DTC B1473/73: A/C Inverter Start-up Signal System Malfunction [10/2014 - 10/2015]: Procedure

1. Using the Techstream, check if the CAN communication system is functioning normally.

   Result

   Result	Proceed to
   CAN DTCs are not output	A
   CAN DTCs are output	B

Result: 

B 

GO TO CAN COMMUNICATION SYSTEM 

(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2014 - 10/2015] )

Result: 

A 

See step  2

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

   Result

   Result	Proceed to
   Only DTC B1473/73 is output	A
   DTCs B1473/73 and P3108 are output simultaneously (B1498/98 is not output)
   DTCs B1473/73 and B1498/98 are output simultaneously (P3108 is not output)	B
   DTCs B1473/73, B1498/98 and P3108 are output simultaneously
   DTCs other than P3108 are output for hybrid control system	C

Result: 

B 

GO TO DTC B1498/98 

(Refer to DTC B1498/98: Communication Malfunction (A/C Inverter Local) [10/2014 - 10/2015] )

Result: 

C 

GO TO HYBRID CONTROL SYSTEM 

(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2014 - ] )

Result: 

A 

See step  3

1. Disconnect the A53 power management control ECU connector.
2. Disconnect the B58 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
   A53-20 (STB) - B58-4 (STBI)	Always	Below 1 Ω
   A53-20 (STB) - Body ground	Always	10 kΩ or higher

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Reconnect the B58 compressor with motor assembly connector.
2. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A53-20 (STB) - Body ground	Power switch on (IG)	11 to 14 V
   A53-20 (STB) - Body ground	Power switch off	Below 1 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Power Management Control ECU)

Result: 

OK 

REPLACE POWER MANAGEMENT CONTROL ECU 

(Refer to REMOVAL [10/2014 - 10/2015] )

Result: 

NG 

REPLACE COMPRESSOR WITH MOTOR ASSEMBLY 

(Refer to REMOVAL [10/2014 - ] )