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)
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
|
|
| Temperature of outlet air is warmer on left or right side
|
|
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 |
|
| 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 |
|
| 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 |
|
| 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 | - |
| Tester Display |
|---|
| Front Left Air Mix Damper Control Servo Motor |
| 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
|
| 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) |
|
| 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 | - |
| Tester Display |
|---|
| Front Left Air Mix Damper Control Servo Motor |
| 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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If a key is left in the vehicle, the functions of the key left in the vehicle are temporarily suspended to prevent theft of the vehicle.
To restore the functions, press the unlock button on the functions-suspended key in the vehicle.
