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 hybrid vehicle control ECU. Compressor control is stopped and the DTC is stored if there is an open or short in the signal circuit.

DTC No. DTC Detection Condition Trouble Area
B1473/73 Open or short in A/C inverter start-up signal system

  • 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

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


  • 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


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

      Result
      Result Proceed to
      Only DTC B1473 is output A
      DTCs B1473 and P3108 are output simultaneously (B1498 is not output)
      DTCs B1473 and B1498 are output simultaneously (P3108 is not output) B
      DTCs B1473, B1498 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 (HYBRID VEHICLE CONTROL ECU - COMPRESSOR WITH MOTOR ASSEMBLY)

    CAUTION:

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


    1. Disconnect the A27 hybrid vehicle control ECU connector.

    2. Disconnect the C22 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) - C22-4 (STBI) Always Below 1 Ω
      A27-11 (STB) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT COMPRESSOR WITH MOTOR ASSEMBLY


    1. Reconnect the C22 compressor with motor assembly connector.

    2. A004FU0E02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Hybrid Vehicle 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 Ignition switch ON (IG) 11 to 14 V
      A27-11 (STB) - Body ground Ignition switch off Below 1 V

    OK

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

    NG

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY Click here