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Home >> Lexus >> 2004 >> LS 430 >> Repair and Diagnosis >> Body & Frame >> Windows >> Power Window Control System - Diagnosis >> DTC B1237, B1238: Jam Protection Limit Switch Circuit On Rear Door LH, Jam Protection Pulse Sensor Circuit On Rear Door LH >> Inspection Procedure

Inspection Procedure

  1. CHECK POWER WINDOW OPERATION 
    1. Lower the rear LH power window from the fully closed position to the fully open position. Check if the DTC is erased.

    Result: 

    Fig 1: Power Window Operation Result Chart
    G01442940Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    If the DTC is erased, it is possible the driver door ECU incorrectly detected this DTC previously.

    B: Go to step 2 

    A: Go to next step. 

    END 

  2. READ VALUE OF HAND-HELD TESTER 
    1. Connect the hand-held tester (with CAN VIM) to the DLC3.
    2. Turn the ignition switch ON and press the hand-held tester main switch ON.
    3. Select the items below in the DATA LIST, and read the displays on the hand-held tester.

    Rear door LH ECU: 

    Fig 2: Rear Door LH ECU - Data List
    G01442941Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: "ON" (jam protection limit switch operates) appears on the screen. 

    NG: Go to step 3 

    OK: REPLACE REAR DOOR LH ECU 

  3. INSPECT POWER WINDOW REGULATOR MOTOR ASSY REAR LH 
    1. Remove the motor (see OVERHAUL ).
    2. Apply battery voltage to the motor connector according the figure Fig 3 below.
    3. Check that the motor rotates smoothly.
    NOTE: Do not apply battery voltage to any terminals except terminals 1 and 2.

    OK: Go to next step. 

    Fig 3: Measurement Condition Chart
    G01442942Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 4: Inspecting Power Window Regulator Motor Assy Rear LH
    G01442943Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR POWER WINDOW REGULATOR MOTOR ASSY 

    OK: Go to next step. 

  4. CHECK WIRE HARNESS (REAR DOOR LH ECU - POWER WINDOW REGULATOR MOTOR ASSY REAR LH) 
    1. Disconnect the R13 ECU connector.
    2. Disconnect the P16 motor connector.
    3. Measure the resistance of the wire harness side connector.

    Standard: 

    Fig 5: Terminals Resistance Reference Chart
    G01442944Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 6: Checking Wire Harness (Rear Door LH ECU - Power Window Regulator Motor Assy Rear LH)
    G01442945Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: REPLACE REAR DOOR LH ECU