Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Air Vent Temperature does not Change and Right Vent is Different from Left and Vice Versa (Same Left/Right Temperature Setting)

Toyota Corolla Cross (2022-2024) Service Manual / Vehicle Interior / Heating / Air Conditioning / Air Conditioning System (for Hev Model) / Air Vent Temperature does not Change and Right Vent is Different from Left and Vice Versa (Same Left/Right Temperature Setting)

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

Factor

Temperature of outlet air is cooler on left or right side

  • (When same temperature set for both sides)
  • Compressor with pulley assembly malfunction
  • Refrigerant volume (low)
  • Mechanical locking of damper and damper link
  • Automatic light control sensor malfunction
  • Harness or connector

Temperature of outlet air is warmer on left or right side

  • (When same temperature set for both sides)
  • Mechanical locking of damper and damper link
  • Blockage in heater radiator unit sub-assembly
  • Harness or connector

CAUTION / NOTICE / HINT

NOTICE:

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.

CHECK WHEN MALFUNCTION OCCURS
Result

Proceed to

When using cooling function

A

When using heater function

B
B

GO TO STEP 5

A

2.

CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Main Body > Trouble Codes

Result

Proceed to

B124400 is not output

A

B124400 is output

B
B

GO TO DTC B124400

A

3.

CHECK REFRIGERANT SHORTAGE

(a) Prepare the vehicle according to the table below.

Measurement Condition:

Item

Condition

A/C Switch

On

Ambient Temperature*1

0 to 49°C (32 to 120°F)

Air Conditioning Air Inlet Temperature*2

25 to 35°C (77 to 95°F)

Set Temperature

MAX COLD

Recirculation/fresh Control Switch

Recirculation

Air Vent Damper Position

FACE

Blower Speed

HI

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

Refrigerant Gas Volume Check

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:

  • 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

Amount of Refrigerant

Refrigerant shortage

Insufficient or leakage

Refrigerant correct

Correct

Refrigerant incorrect

Incorrect

OK:

"Refrigerant correct" is displayed on the GTS.

NG

CHARGE SYSTEM WITH REFRIGERANT

for HFO-1234yf(R1234yf): Click here
OK

4.

PERFORM ACTIVE TEST USING GTS

(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

No. 1 air conditioning radiator damper servo sub-assembly pulse

Min.: 128

Max.: 384

Operates between 165 to 257 pulses

Front Right Air Mix Damper Control Servo Motor

No. 1 air conditioning radiator damper servo sub-assembly pulse

Min.: 128

Max.: 384

Operates between 255 to 347 pulses
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

OK:

Damper servo motor is operated.

OK

INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET

NG

GO TO DTC TROUBLESHOOTING PROCEDURE FOR MALFUNCTIONING DAMPER SERVO MOTOR

5.

BLEED AIR FROM COOLING SYSTEM

(a) Bleed air from cooling system.

Click here

NEXT

6.

CHECK OPERATION (AIR CONDITIONING SYSTEM)

(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

END (MALFUNCTION DUE TO AIR IN COOLING SYSTEM)
NG

7.

PERFORM ACTIVE TEST USING GTS

(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

No. 1 air conditioning radiator damper servo sub-assembly pulse

Min.: 128

Max.: 384

Operates between 165 to 257 pulses

Front Right Air Mix Damper Control Servo Motor

No. 1 air conditioning radiator damper servo sub-assembly pulse

Min.: 128

Max.: 384

Operates between 255 to 347 pulses
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

OK:

Damper servo motor is operated.

OK

REPLACE HEATER RADIATOR UNIT SUB-ASSEMBLY

NG

GO TO DTC TROUBLESHOOTING PROCEDURE FOR MALFUNCTIONING DAMPER SERVO MOTOR

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