AIR CONDITIONING SYSTEM, Diagnostic DTC:B1477/77

DTC Code DTC Name
B1477/77 A/C Inverter Low Voltage Power Resource System Malfunction

DESCRIPTION

The compressor with motor assembly monitors the control power voltage in the circuit. It stops the compressor circuit and stores the DTC B1477/77 when the monitored voltage is outside the specified range.

This DTC will be stored as a history DTC. Compressor control may not resume unless the power switch is turned off.

DTC Code DTC Detection Condition Trouble Area
B1477/77 An open or short to ground in the inverter control power voltage circuit.

  • Compressor with motor assembly

  • CAN communication system

INSPECTION PROCEDURE

Note

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 Click here.

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check the DTCs Click here.

      OK
      DTC B1477/77 is not output

    NG

    CHECK CAN COMMUNICATION SYSTEM Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  2. CHECK CAN COMMUNICATION SYSTEM


    1. Use the GTS 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

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY Click here