HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): B1471; A/C Inverter High Voltage Power Resource System Malfunction; 2021 - 2024 MY RAV4 HV [08/2020

Last Modified: 01-30-2024	6.11:8.1.0	Doc ID: RM100000001RV71
Model Year Start: 2021	Model: RAV4 HV	Prod Date Range: [08/2020 - ]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): B1471; A/C Inverter High Voltage Power Resource System Malfunction; 2021 - 2024 MY RAV4 HV [08/2020 - ]

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 ignition switch is turned off.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory
B1471	A/C Inverter High Voltage Power Resource System Malfunction	Diagnosis condition: Ignition switch ON (READY) Malfunction status: Open or short in A/C inverter high voltage power resource system Detection time: None	CAN communication system Hybrid control system HV air conditioning wire Compressor with motor assembly	Memorized

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION:

Wear insulated gloves and pull out the service plug grip before inspection as procedures may require disconnecting high-voltage connectors. Carry the removed service plug in your pocket to prevent other technicians from accidentally reconnecting it while you are servicing the vehicle.
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 ignition 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.
- for AWD:
- for LITHIUM-ION BATTERY:
The hybrid control system and air conditioning system output DTCs separately. Perform troubleshooting for the hybrid control system first if DTCs from these systems are output simultaneously.

PROCEDURE

1.	CHECK CAN COMMUNICATION SYSTEM

(a) Using the Techstream, check if the CAN communication system is functioning normally.

Click here

Result	Proceed to
CAN communication system DTCs are not output	A
CAN communication system DTCs are output	B

GO TO CAN COMMUNICATION SYSTEM

2.	CHECK FOR DTC (HYBRID CONTROL SYSTEM)

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

for AWD:
for LITHIUM-ION BATTERY:

Powertrain > Hybrid Control > Trouble Codes

OK:

Hybrid control system DTCs are not output.

GO TO HYBRID CONTROL SYSTEM

for AWD:
for LITHIUM-ION BATTERY:

3.	INSPECT HV AIR CONDITIONING WIRE

CAUTION:

Be sure to wear insulated gloves.

(a) Remove the HV air conditioning wire.

Click here

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
Z1-2 (PB) - Z2-1 (ACPB)	Always	Below 1 Ω
Z1-1 (PE) - Z2-2 (ACPE)	Always	Below 1 Ω
Z1-2 (PB) - Other terminals and body ground	Always	10 kΩ or higher

REPLACE COMPRESSOR WITH MOTOR ASSEMBLY

REPLACE HV AIR CONDITIONING WIRE