Toyota Yaris: Air Conditioning System / How To Proceed With Troubleshooting

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Vehicle Interior / Heating / Air Conditioning / Air Conditioning System / How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

HINT:

  • Use the following procedure to troubleshoot the air conditioning system.
  • *: Use the GTS.

PROCEDURE

1.

VEHICLE BROUGHT TO WORKSHOP

NEXT

2.

CUSTOMER PROBLEM ANALYSIS

HINT:

  • In troubleshooting, confirm that the problem symptoms have been accurately identified. Preconceptions should be discarded in order to make an accurate judgment. To clearly understand what the problem symptoms are, it is extremely important to ask the customer about the problem and the conditions at the time the malfunction occurred.
  • Gather as much information as possible for reference. Past problems that seem unrelated may also help in some cases.
  • The following 5 items are important points for problem analysis:

    What

    Vehicle model, system name

    When

    Date, time, occurrence frequency

    Where

    Road conditions

    Under what conditions?

    Driving conditions, weather conditions

    How did it happen?

    Problem symptoms

NEXT

3.

INSPECT AUXILIARY BATTERY VOLTAGE

(a) 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.

(b) Check the fuses and relays.

(c) Check the connector connections and terminals to make sure that there are no abnormalities such as loose connections, deformation, etc.

NEXT

4.

CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM*

(a) Using the GTS, check for CAN communication system DTCs.

Click here

Result

Proceed to

CAN communication system DTCs are not output

A

CAN communication system DTCs are output

B

B

GO TO CAN COMMUNICATION SYSTEM

A

5.

CHECK COMMUNICATION FUNCTION OF CXPI COMMUNICATION SYSTEM*

(a) Using the GTS, check for CXPI communication system DTCs.

Click here

Result

Proceed to

CXPI communication system DTCs are not output

A

CXPI communication system DTCs are output

B

B

GO TO CXPI COMMUNICATION SYSTEM

A

6.

CHECK POWER INTEGRATION SYSTEM*

(a) Using the GTS, check for power integration system DTCs.

Click here

Result

Proceed to

DTCs are not output

A

DTCs are output

B

B

GO TO POWER INTEGRATION SYSTEM

A

7.

CHECK VEHICLE CONTROL HISTORY (RoB)*

(a) Using the GTS, check for vehicle control history (RoB).

Body Electrical > Air Conditioner > Utility

Tester Display

Vehicle Control History (RoB)

(b) Record the vehicle control history.

Result

Proceed to

Vehicle control history is not output

A

Vehicle control history is output

B

B

GO TO VEHICLE CONTROL HISTORY (RoB)

A

8.

CHECK FOR DTC*

(a) Check for DTCs and note any codes that are output.

Body Electrical > Air Conditioner > Trouble Codes

(b) Clear the DTCs.

Body Electrical > Air Conditioner > Clear DTCs

(c) Recheck for DTCs. Based on the DTCs output above, try to force output of the air conditioning system DTC by simulating the operation indicated by the DTC.

Body Electrical > Air Conditioner > Trouble Codes

Result

Proceed to

DTCs are not output

A

DTCs are output

B

B

GO TO DIAGNOSTIC TROUBLE CODE CHART

A

9.

CHECK AIR CONDITIONING CONTROL ASSEMBLY

(a) Operate each switch on the air conditioning control assembly and check that the switches of the air conditioning system operate normally.

NG

GO TO PROBLEM SYMPTOMS TABLE

OK

10.

CHECK BLOWER CONTROL

(a) Operate the blower switch on the air conditioning control assembly and check that the blower control operates normally.

NG

GO TO PROBLEM SYMPTOMS TABLE

OK

11.

CHECK AIR INLET CONTROL

(a) Operate the recirculation/fresh switch on the air conditioning control assembly and check that the air inlet control operates normally.

NG

GO TO PROBLEM SYMPTOMS TABLE

OK

12.

CHECK AIR OUTLET CONTROL

(a) Operate the air outlet mode switch on the air conditioning control assembly and check that the air outlet control operates normally.

NG

GO TO PROBLEM SYMPTOMS TABLE

OK

13.

CHECK COOLING FUNCTION

(a) Operate the temperature adjustment switches on the air conditioning control assembly and check that cool air is blown from the registers.

NG

GO TO PROBLEM SYMPTOMS TABLE

OK

14.

CHECK HEATER FUNCTION

(a) Operate the temperature adjustment switches on the air conditioning control assembly and check that warm air is blown from the air registers.

NG

GO TO PROBLEM SYMPTOMS TABLE

OK

15.

USE SIMULATION METHOD TO CHECK

Click here

NEXT

16.

CONFIRMATION TEST

NEXT

END

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