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 EV 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

Any of the following conditions is met:


  • Open in A/C inverter start-up signal system

  • Short in A/C inverter start-up signal system

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

  • Compressor with motor assembly

  • EV control ECU

  • Hybrid control system

  • CAN communication system

 -
DTC Detection Conditions
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition Power switch on (READY) ○ ○
Malfunction Status Open in A/C inverter start-up signal system ○ -
Short in A/C inverter start-up signal system - ○
Detection Time - -
Number of Trips 1 trip 1 trip

Tech Tips

DTC will be output when conditions for either of the patterns in the table above are met.

WIRING DIAGRAM

A01MJIWE04

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.

      for LHD: Click here

      for RHD: Click here

      Result
      Result Proceed to
      CAN communication system DTCs are not output A
      CAN communication system DTCs are output (for LHD) B
      CAN communication system DTCs are output (for RHD) C

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    C

    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

      Click here


      Powertrain > EV > 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 (EV CONTROL ECU - COMPRESSOR WITH MOTOR ASSEMBLY)

    CAUTION:

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


    1. Disconnect the A27 EV control ECU connector.

    2. Disconnect the D2 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
      A27-11 (STB) - D2-4 (STBI) Always Below 1 Ω
      A27-11 (STB) or D2-4 (STBI) - 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 D2 compressor with motor assembly connector.

    2. Disconnect the EV control ECU connector.

    3. A01MGJIC05
      *a

      Front view of wire harness connector

      (to EV Control ECU)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A27-11 (STB) - Body ground Power switch on (IG) 11 to 14 V
      A27-11 (STB) - Body ground Power switch off Below 1 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE EV CONTROL ECU Click here

    NG

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY Click here