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

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Vehicle Interior / Heating / Air Conditioning / Air Conditioning System / 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 assembly with pulley 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.

PERFORM REFRIGERANT SHORTAGE CHECK

(a) Check that the following conditions are met and perform the refrigerant shortage check according to the display on the GTS.

Measurement Condition:

Item

Condition

A/C switch

On

Ambient temperature*1

0 to 49°C (32 to 120°F)

Blower speed

HI

*1: If the ambient temperature is not within the range shown, do not perform this check.

Body Electrical > Air Conditioner > Utility

Tester Display

Refrigerant Gas Volume Check

Result

Amount of Refrigerant

Refrigerant correct

Correct

Refrigerant shortage

Insufficient

OK:

"Refrigerant correct" is displayed on the GTS.

NG

CHARGE SYSTEM WITH REFRIGERANT

OK

4.

PERFORM ACTIVE TEST USING GTS (FRONT LEFT AIR MIX DAMPER CONTROL SERVO MOTOR, FRONT RIGHT AIR MIX DAMPER CONTROL SERVO MOTOR)

(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

-

Front Right Air Mix Damper Control Servo Motor

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

Min.: 128

Max.: 384

-

Body Electrical > Air Conditioner > Active Test

Tester Display

Front Left Air Mix Damper Control Servo Motor

Body Electrical > Air Conditioner > Active Test

Tester Display

Front Right Air Mix Damper Control Servo Motor

OK:

Each damper servo motor operates.

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 (FRONT LEFT AIR MIX DAMPER CONTROL SERVO MOTOR, FRONT RIGHT AIR MIX DAMPER CONTROL SERVO MOTOR)

(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

-

Front Right Air Mix Damper Control Servo Motor

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

Min.: 128

Max.: 384

-

Body Electrical > Air Conditioner > Active Test

Tester Display

Front Left Air Mix Damper Control Servo Motor

Body Electrical > Air Conditioner > Active Test

Tester Display

Front Right Air Mix Damper Control Servo Motor

OK:

Each damper servo motor operates.

OK

REPLACE HEATER RADIATOR UNIT SUB-ASSEMBLY

NG

GO TO DTC TROUBLESHOOTING PROCEDURE FOR MALFUNCTIONING DAMPER SERVO MOTOR

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