B1473

AIR CONDITIONING: AIR CONDITIONING SYSTEM: B1473: A/C Inverter Start-up Signal System Malfunction

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

DESCRIPTION

The inverter activation signal is sent to the A/C inverter from the hybrid control ECU. Compressor control is stopped and the DTC is output if there is an open or short in the signal circuit.





NOTE: The A/C inverter is integrated with the inverter with converter. It is necessary to replace the PCU box if the A/C inverter (inverter with converter) needs to be replaced because the A/C inverter (inverter with converter) cannot be replaced alone.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK DIAGNOSTIC TROUBLE CODE
(a) Check if DTCs for the hybrid control system are output using Techstream.
OK:
DTCs are not output in the hybrid control system.
NG -- GO TO HYBRID CONTROL SYSTEM
OK -- Continue to next step.

2. CHECK WIRE HARNESS (HYBRID CONTROL ECU - A/C INVERTER)




(a) Disconnect the H15 ECU connector.
(b) Disconnect the I11 inverter connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- REPLACE A/C INVERTER