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HOMESERVICE MANUALSTOYOTA2009SEQUOIA LIMITED, 5.7 Y, RWDREPAIR AND DIAGNOSISBODY & FRAMEDOOR LOCKSTHEFT DETERRENT & KEYLESS ENTRYENGINE IMMOBILIZER SYSTEMECU POWER SOURCE CIRCUITINSPECTION PROCEDURE
2009 Toyota Sequoia Limited, 5.7 Y, RWD

Inspection Procedure

2009 Toyota Sequoia Limited, 5.7 Y, RWDSECTION Inspection Procedure
  1. INSPECT FUSES (IMB, IGN) 
    1. Remove the IMB fuse and IGN fuses from the engine room relay block.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      IMB fuse Always Below 1 Ω
      IGN fuse

    NG: CHECK FOR SHORTS IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSES 

    OK: Go to Next Step 

  2. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - BATTERY AND BODY GROUND) 
    1. Disconnect the H32 ECU connector.
    2. Measure the resistance and voltage according to the value(s) in the table below.

      Standard Resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      H32-16 (GND) - Body ground Always Below 1 Ω

      Standard Voltage 

      VOLTAGE SPECIFICATION

      Tester Connection Switch Condition Specified Condition
      H32-1 (+B) - Body ground Always 11 to 14 V
      H32-2 (IG) - Body ground Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
    3. Reconnect the ECU connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 1: Identifying Transponder Key ECU Connector Terminals
    G05653308Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE  (See TERMINALS OF 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.