HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: B1471; A/C Inverter High Voltage Power Resource System Malfunction; 2018 - 2024 MY Camry HV [07/2017

Last Modified: 11-20-2023	6.11:8.1.0	Doc ID: RM1000000014XF1
Model Year Start: 2018	Model: Camry HV	Prod Date Range: [07/2017 - ]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: B1471; A/C Inverter High Voltage Power Resource System Malfunction; 2018 - 2024 MY Camry HV [07/2017 - ]

DTC

B1471

A/C Inverter High Voltage Power Resource System Malfunction

DESCRIPTION

The hybrid vehicle control ECU assembly monitors the voltage of the HV battery. The hybrid vehicle control ECU assembly stops compressor control and stores this DTC when the monitored voltage is outside the specified range.

This DTC will be stored as a history DTC. Compressor control may not resume unless the power switch is turned off.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory
B1471	A/C Inverter High Voltage Power Resource System Malfunction	Open or short in A/C inverter high voltage power resource system Boost inverter malfunctioning	Air conditioning wire Compressor with motor assembly Hybrid control system	Memorized

WIRING DIAGRAM

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:

Inspect the fuses for circuits related to this system before performing the following procedure.
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.
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PROCEDURE

1.	CHECK FOR DTC

(a) Check if hybrid control system DTCs are output.

Powertrain > Hybrid Control > Trouble Codes

Result	Proceed to
DTCs are not output	A
DTCs are output	B

GO TO HYBRID CONTROL SYSTEM

for Nickel Metal Hydride Battery: Click here

for Lithium-ion Battery: Click here

2.	INSPECT AIR CONDITIONING WIRE

CAUTION:

Be sure to wear insulated gloves.

(a) Disconnect the t1 and t2 air conditioning wire connectors.

HINT:

Click here

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
t1-2 (PB) - t2-1 (ACPB)	Always	Below 1 Ω

GO TO STEP 4

3.	INSPECT AIR CONDITIONING WIRE

CAUTION:

Be sure to wear insulated gloves.

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
t1-1 (PE) - t2-2 (ACPE)	Always	Below 1 Ω

REPLACE COMPRESSOR WITH MOTOR ASSEMBLY

REPLACE AIR CONDITIONING WIRE

4.	INSPECT AIR CONDITIONING WIRE

CAUTION:

Be sure to wear insulated gloves.

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
t1-2 (PB) - Body ground	Always	10 kΩ or higher

REPLACE COMPRESSOR WITH MOTOR ASSEMBLY

REPLACE AIR CONDITIONING WIRE