AUDIO AND VISUAL SYSTEM (w/o Multi-display) 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 this circuit, the audio system cannot be operated using the steering pad switch assembly.

If there is a short in this 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

A01G8AUE01

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 H83 radio receiver assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H83-7 (SW1) - H83-6 (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
      H83-8 (SW2) - H83-6 (SWG) No switch pushed 95 to 105 kΩ
      MODE switch pushed Below 2.5 Ω
      Voice switch pushed 2955 to 3265 Ω
      Voice Return switch pushed 313 to 345 Ω
      On hook switch pushed
      Off hook switch pushed 950 to 1050 Ω

    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 z5 steering pad switch assembly connector.

    2. Measure the resistance according to the values in the table below.

      A01G628E04
      Standard Resistance
      Tester Connection Condition Specified Condition
      z5-11 (AU1) - z5-8 (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
      z5-10 (AU2) - z5-8 (EAU) No switch pushed 95 to 105 kΩ
      MODE switch pushed Below 2.5 Ω
      Voice switch pushed 2955 to 3265 Ω
      Voice Return switch pushed 313 to 345 Ω
      On hook switch pushed
      Off hook switch pushed 950 to 1050 Ω
      Text in Illustration
      *a

      Component without harness connected

      (Steering Pad Switch Assembly)

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

    NG

    REPLACE STEERING PAD SWITCH ASSEMBLY Click here

    OK

  3. INSPECT SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY


    1. Disconnect the z5 steering pad switch assembly connector.

    2. Disconnect the H22 spiral cable with sensor sub-assembly connector.

    3. A01G59PE37
      Text in Illustration
      *a

      Component without harness connected

      (Spiral Cable with Sensor 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
      z5-8 (EAU) - H22-3 (EAU) Center 3 Ω or less
      2.5 rotations to the left
      2.5 rotations to the right
      z5-11 (AU1) - H22-6 (AU1) Center 3 Ω or less
      2.5 rotations to the left
      2.5 rotations to the right
      z5-10 (AU2) - H22-5 (AU2) Center 3 Ω or less
      2.5 rotations to the left
      2.5 rotations to the right

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z5-8 (EAU) - H22-3 (EAU) Always 3 Ω or less
      z5-11 (AU1) - H22-6 (AU1) Always 3 Ω or less
      z5-10 (AU2) - H22-5 (AU2) Always 3 Ω or less

      Note


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

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

      Tech Tips



    NG

    REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY Click here

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (SPIRAL CABLE WITH SENSOR SUB ASSEMBLY - RADIO RECEIVER ASSEMBLY)