AIR CONDITIONING SYSTEM, Diagnostic DTC:B1498

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

DESCRIPTION

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

This DTC is also detected if high-voltage electricity 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)

  • Error or open in communication line between the hybrid vehicle control ECU and compressor with motor assembly

  • High-voltage power source shut off

  • Harness or connector between compressor with motor assembly and body ground

  • Harness or connector between hybrid vehicle control ECU and compressor with motor assembly, battery state sensor assembly

  • Hybrid vehicle control ECU

  • Compressor with motor assembly

  • Air conditioning wire (harness or connector between compressor with motor assembly and inverter with converter assembly)

  • CAN communication system

  • Hybrid control system

 Memorized

WIRING DIAGRAM

B004OX8E05

CAUTION / NOTICE / HINT

CAUTION:


  • Before inspecting the high-voltage system, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.

  • 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 for both 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.

      Tech Tips

      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


    1. Check if hybrid control system DTCs are output.


      Powertrain > Hybrid Control > Trouble Codes
      Result
      Result Proceed to
      Both P058A01 and P162B87 are not output A
      P058A01 and P162B87 are output B

    B

    CHECK FOR DTC Click here

    A

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

    CAUTION:

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


    1. Disconnect the C12 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
      C12-2 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (COMPRESSOR WITH MOTOR ASSEMBLY - IG CIRCUIT, GROUND)


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

      Standard Voltage
      Tester Connection Condition Specified Condition
      C12-1 (IG1) - C12-2 (GND) Power switch on (IG) 11 to 14 V
      C12-1 (IG1) - C12-2 (GND) Power switch off Below 1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the A50 hybrid vehicle control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A50-8 (LIN3) - C12-3 (DOUT) Always Below 1 Ω
      A50-8 (LIN3) or C12-3 (DOUT) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT AIR CONDITIONING WIRE

    CAUTION:

    Be sure to wear insulated gloves.


    1. Disconnect the T1 and T2 air conditioning wire connectors.

      Tech Tips

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T1-2 (PB) - T2-1 (ACPB) Always Below 1 Ω
      T1-2 (PB) or T2-1 (ACPB) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT AIR CONDITIONING WIRE Click here

    OK

  7. INSPECT AIR CONDITIONING WIRE

    CAUTION:

    Be sure to wear insulated gloves.


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T1-1 (PE) - T2-2 (ACPE) Always Below 1 Ω
      T1-1 (PE) or T2-2 (ACPE) - 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

  8. INSPECT AIR CONDITIONING WIRE

    CAUTION:

    Be sure to wear insulated gloves.


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T1-2 (PB) - 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

  9. CHECK FOR DTC


    1. Disconnect the C19 battery state sensor assembly connector.

    2. Check if air conditioning system DTCs are output.


      Body Electrical > Air Conditioner > Trouble Codes
      Result
      Result Proceed to
      B1498 is not output A
      B1498 is output B

    A

    REPLACE BATTERY STATE SENSOR ASSEMBLY Click here

    B

  10. CHECK FOR DTC


    1. Connect the C19 battery state sensor assembly connector.

    2. Disconnect the C12 compressor with motor assembly connector.

    3. Check if hybrid control system DTCs are output.


      Powertrain > Hybrid Control > Trouble Codes
      Result
      Result Proceed to
      Both P058A01 and P162B87 are not output A
      P058A01 and P162B87 are output B

    A

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY Click here

    B

  11. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - COMPRESSOR WITH MOTOR ASSEMBLY, BATTERY STATE SENSOR ASSEMBLY)


    1. Disconnect the A50 hybrid vehicle control ECU connector.

    2. Disconnect the C19 battery state sensor assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A50-8 (LIN3) - C12-3 (DOUT) Always Below 1 Ω
      A50-8 (LIN3) - C19-2 (LIN) Always Below 1 Ω
      A50-8 (LIN3) or C12-3 (DOUT) - Body ground Always 10 kΩ or higher
      A50-8 (LIN3) or C19-2 (LIN) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR