| 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] | ||
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HOW TO PROCEED WITH TROUBLESHOOTING |
CAUTION / NOTICE / HINT
HINT:
- Use the following procedure to troubleshoot the air conditioning system.
- *: Use the Techstream.
PROCEDURE
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1. |
VEHICLE BROUGHT TO WORKSHOP |
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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.
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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
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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.
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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](/t3Portal/stylegraphics/info.gif)
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Result |
Proceed to |
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CAN communication system DTCs are not output |
A |
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CAN communication system DTCs are output |
B |
| B |
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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
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Result |
Proceed to |
|---|---|
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DTCs are not output |
A |
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DTCs are output |
B |
| B |
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GO TO DIAGNOSTIC TROUBLE CODE CHART
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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 |
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7. |
CHECK BLOWER CONTROL |
(a) Operate the blower switch on the air conditioning control assembly and check that the blower control operates normally.
| NG |
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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 |
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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 |
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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 |
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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 |
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12. |
USE SIMULATION METHOD TO CHECK |
Click here
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13. |
CONFIRMATION TEST |
| NEXT |
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END |
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