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HOMESERVICE MANUALSTOYOTA2009SEQUOIA LIMITED, 5.7 Y, RWDREPAIR AND DIAGNOSISBODY & FRAMEDOOR LOCKSTHEFT DETERRENT & KEYLESS ENTRYTHEFT DETERRENT SYSTEMIGNITION SWITCH CIRCUITINSPECTION PROCEDURE
2009 Toyota Sequoia Limited, 5.7 Y, RWD

Inspection Procedure

2009 Toyota Sequoia Limited, 5.7 Y, RWDSECTION Inspection Procedure
  1. READ VALUE USING TECHSTREAM 
    1. Connect a Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream main switch on.
    4. Select the items below in the Data List and read the display on the Techstream.

      Main Body 

      DATA LIST

      Item Measurement Item/Range Normal Condition Diagnostic Note
      IGSW Ignition switch ON signal ON/OFF ON: Ignition switch is ON
      OFF: Ignition switch is off      		 -
      ACC SW Ignition switch ACC signal ON/ OFF ON: Ignition switch is ACC
      OFF: Ignition switch is off      		 -

      OK: When the ignition switch is operated, the display changes as shown in the table. 

    NG: Go to step 2 

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

  2. INSPECT FUSES (AM1, ECU-IG No. 2) 
    1. Remove the AM1 and ECU-IG No. 2 fuses from the main body ECU.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      AM1 fuse Always Below 1 Ω
      ECU-IG No. 2 fuse Always Below 1 Ω

    NG: REPLACE FUSE 

    Fig 1: Identifying AM1 And ECU-IG No 2 Fuse
    G05653330Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to Next Step 

  3. CHECK HARNESS AND CONNECTOR (BATTERY - MAIN BODY ECU) 
    1. Disconnect the DA main body ECU connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

      VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      DA-1 - Body ground Always 11 to 14 V

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 2: Identifying Main Body ECU Connector Terminals
    G05653331Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to Next Step 

  4. INSPECT IGNITION SWITCH ASSEMBLY 
    1. Disconnect the H10 ignition switch connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Switch Condition Specified Condition
      1 - 4 Ignition switch ON Below 1 Ω
      2 - 4 Ignition switch ACC Below 1 Ω

    NG: REPLACE IGNITION SWITCH ASSEMBLY  (See REMOVAL )

    Fig 3: Inspecting Ignition Switch Assembly
    G05653332Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to Next Step 

  5. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - IGNITION SWITCH AND BODY GROUND) 
    1. Disconnect the DD main body ECU connector.
    2. Disconnect the H10 ignition switch connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      DD-47 - H10-4 (AM1) Always Below 1 Ω
      DD-43 - H10-1 (IG1) Always Below 1 Ω
      DD-45 - H10-2 (ACC) Always Below 1 Ω
      DD-62 - Body ground Always Below 1 Ω
      DD-47 - Body ground Always 10 kΩ or higher
      DD-43 - Body ground Always 10 kΩ or higher
      DD-45 - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 4: Identifying Main Body ECU And Ignition Switch Connector Terminals
    G05653333Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE MAIN BODY 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.