DTC B1473/73: A/C Inverter Start-up Signal System Malfunction [11/2016 - ]: Procedure

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

   Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2016 - ]

   Result

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

Result:  2

B 

GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2016 - ] 

Result:  1

A 

See step  2

1. Check if air conditioning system and hybrid control system DTCs are output.

   Refer to DIAGNOSTIC TROUBLE CODE CHART [11/2016 - 10/2017] Refer to DIAGNOSTIC TROUBLE CODE CHART [10/2017 - ]

   Body Electrical > Air Conditioner > Trouble Codes 

   Powertrain > Hybrid Control > Trouble Codes 

   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:  2

B 

GO TO DTC B1498/98. Refer to  DTC B1498/98: Communication Malfunction (A/C Inverter Local) [11/2016 - ]  

Result:  3

C 

GO TO HYBRID CONTROL SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [02/2014 - ] 

Result:  1

A 

See step  3

1. Disconnect the C13 compressor with motor assembly connector.
2. Disconnect the A86 hybrid vehicle control ECU assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   C13-4 (STBI) - A86-11 (STB)	Always	Below 1 Ω
   C13-4 (STBI) or A86-11 (STB) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result:  2

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result:  1

OK 

See step  4

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Connect the C13 compressor with motor assembly connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A86-11 (STB) - Body ground	Power switch on (IG)	11 to 14 V
   A86-11 (STB) - Body ground	Power switch off	Below 1 V

   Result

   Proceed to
   OK
   NG

Result:  1

OK 

REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to  REMOVAL [11/2016 - ] 

Result:  2

NG 

REPLACE COMPRESSOR WITH MOTOR ASSEMBLY. Refer to  REMOVAL [11/2016 - ]