2008 Toyota Sequoia SR5, 5.7 Y, RWDFACTORY OEM SERVICE PROCEDURE

Inspection Procedure

  1. INSPECT FUSES (RAD NO. 1, ACC) 
    1. Remove the ACC fuse from the main body ECU.
    2. Remove the RAD NO. 1 fuse from the engine room junction block.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      STANDARD RESISTANCE

      Tester Connection Condition Specified Condition
      RAD NO. 1 fuse Always Below 1 Ω
      ACC fuse
    4. Install the fuses.

    NG: REPLACE FUSES 

    Fig 1: Identifying ACC Fuse And RAD NO. 1 Fuse Location
    G05652699Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to Next Step 

  2. CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER - BATTERY AND BODY GROUND) 
    1. Disconnect the I20 navigation receiver assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      STANDARD RESISTANCE

      Tester Connection Condition Specified Condition
      I20-20 (GND) - Body ground Always Below 1 Ω
    3. Measure the voltage according to the value(s) in the table below.
      Fig 2: Identifying I20 Navigation Receiver Assembly Connector Terminals
      G05652700Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Voltage 

      STANDARD VOLTAGE

      Tester Connection Switch Condition Specified Condition
      I20-1 (B) - Body ground Always 11 to 14 V
      I20-11 (ACC) - Body ground Ignition switch ACC
    4. Reconnect the navigation receiver assembly connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

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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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