LIN COMMUNICATION SYSTEM, Diagnostic DTC:B2321

DTC Code DTC Name
B2321 Driver Side Door ECU Communication Stop

DESCRIPTION

This DTC is stored when LIN communication between the front door window regulator LH*1 or RH*2 and main body ECU (instrument panel junction block assembly) stops for 10 seconds or more.

  • *1: for LHD

  • *2: for RHD

DTC Code

DTC Detection Condition

Trouble Area

B2321

No communication between the front door window regulator LH*1 or RH*2 and main body ECU (instrument panel junction block assembly) for 10 seconds or more.

  • Front door window regulator assembly LH*1

  • Front door window regulator assembly RH*2

  • Main body ECU (instrument panel junction block assembly)

  • Harness or connector

  • *1: for LHD

  • *2: for RHD

WIRING DIAGRAM

E182544E03

CAUTION / NOTICE / HINT

Note:

  • When using the intelligent tester with the ignition switch off to troubleshoot:

    Connect the intelligent tester to the vehicle, and turn a courtesy light switch on and off at 1.5 second intervals until communication between the intelligent tester and vehicle begins.

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

Tip:

When communication between the front door window regulator LH*1 or RH*2 and main body ECU (instrument panel junction block assembly) stops, DTC B2325 is also stored.

  • *1: for LHD

  • *2: for RHD

PROCEDURE

  1. CLEAR DTC

    1. Clear the DTCs (Click here).

  2. CHECK FOR DTC

    1. Check for DTCs (Click here).

      Table 1. Result

      Result

      Proceed to

      DTC B2321 is output

      A

      DTC B2321 is not output

      B

    USE SIMULATION METHOD TO CHECK

    (Click here)

  3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - FRONT DOOR WINDOW REGULATOR)

    1. U123799E02

      Disconnect the H79 ECU connector.

    2. Disconnect the K8*1 or J6*2 regulator connector.

      • *1: for LHD

      • *2: for RHD

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

      Standard Resistance

      for LHD

      Tester Connection

      Condition

      Specified Condition

      H79-23 (LIN2) - K8-9 (LIN)

      Always

      Below 1 Ω

      H79-23 (LIN2) - Body ground

      Always

      10 kΩ or higher

      for RHD

      Tester Connection

      Condition

      Specified Condition

      H79-23 (LIN2) - J6-9 (LIN)

      Always

      Below 1 Ω

      H79-23 (LIN2) - Body ground

      Always

      10 kΩ or higher
      Table 2. Text in Illustration

      *1

      for LHD

      *2

      for RHD

      *3

      Front view of wire harness connector

      (to Main Body ECU)

      *4

      Front view of wire harness connector

      (to Front Door Window Regulator LH [for LHD])

      (to Front Door Window Regulator RH [for RHD])

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. CHECK HARNESS AND CONNECTOR (FRONT DOOR WINDOW REGULATOR - BATTERY AND BODY GROUND)

    1. U123803E02

      Disconnect the K8*1 or J6*2 regulator connector.

      • *1: for LHD

      • *2: for RHD

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

      Standard Resistance

      for LHD

      Tester Connection

      Condition

      Specified Condition

      K8-1 (GND) - Body ground

      Always

      Below 1 Ω

      for RHD

      Tester Connection

      Condition

      Specified Condition

      J6-1 (GND) - Body ground

      Always

      Below 1 Ω

      Standard Voltage

      for LHD

      Tester Connection

      Condition

      Specified Condition

      K8-2 (B) - Body ground

      Always

      11 to 14 V

      for RHD

      Tester Connection

      Condition

      Specified Condition

      J6-2 (B) - Body ground

      Always

      11 to 14 V
      Table 3. Text in Illustration

      *1

      for LHD

      *2

      for RHD

      *3

      Front view of wire harness connector

      (to Front Door Window Regulator LH [for LHD])

      (to Front Door Window Regulator RH [for RHD])

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. REPLACE FRONT DOOR WINDOW REGULATOR ASSEMBLY

    1. Temporarily replace the front door window regulator LH*1 or RH*2 with a new or normally functioning one (Click here).

      • *1: for LHD

      • *2: for RHD

    2. Clear the DTCs (Click here).

  6. CHECK FOR DTC

    1. Check for DTCs (Click here).

      Table 4. Result

      Result

      Proceed to

      DTC B2321 is not output

      A

      DTC B2321 is output

      B

    END (FRONT DOOR WINDOW REGULATOR IS DEFECTIVE)

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)