Inspection Procedure

2009 Toyota Sienna XLE, FWDSECTION Inspection Procedure
  1. INSPECT FOLD SEAT CONTROL ECU 
    1. Remove the fold seat control ECU with connectors still connected.
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      LH side 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection (Symbols) Condition Specified Condition
      P62-37 (LCKR) - Body ground Fold lock switch: UNLOCK Below 1 V
      P62-37 (LCKR) - Body ground Fold lock switch: LOCK 10 to 14 V

      RH side 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection (Symbols) Condition Specified Condition
      P64-37 (LCKR) - Body ground Fold lock switch: UNLOCK Below 1 V
      P64-37 (LCKR) - Body ground Fold lock switch: LOCK 10 to 14 V
      Fig 1: Inspecting Fold Seat Control ECU
      G05142101Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

    NG: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (FOLD SEAT CONTROL ECU - FOLD LOCK SWITCH) 
    1. Disconnect the connectors from the fold seat control ECU.
    2. Disconnect the connector from the fold lock switch.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      LH side 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection (Symbols) Condition Condition
      P62-37 (LCKR) - F22-15 (LCKR) Always Below 1 Ω
      P62-37 (LCKR) - Body ground Always 10 kΩ or higher

      RH side 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection (Symbols) Condition Condition
      P64-37 (LCKR) - F23-15 (LCKR) Always Below 1 Ω
      P64-37 (LCKR) - Body ground Always 10 kΩ or higher
    4. Fig 2: Checking Harness And Connector (Fold Seat Control ECU - Fold Lock Switch)
      G05142102Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (FOLD LOCK SWITCH - BODY GROUND) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      LH side 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection (Symbols) Condition Specified Condition
      F22-1 (E) - Body ground Always Below 1 Ω

      RH side 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection (Symbols) Condition Specified Condition
      F23-1 (E) - Body ground Always Below 1 Ω
    2. Fig 3: Checking Harness And Connector (Fold Lock Switch - Body Ground)
      G05142094Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  4. INSPECT FOLD LOCK SWITCH 
    1. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      LH side 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection (Symbols) Condition Specified Condition
      F22-15 (LCKR) - F22-1 (E) Fold lock switch: UNLOCK Below 1 Ω
      F22-15 (LCKR) - F22-1 (E) Fold lock switch: LOCK 10 kΩ or higher

      RH side 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection (Symbols) Condition Specified Condition
      F23-15(LCKR) - F23-1 (E) Fold lock switch: UNLOCK Below 1 Ω
      F23-15 (LCKR) - F23-1 (E) Fold lock switch: LOCK 10 kΩ or higher
      Fig 4: Inspecting Fold Lock Switch
      G05142104Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE FOLD LOCK SWITCH 

    OK: REPLACE FOLD SEAT CONTROL ECU 

RENDER: 1.0x

NO RELATED

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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.