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HOMESERVICE MANUALSTOYOTA2004SIENNA XLE LIMITED, AWDREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTANTI-THEFT SYSTEMSTHEFT DETERRENT SYSTEM - DIAGNOSISIGNITION SWITCH CIRCUITINSPECTION PROCEDURE
2004 Toyota Sienna XLE Limited, AWD

Inspection Procedure

2004 Toyota Sienna XLE Limited, AWDSECTION Inspection Procedure
  1. INSPECT FUSE (ECU-IG, AM1) 
    1. Remove the ECU-IG and AM1 fuses from the instrument panel J/B.
    2. Check the resistance.

      Standard: Below 1 Ω 

    1. NG: REPLACE FUSE 
    2. OK: Go to next step. 
  2. INSPECT RELAY (IG1) 
    Fig 1: Inspecting IG1 Relay
    G02934680Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the IG1 relay from the instrument panel J/B.
    2. Check the operation of the IG1 relay.

      Standard: 

      TERMINAL SPECIFIED CONDITION

      Terminal No. Specified Condition
      3 - 5 10 kΩ or higher
      3 - 5 Below 1 Ω (When battery voltage is applied to terminals 1 and 2)
    1. NG: REPLACE RELAY 
    2. OK: Go to next step. 
  3. INSPECT IGNITION OR STARTER SWITCH ASSY 
    Fig 2: Inspecting Ignition Or Starter Switch Assy
    G02934682Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Check the switch resistance.

      Standard: 

      TERMINAL SPECIFIED CONDITION

      Terminal No. Switch Position Specified Condition
      1 - 3 ACC Below 1 Ω
      1 - 2 ON Below 1 Ω
      1 - 3 ON Below 1 Ω
      5 - 6 ON Below 1 Ω
      1 - 2 START Below 1 Ω
      5 - 4 START Below 1 Ω
      5 - 6 START Below 1 Ω
    1. NG: REPLACE IGNITION OR STARTER SWITCH ASSY 
    2. OK: Go to next step. 
  4. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSY (MULTIPLEX NETWORK BODY ECU) (POWER SOURCE) 
    Fig 3: Identifying 1A Instrument Panel J/B Assy Connector Terminal (Wire Harness Side)
    G02934683Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the 1A J/B connector.
    2. Check the voltage between the wire harness side connector and the body ground.

      Standard: 

      TERMINAL SPECIFIED CONDITION

      Terminal No. Condition Specified Condition
      1A-1 (IG) - Body ground Ignition switch ON 10 to 14 V
    1. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. OK: REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSY 
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.