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Home >> Toyota >> 2008 >> Highlander Base, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 42 (Audio System & Visual System (Hybrid)) >> Audio And Visual System >> Steering Pad Switch Circuit >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different variant/trim than selected.
NOTE: The vehicle is equipped with an SRS (Supplemental Restraint System) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the precautionary notice for the Supplemental Restraint System (See PRECAUTION ).
  1. INSPECT RADIO RECEIVER 
    1. Disconnect the radio receiver connector.
      Fig 1: Identifying E3Radio Receiver Connector Terminals
      G05420482Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

    Standard resistance 

    RESISTANCE SPECIFICATION

    Tester Connection Condition Specified Condition
    E3-7 (SW1) - E3-6 (SWG) No switch is pushed Approx. 100 kΩ
    E3-7 (SW1) - E3-6 (SWG) SEEK+ switch: push 0 to 2.5 Ω
    E3-7 (SW1) - E3-6 (SWG) SEEK- switch: push Approx. 0.3 kΩ
    E3-7 (SW1) - E3-6 (SWG) VOL+ switch: push Approx. 1 kΩ
    E3-7 (SW1) - E3-6 (SWG) VOL- switch: push Approx. 3.1 kΩ
    E3-8 (SW2) - E3-6 (SWG) No switch is pushed Approx. 100 kΩ
    E3-8 (SW2) - E3-6 (SWG) MODE switch: push 0 to 2.5 Ω
    E3-8 (SW2) - E3-6 (SWG) ON HOOK switch: push ((1)) Approx. 0.3 kΩ
    E3-8 (SW2) - E3-6 (SWG) OFF HOOK switch: push((1)) Approx. 1 kΩ
    (1) for Premium models

    NG: Go to step 2 

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

  2. INSPECT STEERING PAD SWITCH ASSEMBLY 
    1. Disconnect the steering pad switch assembly connector.
      2. Fig 2: Identifying Steering Pad Switch Assembly
      G05420483Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the values in the table below.

    Standard resistance 

    RESISTANCE SPECIFICATION

    Tester Connection Condition Specified Condition
    z2-10 (AU1) - z2-8 (EAU) No switch is pushed Approx. 100 kΩ
    z2-10 (AU1) - z2-8 (EAU) SEEK+ switch: push 0 to 2.5 Ω
    z2-10 (AU1) - z2-8 (EAU) SEEK- switch: push Approx. 0.3 kΩ
    z2-10 (AU1) - z2-8 (EAU) VOL+ switch: push Approx. 1 kΩ
    z2-10 (AU1) - z2-8 (EAU) VOL- switch: push Approx. 3.1 kΩ
    z2-9 (AU2) - z2-8 (EAU) No switch is pushed Approx. 100 kΩ
    Z2-9 (AU2) - Z2-8 (EAU) MODE switch: push 0 to 2.5 Ω
    z2-9 (AU2) - z2-8 (EAU) ON HOOK switch: push ((1)) Approx. 0.3 kΩ
    Z2-9 (AU2) - Z2-8 (EAU) OFF HOOK switch: push ((1)) Approx. 1 kΩ
    (1) for Premium models

    NG: REPLACE STEERING PAD SWITCH ASSEMBLY  (See STEERING PAD SWITCH )

    OK: Go to next step 

  3. INSPECT SPIRAL CABLE 
    1. Disconnect the steering pad switch and spiral cable connectors.
      Fig 3: Identifying Steering Pad Switch & Spiral Cable Connector Terminals
      G05420484Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

    RESISTANCE SPECIFICATION

    Tester Connection Spiral Cable Position Specified Condition
    z2-8 (EAU) - D16-4 (EAU) Center Below 1 Ω
    2.5 rotations to the left
    2.5 rotations to the right
    z2-10 (AU1) - D16-6 (AU1) Center Below 1 Ω
    2.5 rotations to the left
    2.5 rotations to the right
    z2-9 (AU2) - D16-5 (AU2) Center Below 1 Ω
    2.5 rotations to the left
    2.5 rotations to the right
    NOTE: The spiral cable is an important part of the SRS airbag system. Incorrect removal or installation of the spiral cable may prevent the airbag from deploying. Be sure to read the page shown in the brackets.

    HINT:

    NG: REPLACE SPIRAL CABLE  (See REMOVAL )

    OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (SPIRAL CABLE - RADIO RECEIVER) 

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