Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: A/C Inverter High Voltage Power Resource Circuit Voltage Out of Range (B14711C)

Toyota Corolla Cross (2022-2024) Service Manual / Vehicle Interior / Heating / Air Conditioning / Air Conditioning System (for Hev Model) / A/C Inverter High Voltage Power Resource Circuit Voltage Out of Range (B14711C)

DESCRIPTION

The hybrid vehicle control ECU monitors the voltage of the HV battery. The hybrid vehicle control ECU 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

B14711C

A/C Inverter High Voltage Power Resource Circuit Voltage Out of Range

Diagnosis Condition:

  • READY ON

Malfunction Status:

  • Open or short in A/C inverter high voltage power resource system
  • Boost inverter malfunctioning

Detection Time:

  • None
  • HV air conditioning wire
  • Compressor with motor assembly
  • Hybrid control system

Memorized
DTC Detection Condition Combination Table
 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

Diagnosis Condition

READY ON

○

○

○

Malfunction

Open in A/C inverter high voltage power resource system

○

-

-

Short in A/C inverter high voltage power resource system

-

○

-

Boost inverter malfunctioning

-

-

○

Detection Time

-

-

-

Trip Count

1 trip

1 trip

1 trip

HINT:

If the conditions of either of these patterns are detected, a DTC will be stored

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.

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  • Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is removed.

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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.

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  • When the cable is disconnected from the negative (-) auxiliary battery terminal, the memory of various systems will be cleared. Because of this, be sure to make a record of the contents memorized in each system before starting work. When work is finished, adjust each system to its previous state.
  • 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.

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  • 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
B

GO TO HYBRID CONTROL SYSTEM

A

2.

INSPECT HV AIR CONDITIONING WIRE

CAUTION:

Be sure to wear insulated gloves.

(a) Remove the HV air conditioning wire.

HINT:

Click here

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

X1-2 (PB) - X2-1 (ACPB)

Always

Below 1 Ω

X1-1 (PE) - X2-2 (ACPE)

Always

Below 1 Ω

X1-2 (PB) - Other terminals and body ground

Always

10 kΩ or higher
OK

REPLACE COMPRESSOR WITH MOTOR ASSEMBLY

NG

REPLACE HV AIR CONDITIONING WIRE

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