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 output 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 control system

  • CAN communication system

WIRING DIAGRAM

A01GWR8E04

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK DTC (CAN COMMUNICATION SYSTEM)


    1. Use the intelligent tester to check if the CAN communication system is functioning normally.

      Result
      Result Proceed to
      CAN DTC is not output A
      CAN DTC is output (for LHD) B
      CAN DTC is output (for RHD) C

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    C

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. CHECK DTC


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

      Result
      Result Proceed to
      Only DTC B1473 is output A
      DTCs B1473 and P3108-538 are output simultaneously (B1498 is not output)
      DTCs B1473 and B1498 are output simultaneously (P3108-538 is not output) B
      DTCs B1473, B1498 and P3108-538 are output simultaneously
      DTCs other than P3108-538 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)


    1. A01GWXVE03

      Disconnect the E58 hybrid vehicle control ECU connector.

    2. Disconnect the E59 compressor with motor assembly connector.

      CAUTION:

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

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

      Standard resistance
      Tester Connection Condition Specified Condition
      E59-2 (STB1) - E58-31 (STB) Always Below 1 Ω
      E58-31 (STB) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT COMPRESSOR WITH MOTOR ASSEMBLY


    1. A01GXV4E03

      Disconnect the E58 hybrid vehicle control ECU connector.

    2. Reconnect the E59 compressor with motor assembly connector.

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

      Standard voltage
      Tester Connection Condition Specified Condition
      E58-31 (STB) - Body ground Power switch ON (IG) 11 to 14 V
      Power switch OFF Below 1 V

    NG

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY Click here

    OK

    REPLACE HYBRID VEHICLE CONTROL ECU Click here