AUDIO AND VISUAL SYSTEM (for Radio Receiver Type) Steering Pad Switch Circuit

DESCRIPTION

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

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

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 LH, and also the radio receiver assembly itself cannot function.

WIRING DIAGRAM

A01HSFDE09

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
      Tester Connection Condition Specified Condition
      I150-21 (SW1) - I150-23 (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
      I150-22 (SW2) - I150-23 (SWG) No switch pushed 95 to 105 kΩ
      MODE/HOLD switch pushed Below 2.5 Ω

    NG

    INSPECT STEERING PAD SWITCH LH Click here

    OK

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

  2. INSPECT STEERING PAD SWITCH LH


    1. Disconnect the steering pad switch LH connector.

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

      A01HW3CE03
      Standard Resistance
      Tester Connection Condition Specified Condition
      z3-11 (AU1) - z3-8 (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
      z3-10 (AU2) - z3-8 (EAU) No switch pushed 95 to 105 kΩ
      MODE/HOLD switch pushed Below 2.5 Ω
      Text in Illustration
      *a

      Component without harness connected

      (Steering Pad Switch LH)

      		 *b Volume+
      *c Volume- *d Seek-
      *e Seek+ *f MODE/HOLD

    NG

    REPLACE STEERING PAD SWITCH LH Click here

    OK

  3. INSPECT SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY


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

    2. A01HTGFE08
      Text in Illustration
      *a

      Component without harness connected

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z3-8 (EAU) - I28-3 (EAU) Center 3 Ω or less
      2.5 rotations to the left
      2.5 rotations to the right
      z3-11 (AU1) - I28-6 (AU1) Center 3 Ω or less
      2.5 rotations to the left
      2.5 rotations to the right
      z3-10 (AU2) - I28-5 (AU2) Center 3 Ω or less
      2.5 rotations to the left
      2.5 rotations to the right

    3. 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
      z3-8 (EAU) - I28-3 (EAU) Always 3 Ω or less
      z3-11 (AU1) - I28-6 (AU1) Always 3 Ω or less
      z3-10 (AU2) - I28-5 (AU2) Always 3 Ω or less

      Note


      • Press and hold the lock located in the center of the spiral cable with sensor sub-assembly to rotate the spiral cable with sensor sub-assembly.

      • 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 (RADIO RECEIVER ASSEMBLY - SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY)