B1473/73

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.	Harness or connector between hybrid vehicle control ECU and w/ motor compressor assembly w/ Motor compressor assembly Hybrid control system

WIRING DIAGRAM

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)

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

2. 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

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

2. 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