AIR CONDITIONING SYSTEM, Diagnostic DTC:B1498/98

DTC Code DTC Name
B1498/98 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
B1498/98 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

  • IG-B Relay

  • Certification ECU (smart key ECU 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

B006ITUE02

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.

  • The air conditioning system uses the CAN communication system. Inspect the communication functions by following How to Proceed with Troubleshooting. Troubleshoot the air conditioning system after confirming that the communication systems are functioning properly.

    Click here

  • Before replacing the hybrid vehicle control ECU and certification ECU (smart key ECU assembly), refer to Service Bulletin.

PROCEDURE


  1. CHECK FOR DTC


    1. Check if hybrid control system DTCs are output.

      Click here


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

    B

    CHECK FOR DTC (AIR CONDITIONING SYSTEM) Click here

    A

  2. INSPECT IG-B RELAY


    1. Remove the IG-B relay.

    2. Inspect the IG-B relay.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE IG-B RELAY

    OK

  3. CHECK HARNESS AND CONNECTOR (IG-B RELAY - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))


    1. Disconnect the N55 certification ECU (smart key ECU assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (IG-B relay) - N55-2 (IGBD) Always Below 1 Ω
      2 (IG-B relay) or N55-2 (IGBD) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    B006HHIC10
    *a

    Component with harness connected

    (Certification ECU (Smart Key ECU Assembly))

    1. Reconnect the N55 certification ECU (smart key ECU assembly) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      N55-2 (IGBD) - Body ground Power switch on (ACC) → Power switch on (IG) 1 V or less → 8.5 V or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    OK

  5. CHECK HARNESS AND CONNECTOR (IG-B RELAY - POWER SOURCE, GROUND)


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

      Standard Voltage
      Tester Connection Condition Specified Condition
      3 (IG-B relay) - Body ground Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (IG-B relay) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (COMPRESSOR WITH MOTOR ASSEMBLY - POWER SOURCE, GROUND)

    CAUTION:

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


    1. Install the IG-B relay.

    2. Disconnect the C12 compressor with motor assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      C12-1 (IG1) - Body ground Power switch on (IG) 11 to 14 V

    4. 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

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


    1. Disconnect the A41 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
      A41-8 (LIN3) - C12-3 (DOUT) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. INSPECT AIR CONDITIONING WIRE

    CAUTION:

    Be sure to wear insulated gloves.


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

      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
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT AIR CONDITIONING WIRE Click here

    OK

  9. 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
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY Click here

    NG

    REPLACE AIR CONDITIONING WIRE Click here

  10. 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

  11. CHECK FOR DTC (AIR CONDITIONING SYSTEM)


    1. Disconnect the C19 battery state sensor assembly connector.

    2. Check if air conditioning system DTCs are output.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      Result
      Result Proceed to
      DTC B1498/98 is not output A
      DTC B1498/98 is output B

    A

    REPLACE BATTERY STATE SENSOR ASSEMBLY Click here

    B

  12. CHECK FOR DTC (HYBRID CONTROL SYSTEM)


    1. Reconnect 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.

      Click here


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

    A

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY Click here

    B

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


    1. Disconnect the A41 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
      A41-8 (LIN3) - C12-3 (DOUT) Always Below 1 Ω
      A41-8 (LIN3) - C19-2 (LIN) Always Below 1 Ω
      A41-8 (LIN3) or C12-3 (DOUT) - Body ground Always 10 kΩ or higher
      A41-8 (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