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Home >> Lexus >> 2008 >> LX 570 >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> Networking >> Lin Communication System >> DTC B1273 Sliding Roof ECU Communication Stop >> Inspection Procedure

Inspection Procedure

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

HINT:

DTC B2325 is stored when the communication between the sliding roof ECU and main body ECU (cowl side junction block LH) stops.

  1. CLEAR DTC 
    1. Clear the DTC (See DTC CHECK / CLEAR ).
  2. CHECK FOR DTC 
    1. Recheck for DTCs (See DTC CHECK / CLEAR ).

    Result 

    RESULT CHART

    Result Proceed to
    DTC B1273 is output A
    DTC B1273 is not output B

    B: USE SIMULATION METHOD TO CHECK  (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE )

    A: Go to next Step 

  3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - SLIDING ROOF ECU) 
    1. Disconnect the E3 and R5 ECU connectors.
    2. Measure the resistance and voltage according to the value (s) in the tables below.

    Standard Resistance 

    TESTER CONNECTION SPECIFIED CONDITION CHART

    Tester Connection Condition Specified Condition
    E3-10 (LIN2) - R5-4 (MPX1) Always Below 1 Ω
    E3-10 (LIN2) or R5-4 (MPX1) - Body ground Always 10 kΩ or higher

    Standard Voltage 

    TESTER CONNECTION SPECIFIED CONDITION CHART

    Tester Connection Condition Specified Condition
    R5-4 (MPX1) - Body ground Always Below 1 V

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 1: Checking Harness And Connector (Main Body ECU - Sliding Roof ECU)
    G05764900Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next Step 

  4. CHECK SLIDING ROOF ECU (BATTERY VOLTAGE AND BODY GROUND) 
    1. Disconnect the R5 ECU connector.
    2. Measure the resistance and voltage according to the value (s) in the tables below.

    Standard Resistance 

    TESTER CONNECTION SPECIFIED CONDITION CHART

    Tester Connection Condition Specified Condition
    R5-2 (E) - Body ground Always Below 1 Ω

    Standard Voltage 

    TESTER CONNECTION SPECIFIED CONDITION CHART

    Tester Connection Condition Specified Condition
    R5-1 (B) - Body ground Always 11 to 14 V

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 2: Checking Sliding Roof ECU (Battery Voltage And Body Ground)
    G05639355Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next Step 

  5. REPLACE SLIDING ROOF ECU 
    1. Temporarily replace the sliding roof ECU with a new or normally functioning one (See REMOVAL ).
    2. Clear the DTC (See DTC CHECK / CLEAR ).
  6. CHECK FOR DTC 
    1. Recheck for DTCs (See DTC CHECK / CLEAR ).

    Result 

    RESULT CHART

    Result Proceed to
    DTC B1273 is not output A
    DTC B1273 is output B

    B: REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH) 

    A: END (SLIDING ROOF ECU IS DEFECTIVE) 

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