK WITH TEMPERATURE SETTING LOWERED Press REAR switch and check that "REAR" indicator on front A/C display turns ON. NOTE: "REAR" indicator on front A/C control display turns OFF when any switch is not operated for approximately 10 seconds. Operate temperature control switch (driver side) to lower the set temperature to 18°C. Check that cool air blows from the air outlets. Is the inspection result normal? YES: GO TO 6. NO: GO TO 8 .
6. CHECK TEMPERATURE INCREASE Press REAR switch and check that "REAR" indicator on front A/C display turns ON. NOTE: "REAR" indicator on front A/C control display turns OFF when any switch is not operated for approximately 10 seconds. Operate temperature control switch (driver side) to raise the set temperature to 32°C. Check that warm air blows from the air outlets. Is the inspection result normal? YES: GO TO 7. NO: GO TO 8 .
7. CHECK AUTO MODE Press REAR switch and check that "REAR" indicator on front A/C display turns ON. NOTE: "REAR" indicator on front A/C control display turns OFF when any switch is not operated for approximately 10 seconds. Press AUTO switch and check that "AUTO" indicator on front A/C control display turns ON. Operate temperature control switch (driver side) to check that fan speed or air outlet changes (the air outlet or fan speed varies depending on the ambient temperature, in-vehicle temperature (rear side), set temperature, and etc.). Is the inspection result normal? YES: INSPECTION END NO: GO TO 8.
8. CHECK SELF-DIAGNOSIS USING ON BOARD DIAGNOSIS SYSTEM Perform self-diagnosis using on board diagnosis. Check whether any malfunction is detected. Is any malfunction detected? YES: Perform the appropriate diagnosis for the detected malfunction. NO: Refer to " «SYMPTOM TABLE»(ref-672615-S39205004162014112400000) ", and perform the appropriate diagnosis.

Rear A/C control operation

1. CHECK REAR BLOWER MOTOR Press AUTO switch and check that "AUTO" indicator on rear A/C control display turns ON. Operate fan switch to check that fan speed changes. Check operation for all fan speeds. Is the inspection result normal? YES: GO TO 2. NO: GO TO 7 .
2. CHECK DISCHARGE AIR Operate fan switch to set the fan speed to maximum speed. Operate MODE switch. Check that air outlets change according to each indicated air outlet by placing a hand in front of the outlets. Refer to " «VENTILATION SYSTEM (REAR AIR CONDITIONING): SYSTEM DESCRIPTION»(ref-672649-S01049826262014112400000) ". Is the inspection result normal? YES: GO TO 3. NO: GO TO 7.
3. CHECK DISCHARGE AIR TEMPERATURE Operate temperature control switch. Check that discharge air temperature changes. Is the inspection result normal? YES: GO TO 4. NO: GO TO 7 .
4. CHECK WITH TEMPERATURE SETTING LOWERED Operate temperature control switch to lower the set temperature to 18°C. Check that cool air blows from the air outlets. Is the inspection result normal? YES: GO TO 5. NO: GO TO 7 .
5. CHECK TEMPERATURE INCREASE Operate temperature control switch to raise the set temperature to 32°C. Check that warm air blows from the air outlets. Is the inspection result normal? YES: GO TO 6. NO: GO TO 7 .
6. CHECK AUTO MODE Press AUTO switch and check that "AUTO" indicator on rear A/C control display turns ON. Operate temperature control switch to check that fan speed or air outlet changes (the air outlet or fan speed varies depending on the ambient temperature, in-vehicle temperature (rear side), set temperature, and etc.). Is the inspection result normal? YES: INSPECTION END NO: GO TO 7.
7. CHECK SELF-DIAGNOSIS USING ON BOARD DIAGNOSIS SYSTEM Perform self-diagnosis using on board diagnosis. Check whether any malfunction is detected. Is any malfunction detected? YES: Perform the appropriate diagnosis for the detected malfunction. NO: Refer to " «SYMPTOM TABLE»(ref-672615-S39205004162014112400000) ", and perform the appropriate diagnosis.

The purpose of the operational check is to check that the individual system operates normally.

Note. Check that front automatic air conditioning system operates normally. Refer to " FRONT AUTOMATIC AIR CONDITIONING SYSTEM: WORK PROCEDURE ".

Check condition: Engine running

1. CHECK PLASMACLUSTER™ ION Check the ionizer operation sound (whirring sound) in the duct by putting an ear to the center ventilator grille (driver side) outlet while pressing fan switch and OFF switch alternately. Is the inspection result normal? YES: GO TO 2. NO: GO TO 4 .
2. CHECK PLASMACLUSTER™ ION OPERATION STATUS Operate fan switch and visually check that status indicator on front A/C control display changes in accordance with the following table. Fan speed Front A/C control display (ion indicator) 2nd CLEAN 5th QUICK CLEAN Is the inspection result normal? YES: GO TO 3. NO: GO TO 4 .
3. CHECK AUTOMATIC INTAKE CONTROL (EXHAUST GAS/OUTSIDE ODOR DETECTING MECHANISM) Press AUTO intake switch and check that AUTO intake switch indicator turns ON. Listen to intake sound to check that the air inlet changes to recirculation. Wait approximately for 5 minutes until air inlet switches to fresh air intake. Apply cigarette smoke or similar substance to exhaust gas/outside odor detecting sensor portion. Check that the status indicator on front A/C control display turns ON and listen to intake sound to check that air inlets change to recirculation. Is the inspection result normal? YES: INSPECTION END NO: GO TO 4.
4. CHECK SELF-DIAGNOSIS USING ON BOARD DIAGNOSIS SYSTEM Perform self-diagnosis using on board diagnosis. Check whether any malfunction is detected. Is any malfunction detected? YES: Perform the appropriate diagnosis for the detected malfunction. NO: Refer to " «SYMPTOM TABLE»(ref-672615-S16348336542014112400000) " and perform the appropriate diagnosis.

If the temperature felt by the customer is different from the front air flow temperature controlled by the temperature setting, the A/C auto amp. control temperature can be adjusted to compensate for the temperature setting.

If the temperature felt by the customer is different from the rear air flow temperature controlled by the temperature setting, the A/C auto amp. control temperature can be adjusted to compensate for the temperature setting.

In FOOT mode, the air blowing to DEF can be turned ON/OFF.

1. Air inlet is memorized when ignition switch is turned OFF, and the air inlet can be set either REC (recirculation), FRE (fresh air intake), or "Do not perform the memory" when ignition switch is turned ON again.
2. When "Do not perform the memory" is set, the air inlet is controlled automatically when ignition switch is turned ON again.

Sensitivity of exhaust gas/outside odor detecting sensor is adjustable for 2 steps of high and low. This function is used when sensitivity of sensor is different from customer's sense of smell.

Condition for interlocking movement of AUTO intake switch and A/C switch can be changed. It is possible to set the system not to receive switch operation of AUTO intake switch when A/C switch is OFF so that the advanced climate control system is not activated. It is also possible to set the system not to turn A/C switch ON when AUTO intake switch is pressed.

See also:
• COMPONENT FUNCTION CHECK