2004 Lexus ES 330FACTORY OEM SERVICE PROCEDURE

Inspection Procedure

  1. CHECK POWER DOOR LOCK OPERATION 

    NG: GO TO POWER DOOR LOCK CONTROL SYSTEM (See  INSPECTION  ) 

    OK: Go to next step. 

  2. CHECK DTC 

    Data list (for MANUAL UP/DOWN switch)

    1. Using the hand-held tester, check that DTC B1221 is output when the switch is operated.

    HINT: Using DTC "B1221" which is a code when any of the master switch is constantly turned on, the MANUAL UP/DOWN switch operation can be monitored. If there is an output of DTC "B1221" when the switch is operated, the switch circuit can be considered normal.

    Standard [Driver side J/B (body ECU) (Switch condition)]: 

    Fig 1: Driver Side J/B (Body ECU) Switch Condition Chart
    G01437100Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE POWER WINDOW REGULATOR MASTER SWITCH ASSY 

    OK: Go to next step. 

  3. CONFIRM REMOTE CONTROL POWER WINDOW BY MASTER SWITCH OPERATION 

    HINT:

    • When the rear door does not operate by master switch, proceed to "A".
    • When the passenger's door does not operate by master switch, proceed to "B".

    B: REPAIR OR REPLACE WIRE HARNESS AND CONNECTOR MPX2 (D17-8) <=> MPX2 (F13-8) WIRE HARNESS 

    A: Go to next step. 

  4. CHECK CONTINUITY OF COMMUNICATION LINE 
    1. Disconnect the B5 and B6 connectors of the driver side J/B.
    2. Disconnect the R15 power window regulator switch assy rear (LH side) connector.
    3. Disconnect the R16 power window regulator switch assy rear (RH side) connector.
      Fig 2: Identifying Power Window Regulator Switch Assy Rear Terminals
      G01437101Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Check the continuity of each terminal of the disconnected connectors.

    Standard (Rear door LH): 

    Fig 3: Checking Continuity Between Communication Line Specifications Chart
    G01437102Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard (Rear door RH): 

    Fig 4: Checking Continuity Of Each Terminal Chart (Rear Door RH)
    G01437103Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    • When the rear door LH does not inspect the continuity, proceed to "NG-A".
    • When the rear door RH does not inspect the continuity, proceed to "NG-B".

    NG-A: REPAIR OR REPLACE WIRE HARNESS AND CONNECTOR MPX4 (B6-5) <=> MPX1 (R15-8) WIRE HARNESS 

    NG-B: REPAIR OR REPLACE WIRE HARNESS AND CONNECTOR MPX5 (B5-1) <=> MPX1 (R16-8) WIRE HARNESS 

    OK: REPLACE DRIVER SIDE JUNCTION BLOCK ASSY 

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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