Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM100000001H97G
Model Year Start: 2020 Model: Corolla Prod Date Range: [01/2019 - 09/2022]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): B1474; A/C Inverter; 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]

DTC

B1474

A/C Inverter

DESCRIPTION

If abnormal current in the A/C inverter output high voltage output circuit or a malfunction of temperature sensor in the compressor with motor assembly is detected, compressor control will be stopped and this DTC will be stored.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

B1474

A/C Inverter

A/C inverter malfunction

Compressor with motor assembly

Memorized

CAUTION / NOTICE / HINT

CAUTION:

  • Before inspecting the high-voltage system, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.
  • Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is removed.

NOTICE:

  • After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

    Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; INTRODUCTION: REPAIR INSTRUCTION: PRECAUTION

  • The hybrid control system and air conditioning system output DTCs separately. Perform troubleshooting for the hybrid control system first if DTCs for both systems are output simultaneously.
  • 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 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): HOW TO PROCEED WITH TROUBLESHOOTING

PROCEDURE

1.

REPLACE COMPRESSOR WITH MOTOR ASSEMBLY

(a) Replace the compressor with motor assembly.

Click here 2020 MY Corolla Corolla HV [01/2019 - 04/2020]; HEATING / AIR CONDITIONING: COMPRESSOR (for 2ZR-FXE): REMOVAL 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022]; HEATING / AIR CONDITIONING: COMPRESSOR (for 2ZR-FXE): REMOVAL

NOTICE:

As this DTC is stored when the compressor with motor assembly is malfunctioning, it is necessary to replace the compressor with motor assembly.

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