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DTC B2321: Driver Side Door ECU Communication Stop [08/2013 - ]: Procedure

WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DTC OUTPUT 
    1. Clear the DTCs. Refer to DTC CHECK / CLEAR [08/2013 - ] .
    2. Recheck for DTCs.

      Result

      Result Proceed to
      Only DTC B2321 is output. A
      DTC B1206 and B2321 are output simultaneously. B

      HINT: 

      When DTC B1206 and B2321 are output simultaneously, perform troubleshooting for DTC B1206 first.

    B → See step   9 

    A: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY - POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Driver Door)) 
    1. Disconnect the M4 multiplex network master switch connector.
    2. Disconnect the M8 power window regulator motor (for driver door) connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      M4-16 (LIN2) - M8-9 (LIN) Always Below 1 Ω
      M4-16 (LIN2) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  3. INSPECT MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY 
    1. Remove the multiplex network master switch assembly. Refer to REMOVAL [08/2013 - ] .
      GTY406398Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      16 (LIN2) - 17 (LIN1) Always Below 1 Ω
      TEXT IN ILLUSTRATION

      *a Component without harness connected
      (Multiplex Network Master Switch Assembly)

    NG → See step   7 

    OK: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Driver Door) - AUXILIARY BATTERY, BODY GROUND) 
    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      M8-2 (B) - Body ground Power switch off 11 to 14 V
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      M8-1 (GND) - Body ground Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  5. REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Driver Door) 
    1. Replace the power window regulator motor assembly (for driver door). Refer to REMOVAL [08/2013 - ] .

    NEXT: Go to next step 

  6. CHECK DTC OUTPUT 
    1. Clear the DTCs. Refer to DTC CHECK / CLEAR [08/2013 - ] .
    2. Check for DTCs.

      OK

      DTC B2321 is not output.

    NG → See step   8 

    OK → END (POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Driver Door) WAS DEFECTIVE) 

  7. REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY. Refer to  REMOVAL [08/2013 - ] 
  8. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [08/2013 - ] 
  9. GO TO DTC B1206. Refer to  DTC B1206: P/W Master Switch Communication Stop [08/2013 - ]  
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