HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): B1472; A/C Inverter High Voltage Output System; 2020 - 2022 MY Corolla Corolla HV [01/2019

Last Modified: 07-31-2024	6.11:8.1.0	Doc ID: RM100000001H97E
Model Year Start: 2020	Model: Corolla	Prod Date Range: [01/2019 - 09/2022]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): B1472; A/C Inverter High Voltage Output System; 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]

DTC

B1472

A/C Inverter High Voltage Output System

DESCRIPTION

The inverter in the compressor with motor assembly outputs high-voltage electricity to operate the motor. If there is an open or short in the output circuit, the hybrid vehicle control ECU will stop compressor operation and store this DTC. This DTC will be stored as a history DTC. The compressor operation remains stopped until both the history and current DTCs are cleared.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory
B1472	A/C Inverter High Voltage Output System	Open or short in A/C inverter high voltage output circuit	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
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

PROCEDURE

1.	REPLACE COMPRESSOR WITH MOTOR ASSEMBLY

(a) Replace the compressor with motor assembly.

Click here

NOTICE:

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

END