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Home >> Lexus >> 2004 >> ES 330 >> Repair and Diagnosis >> External Pages >> Different car >> Section 311 (Navigation System - Diagnostics) >> Navigation System >> Steering Pad Switch Circuit >> Inspection Procedure
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Inspection Procedure

WARNING: This page is about a different car, the 2005 Toyota Sienna. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: The vehicle is equipped with SRS (Supplemental Restraint System) such as airbags. Before servicing (including removal or installation of parts), be sure to read the precautionary notice for the SUPPLEMENTAL RESTRAINT SYSTEM .
  1. INSPECT RADIO AND NAVIGATION ASSY 
    1. Disconnect the radio and navigation assy connector R13.
    2. Measure the resistance according to the value(s) in RADIO AND NAVIGATION ASSY RESISTANCE .

      Standard: 

    RADIO AND NAVIGATION ASSY RESISTANCE

    Tester connection Condition Specified condition
    SW1 - SWG No switch is pushed Approx. 100 kΩ
    SW1 - SWG SEEK+ switch: push Approx. 0 Ω
    SW1 - SWG SEEK- switch: push Approx. 0.3 kΩ
    SW1 - SWG VOL+ switch: push Approx. 1 kΩ
    SW1 - SWG VOL- switch: push Approx. 3.2 kΩ
    SW2 - SWG No switch is pushed Approx. 100 kΩ
    SW2 - SWG MODE switch: push Approx. 0 Ω
    Fig 1: Disconnecting Radio & Navigation Assy Connector R13
    G02630314Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: GO TO STEP   2 
    2. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  
  2. INSPECT STEERING PAD SWITCH ASSY 
    Fig 2: Inspecting Steering Pad Switch Assy
    G02630315Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the steering pad switch assy connector C13.
    2. Measure the resistance according to the value(s) in STEERING PAD SWITCH ASSY RESISTANCE .

      Standard: 

    STEERING PAD SWITCH ASSY RESISTANCE

    Tester connection Condition Specified condition
    AU1 - EAU No switch is pushed Approx. 100 kΩ
    AU1 - EAU SEEK+ switch: push Approx. 0 Ω
    AU1 - EAU SEEK- switch: push Approx. 0.3 kΩ
    AU1 - EAU VOL+ switch: push Approx. 1 kΩ
    AU1 - EAU VOL- switch: push Approx. 3.2 kΩ
    AU2 - EAU No switch is pushed Approx. 100 kΩ
    AU2 - EAU MODE switch: push Approx. 0 Ω
    1. NG: REPLACE STEERING PAD SWITCH LH (SEE  STEERING PAD SWITCH LH  ) 
    2. OK: GO TO NEXT STEP 
  3. INSPECT SPIRAL CABLE SUB-ASSY 
    1. Disconnect the steering pad switch assy and spiral cable sub-assy connectors.
    2. Measure the resistance according to the value(s) in SPIRAL CABLE SUB-ASSY RESISTANCE .

      Standard: 

    SPIRAL CABLE SUB-ASSY RESISTANCE

    Tester connection Specified condition
    EAU - EAU Below 1 Ω
    AU1 - AU1 Below 1 Ω
    AU2 - AU2 Below 1 Ω
    Fig 3: Inspecting Spiral Cable Sub-Assy
    G02630316Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPLACE  SPIRAL CABLE SUB-ASSY 
    2. OK: GO TO NEXT STEP 
  4. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSY - RADIO AND NAVIGATION ASSY) 
    1. Disconnect the connectors from the spiral cable sub-assy and radio and navigation assy.
    2. Measure the resistance according to the value(s) in SPIRAL CABLE SUB-ASSY - RADIO AND NAVIGATION ASSY RESISTANCE .

      Standard: 

    SPIRAL CABLE SUB-ASSY - RADIO AND NAVIGATION ASSY RESISTANCE

    Tester connection Specified condition
    SW1 - AU1 Below 1 Ω
    SW2 - AU2 Below 1 Ω
    SWG - EAU Below 1 Ω
    SW1-Body ground 10 kΩ or higher
    SW2-Body ground 10 kΩ or higher
    SWG-Body ground 10 kΩ or higher
    Fig 4: Disconnecting Radio & Navigation Assy Connector R13
    G02630317Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 5: Spiral Cable Sub Assy Connector Front View
    G02630318Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  
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