AIR CONDITIONING SYSTEM, Diagnostic DTC:B1473

DTC Code DTC Name
B1473 A/C Inverter Start-up Signal System Malfunction

DESCRIPTION

The inverter activation signal is sent to the compressor with motor assembly from the hybrid vehicle control ECU. Compressor control is stopped and this DTC is stored if there is an open or short in the signal circuit.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B1473 A/C Inverter Start-up Signal System Malfunction Open or short in A/C inverter start-up signal circuit

  • Harness or connector between hybrid vehicle control ECU and compressor with motor assembly

  • Compressor with motor assembly

  • Hybrid vehicle control ECU

  • Hybrid control system

  • CAN communication system

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WIRING DIAGRAM

B004OX8E05

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.

Note


  • 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.

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  • 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.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Using the GTS, check if the CAN communication system is functioning normally.

      Tech Tips

      Click here

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

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. CHECK FOR DTC


    1. Check if air conditioning system DTCs are output.


      Body Electrical > Air Conditioner > Trouble Codes
      Result
      Result Proceed to
      B1473 and B1498 are output simultaneously A
      Only B1473 is output B

    A

    GO TO DTC B1498 Click here

    B

  3. CHECK FOR DTC


    1. Check if hybrid control system DTCs are output.


      Powertrain > Hybrid Control > Trouble Codes
      Result
      Result Proceed to
      DTCs are not output A
      DTCs are output B

    B

    GO TO HYBRID CONTROL SYSTEM Click here

    A

  4. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Air Conditioner / Active Test.

    5. Perform the Active Test according to the display on the GTS.


      Body Electrical > Air Conditioner > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Compressor Target Speed Compressor with motor assembly Min.: 0, Max.: 7500 -

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Compressor Target Speed
      OK
      Compressor with motor assembly operates normally.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY Click here