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 assembly. 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

  • Diagnosis condition: Power switch on (READY)

  • Malfunction status: Any of the following conditions are met;


    • High voltage from hybrid vehicle control ECU assembly is unavailable

    • Air conditioning refrigerant pressure malfunction

    • Compressor with motor assembly malfunction

  • Detection time: Present malfunction

  • Harness or connector

  • Compressor with motor assembly

  • Hybrid control system

  • CAN communication system

 Memorized

WIRING DIAGRAM

B004ANJE02

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 (HYBRID CONTROL SYSTEM)


    1. Check if air conditioning system and hybrid control system DTCs are output.

      Click here


      Powertrain > Hybrid Control > Trouble Codes
      Result
      Result Proceed to
      DTC is not output A
      DTC is output B

    B

    GO TO HYBRID CONTROL SYSTEM Click here

    A

  3. PERFORM ACTIVE TEST USING GTS (COMPRESSOR TARGET SPEED)


    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 Restrict Condition
      Compressor Target Speed Compressor with motor assembly

      Min.: 0

      Max.: 7500

      		 Perform this test when the power switch on (READY)

      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