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Home >> Lexus >> 2005 >> SC 430 >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Theft Deterrent System - Diagnostics >> Ignition Switch Circuit >> Inspection Procedure

Inspection Procedure

  1. INSPECT FUSE (AM1, MPX-IG) 
    1. Remove the AM1 and MPX-IG fuses from the driver side J/B.
    2. Measure the resistance of the fuses.

      Standard: Below 1 Ω 

    1. NG: REPLACE FUSE 
    2. OK: Go to next step. 
  2. INSPECT RELAY (Marking: IG1) 
    1. Remove the IG1 relay from the driver side J/B.
    2. Measure the resistance of the relay.

      Standard: 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition
      3 - 5 10 k ohms or higher
      3 - 5 Below 1 ohms (when battery voltage is applied to terminals 1 and 2)
      Fig 1: Identifying IG1 Relay
      G02957085Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPLACE RELAY 
    2. OK: Go to next step. 
  3. INSPECT IGNITION SWITCH ASSY 
    1. Measure the resistance of the switch.

      Standard: 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Switch Position Specified Condition
      2 (AM1) - 4 (IG1) LOCK 10 k ohms or higher
      2 (AM1) - 4 (IG1) ON Below 1 ohms
      Fig 2: Identifying Ignition Switch Assy
      G02957086Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPLACE IGNITION SWITCH ASSY 
    2. OK: Go to next step. 
  4. CHECK WIRE HARNESS (IGNITION SWITCH ASSY - BATTERY AND BODY GROUND) 
    1. Disconnect the 118 switch connector.
    2. Measure the resistance and voltage of the wire harness side connector.

      Standard: 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition
      118-2 (AM1) - Body ground 10 to 14 V
      118-4 (IG1) - Body ground Below 1 ohms
      Fig 3: Identifying Wire Harness (Ignition Switch Assy - Battery & Body Ground)
      G02957087Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. OK: Go to next step. 
  5. CHECK WIRE HARNESS (THEFT WARNING ECU ASSY - BATTERY) 
    1. Disconnect the T7 ECU connector.
    2. Measure the resistance and voltage of the wire harness side connector.

      Standard: 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      17-24 (IG) - Body ground Ignition switch ON 10 to 14 V
      Fig 4: Identifying Wire Harness (Theft Warning ECU Assy - Battery)
      G02957088Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE  
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