AIR CONDITIONING SYSTEM, Diagnostic DTC:B1473/73

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

DESCRIPTION

The inverter activation signal is sent to the compressor with motor assembly from the hybrid vehicle control ECU. Compressor control is stopped and this DTC is stored if there is an open or short in the signal circuit.


DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	Note
B1473/73	A/C Inverter Start-up Signal System Malfunction	Open or short in A/C inverter start-up signal system	Harness or connector between hybrid vehicle control ECU and compressor with motor assembly Compressor with motor assembly Hybrid vehicle control ECU Hybrid control system CAN communication system	-	-

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION:

Wear insulated gloves and pull out the service plug grip before inspection as procedures may require disconnecting high-voltage connectors. Carry the removed service plug in your pocket to prevent other technicians from accidentally reconnecting it while you are servicing the vehicle.
Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is removed.

Note:

After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.
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The hybrid control system and air conditioning system output DTCs separately. Perform troubleshooting for the hybrid control system first if DTCs from these systems are output simultaneously.

PROCEDURE

CHECK CAN COMMUNICATION SYSTEM

Using the GTS, check if the CAN communication system is functioning normally.
- for LHD:Click here
- for RHD:Click here

Result


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

B

GO TO CAN COMMUNICATION SYSTEM

for LHD:Click here
for RHD:Click here

A

CHECK FOR DTC

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

Powertrain > Hybrid Control > Trouble Codes

Body Electrical > Air Conditioner > 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)	A
DTCs B1473/73 and B1498/98 are output simultaneously (P3108 is not output)	B
DTCs B1473/73, B1498/98 and P3108 are output simultaneously	B
DTCs other than P3108 are output for hybrid control system	C

B

GO TO DTC B1498/98

Click here

C

GO TO HYBRID CONTROL SYSTEM

Click here

A

CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - COMPRESSOR WITH MOTOR ASSEMBLY)

CAUTION:

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

Disconnect the A66 hybrid vehicle control ECU connector.
Disconnect the B108 compressor with motor assembly connector.

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

Standard Resistance


Tester Connection	Condition	Specified Condition
A66-11 (STB) - B108-4 (STBI)	Always	Below 1 Ω
A66-11 (STB) or B108-4 (STBI) - Body ground	Always	10 kΩ or higher

Result


Proceed to
OK
NG

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

INSPECT COMPRESSOR WITH MOTOR ASSEMBLY

*a	Front view of wire harness connector (to Hybrid Vehicle Control ECU)

Disconnect the hybrid vehicle control ECU connector.

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

Standard Voltage


Tester Connection	Switch Condition	Specified Condition
A66-11 (STB) - Body ground	Power switch on (IG)	11 to 14 V
A66-11 (STB) - Body ground	Power switch off	Below 1 V

Result


Proceed to
OK
NG

OK

REPLACE HYBRID VEHICLE CONTROL ECU

Click here

NG

REPLACE COMPRESSOR WITH MOTOR ASSEMBLY

Click here