AUDIO AND VISUAL SYSTEM (w/o Navigation System) Steering Pad Switch Circuit

DESCRIPTION

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

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

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

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

WIRING DIAGRAM

A003WBUE02

INSPECTION PROCEDURE

Note

The vehicle is equipped with a Supplemental Restraint System (SRS) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the precaution for Supplemental Restraint System Click here.

PROCEDURE


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


    1. Disconnect the radio receiver assembly connector.

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

      Standard Resistance
      for 10 Speakers
      Tester Connection Condition Specified Condition
      H52-7 (SW1) - H52-6 (SWG) No switch pushed 95 to 105 kΩ
      Seek+ switch pushed Below 2.5 Ω
      Seek- switch pushed 313 to 345 Ω
      Volume+ switch pushed 950 to 1050 Ω
      Volume- switch pushed 2955 to 3265 Ω
      H52-8 (SW2) - H52-6 (SWG) No switch pushed 95 to 105 kΩ
      MODE switch pushed Below 2.5 Ω
      Voice switch pushed 2955 to 3265 Ω
      On hook switch pushed 313 to 345 Ω
      Off hook switch pushed 950 to 1050 Ω
      for 6 Speakers
      Tester Connection Condition Specified Condition
      H47-21 (SW1) - H47-23 (SWG) No switch pushed 95 to 105 kΩ
      Seek+ switch pushed Below 2.5 Ω
      Seek- switch pushed 313 to 345 Ω
      Volume+ switch pushed 950 to 1050 Ω
      Volume- switch pushed 2955 to 3265 Ω
      H47-22 (SW2) - H47-23 (SWG) No switch pushed 95 to 105 kΩ
      MODE switch pushed Below 2.5 Ω
      Voice switch pushed*1 2955 to 3265 Ω
      On hook switch pushed*1 313 to 345 Ω
      Off hook switch pushed*1 950 to 1050 Ω

      • *1: w/ Telephone Microphone Assembly


    NG

    INSPECT STEERING PAD SWITCH ASSEMBLY Click here

    OK

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

  2. INSPECT STEERING PAD SWITCH ASSEMBLY


    1. Disconnect the steering pad switch assembly connector.

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

      A003VPTE03
      Standard Resistance
      Tester Connection Condition Specified Condition
      z4-11 (AU1) - z4-8 (EAU) No switch pushed 95 to 105 kΩ
      Seek+ switch pushed Below 2.5 Ω
      Seek- switch pushed 313 to 345 Ω
      Volume+ switch pushed 950 to 1050 Ω
      Volume- switch pushed 2955 to 3265 Ω
      z4-10 (AU2) - z4-8 (EAU) No switch pushed 95 to 105 kΩ
      MODE switch pushed Below 2.5 Ω
      Voice switch pushed*1 2955 to 3265 Ω
      On hook switch pushed*1 313 to 345 Ω
      Off hook switch pushed*1 950 to 1050 Ω

      • *1: w/ Telephone Microphone Assembly

      Text in Illustration
      *A w/ Telephone Microphone Assembly - -
      *a

      Component without harness connected

      (Steering Pad Switch Assembly)

      		 *b MODE
      *c Volume+ *d Volume-
      *e Seek+ *f Seek-
      *g Voice *h Off Hook
      *i On Hook - -

    NG

    REPLACE STEERING PAD SWITCH ASSEMBLY Click here

    OK

  3. INSPECT SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY


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

    2. A003XSFE03
      Text in Illustration
      *a

      Component without harness connected

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

      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 sub-assembly more than the specified amount.

      Tech Tips



    NG

    REPLACE SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY Click here

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR