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Home >> Lexus >> 2009 >> LS 600hL >> Repair and Diagnosis >> External Pages >> Different car >> Section 41 (Multiplex Communication) >> Lin Communication System >> DTC B1273 Sliding Roof ECU Communication Stop >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: When using the Intelligent tester or Techstream with the power switch OFF to troubleshoot:
Connect the Intelligent tester 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 (driver side junction block) stops

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

    Result: 

    RESULT REFERENCE

    Result Proceed to
    DTC B1273 output reoccurs A
    DTC B1273 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 - SLIDING ROOF DRIVE GEAR) 
    Fig 1: Identifying Main Body ECU Connector L11 And Sliding Roof Drive Gear Connector X5
    G04946967Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the L11 ECU connector.
    2. Disconnect the X5 gear connector.
    3. Measure the resistance according to the value(s) in the table below.

    Standard resistance 

    RESISTANCE REFERENCE

    Tester Connection Condition Specified Condition
    L11-10 (LIN2) - X5-4 (MPX1) Always Below 1 Ω
    L11-10 (LIN2) or X5-4 (MPX1) - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (SLIDING ROOF DRIVE GEAR - BATTERY AND BODY GROUND) 
    1. Disconnect the X5 gear connector
    2. Measure the resistance and voltage according to the value(s) in the table below

    Standard resistance 

    RESISTANCE REFERENCE

    Tester Connection Condition Specified Condition
    X5-2 (E) - Body ground Always Below 1 Ω

    Standard voltage 

    VOLTAGE SPECIFICATION

    Tester Connection Condition Specified Condition
    X5-1 (B) - Body ground Always 11 to 14 V
    Fig 2: Identifying Sliding Roof Drive Gear Connector X5
    G04946968Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  5. CHECK SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY (OPERATION) 
    1. Temporarily replace the sliding roof gear with a new or normally functioning one (see REMOVAL ).
    2. Clear the DTC (see DTC CHECK / CLEAR )
  6. CHECK FOR DTC 
    1. Recheck for DTC (see DTC CHECK / CLEAR )

    Result: 

    RESULT REFERENCE

    Result Proceed to
    DTC B1273 output does not reoccur A
    DTC B1273 output reoccurs B

    B: REPLACE MAIN BODY ECU 

    A: END (SLIDING ROOF DRIVE GEAR IS DEFECTIVE) 

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