AUDIO AND VISUAL SYSTEM(for Radio and Display Type) 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 the radio receiver assembly itself will not function.

WIRING DIAGRAM

A004ZB6E54

CAUTION / NOTICE / HINT

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 H164 radio receiver assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H164-21 (SW1) - H164-23 (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
      H164-22 (SW2) - H164-23 (SWG) No switch pushed 95 to 105 kΩ
      MODE switch pushed Below 2.5 Ω
      On hook switch pushed 313 to 345 Ω
      Off hook switch pushed 950 to 1050 Ω
      Voice switch pushed 2955 to 3265 Ω

    OK

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

    NG

  2. INSPECT STEERING PAD SWITCH ASSEMBLY


    1. Remove the steering pad switch assembly Click here.

      A004ZXJE06
      Text in Illustration
      *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 - -

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

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

    NG

    REPLACE STEERING PAD SWITCH ASSEMBLY Click here

    OK

  3. INSPECT SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY


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

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

      B001MW3E01
      Standard Resistance
      Tester Connection Condition Specified Condition
      z4-8 (EAU) - H30-3 (EAU) Center 3 Ω or less
      2.5 rotations to the left
      2.5 rotations to the right
      z4-11 (AU1) - H30-6 (AU1) Center 3 Ω or less
      2.5 rotations to the left
      2.5 rotations to the right
      z4-10 (AU2) - H30-5 (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 according to the value(s) in the table below.

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

      • 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.

      Text in Illustration
      *a

      Component without harness connected

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

    OK

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

    NG

    REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY Click here