AIR CONDITIONING SYSTEM, Diagnostic DTC:B1473/73

DTC Code DTC Name
B1473/73 A/C Inverter Start-up Signal System Malfunction

DESCRIPTION

The inverter activation signal is sent to the compressor with motor assembly from the power management 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
B1473/73 A/C Inverter Start-up Signal System Malfunction Open or short in A/C inverter start-up signal system

  • Harness or connector between power management control ECU and compressor with motor assembly

  • Compressor with motor assembly

  • Power management control ECU

  • Hybrid control system

  • CAN communication system

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WIRING DIAGRAM

A0021UAE08

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


  • 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 from these systems are output simultaneously.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


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

      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 and hybrid control system DTCs are output.

      Click here


      Powertrain > Hybrid Control > Trouble Codes
      Body Electrical > Air Conditioner > Trouble Codes
      Result
      Result Proceed to
      Only DTC B1473/73 is output A
      DTCs B1473/73 and P3108 are output simultaneously (B1498/98 is not output)
      DTCs B1473/73 and B1498/98 are output simultaneously (P3108 is not output) B
      DTCs B1473/73, B1498/98 and P3108 are output simultaneously
      DTCs other than P3108 are output for hybrid control system C

    B

    GO TO DTC B1498/98 Click here

    C

    GO TO HYBRID CONTROL SYSTEM Click here

    A

  3. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - COMPRESSOR WITH MOTOR ASSEMBLY)

    CAUTION:

    Do not disconnect the connector on the high-voltage side.


    1. Disconnect the A63 power management control ECU connector.

    2. Disconnect the F15 compressor with motor assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A63-19 (STB) - F15-4 (STBI) Always Below 1 Ω
      A63-19 (STB) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT COMPRESSOR WITH MOTOR ASSEMBLY


    1. Reconnect the F15 compressor with motor assembly connector.

    2. A01MRNNC02
      *a

      Front view of wire harness connector

      (to Power Management Control ECU)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A63-19 (STB) - Body ground Power switch on (IG) 11 to 14 V
      A63-19 (STB) - Body ground Power switch off Below 1 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    NG

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY Click here