Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM1000000028C4J |
Model Year Start: 2023 |
Model: GR Corolla |
Prod Date Range: [11/2022 -
] |
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model with Automatic Air Conditioning System): Air Vent Temperature does not Change and Right Vent is Different from Left and Vice Versa (Same Left/Right Temperature Setting); 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 - ] |
Air Vent Temperature does not Change and Right Vent is Different from Left and Vice Versa (Same Left/Right Temperature Setting)
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DESCRIPTION
If the temperature of the air that blows from the left and right front registers differs even though the same temperature is set for both sides, the following factors may be the cause.
Symptom
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Factor
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Temperature of outlet air is cooler on left or right side
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(When same temperature set for both sides)
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Compressor with pulley assembly malfunction
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Refrigerant volume (low)
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Mechanical locking of damper and damper link
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Solar sensor (cooler thermistor) malfunction*1
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Solar sensor (automatic light control sensor) malfunction*2
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Harness or connector
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Temperature of outlet air is warmer on left or right side
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(When same temperature set for both sides)
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Mechanical locking of damper and damper link
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Blockage in heater radiator unit sub-assembly
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Harness or connector
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*1: w/o Automatic Light Control
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*2: w/ Automatic Light Control
WIRING DIAGRAM
w/o Automatic Light Control:
w/ Automatic Light Control:
CAUTION / NOTICE / HINT
NOTICE:
-
If DTC B14D215 is output, perform troubleshooting for that DTC first. (w/o Automatic Light Control)
Click here
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If DTC B124400 is output, perform troubleshooting for that DTC first. (w/ Automatic Light Control)
Click here
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The air conditioning system uses the CAN communication system. Inspect the communication functions by following How to Proceed with Troubleshooting. Troubleshoot the air conditioning system after confirming that the communication systems are functioning properly.
Click here
PROCEDURE
1.
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CHECK MALFUNCTION STATUS
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Result
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Proceed to
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Malfunction occurs during cooling
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A
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Malfunction occurs during heating
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B
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A
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|
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2.
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CHECK REFRIGERANT SHORTAGE
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(a) Prepare the vehicle according to the table below.
Measurement Condition:
Item
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Condition
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A/C Switch
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On
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Ambient Temperature*1
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0 to 49°C (32 to 120°F)
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Air Conditioning Air Inlet Temperature*2
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25 to 35°C (77 to 95°F)
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Set Temperature
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MAX COLD
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Recirculation/fresh Control Switch
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Recirculation
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Air Vent Damper Position
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FACE
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Blower Speed
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HI
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HINT:
*1: This inspection can be judged correctly only if the ambient temperature is within a range of 0 to 49°C (32 to 120°F). Therefore, postpone the test if the temperature is low.
*2: This inspection can be judged correctly only if the air inlet temperature is within a range of 25 to 35°C (77 to 95°F). Therefore, postpone the test if the temperature is out of range.
(b) Using the GTS, check the amount of refrigerant.
Body Electrical > Air Conditioner > Utility
Tester Display
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Refrigerant Gas Volume Check
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NOTICE:
If the conditions for the inspection are not met, "Refrigerant incorrect" will be displayed on the GTS. Confirm the conditions of the inspection and perform the check again.
HINT:
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If the amount of refrigerant is insufficient, "Refrigerant shortage" is displayed on the GTS and the indicator light on the A/C switch turns off.
-
When performing this inspection, a DTC will not be output even if "Refrigerant shortage" is displayed on the GTS.
Result
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Amount of Refrigerant
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Refrigerant shortage
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Insufficient or leakage
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Refrigerant correct
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Correct
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Refrigerant incorrect
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Incorrect
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OK:
"Refrigerant correct" is displayed on the GTS.
OK
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|
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3.
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PERFORM ACTIVE TEST USING GTS
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(a) Perform the Active Test according to the display on the GTS.
Body Electrical > Air Conditioner > Active Test
Tester Display
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Measurement Item
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Control Range
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Diagnostic Note
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Front Left Air Mix Damper Control Servo Motor
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This test activates the Front Left Air Mix Damper Control Servo Motor.
(No. 1 air conditioning radiator damper servo sub-assembly (front left side air mix))
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128: Min
384: Max
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Operate with ignition switch ON.
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Front Right Air Mix Damper Control Servo Motor
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This test activates the Front Right Air Mix Damper Control Servo Motor.
(No. 1 air conditioning radiator damper servo sub-assembly (front right side air mix))
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128: Min
384: Max
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Operate with ignition switch ON.
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Body Electrical > Air Conditioner > Active Test
Active Test Display
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Front Left Air Mix Damper Control Servo Motor
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Data List Display
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Front Left Air Mix Damper Control Servo Motor Actual Pulse
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Body Electrical > Air Conditioner > Active Test
Active Test Display
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Front Right Air Mix Damper Control Servo Motor
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Data List Display
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Front Right Air Mix Damper Control Servo Motor Actual Pulse
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OK:
Damper servo motor is operated.
OK
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|
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Result
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Proceed to
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w/o Automatic Light Control
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A
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w/ Automatic Light Control
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B
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A
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5.
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CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - SOLAR SENSOR (COOLER THERMISTOR))
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(a) Disconnect the m5 solar sensor (cooler thermistor) connector.
(b) Disconnect the I48 air conditioning amplifier assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
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Condition
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Specified Condition
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m5-1 - I48-2 (S5-1)
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Always
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Below 1 Ω
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m5-2 - I48-9 (TS)
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Always
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Below 1 Ω
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m5-1 or I48-2 (S5-1) - Other terminals and body ground
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Always
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10 kΩ or higher
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m5-2 or I48-9 (TS) - Other terminals and body ground
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Always
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10 kΩ or higher
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NG |
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REPAIR OR REPLACE HARNESS OR CONNECTOR
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OK
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|
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6.
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INSPECT SOLAR SENSOR (COOLER THERMISTOR)
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Click here
7.
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CHECK HARNESS AND CONNECTOR (SOLAR SENSOR (AUTOMATIC LIGHT CONTROL SENSOR) - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))
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(a) Disconnect the h1 solar sensor (automatic light control sensor) connector.
(b) Disconnect the I85 main body ECU (multiplex network body ECU) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
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Condition
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Specified Condition
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h1-1 (CLTB) - I85-8 (CLTB)
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Always
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Below 1 Ω
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h1-2 (CLTE) - I85-21 (CLTE)
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Always
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Below 1 Ω
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h1-4 (CLTS) - I85-20 (CLTS)
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Always
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Below 1 Ω
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h1-1 (CLTB) or I85-8 (CLTB) - Other terminals and body ground
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Always
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10 kΩ or higher
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h1-2 (CLTE) or I85-21 (CLTE) - Other terminals and body ground
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Always
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10 kΩ or higher
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h1-4 (CLTS) or I85-20 (CLTS) - Other terminals and body ground
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Always
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10 kΩ or higher
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NG |
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REPAIR OR REPLACE HARNESS OR CONNECTOR
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OK
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|
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8.
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INSPECT SOLAR SENSOR (AUTOMATIC LIGHT CONTROL SENSOR)
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Click here
9.
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BLEED AIR FROM COOLANT (COOLING SYSTEM)
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for M20A-FKS: Click here
for G16E-GTS: Click here
NEXT
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|
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10.
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CHECK OPERATION (AIR CONDITIONING SYSTEM)
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(a) Set the same temperature for the left and right sides and check that the air that blows from the left and right front registers is the same temperature.
OK:
The air from the left and right front registers is the same temperature.
OK |
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END (FAILURE DUE TO AIR ENTERING COOLANT)
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NG
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|
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11.
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PERFORM ACTIVE TEST USING GTS
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(a) Perform the Active Test according to the display on the GTS.
Body Electrical > Air Conditioner > Active Test
Tester Display
|
Measurement Item
|
Control Range
|
Diagnostic Note
|
Front Left Air Mix Damper Control Servo Motor
|
This test activates the Front Left Air Mix Damper Control Servo Motor.
(No. 1 air conditioning radiator damper servo sub-assembly (front left side air mix))
|
128: Min
384: Max
|
Operate with ignition switch ON.
|
Front Right Air Mix Damper Control Servo Motor
|
This test activates the Front Right Air Mix Damper Control Servo Motor.
(No. 1 air conditioning radiator damper servo sub-assembly (front right side air mix))
|
128: Min
384: Max
|
Operate with ignition switch ON.
|
Body Electrical > Air Conditioner > Active Test
Active Test Display
|
Front Left Air Mix Damper Control Servo Motor
|
Data List Display
|
Front Left Air Mix Damper Control Servo Motor Actual Pulse
|
Body Electrical > Air Conditioner > Active Test
Active Test Display
|
Front Right Air Mix Damper Control Servo Motor
|
Data List Display
|
Front Right Air Mix Damper Control Servo Motor Actual Pulse
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OK:
Damper servo motor is operated.
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