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Home >> Lexus >> 2005 >> LS 430 >> Repair and Diagnosis >> Body & Frame >> Windows >> Power Window Control System - Diagnostics >> DTC B1237, B1238: Jam Protection Limit Switch Circuit On Rear Left Door, Jam Protection Pulse Switch Circuit On Rear Left Door >> 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: 

    DTC RESULT

    Result Proceed to
    DTC is erased A
    DTC is not erased B

    HINT:

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

    B: Go to step 2 

    A 

    END 

  2. READ DATA LIST USING 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: 

    DATA LIST REFERENCE

    Item Measurement Item / Display (Range) Normal Condition Diagnostic Note
    LIMIT SW Jam protection limit switch / ON or OFF ON: Jam protection limit switch operates OFF: Jam protection limit switch do not operate -

    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 to the table below.
      NOTE: Do not apply battery voltage to any terminals except terminals 1 and 2.
    3. Check that the motor rotates smoothly.

    OK: 

    MOTOR ROTATES CONDITIONS

    Measurement Condition Specified Condition
    Battery positive (+) --> Terminal 1 (D) Battery negative (-) --> Terminal 2 (U) Motor gear rotates clockwise
    Battery positive (+) --> Terminal 2 (U) Battery negative (-) --> Terminal 1 (D) Motor gear rotates counterclockwise

    NG: REPLACE POWER WINDOW REGULATOR MOTOR ASSY (REAR LH) 

    Fig 1: Inspecting Power Window Regulator Motor Assy (Rear LH)
    G03000768Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    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 connectors.

    Standard 

    RESISTANCE SPECIFICATIONS

    Tester Connection Specified Condition
    R13-16 (LMT) - P16-4 (LMT) Below 1 Ω
    R13-17 (PLS) - P16-3 (PLS) Below 1 Ω
    R13-14 (SGND) - P16-5 (E) Below 1 Ω
    R13-16 (LMT) or P16-4 (LMT) - Body ground 10 kΩ or higher
    R13-17 (PLS) or P16-3 (PLS) - Body ground 10 kΩ or higher
    R13-14 (SGND) or P16-5 (E) - Body ground 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    Fig 2: Identifying R13 ECU And P16 Motor Connector Terminals
    G03000769Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

    REPLACE REAR DOOR LH ECU 

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