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Home › Toyota › 2003 › Tundra Base, Automatic › Repair and Diagnosis › Body & Frame › Door Locks › Vehicle Intrusion Protection System - Diagnostics › Ignition Switch Circuit › Inspection Procedure

Inspection Procedure

  1. Inspect AM1 M-fuse and ECU-IG fuse. 

    PREPARATION: 

    1. Remove the M-fuse from the engine room relay block.
    2. Remove the fuse from the driver side J/B.

    CHECK: 

    Check the continuity.

    OK: 

    Continuity 

    1. NG : Replace M-fuse and/or fuse. 
    2. OK : Go to Next Step. 

  2. Inspect ignition switch. 

    CHECK: 

    Check the switch continuity.

    Fig 1: Inspecting Ignition Switch And Connector
    G02843935Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: 

    SPECIFIED CONDITION

    Switch position Tester connection Specified condition
    LOCK - No continuity
    ACC 2 - 3 Continuity
    ON 2 - 3 - 4 6 - 7 Continuity
    START 1 - 2 - 4 6 - 7 - 8 Continuity
    1. NG : Replace ignition switch. 
    2. OK : Go to Next Step. 
  3. Check voltage between terminal IG of TVIP ECU and body ground. 

    PREPARATION: 

    Disconnect the T12 TVIP ECU connector.

    CHECK: 

    Check the voltage between the T12 TVIP ECU wire harness side connector and body ground.

    Fig 2: Identifying T12 TVIP ECU Connector Terminal
    G02843936Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: 

    SPECIFIED CONDITION

    Symbols (Terminal No.) Specified condition
    IG (T12-13) <--> Body ground 10 - 14 V
    1. NG : Repair or replace harness and connector. 
    2. OK : Check and replace TVIP ECU. 
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