Air Conditioning System (diagnostics - Introduction) Toyota Prius C I

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1. PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE AUXILIARY BATTERY TERMINAL NOTE: When disconnecting the cable from the negative (-) auxiliary battery terminal, initialize the following system after the cable is reconnected. System Name See Procedure Power Door Lock Control System Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction__initialization)
2. IGNITION SWITCH EXPRESSIONS The type of ignition switch used on this model differs depending on the specifications of the vehicle. The expressions listed in the table below are used in this information. Expression Ignition Switch (Position) Power Switch (Condition) Ignition Switch off LOCK Off (Lock) Ignition Switch ACC ACC On (ACC) Ignition Switch ON (IG) ON (IG) On (IG) Ignition Switch ON (READY) ON (READY) On (Ready)
3. DO NOT HANDLE REFRIGERANT IN AN ENCLOSED AREA OR NEAR AN OPEN FLAME TEXT IN ILLUSTRATION *a Charging Cylinder
4. ALWAYS WEAR EYE PROTECTION
5. BE CAREFUL NOT TO GET LIQUID REFRIGERANT IN YOUR EYES OR ON YOUR SKIN If liquid refrigerant gets in your eyes or on your skin: Wash the area with lots of cold water. WARNING: Do not rub your eyes or skin. Apply clean petroleum jelly to the skin. Go immediately to a hospital or see a physician for professional treatment.
6. NEVER HEAT CONTAINER OR EXPOSE CONTAINER TO AN OPEN FLAME
7. BE CAREFUL NOT TO DROP CONTAINER OR APPLY PHYSICAL SHOCKS TO IT
8. DO NOT OPERATE COMPRESSOR WITHOUT ENOUGH REFRIGERANT IN REFRIGERANT SYSTEM If there is not enough refrigerant in the A/C system, oil lubrication will be insufficient and the compressor may be damaged. Necessary care should be taken to avoid this.
9. DO NOT OPEN HIGH PRESSURE MANIFOLD VALVE WHILE COMPRESSOR IS OPERATING Open and close only the low pressure valve. If the high pressure valve is opened, refrigerant flows in the reverse direction causing the charging cylinder to rupture. TEXT IN ILLUSTRATION *a Wrong *b Okay
10. BE CAREFUL NOT TO OVERCHARGE SYSTEM WITH REFRIGERANT If the system is overcharged with refrigerant, it causes problems such as insufficient cooling, poor fuel economy, engine overheating, etc.
11. DO NOT OPERATE COMPRESSOR WITH NO REFRIGERANT WARNING: Doing so may damage the inside of the compressor because the compressor parts always move regardless of whether the A/C system is turned on or off.
12. PRECAUTIONS TO BE OBSERVED WHILE SERVICING WARNING: Always use insulated gloves and remove the service plug grip before beginning inspection, as inspection of the A/C system requires disconnecting high voltage connectors. NOTE: Only use ND-OIL 11 for the electric inverter compressor of the air conditioning system. Using other compressor oils may be dangerous, as they may conduct electricity. Electrical insulation performance may decrease significantly if even a small amount of oil other than ND-OIL 11 is used (or enters) in the refrigeration cycle, causing a DTC to be output. If other oil is accidentally used and a DTC is output, collect as much oil in the refrigerant cycle into the compressor as possible and replace it with ND-OIL 11 to increase the ND-OIL 11 ratio amount. Replace the main components (evaporator, condenser, and compressor) if a large amount of oil other than ND-OIL 11 enters the system. Failing to do so may cause electrical insulation performance to remain low, causing a DTC to be output.
13. SUPPLEMENTAL RESTRAINT SYSTEM (SRS) This vehicle is equipped with a Supplemental Restraint System (SRS) such as the driver, front passenger, side, and curtain shield airbags. Failure to carry out service operations in the correct sequence could cause the SRS to unexpectedly deploy during servicing, possibly leading to a serious accident. Before servicing (including removal or installation of parts, inspection or replacement), be sure to read the precautionary notices. Refer to «PRECAUTION»(/toyota/prius-c/i-2011-2015/remont/airbag/#supplemental-restraint-system-diagnostics-introduction__precaution) .
14. GENERAL PRECAUTION While using the auxiliary battery during inspection, do not bring the positive (+) and negative (-) tester probes too close to each other as a short circuit may occur.

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COMMUNICATION TABLE

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1. GENERAL The air conditioning system has the following controls. Control Outline Neural Network Control This control is capable of performing complex control by artificially simulating the information processing method of the nervous system of living organisms in order to establish a complex input/output relationship similar to that of a human brain. Outlet Air Temperature Control Based on the temperature set by the temperature control dial, neural network control calculates outlet air temperature based on input signals from various sensors. Blower Control Controls the blower motor with fan sub-assembly in accordance with the airflow volume that has been calculated by neural network control based on the input signals from various sensors. Air Outlet Control Automatically switches the air outlets in accordance with the outlet mode that has been calculated by neural network control. In accordance with the engine coolant temperature, ambient air temperature, amount of sunlight, required blower, outlet temperature and vehicle speed conditions, this control automatically switches the blower outlet to foot and defroster mode to prevent the windows from becoming fogged up when the ambient air temperature is low. Air Inlet Control Automatically controls the air inlet control damper to help achieve the calculated outlet air temperature that is required. Drives the air inlet control servo motor according to the operation of the air inlet control switch and moves the dampers to the fresh or recirculation position. Electric Inverter Compressor Control The air conditioning amplifier assembly calculates the target speed of the compressor based on the target evaporator temperature (which is calculated by the room temperature sensor, outside temperature sensor, solar sensor and the actual evaporator temperature that is detected by the evaporator temperature sensor in order to control the compressor speed. The air conditioning amplifier assembly calculates the target evaporator temperature, which includes corrections based on the room temperature sensor, outside temperature sensor, the solar sensor, and evaporator temperature sensor. Accordingly, the air conditioning amplifier assembly controls the compressor speed to an extent that would not inhibit the proper cooling performance or defogging performance. Turns the air conditioning on automatically when the AUTO button is pressed when the blower is ON and the air conditioning is off. Decreases the compressor speed in order to ensure quietness when the vehicle is stopped or the engine is off. Defroster Control Defroster control logic is used to improve defroster performance. PTC Heater Control*1 When the hybrid system is operating (READY), and the blower with fan motor sub-assembly is turned on, the air conditioning amplifier assembly turns on the quick heater assembly if the conditions listed below are met. - Engine coolant temperature is below specified temperature. - Outside temperature is below specified temperature. - Tentative air mix damper opening angle is above the specified value (MAX HOT). Rear Defogger Control When the ignition switch is ON (IG) and the rear defogger switch is pushed, the system is activated to keep the defogger heater on for approx. 15 minutes. ECO Mode Control When the ECO mode switch (eco switch assembly) is turned on, the air conditioning amplifier assembly limits the air conditioning system performance. Diagnosis A Diagnostic Trouble Code (DTC) is stored in memory when the air conditioning amplifier detects a problem with the air conditioning system. *1: w/ Quick Heater Assembly
2. NEURAL NETWORK CONTROL In previous automatic air conditioning systems, the air conditioning amplifier assembly determined the required outlet air temperature and blower air volume in accordance with the calculation formula that has been obtained based on information received from the sensors. However, because the senses of a person are rather complex, a given temperature is sensed differently, depending on the environment in which the person is situated. For example, a given amount of solar radiation can feel comfortably warm in a cold climate, or extremely uncomfortable in a hot climate. Therefore, as a technique for effecting a higher level of control, a neural network has been adopted in the automatic air conditioning system. With this technique, the data that has been collected under varying environmental conditions is stored in the air conditioning amplifier assembly. The air conditioning amplifier assembly can then effect control to provide enhanced air conditioning comfort. The neural network control consists of neurons in the input layer, intermediate layer and output layer. The input layer neurons process the input data of the outside temperature, the amount of sunlight and the room temperature based on the outputs of the switches and sensors, and outputs it to the intermediate layer neurons. Based on this data, the intermediate layer neurons adjust the strength of the links among the neurons. The sum of these is then calculated by the output layer neurons in the form of the required outlet temperature, solar correction, target airflow volume and outlet mode control volume. Accordingly, the air conditioning amplifier assembly controls the servo motors and blower motor in accordance with the control volumes that have been calculated by the neural network control.
3. MODE POSITION AND DAMPER OPERATION Mode Position and Damper Operation TEXT IN ILLUSTRATION *a Air also blows out of the side registers *b Air also blows out of the side registers and defrosters *A for Cold Area Specification Vehicles - - FUNCTIONS OF MAIN DAMPERS Control Damper Operation Position Damper Position Operation Air Inlet Control Damper FRESH A Allows fresh air to enter. RECIRCULATION B Causes internal air to recirculate. Air Mix Control Damper MAX COLD to MAX HOT Temperature Setting C - D Varies the mixture ratio of warm air and cool air in order to regulate the temperature continuously between hot and cold. Air Outlet Control Damper DEF E, I Air blows out of the center defroster, side defroster and side registers. FOOT / DEF E, H Air blows out of the front and rear footwell register duct, side registers and center defroster. FOOT E, G Air blows out of the side registers, front and rear footwell register duct. In addition, air blows out slightly from the center defroster and side defrosters. BI-LEVEL F, H Air blows out of the front and rear footwell register ducts, front center registers and side registers. FACE F, I Air blows out of the front center registers and side registers.
4. AIR OUTLETS AND AIRFLOW VOLUME Air Outlets and Airflow Volume TEXT IN ILLUSTRATION *A for Cold Area Specification Vehicles - - Indication Mode FACE FOOT DEF CTR SIDE C D A B FACE B/L FOOT F/D DEF The size of each circle o indicates the ratio of airflow volume.
5. COMPRESSOR WITH MOTOR ASSEMBLY General HINT: In order to ensure the proper insulation of the internal high-voltage portion of the compressor and the compressor housing, this vehicle has adopted a compressor oil (ND-OIL 11) with a high level of insulation performance. Therefore, never use a compressor oil other than ND-OIL 11 type compressor oil or its equivalent. Along with the use of the hybrid system on this vehicle, an electric inverter compressor that is driven by a motor is used. The basic construction and operation of this compressor are the same as an ordinary scroll compressor, except that it is driven by an electric motor. The Air Conditioning (A/C) inverter is integrated with the compressor. The electric motor is actuated by 3-phase alternating current (244.8 V) supplied by the A/C inverter. As a result, the air conditioning control system on this vehicle is actuated without depending on the operation of the engine, thus realizing a comfortable air conditioning system and low fuel consumption. Due to the use of an electric inverter compressor, the compressor speed can be controlled at the required speed calculated by the air conditioning amplifier assembly. Thus, the cooling and dehumidification performance and power consumption have been optimized. Low-moisture permeation hoses are used for the suction and discharge hoses at the compressor in order to minimize the entry of moisture into the refrigeration cycle. The compressor uses high-voltage alternating current. If a short or open circuit occurs in the compressor, the power management control ECU will cut off the A/C inverter circuit in order to stop the power supply to the compressor motor. Compressor Speed Control The air conditioning amplifier assembly calculates the target compressor speed based on the target evaporator temperature (calculated from the temperature control switch, room temperature sensor, ambient temperature sensor, and solar sensor and the actual evaporator temperature detected by the evaporator temperature sensor. Then, the air conditioning amplifier assembly transmits the target speed to the power management control ECU. The power management control ECU controls the A/C inverter based on the target speed data in order to control the compressor to a speed that suits the operating condition of the air conditioning system. The air conditioning amplifier assembly calculates the target evaporator temperature, which includes corrections based on the room temperature sensor, outside temperature sensor, solar sensor, and evaporator temperature sensor. Accordingly, the air conditioning amplifier assembly controls the compressor speed to an extent that does not inhibit the proper cooling performance or defogging performance. As a result, comfort and low fuel consumption can be realized.
6. EVAPORATOR TEMPERATURE SENSOR (NO. 1 COOLER THERMISTOR) The evaporator temperature sensor (No. 1 cooler thermistor) detects the temperature of the cool air immediately through the evaporator in the form of resistance changes, and outputs it to the air conditioning amplifier assembly.
7. BLOWER MOTOR WITH FAN SUB-ASSEMBLY The blower motor with fan sub-assembly has a built-in blower controller, and is controlled using duty control performed by the air conditioning amplifier assembly.
8. BUS CONNECTOR (AIR CONDITIONING HARNESS ASSEMBLY) BUS connectors are used in the wire harness that connects the servo motors to the air conditioning amplifier assembly. Each BUS connector has a built-in communication/driver IC which communicates with the air conditioning amplifier assembly, actuates the servo motor, and has a position detection function. This enables bus communication for the servo motor wire harness, for a more lightweight construction and a reduced number of wires.
9. SERVO MOTOR The pulse pattern type servo motor consists of a printed circuit board and a servo motor. The printed circuit board has three contact points, and can transmit two ON-OFF signals to the air conditioning amplifier assembly based on the difference of the pulse phases. The BUS connector can detect the damper position and movement direction with these signals.
10. PTC HEATER (w/ QUICK HEATER ASSEMBLY) General The quick heater assembly is located above the heater core in the air conditioning unit. The quick heater assembly consists of a PTC element, aluminum fins, and brass plates. When current is applied to the PTC element, it generates heat to warm the air that passes through the unit. TEXT IN ILLUSTRATION *1 Quick Heater Assembly *2 Brass Plate *3 PTC Element *4 Aluminum Fin Quick heater assembly operating conditions The quick heater assembly is turned on and off by the air conditioning amplifier assembly in accordance with the engine coolant temperature, ambient temperature, temperature setting, and electrical load (generator power ratio).
11. ECO MODE CONTROL Under the control of eco mode, the air conditioning amplifier assembly restricts the air conditioning system performance under specified conditions, thus improving fuel economy.
12. ROOM TEMPERATURE SENSOR (COOLER THERMISTOR) The room temperature sensor (cooler thermistor) detects the cabin temperature based on changes in the resistance of its built-in thermistor and sends a signal to the air conditioning amplifier assembly.
13. AMBIENT TEMPERATURE SENSOR (THERMISTOR ASSEMBLY) The ambient temperature sensor (thermistor assembly) detects the outside temperature based on changes in the resistance of its built-in thermistor and sends a signal to the air conditioning amplifier assembly.
14. SOLAR SENSOR The solar sensor detects (in the form of changes in the current that flows thought the built-in photo diode) the changes in the amount of sunlight and outputs these sunlight strength signals to the air conditioning amplifier assembly.
15. AIR CONDITIONING PRESSURE SENSOR The air conditioning pressure sensor detects the refrigerant pressure and outputs it to the air conditioning amplifier assembly in the form of voltage changes.

HOW TO PROCEED WITH TROUBLESHOOTING

HINT

1. Use the following procedure to troubleshoot the air conditioning system.
2. *: Use the Techstream.

1. VEHICLE BROUGHT TO WORKSHOP NEXT: Go to next step
2. INSPECT AUXILIARY BATTERY VOLTAGE Measure the auxiliary battery voltage with the ignition switch off. Standard Voltage 11 to 14 V If the voltage is below 11 V, recharge or replace the auxiliary battery before proceeding to the next step. NEXT: Go to next step
3. CHECK COMMUNICATION FUNCTION OF LIN COMMUNICATION SYSTEM* Use the Techstream to check if the LIN communication system is functioning normally. Result Result Proceed to LIN DTC is not output A LIN DTC is output B B --> GO TO LIN COMMUNICATION SYSTEM. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(/toyota/prius-c/i-2011-2015/remont/communication-devices/#lin-communication-system-diagnostics-introduction__how-to-proceed-with-troubleshooting) A: Go to next step
4. CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM* Use the Techstream to check if the CAN communication system is functioning normally. Result Result Proceed to CAN DTC is not output A CAN DTC is output B B --> GO TO CAN COMMUNICATION SYSTEM. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(/toyota/prius-c/i-2011-2015/remont/communication-devices/#can-communication-system-diagnostics-introduction) A: Go to next step
5. CHECK FOR DTC* Check for DTCs and note any code that is output. Clear the DTCs. Recheck for DTCs. Based on the DTCs output above, try to force the A/C system to output DTCs by simulating the conditions indicated by the DTC. Result Result Proceed to DTC is output A DTC is not output B B --> Go to step 7 A: Go to next step
6. DIAGNOSTIC TROUBLE CODE CHART Find the output DTCs in the diagnostic trouble code chart. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-c/i-2011-2015/remont/automatic-hvac-system/#air-conditioning-system-diagnostics-introduction__diagnostic-trouble-code-chart) . NEXT --> Go to step 9
7. PROBLEM SYMPTOMS TABLE Refer to Problem Symptoms Table. Refer to «PROBLEM SYMPTOMS TABLE»(/toyota/prius-c/i-2011-2015/remont/automatic-hvac-system/#air-conditioning-system-diagnostics-introduction__problem-symptoms-table) . Result Result Proceed to Fault is not listed in Problem Symptoms Table A Fault is listed in Problem Symptoms Table B B --> Go to step 9 A: Go to next step
8. OVERALL ANALYSIS AND TROUBLESHOOTING* Panel diagnosis (indicator check, sensor check). Refer to «DIAGNOSIS SYSTEM»(/toyota/prius-c/i-2011-2015/remont/automatic-hvac-system/#air-conditioning-system-diagnostics-introduction) Data List / Active Test. Refer to «DATA LIST / ACTIVE TEST»(/toyota/prius-c/i-2011-2015/remont/automatic-hvac-system/#air-conditioning-system-diagnostics-introduction__data-list-active-test) Terminals of ECU. Refer to «TERMINALS OF ECU»(/toyota/prius-c/i-2011-2015/remont/automatic-hvac-system/#air-conditioning-system-diagnostics-introduction) On-vehicle Inspection Inspection NEXT: Go to next step
9. ADJUST, REPAIR OR REPLACE NEXT --> END

CUSTOMIZE PARAMETERS

1. CUSTOMIZE AIR CONDITIONING SYSTEM Customizing with the Techstream HINT: The following items can be customized. NOTE: When the customer requests a change in a function, first make sure that the function can be customized. Be sure to make a note of the current settings before customizing. When troubleshooting a function, first make sure that the function is set to the default setting. Connect the Techstream. Turn the ignition switch to ON (IG). Turn the Techstream on. Enter the following menus: Customize Setting / Air Conditioner. Select the setting by referring to the table below. AIR CONDITIONER Tester Display Default Content Setting Relevant ECU Set Temperature Shift Normal Function to perform control with the shifted temperature versus the displayed temperature -2C, -1C, Normal, +1C, +2C Air Conditioning Amplifier Assembly Compressor Mode Automatic Function to turn the A/C on automatically by pressing the AUTO button when the blower is on and the A/C is off Automatic or Manual Air Conditioning Amplifier Assembly Foot/DEF Auto Mode ON Function to turn the airflow from FOOT/DEF on automatically when AUTO MODE is on ON or OFF Air Conditioning Amplifier Assembly Foot/DEF Automatic Blow Up Function ON Function to increase the blower level automatically when the defroster is on ON or OFF Air Conditioning Amplifier Assembly Ambient Temperature Shift Normal Function to display shifted ambient temperature versus actual ambient temperature -3C, -2C, -1C, Normal, +1C, +2C, +3C Air Conditioning Amplifier Assembly ECO MODE Cancel OFF Function to cancel the ECO mode drive when item is on OFF or ON Air Conditioning Amplifier Assembly Noise and Vibration Reduction OFF Function to change speed of the compressor when item is on OFF or ON Air Conditioning Amplifier Assembly Refrigerant Shortage Check ON Function to cancel the refrigerant shortage check (check performed during normal operation) when item is off ON or OFF Air Conditioning Amplifier Assembly Fan speed increment control Normal Function to define how fast the AC blower goes to target speed when first activating the AC Slow, Normal, Fast Air Conditioning Amplifier Assembly

INITIALIZATION

1. INITIALIZATION SERVO MOTOR Turn the ignition switch off. Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Press the A/C OFF switch. Turn the Techstream on. Enter the following menus: Body Electrical / Air Conditioner / Utility / Servomotor Initialization. According to the Techstream display, perform servomotor initialization. HINT: During initialization, the A/C AUTO indicator light comes on, and then goes off when initialization has finished. According to the Techstream display, select the "Exit" switch to finish initialization.

PROBLEM SYMPTOMS TABLE

HINT

1. Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
2. Inspect the fuses and relays related to this system before inspecting the suspected areas below.

AIR CONDITIONING SYSTEM

1. *1: w/ Quick Heater Assembly
2. *2: w/ Exhaust Heat Recirculation System

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1. AIR CONDITIONING AMPLIFIER ASSEMBLY HINT: Check from the rear of the connector while it is connected to the air conditioning amplifier assembly. Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition G34-1 (IG+) - G34-14 (GND) V - W-B Power source (IG) Ignition switch ON (IG) 11 to 14 V G34-1 (IG+) - G34-14 (GND) V - W-B Power source (IG) Ignition switch off Below 1 V G34-3 (PTC3) - G34-14 (GND)*1 R - W-B Quick heater operation signal Ignition switch ON (READY) ECO mode switch (eco switch assembly) off Blower motor on Temperature settings: MAX HOT Engine coolant temperature approximately 50°C lower Ambient temperature 10°C or lower IDH terminal signal less than 1 V (Inverter with converter assembly overload not detected) Below 1 V G34-4 (ECOS) - G34-14 (GND) R - W-B ECO mode switch (eco switch assembly) signal Ignition switch ON (IG) ECO mode switch (eco switch assembly): on Below 1 V G34-4 (ECOS) - G34-14 (GND) R - W-B ECO mode switch (eco switch assembly) signal Ignition switch ON (IG) ECO mode switch (eco switch assembly): off 11 to 14 V G34-5 (TAM) - G34-13 (SG-2) W - B Ambient temperature sensor signal Ignition switch ON (IG) Ambient temperature: 25°C (77°F) 1.8 to 2.2 V G34-5 (TAM) - G34-13 (SG-2) W - B Ambient temperature sensor signal Ignition switch ON (IG) Ambient temperature: 40°C (104°F) 0.9 to 1.2 V G34-9 (PRE) - G34-13 (SG-2) GR - B Air conditioning pressure sensor signal Ignition switch ON (READY) A/C system operating Refrigerant pressure: Abnormal pressure (more than 3025 kPa (30.9 kgf/cm 2 , 439 psi)) 4.62 V or higher G34-9 (PRE) - G34-13 (SG-2) GR - B Air conditioning pressure sensor signal Ignition switch ON (READY) A/C system operating Refrigerant pressure: Abnormal pressure (less than 176 kPa (1.8 kgf/cm 2 , 25 psi)) Below 0.74 V G34-9 (PRE) - G34-13 (SG-2) GR - B Air conditioning pressure sensor signal Ignition switch ON (READY) A/C system operating Refrigerant pressure: Normal pressure (less than 3025 kPa (30.9 kgf/cm 2 , 439 psi) and more than 176 kPa (1.8 kgf/cm 2 , 25 psi)) 0.74 to 4.62 V G34-10 (S5-3) - G34-13 (SG-2) Y - B Power supply for air conditioning pressure sensor Ignition switch ON (IG) 4.75 to 5.25 V G34-10 (S5-3) - G34-13 (SG-2) Y - B Power supply for air conditioning pressure sensor Ignition switch off Below 1 V G34-11 (CANH) - G34-12 (CANL) V - W CAN communication system CAN communication occurring Pulse generation G34-13 (SG-2) - Body ground B - Body ground Ground for air conditioning pressure sensor, ambient temperature sensor Always Below 1 V G34-14 (GND) - Body ground W-B - Body ground Ground for main power supply Always Below 1 V G34-21 (B) - G34-14 (GND) BE - W-B Power source (Back-up) Ignition switch off 11 to 14 V G34-22 (BLW) - G34-14 (GND) R - W-B Blower motor speed control signal Ignition switch ON (IG) Blower switch: LO Pulse generation (See waveform 1) G34-27 (IDH) - G34-14 (GND)*1 L - W-B Inverter with converter assembly current over signal Ignition switch ON (IG) (inverter with converter assembly overload not detected) less than 1 V G34-29 (TR) - G34-34 (SG-1) P - SB Room temperature sensor signal Ignition switch ON (IG) Cabin temperature: 25°C (77°F) 1.8 to 2.2 V G34-29 (TR) - G34-34 (SG-1) P - SB Room temperature sensor signal Ignition switch ON (IG) Cabin temperature: 40°C (104°F) 1.2 to 1.6 V G34-30 (S5-4) - G34-14 (GND) R - W-B Power supply for solar sensor Ignition switch ON (IG) 4.75 to 5.25 V G34-30 (S5-4) - G34-14 (GND) R - W-B Power supply for solar sensor Ignition switch off Below 1 V G34-33 (TS) - G34-14 (GND) V - W-B Solar sensor signal Ignition switch ON (IG) Solar sensor subjected to electric light 0.8 to 4.3 V G34-33 (TS) - G34-14 (GND) V - W-B Solar sensor signal Ignition switch ON (IG) Solar sensor covered with a cloth Below 0.8 V G34-34 (SG-1) - Body ground SB - Body ground Ground for room temperature sensor Always Below 1 V G34-37 (LIN1) - G34-14 (GND) LG - W-B LIN communication signal Ignition switch ON (IG) Pulse generation G34-39 (PTC2) - G34-14 (GND)*1 BR - W-B Quick heater operation signal Ignition switch ON (READY) ECO mode switch (eco switch assembly) off Blower motor on Temperature settings: MAX HOT Engine coolant temperature approximately 50°C lower Ambient temperature 10°C or lower IDH terminal signal less than 1 V (Inverter with converter assembly overload not detected) Below 1 V G34-40 (PTC1) - G34-14 (GND)*1 V - W-B Quick heater operation signal Ignition switch ON (READY) ECO mode switch (eco switch assembly) off Blower motor on Temperature settings: MAX HOT Engine coolant temperature approximately 50°C or lower Ambient temperature 10°C or lower IDH terminal signal less than 1 V (Inverter with converter assembly overload not detected) Below 1 V z1-2 (BUS G) - Body ground - Ground for BUS IC Always Below 1 V z1-3 (BUS) - z1-2 (BUS G) - BUS IC control signal Ignition switch ON (IG) Pulse generation z1-4 (B BUS) - z1-2 (BUS G) - Power supply for BUS IC Ignition switch off 11 to 14 V z1-5 (SGA) - Body ground - Ground for evaporator temperature sensor Always Below 1 V z1-6 (TEA) - z1-5 (SGA) - Evaporator temperature sensor signal Ignition switch ON (IG) Evaporator temperature: 0°C (32°F) 2.0 to 2.4 V z1-6 (TEA) - z1-5 (SGA) - Evaporator temperature sensor signal Ignition switch ON (IG) Evaporator temperature: 15°C (59°F) 1.4 to 1.8 V *1: w/ Quick Heater Assembly Waveform 1: Item Content Terminal No. G34-22 (BLW) - G34-14 (GND) Tool Setting 1 V/DIV., 500 μs/DIV. Vehicle Condition Power switch on (IG) Blower switch: LO
2. AIR CONDITIONING PANEL (HEATER CONTROL SWITCH BOARD) HINT: Check from the rear of the connector while it is connected to the air conditioning panel (heater control switch board). Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition G33-2 (LIN1) - Body ground LG - Body ground LIN communication signal Ignition switch ON (IG) Pulse generation G33-3 (SWO) - G33-8 (GND) G - W-B Steering pad switch assembly signal Ignition switch off Below 1 V G33-3 (SWO) - G33-8 (GND) G - W-B Steering pad switch assembly signal Ignition switch ON (IG) 4.5 to 5.5 V G33-5 (IG+) - G33-8 (GND) V - W-B Power source (IG) Ignition switch off Below 1 V G33-5 (IG+) - G33-8 (GND) V - W-B Power source (IG) Ignition switch ON (IG) 11 to 14 V G33-6 (ILL+) - Body ground R - Body ground Illumination signal Light control switch off Below 1 V G33-6 (ILL+) - Body ground R - Body ground Illumination signal Light control switch tail or head position 11 to 14 V G33-7 (ILL-) - Body ground W - Body ground Illumination signal Light control switch off Below 1 V G33-7 (ILL-) - Body ground W - Body ground Illumination signal Light control switch tail or head position Pulse generation G33-8 (GND) - Body ground W-B - Body ground Ground for air conditioning panel (heater control switch board) Always Below 1 V
3. POWER MANAGEMENT CONTROL ECU
4. INVERTER WITH CONVERTER ASSEMBLY

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1. DESCRIPTION Air conditioning system data and the Diagnostic Trouble Codes (DTCs) can be read through the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning, use the Techstream to check for malfunctions and perform troubleshooting.
2. CHECK DLC3 Check the DLC3. Refer to «GENERAL INFORMATION»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) .
3. LIST OF OPERATION METHODS By operating each of the air conditioning control switches as shown in the diagram below, it is possible to enter diagnostic check mode.
4. INDICATOR CHECK Turn the ignition switch off. Turn the ignition switch to ACC and wait at least 5 seconds. Turn the ignition switch to ON (IG) while pressing the air conditioning control assembly "AUTO" switch and "Recirculation/Fresh" switch simultaneously. Hold both switches until the indicator check screen appears. The indicator check is automatically performed when panel diagnosis is activated. Check that the indicators light up and go off 4 times at 1 second intervals continuously. TEXT IN ILLUSTRATION *a Indicator Blinking Pattern *b ON *c OFF *d 1 sec. HINT: The sensor check automatically starts when the indicator check is completed. Press the "OFF" switch to cancel check mode.
5. SENSOR CHECK (DTC CHECK) Start the hybrid system and warm it up. Perform the indicator check. HINT: After the indicator check is completed, the system enters DTC check mode automatically. Read the DTC displayed on the accessory meter display. TEXT IN ILLUSTRATION *a Diagnostic Trouble Code (DTC) NOTE: In sensor check mode, which is automatically entered after indicator check mode, troubleshooting may be partially performed. Be sure to perform the sensor check again. HINT: Refer to Diagnostic Trouble Code Chart for details of the codes. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-c/i-2011-2015/remont/automatic-hvac-system/#air-conditioning-system-diagnostics-introduction__diagnostic-trouble-code-chart) . When there are no problems, DTC 00 is output. As an example, the illustration shows that DTC 12 is output. If the DTCs are difficult to read because they change automatically, turn the "TEMP" switch clockwise to display the DTCs one at a time so that they can be read easily. The DTCs change step by step each time the "TEMP" switch is turned clockwise. HINT: Press the "OFF" switch to finish panel diagnosis. Clear DTCs During the sensor check, press the "FRONT DEF" switch and "REAR DEF" switch simultaneously.

DTC CHECK / CLEAR

1. DTC CHECK USING TECHSTREAM Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Air Conditioner / Trouble Codes. Check for DTCs.
2. DTC CLEAR USING TECHSTREAM Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Air Conditioner / Trouble Codes. Clear DTCs.

Scheme 28

1. REFRIGERANT SHORTAGE CHECK IN NORMAL OPERATION (CHECK A/C SWITCH INDICATOR AND DTC) Turn the ignition switch to ON (READY). Check that the A/C switch indicator is turned on when the following conditions are met. MEASUREMENT CONDITION Item Condition A/C Switch On A/C operation time 15 minutes or more Ambient temperature* 0 to 49°C (32 to 120°F) Engine coolant temperature 45°C (113°F) or more *: If the ambient temperature is not within the range shown, do not perform this check. HINT: The A/C switch indicator and air conditioning system turn off after 11 minutes if the amount of refrigerant in the system is insufficient. Connect the Techstream to the DLC3. Check for DTC B14B8. RESULT Result Amount of Refrigerant Corrective Action DTC B14B8 is output Empty or nearly empty Check for refrigerant leaks using a halogen leak detector, and repair if necessary. Refer to «REPLACEMENT»(/toyota/prius-c/i-2011-2015/remont/automatic-hvac-system/#air-conditioning-system-service-information) . DTC B14B8 is not output Correct or insufficient Perform a refrigerant shortage check using the Techstream.
2. REFRIGERANT SHORTAGE CHECK USING THE TECHSTREAM Connect the Techstream to the DLC3. Turn the ignition switch to ON (READY). Turn the Techstream on. Enter the following menus: Body Electrical / Air Conditioner / Utility / Refrigerant Shortage Check. According to the display on the Techstream, perform the refrigerant shortage check when the following conditions are met. MEASUREMENT CONDITION Item Condition A/C Switch On Ambient temperature* 0 to 49°C (32 to 120°F) R/F Switch Recirculation (Ambient temperature is 30°C (86°F) or less) Fresh (Ambient temperature is 31°C (87°F) or more) Blower Speed HI Temperature Setting MAX HOT *: If the ambient temperature is not within the range shown, do not perform this check. HINT: Refer to the Techstream operator's manual for further details. A message indicating a refrigerant shortage is displayed on the Techstream and the air conditioning system turns off if the amount of refrigerant in the system is insufficient. DTCs are not stored when performing the refrigerant shortage check using the Techstream. RESULT Result Amount of Refrigerant Corrective Action Refrigerant shortage Insufficient or leakage Check for refrigerant leaks using a halogen leak detector, and repair if necessary. Refer to «REPLACEMENT»(/toyota/prius-c/i-2011-2015/remont/automatic-hvac-system/#air-conditioning-system-service-information) . Evacuate the air conditioning system and charge it with the appropriate volume of new or purified refrigerant. Refrigerant correct Correct

DATA LIST / ACTIVE TEST

1. DATA LIST Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time. NOTE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not. Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Air Conditioner / Data List. Check the value(s) by referring to the table below. AIR CONDITIONER Tester Display Measurement Item/Range Normal Condition Diagnostic Note Room Temperature Sensor Room temperature sensor (cooler thermistor) / Min.: -6.50°C (20.30°F) Max.: 57.25°C (135.05°F) Actual cabin temperature displayed - Ambient Temp Sensor Ambient temperature sensor (thermistor assembly) / Min.: -23.30°C (-9.94°F) Max.: 65.95°C (150.71°F) Actual ambient temperature displayed - Adjusted Ambient Temp Adjusted ambient temperature / Min.: -30.80°C (-23.44°F) Max.: 50.80°C (123.44°F) - - Evaporator Fin Thermistor Evaporator temperature sensor (No. 1 cooler thermistor) / Min.: -29.70°C (-21.46°F) Max.: 59.55°C (139.19°F) Actual evaporator temperature displayed - Evaporator Target Temp Evaporator target temperature / Min.: -327.68°C (-557.82°F) Max.: 327.67°C (621.81°F) Evaporator target temperature displayed - Solar Sensor (D Side) Solar sensor / Min.: 0 Max.: 255 Solar sensor value increases as brightness increases - Engine Coolant Temp Engine coolant temperature sensor / Min.: 1.30°C (34.34°F) Max.: 90.55°C (194.99°F) Actual engine coolant temperature displayed - Set Temperature (D Side) Set temperature / Min.: MAX COLD Max.: MAX HOT Set temperature displayed - Blower Motor Speed Level Blower motor speed level / Min.: 0 Max.: 31 Displayed speed level increases in range between 0 and 31 as blower motor speed increases - Regulator Pressure Sensor Air conditioning pressure sensor / Min.: -456.68 kPa (-66.2 psi(gauge)) Max.: 3294.37 kPa (478 psi(gauge)) Actual pressure displayed - Air Mix Servo Targ Pulse(D) No. 1 air conditioning radiator damper servo sub-assembly (air mix) target pulse / Min.: 128 Max.: 383 MAX. COLD: 257 (pulse) MAX. HOT: 173 (pulse) - Air Mix Servo Actual Pulse(D) No. 1 air conditioning radiator damper servo sub-assembly (air mix) actual pulse / Min.: 128 Max.: 383 MAX. COLD: 257 (pulse) MAX. HOT: 173 (pulse) - Air Outlet Servo Pulse (D) No. 2 air conditioning radiator damper servo sub-assembly (air outlet) target pulse / Min.: 128 Max.: 383 FACE: 267 (pulse) B/L: 250 (pulse) FOOT: 227 (pulse) FOOT/DEF: 220 (pulse) DEF: 206 (pulse) - Air Outlet Servo Actu Pulse(D) No. 2 air conditioning radiator damper servo sub-assembly (air outlet) actual pulse / Min.: 128 Max.: 383 FACE: 267 (pulse) B/L: 250 (pulse) FOOT: 227 (pulse) FOOT/DEF: 220 (pulse) DEF: 206 (pulse) - Air Inlet Damper Targ Pulse No. 1 blower damper servo sub-assembly (air inlet) target pulse / Min.: 128 Max.: 383 RECIRCULATION: 287 (pulse) FRESH: 254 (pulse) - Air Inlet Damper Actual Pulse No. 1 blower damper servo sub-assembly (air inlet) actual pulse / Min.: 128 Max.: 383 RECIRCULATION: 287 (pulse) FRESH: 254 (pulse) - Electric Heater Count*1 Maximum heater operation level / Min.: 0 Max.: 3 Maximum possible operation level of quick heater assembly displayed - Electric Heater Active Level*1 Actual heater operation level / Min.: 0 Max.: 3 Actual operation level of quick heater assembly displayed - Compressor Speed Compressor speed / Min.: 0 rpm Max.: 65535 rpm Actual compressor rotation speed displayed - Compressor Target Speed Compressor target speed / Min.: 0 rpm Max.: 65535 rpm Compressor target rotation speed displayed - Shift Set Temperature Shift set temperature / 2C decr, 1C decr, Normal, 1C incr, 2C incr Customized value displayed - Compressor Mode Compressor mode / Auto or Manual Customized value displayed - Noise and Vibration Reduction Noise and vibration reduction / OFF or ON Customized value displayed - ECO MODE Cancel ECO MODE Cancel / OFF or ON Customized value displayed - ECO Switch ECO mode switch (eco switch assembly) / OFF or ON ECO mode switch (eco switch assembly) operated: ON (when switch is pressed) - ECO mode switch (eco switch assembly) not operated: OFF (when switch is not pressed) - Refrigerant Shortage Check Refrigerant shortage check / ON or OFF Customized value displayed - Fan speed increment control Fan speed increment control / Slow, Normal, Fast Customized value displayed - Foot/DEF Auto Mode Foot/DEF Auto Mode / ON or OFF Customized value displayed - Foot/DEF Auto Blow Up Foot/DEF Auto blower speed increase / ON or OFF Customized value displayed - Ambient Temperature Shift Ambient temperature shift / 3C decr, 2C decr, 1C decr, Normal, 1C incr, 2C incr, 3C incr Customized value displayed - Pls Servo Test Sts Pulse servo motor test status/ Wait, Move, Comp, Error, Stop Pulse servo motor test status - Compressor Drive Check Compressor drive check / OK or NG NG: Compressor does not drive OK: Compressor drives - Number of Trouble Codes Number of trouble codes / Min.: 0 Max.: 255 Number of DTCs displayed - *1 w/ Quick Heater Assembly
2. ACTIVE TEST Using the Techstream to perform Active Tests allows relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Tests. Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Air Conditioner / Active Test. Check the operation by referring to the table below. AIR CONDITIONER Tester Display Test Part Control Range Diagnostic Note Blower Motor Blower motor with fan sub-assembly Min.: 0, Max.: 31 - Compressor Target Speed Compressor with motor assembly Min.: 0, Max.: 7500 - Defogger Relay (Rear) Defogger relay OFF, ON - Electrical Fan Electrical fan OFF, ON - Heater Active Level*1 Quick heater assembly Min.: 0, Max.: 3 - Air Mix Servo Targ Pulse(D) No. 1 air conditioning radiator damper servo sub-assembly (air mix) pulse Min.: 128, Max.: 383 Operates between 173 and 257 pulses Air Outlet Servo Pulse (D) No. 2 air conditioning radiator damper servo sub-assembly (air outlet) pulse Min.: 128, Max.: 383 Operates between 206 and 267 pulses Air Inlet Damper Targ Pulse No. 1 blower damper servo sub-assembly (air inlet) pulse Min.: 128, Max.: 383 Operates between 254 and 287 pulses *1 w/ Quick Heater Assembly

DIAGNOSTIC TROUBLE CODE CHART

AIR CONDITIONING SYSTEM

HYBRID CONTROL SYSTEM

1. *1: If the cabin temperature is approx. -18.6°C (-1.48°F) or lower, DTC B1411/11 may be output even though the system is normal.
2. *2: If the ambient temperature is approx. -52.9°C (-63.22°F) or lower, DTC B1412/12 may be output even though the system is normal.
3. *3: The air conditioning amplifier assembly stores the DTC of the respective malfunction if it has occurred for the period of time indicated in the brackets.

See also:
• INITIALIZATION
• PRECAUTION
• HOW TO PROCEED WITH TROUBLESHOOTING
• HOW TO PROCEED WITH TROUBLESHOOTING
• IG Power Source Circuit
• REMOVAL
• REMOVAL
• REMOVAL
• ON-VEHICLE INSPECTION
• GENERAL INFORMATION
• DIAGNOSTIC TROUBLE CODE CHART
• PROBLEM SYMPTOMS TABLE
• DIAGNOSIS SYSTEM
• DATA LIST / ACTIVE TEST