LIN COMMUNICATION SYSTEM, Diagnostic DTC:B2321, B2325

DTC Code DTC Name
B2321 Lost Communication with Driver Door Power Window ECU
B2325 LIN Communication Bus Malfunction

DESCRIPTION

B2321 is stored when the communication between the power window regulator master switch assembly and the main body ECU (network gateway computer) stops for 10 seconds or more.

The main body ECU (network gateway computer) monitors communication between all the ECUs connected to the door LIN bus. When the main body ECU (network gateway computer) detects errors in communication with all the ECUs connected to the door LIN bus at 2.6-second intervals and 3 times in a row, DTC B2325 will be stored.

DTC No. DTC Detection Condition Trouble Area
B2321 Lost communication between the multiplex network master switch assembly and the main body ECU (network gateway computer).

  • Power window regulator master switch assembly

  • Main body ECU (network gateway ECU)

  • Harness or connector
B2325 The main body ECU (network gateway computer) detects errors in door LIN bus communication lines at 2.6-second intervals and 3 times in a row.

  • Power window regulator master switch assembly

  • Main body ECU (network gateway ECU)

  • Harness or connector

WIRING DIAGRAM

A004HE9E04

CAUTION / NOTICE / HINT

Note


  • When using the GTS with the ignition switch off to troubleshoot:

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

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

Tech Tips

When communication between the power window regulator master switch assembly and the main body ECU (network gateway ECU) stops, DTC B2325 is also stored.

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B2321 or B2325 is output A
      DTC B2321 or B235 is not output B

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

  3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (NETWORK GATEWAY ECU) - POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY)


    1. Disconnect the D5 main body ECU (network gateway ECU) connector.

    2. Disconnect the F6*1 or E8*2 power window regulator master switch assembly connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      D5-4 (LIN) - F6-11 (LIN)*1 Always Below 1 Ω
      D5-4 (LIN) - E8-11 (LIN)*2
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      D5-4 (LIN) or F6-11 (LIN) - Body ground*1 Always 10 kΩ or higher
      D5-4 (LIN) or E8-11 (LIN) - Body ground*2

      *1 : for RHD

      *2 : for LHD


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

    A004KD4E02
    Text in Illustration
    *a

    Front view of wire harness connector

    (to Power Window Regulator Master Switch Assembly (for RHD))*1
    *b

    Front view of wire harness connector

    (to Power Window Regulator Master Switch Assembly (for LHD))*2

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F6-5 (GND) - Body ground*1 Always Below 1 Ω
      E8-5 (GND) - Body ground*2

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      F6-12 (+B) - Body ground*1 Always 11 to 14 V
      E8-12 (+B) - Body ground*2

      *1 : for RHD

      *2 : for LHD


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    OK

  5. REPLACE POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY


    1. Temporarily replace the power window regulator master switch assembly with a new or normally functioning one Click here.


    NEXT

  6. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  7. CHECK FOR DTC


    1. Check for DTCs Click here.

      OK
      DTC B2321 or B2325 is not output.

    OK

    END (POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY WAS DEFECTIVE)

    NG

    REPLACE MAIN BODY ECU (NETWORK GATEWAY ECU) Click here