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Home >> Lexus >> 2007 >> LS 460L >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Multiplex Communication >> Lin Communication System >> DTC B1206 P/W Master Switch Communication Stop >> Inspection Procedure

Inspection Procedure

NOTE: When using the intelligent tester (with CAN VIM) or Techstream with the engine switch off to troubleshoot:
Connect the intelligent tester (with CAN VIM) or Techstream to the vehicle, and turn a courtesy switch on and off at 1.5 second intervals until communication between the tester and vehicle begins.

HINT:

DTC B2325 is output when the communication between all of the following components and main body ECU stops.

  1. CLEAR DTC 
    1. Delete the DTC (see DTC CHECK / CLEAR  ).
  2. CHECK FOR DTC 
    1. Recheck for DTC (see DTC CHECK / CLEAR  ).

      Result: 

      RESULT

      Result Proceed to
      DTC B1206 output reoccurs A
      DTC B1206 output does not reoccur B

    B: USE SIMULATION METHOD TO CHECK  (See HOW TO PROCEED WITH TROUBLESHOOTING )

    A: GO TO NEXT STEP 

  3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - MASTER SWITCH) 
    1. Disconnect the L11 ECU connector.
    2. Disconnect the N13 switch connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      MAIN BODY ECU - MASTER SWITCH

      Tester Connection Condition Specified Condition
      L11-10(LIN2)-N13-17 (LIN1) Always Below 1 Ω
      L11-10(LIN2)or N13-17 (LIN1) - Body ground Always 10 kΩ or higher
      Fig 1: Identifying L11 ECU And N13 Switch Connectors
      G04946964Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: GO TO NEXT STEP 

  4. CHECK MASTER SWITCH ASSEMBLY (BATTERY VOLTAGE AND GROUND) 
    1. Disconnect the N13 switch connector.
    2. Measure the resistance and voltage according to the value(s) in the table below.

      Standard resistance 

      MASTER SWITCH ASSEMBLY (BATTERY VOLTAGE AND GROUND) RESISTANCE

      Tester Connection Condition Specified Condition
      N13-12 (GND) -Body ground Always Below 1 Ω

      Standard voltage 

      MASTER SWITCH ASSEMBLY (BATTERY VOLTAGE AND GROUND) VOLTAGE

      Tester Connection Condition Specified Condition
      N13-11 (B)-Body ground Always 11 to 14 V
      Fig 2: Identifying N13 Switch Connector
      G04946965Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: GO TO NEXT STEP 

  5. REPLACE MASTER SWITCH ASSEMBLY 
    1. Temporarily replace the master switch with a new or normally functioning one (see REMOVAL ).
    2. Delete the DTC (see DTC CHECK / CLEAR  ).
  6. CHECK FOR DTC 
    1. Recheck for DTC (see DTC CHECK / CLEAR  ).

      Result: 

      RESULT

      Result Proceed to
      DTC B1206 output reoccurs B
      DTC B1206 output does not reoccur A

    B: REPLACE MAIN BODY ECU 

    A: END (MASTER SWITCH IS DEFECTIVE) 

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