DTC    B1473/73    A/C Inverter Start-up Signal System Malfunction

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DESCRIPTION

The inverter activation signal is sent to the w/ motor compressor 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 Detecting Condition
Trouble Area
B1473/73
Open or short in A/C inverter start-up signal system.
  1. Harness or connector between hybrid vehicle control ECU and w/ motor compressor assembly
  2. w/ Motor compressor assembly
  3. Hybrid control system

WIRING DIAGRAM


E109280E03


INSPECTION PROCEDURE

NOTICE:
If DTC B1473/73 and B1498/98 (inverter local communication problem) are output simultaneously, perform inspection for B1498/98 first by following the flow chart.

1.CHECK DIAGNOSTIC TROUBLE CODE

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

    OK:
    DTCs are not output in the hybrid control system.



NG
GO TO HYBRID CONTROL SYSTEM
OK


2.CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - W/MOTOR COMPRESSOR ASSEMBLY)


    E109278E05

  1. Disconnect the connectors from the hybrid vehicle control ECU and the w/ motor compressor assembly.

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

    Resistance:
    Tester connection
    (Symbols)
    		Condition
    		Specified condition
    C18-4 (STB) - H33-18 (STB)
    		Always
    		Below 1 Ω
    C18-4 (STB) - Body ground
    		Always
    		10 kΩ or higher

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



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT W/MOTOR COMPRESSOR ASSEMBLY


    E109293E03

  1. Reconnect the connector to the w/ motor compressor assembly.

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

    Voltage:
    Tester connection
    (Symbols)
    		Condition
    		Specified condition
    H33-18 (STB) - Body ground
    		Ignition switch ON
    		10 to 14 V
    H33-18 (STB) - Body ground
    		Ignition switch OFF
    		Below 1 V



NG
REPLACE W/MOTOR COMPRESSOR ASSEMBLY
OK

GO TO HYBRID CONTROL SYSTEM