NAVIGATION SYSTEM (for HDD) Steering Pad Switch Circuit

DESCRIPTION

This circuit sends an operation signal from the steering pad switch assembly to the navigation computer sub-assembly.

If there is an open in the circuit, the navigation system cannot be operated using the steering pad switch assembly.

If there is a short in the circuit, the resulting condition is the same as if the switch were continuously pressed. Therefore, the navigation computer sub-assembly cannot be operated using the steering pad switch assembly, and the navigation computer sub-assembly itself cannot function.

WIRING DIAGRAM

A003ZWBE07

INSPECTION PROCEDURE

Note

The vehicle is equipped with a Supplemental Restraint System (SRS). Before servicing (including removal or installation of parts), be sure to read Precaution for Supplemental Restraint System Click here.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (STEERING PAD SWITCH SIGNAL)


    1. Disconnect the H60 navigation computer sub-assembly connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H60-25 (SW1) - H60-23 (SWG) No switch pushed 95 to 105 kΩ
      H60-25 (SW1) - H60-23 (SWG) Seek+ switch pushed Below 2.5 Ω
      H60-25 (SW1) - H60-23 (SWG) Seek- switch pushed 313 to 345 Ω
      H60-25 (SW1) - H60-23 (SWG) Volume+ switch pushed 950 to 1050 Ω
      H60-25 (SW1) - H60-23 (SWG) Volume- switch pushed 2955 to 3265 Ω
      H60-24 (SW2) - H60-23 (SWG) No switch pushed 95 to 105 kΩ
      H60-24 (SW2) - H60-23 (SWG) MODE switch pushed Below 2.5 Ω
      H60-24 (SW2) - H60-23 (SWG) Voice switch pushed 2955 to 3265 Ω
      H60-24 (SW2) - H60-23 (SWG) On Hook switch pushed 323 to 335 Ω
      H60-24 (SW2) - H60-23 (SWG) Off Hook switch pushed 950 to 1050 Ω

    NG

    CHECK HARNESS AND CONNECTOR Click here

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

  2. CHECK HARNESS AND CONNECTOR


    1. Disconnect the H60 navigation computer sub-assembly connector.

    2. Disconnect the H30 spiral with sensor cable sub-assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H60-25 (SW1) - H30-6 (AU1) Always Below 1 Ω
      H60-24 (SW2) - H30-5 (AU2) Always Below 1 Ω
      H60-23 (SWG) - H30-3 (EAU) Always Below 1 Ω
      H60-25 (SW1) - Body ground Always 10 kΩ or higher
      H60-24 (SW2) - Body ground Always 10 kΩ or higher
      H60-23 (SWG) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY


    1. A003XSFE01
      Text in Illustration
      *a

      Component without harness connected

      (Spiral with Sensor Cable Sub-assembly)
      *b Steering Pad Switch Assembly Side
      *c Vehicle Side

      Disconnect the z4 steering pad switch assembly and H30 spiral with sensor cable sub-assembly connectors.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      z4-8 (EAU) - H30-3 (EAU) Center Below 1 Ω
      2.5 rotations to the left
      2.5 rotations to the right
      z4-11 (AU1) - H30-6 (AU1) Center Below 1 Ω
      2.5 rotations to the left
      2.5 rotations to the right
      z4-10 (AU2) - H30-5 (AU2) Center Below 1 Ω
      2.5 rotations to the left
      2.5 rotations to the right

    3. After setting the spiral with sensor cable sub-assembly to the center position, rotate the spiral with sensor cable sub-assembly 2.5 times clockwise. Then while rotating the spiral with sensor cable sub-assembly 5 times counterclockwise, measure the resistance as shown in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      z4-8 (EAU) - H30-3 (EAU) Always Below 1 Ω
      z4-11 (AU1) - H30-6 (AU1) Always Below 1 Ω
      z4-10 (AU2) - H30-5 (AU2) Always Below 1 Ω

      Note


      • The spiral with sensor cable sub-assembly is an important part of the SRS airbag system. Incorrect removal or installation of the spiral with sensor cable sub-assembly may prevent the airbag from deploying. Refer to the pages shown in the brackets.

      • As the spiral with sensor cable sub-assembly may break, do not rotate the spiral with sensor cable with sensor sub-assembly more than the specified amount.

      Tech Tips



    NG

    REPLACE SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY Click here

    OK

  4. INSPECT STEERING PAD SWITCH ASSEMBLY


    1. Disconnect the z4 steering pad switch assembly connector.

      A003VPTE01

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      z4-11 (AU1) - z4-8 (EAU) No switch pushed 95 to 105 kΩ
      z4-11 (AU1) - z4-8 (EAU) Seek+ switch pushed Below 2.5 Ω
      z4-11 (AU1) - z4-8 (EAU) Seek- switch pushed 313 to 345 Ω
      z4-11 (AU1) - z4-8 (EAU) Volume+ switch pushed 950 to 1050 Ω
      z4-11 (AU1) - z4-8 (EAU) Volume- switch pushed 2955 to 3265 Ω
      z4-10 (AU2) - z4-8 (EAU) No switch pushed 95 to 105 kΩ
      z4-10 (AU2) - z4-8 (EAU) MODE switch pushed Below 2.5 Ω
      z4-10 (AU2) - z4-8 (EAU) Voice switch pushed 2955 to 3265 Ω
      z4-10 (AU2) - z4-8 (EAU) On Hook switch pushed 323 to 335 Ω
      z4-10 (AU2) - z4-8 (EAU) Off Hook switch pushed 950 to 1050 Ω
      Text in Illustration
      *1 MODE *2 Volume+
      *3 Volume- *4 Seek+
      *5 Seek- *6 Voice
      *7 Off Hook *8 On Hook
      *a

      Component without harness connected

      (Steering Pad Switch Assembly)

      		 - -

    NG

    REPLACE STEERING PAD SWITCH ASSEMBLY Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here