A/C Inverter Start-up Signal System Malfunction - Air Conditioning System

AIR CONDITIONING: 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 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.

NOTICE:
This circuit uses both CAN and multiplex communication. Before performing the inspection, check that the CAN and multiplex communication systems are functioning normally.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK FOR DTC

(a) Clear the DTC DTC Check / Clear.

(b) 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 How To Proceed With Troubleshooting

B -- GO TO DTC B1498 B1498
A -- Continue to next step.

2. CHECK WIRE HARNESS (HYBRID VEHICLE CONTROL ECU - COMPRESSOR)

(a) Disconnect the E84 hybrid vehicle control ECU connector.





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

(b) Disconnect the E85 compressor connector.

(c) Measure the resistance of the wire harness side connectors.

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. INSPECT COMPRESSOR ASSEMBLY

(a) Reconnect the E85 compressor connector.





(b) Disconnect the E84 hybrid vehicle control ECU.

(c) Measure the voltage of the hybrid vehicle control ECU.

Standard voltage:





OK -- REPLACE HYBRID VEHICLE CONTROL ECU
NG -- Continue to next step.

4. REPLACE COMPRESSOR ASSEMBLY

NEXT -- Continue to next step.

5. CHECK FOR DTC

(a) Clear the DTC DTC Check / Clear.

(b) Check for the DTC again DTC Check / Clear.

Result





B -- END

A -- REPLACE HYBRID VEHICLE CONTROL ECU