AIR CONDITIONING SYSTEM, Diagnostic DTC:B1498

DTC Code DTC Name
B1498 Communication Malfunction (A/C Inverter Local)

DESCRIPTION

The hybrid vehicle control ECU assembly and compressor with motor assembly communicate via a direct line. Compressor control is stopped and this DTC is stored if communication information is cut off or abnormal information occurs.

This DTC is also detected if high-voltage power supplied from the inverter with converter assembly to the compressor control circuit is shut off.

This DTC will be stored as a history DTC.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B1498 Communication Malfunction (A/C Inverter Local)

  • Diagnosis condition: Power switch on (READY)

  • Malfunction status: Error or open in communication line between the hybrid vehicle control ECU and compressor with motor assembly or high-voltage power source shut off

  • Harness or connector

  • Hybrid vehicle control ECU

  • Compressor with motor assembly

  • Air conditioning wire

  • CAN communication system

  • Hybrid control system

 Memorized

WIRING DIAGRAM

B004ANJE02

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


  • Inspect the fuses for circuits related to this system before performing the following procedure.

  • 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.

    Click here

  • 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.

  • Depending on the timing of the power supply to the 12 V power supply circuit and high-voltage circuit when the power switch is turned on (READY), an abnormal information signal may be output, causing this DTC to be stored. If the output DTC is a code that was memorized in the past, check the fuses and wire harnesses. If there is no malfunction, clear the DTC.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Using the GTS, check if the CAN communication system is functioning normally.

      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 Click here

    A

  2. CHECK FOR DTC (HYBRID CONTROL SYSTEM)


    1. Check if hybrid control system DTCs are output.

      Click here


      Powertrain > Hybrid Control > Trouble Codes
      Result
      Result Proceed to
      DTCs are not output A
      DTCs are output B

    B

    GO TO HYBRID CONTROL SYSTEM Click here

    A

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


    1. Disconnect the G21 compressor with motor assembly connector.

    2. Disconnect the A21 hybrid vehicle control ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G21-3 (DOUT) - A21-12 (LIN3) Always Below 1 Ω
      G21-3 (DOUT) - A21-12 (LIN3) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

    CAUTION:

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


    1. B004BXSC02
      *a

      Front view of wire harness connector

      (to Compressor with Motor Assembly)

      Disconnect the compressor with motor assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G21-2 (GND) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G21-1 (IG1) - Body ground Power switch on (IG) 11 to 14 V
      Power switch off Below 1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT EV FUSE

    CAUTION:

    Be sure to wear insulated gloves.


    1. Turn the power switch off.

    2. Remove the service plug grip.

      Click here

      CAUTION:

      Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is removed.

      Note

      After removing the service plug grip, turning the power switch on (READY) may cause a malfunction. Do not turn the power switch on (READY) with the service plug grip removed.

    3. Remove the connector cover assembly.

      Click here

      Note

      Be sure to prevent foreign matter or water from entering the inverter with converter assembly.

    4. B004B4ZC01
      1a EV Fuse

      Check that bolts A and B are tightened securely.

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

      Standard Resistance

      Tester Item

      (Tester Connection)

      		 Condition Specified Condition

      EV fuse

      (A - B)

      		 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE EV FUSE Click here

    OK

  6. CHECK AIR CONDITIONING WIRE (COMPRESSOR WITH MOTOR ASSEMBLY - INVERTER WITH CONVERTER ASSEMBLY)

    CAUTION:

    Be sure to wear insulated gloves.


    1. Disconnect the g1 compresser with motor assembly connector.

      Click here

    2. Disconnect the air conditioning wire from the inverter with converter assembly.

      Click here

      Note

      Be sure to prevent foreign matter or water from entering the inverter with converter assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A38-1 (ACPE) - g1-1 (PE) Always Below 1 Ω
      A38-2 (ACPB) - g1-2 (PB) Always Below 1 Ω
      A38-1 (ACPE) or g1-1 (PE) - Other terminals and body ground Always 10 kΩ or higher
      A38-2 (ACPB) or g1-2 (PB) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY Click here

    NG

    REPLACE AIR CONDITIONING WIRE Click here