Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001H96V
Model Year Start: 2020 Model: Corolla Prod Date Range: [01/2019 - 09/2022]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): HOW TO PROCEED WITH TROUBLESHOOTING; 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]

HOW TO PROCEED WITH TROUBLESHOOTING

CAUTION / NOTICE / HINT

HINT:

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

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) Inspect the auxiliary battery voltage with the power 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 Techstream, check for CAN communication system DTCs.

Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): DIAGNOSTIC TROUBLE CODE CHART

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 FOR DTC*

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

Body Electrical > Air Conditioner > Trouble Codes

Powertrain > Hybrid Control > Trouble Codes

(b) Clear the DTCs.

Body Electrical > Air Conditioner > Clear DTCs

Powertrain > Hybrid Control > 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

Powertrain > Hybrid Control > Trouble Codes

Result

Proceed to

DTCs are not output

A

DTCs are output

B

B

GO TO DIAGNOSTIC TROUBLE CODE CHART 2020 MY Corolla Corolla HV [01/2019 - 04/2020]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): DIAGNOSTIC TROUBLE CODE CHART 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): DIAGNOSTIC TROUBLE CODE CHART

A

6.

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

7.

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

8.

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

9.

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

10.

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

11.

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

12.

USE SIMULATION METHOD TO CHECK

Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: HOW TO PROCEED WITH TROUBLESHOOTING

NEXT

13.

CONFIRMATION TEST

NEXT

END