AIR CONDITIONING SYSTEM, Diagnostic DTC:B1471/71

DTC Code DTC Name
B1471/71 A/C Inverter High Voltage Power Resource System Malfunction

DESCRIPTION

The A/C inverter assembly monitors the voltage of the HV battery. It stops compressor control and stores the DTC when the monitored voltage is outside the specified range.

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

DTC No. DTC Detection Condition Trouble Area
B1471/71

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

  • The boost inverter is broken or malfunctioning

  • Electric vehicle fuse

  • No. 2 engine wire (harness or connector between compressor with motor assembly and inverter with converter assembly)

  • Compressor with motor assembly

  • Hybrid control system

  • CAN communication system

WIRING DIAGRAM

A004FVVE34

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.

Note


  • Inspect the fuses for circuits related to this system before performing the following inspection 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 Click here.

  • The hybrid control system and air conditioning system output DTCs separately. Inspect DTCs following the diagnosis procedure for the hybrid control system first if any DTCs from those systems are output simultaneously.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Use the GTS to check if the CAN communication system is functioning normally.

      OK
      CAN DTC is not output
      Result
      Result Proceed to
      OK A
      NG*1 B
      NG*2 C

      • *1: w/ Toyota Safety Sense

      • *2: w/o Toyota Safety Sense


    B

    GO TO CAN COMMUNICATION SYSTEM (w/ Toyota Safety Sense) Click here

    C

    GO TO CAN COMMUNICATION SYSTEM (w/o Toyota Safety Sense) Click here

    A

  2. CHECK DIAGNOSTIC TROUBLE CODE (HYBRID CONTROL SYSTEM)


    1. Check if DTCs for the hybrid control system are output using the GTS.

      OK
      Hybrid control system DTCs are not output.

    NG

    GO TO HYBRID CONTROL SYSTEM Click here

    OK

  3. INSPECT ELECTRIC VEHICLE FUSE

    CAUTION:

    Be sure to wear insulated gloves.


    1. Turn the ignition switch off.

    2. Remove the service plug grip Click here.

      CAUTION:

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

      Note

      After removing the service plug grip, turning the ignition switch to ON (READY) may cause a malfunction. Do not turn the ignition switch to ON (READY) with the service plug grip removed.

    3. Remove the inverter cover Click here.

      Note

      Be sure to prevent foreign objects or water from entering the inverter with converter assembly.

    4. A004FY0E02
      Text in Illustration
      *1 Electric Vehicle Fuse

      Check that bolts A and B are tightened securely.

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

      Standard Resistance

      Tester Item

      (Tester Connection)

      		 Condition Specified Condition

      Electric vehicle fuse

      (A - B)

      		 Always Below 1 Ω

    NG

    REPLACE ELECTRIC VEHICLE FUSE Click here

    OK

  4. INSPECT NO. 2 ENGINE WIRE

    CAUTION:

    Be sure to wear insulated gloves.


    1. Disconnect the No. 2 engine wire connector Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D1-1 (PE) - D2-2 (ACPE) Always Below 1 Ω
      D1-2 (PB) - D2-1 (ACPB) Always Below 1 Ω
      D1-1 (PE) - Body ground Always 10 kΩ or higher
      D1-2 (PB) - Body ground Always 10 kΩ or higher

    OK

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY Click here

    NG

    REPLACE NO. 2 ENGINE WIRE Click here