AUDIO AND VISUAL SYSTEM(w/o Multi-display) Steering Pad Switch Circuit

DTC Code DTC Name
Steering Pad Switch Circuit

DESCRIPTION

This circuit sends an operation signal from the steering pad switch to the radio receiver assembly.

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

If there is a short in the circuit, the same condition as when the switch is continuously depressed occurs.

Therefore, the radio receiver assembly cannot be operated using the steering pad switch, and the radio receiver assembly itself cannot function.

WIRING DIAGRAM

E195971E20

CAUTION / NOTICE / HINT

CAUTION:

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 Precaution in the SRS (Click here).

PROCEDURE

  1. INSPECT STEERING PAD SWITCH ASSEMBLY

    1. Remove the steering pad switch assembly.

      Click here

      E204999C06

      *1

      Volume+ Switch

      *2

      Volume- Switch

      *3

      Seek- Switch

      *4

      Seek+ Switch

      *5

      Mode Switch

      *6

      Off Hook Switch

      *7

      On Hook Switch

      *8

      Voice Switch

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

      Standard Resistance

      Tester Connection

      Switch Condition

      Specified Condition

      10 (AU1) - 8 (EAU)

      No switch is pushed

      95 to 105 kΩ

      Seek+ switch is pushed

      Below 2.5 Ω

      Seek- switch is pushed

      313 to 345 Ω

      Volume+ switch is pushed

      950 to 1050 Ω

      Volume- switch is pushed

      2955 to 3265 Ω

      9 (AU2) - 8 (EAU)

      No switch is pushed

      95 to 105 kΩ

      MODE switch is pushed

      Below 2.5 Ω

      On hook switch is pushed

      313 to 345 Ω

      Off hook switch is pushed

      950 to 1050 Ω

      Voice switch is pushed

      2955 to 3265 Ω

      Result

      Result

      OK

      NG
    NG

    REPLACE STEERING PAD SWITCH ASSEMBLY

    Click here

    OK

  2. INSPECT SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY

    1. Remove the spiral with sensor cable sub-assembly.

      Click here

      B312289C02

      *a

      Steering Pad Switch Assembly Side

      *b

      Vehicle Side

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      8 (EAU) - 4 (EAU)

      Spiral with sensor cable is turned 2.5 rotations counterclockwise

      Below 1 Ω

      Spiral with sensor cable is centered

      Spiral with sensor cable is turned 2.5 rotations clockwise

      10 (AU1) - 6 (AU1)

      Spiral with sensor cable is turned 2.5 rotations counterclockwise

      Spiral with sensor cable is centered

      Spiral with sensor cable is turned 2.5 rotations clockwise

      9 (AU2) - 5 (AU2)

      Spiral with sensor cable is turned 2.5 rotations counterclockwise

      Spiral with sensor cable is centered

      Spiral with sensor cable is turned 2.5 rotations clockwise
      CAUTION:

      The spiral with sensor cable is an important part of the SRS airbag system. Incorrect removal or installation of the spiral with sensor cable may prevent the airbag from deploying. Be sure to read the Precaution in the SRS section.

      Click here

      Result

      Result

      OK

      NG
    NG

    REPLACE SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY

    Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - SPIRAL WITH SENSOR CABLE)

    1. Disconnect the H30 radio receiver assembly connector.

    2. Disconnect the G28 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

      H30-7 (SW1) - G28-6 (AU1)

      Always

      Below 1 Ω

      H30-8 (SW2) - G28-5 (AU2)

      Always

      Below 1 Ω

      H30-6 (SWG) - G28-4 (EAU)

      Always

      Below 1 Ω

      H30-7 (SW1) - Body ground

      Always

      10 kΩ or higher

      H30-8 (SW2) - Body ground

      Always

      10 kΩ or higher

      H30-6 (SWG) - Body ground

      Always

      10 kΩ or higher

      Result

      Result

      OK

      NG
    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR