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
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:





C -- GO TO CAN COMMUNICATION SYSTEM Diagnosis System

B -- GO TO CAN COMMUNICATION SYSTEM Diagnosis System
A -- Continue to next step.

2. CHECK DTC OUTPUT

(a) Using the Techstream, check if the hybrid control system is functioning normally.

Result:





C -- GO TO HYBRID CONTROL SYSTEM Hybrid Control System

B -- GO TO DTC B1498/98 Air Conditioning System (for Manual Air Conditioning System)
A -- Continue to next step.

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

(a) Disconnect the A65 hybrid vehicle control ECU connector.

(b) Disconnect the B48 compressor connector.





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. CHECK HARNESS AND CONNECTOR (COMPRESSOR WITH MOTOR ASSEMBLY - BODY GROUND)

(a) Reconnect the B48 compressor connector.

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





Standard voltage:





NG -- REPLACE COMPRESSOR WITH MOTOR ASSEMBLY Removal

OK -- REPLACE HYBRID VEHICLE CONTROL ECU Removal