A/C Inverter Start-up Signal System Malfunction - Air Conditioning System (for Manual Air Conditioning System)

AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Manual Air Conditioning System): B1473/73: A/C Inverter Start-up Signal System Malfunction

DTC 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 the DTC is output if there is an open or short in the signal circuit.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK CAN COMMUNICATION SYSTEM
(a) Using the Techstream, check if the CAN communication system is functioning normally.
Result:






B -- GO TO CAN COMMUNICATION SYSTEM
A -- Continue to next step.
2. CHECK FOR DTC
(a) Check if DTCs for the air conditioning system and the hybrid control system are output using the Techstream.
Result:






C -- GO TO HYBRID CONTROL SYSTEM
B -- GO TO DTC B1498/98
A -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - COMPRESSOR WITH MOTOR ASSEMBLY)
(a) Disconnect the connector from the hybrid vehicle control ECU.





(b) Disconnect the connector from the compressor with motor assembly.
CAUTION: Do not disconnect the connector on the high-voltage side.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. INSPECT COMPRESSOR WITH MOTOR ASSEMBLY
(a) Reconnect the connector to the compressor with motor assembly.





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






NG -- REPLACE COMPRESSOR WITH MOTOR ASSEMBLY
OK -- REPLACE HYBRID VEHICLE CONTROL ECU