LIN COMMUNICATION SYSTEM, Diagnostic DTC:B2323

DTC Code DTC Name
B2323 Rear Door RH ECU Communication Stop

DESCRIPTION

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

DTC Code

DTC Detection Condition

Trouble Area

B2323

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

  • Rear door window regulator assembly RH

  • Main body ECU (instrument panel junction block assembly)

  • Harness or connector

WIRING DIAGRAM

B173719E91

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 rear door window regulator RH and main body ECU (instrument panel junction block assembly) stops, DTC B2325 is also stored.

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 B2323 is output

      A

      DTC B2323 is not output

      B

    USE SIMULATION METHOD TO CHECK

    (Click here)

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

    1. U123801E02

      Disconnect the H79 ECU connector.

    2. Disconnect the L3 regulator connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      H79-23 (LIN2) - L3-9 (LIN)

      Always

      Below 1 Ω

      H79-23 (LIN2) - Body ground

      Always

      10 kΩ or higher
      Table 2. Text in Illustration

      *1

      Front view of wire harness connector

      (to Main Body ECU)

      *2

      Front view of wire harness connector

      (to Rear Door Window Regulator RH)

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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

    1. U123805E02

      Disconnect the L3 regulator connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      L3-1 (GND) - Body ground

      Always

      Below 1 Ω

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      L3-2 (B) - Body ground

      Always

      11 to 14 V
      Table 3. Text in Illustration

      *1

      Front view of wire harness connector

      (to Rear Door Window Regulator RH)

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. REPLACE REAR DOOR WINDOW REGULATOR ASSEMBLY RH

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

    2. Clear the DTCs (Click here).

  6. CHECK FOR DTC

    1. Check for DTCs (Click here).

      Table 4. Result

      Result

      Proceed to

      DTC B2323 is not output

      A

      DTC B2323 is output

      B

    END (REAR DOOR WINDOW REGULATOR RH IS DEFECTIVE)

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)