AUDIO AND VISUAL SYSTEM Steering Pad Switch Circuit

DESCRIPTION

This circuit sends an operation signal from the steering pad switch assembly to the radio and display 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 and display receiver assembly cannot be operated using the steering pad switch assembly, and also the radio and display receiver assembly itself cannot function.

WIRING DIAGRAM

A01EJM0E46

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 E42 radio and display receiver assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E42-21 (SW1) - E42-23 (SWG) No switch pushed 95 to 105 kΩ
      Up switch pushed Below 2.5 Ω
      Down switch pushed 313 to 345 Ω
      Volume+ switch pushed 950 to 1050 Ω
      Volume- switch pushed 2955 to 3265 Ω
      E42-22 (SW2) - E42-23 (SWG) No switch pushed 95 to 105 kΩ
      MODE/HOLD 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*1 2955 to 3265 Ω
      E42-24 (SW3) - E42-23 (SWG) No switch pushed 95 to 105 kΩ
      Enter switch pushed Below 2.5 Ω
      Back switch pushed 313 to 345 Ω
      Right switch pushed 950 to 1050 Ω
      Left switch pushed 2955 to 3265 Ω

      • *1: w/ Voice Switch of Steering Pad Switch 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. Remove the steering pad switch assembly.

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

      A01EL1VE09
      Standard Resistance
      Tester Connection Condition Specified Condition
      10 (AU1) - 7 (EAU) No switch pushed 95 to 105 kΩ
      Up switch pushed Below 2.5 Ω
      Down switch pushed 313 to 345 Ω
      Volume+ switch pushed 950 to 1050 Ω
      Volume- switch pushed 2955 to 3265 Ω
      9 (AU2) - 7 (EAU) No switch pushed 95 to 105 kΩ
      MODE/HOLD 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*1 2955 to 3265 Ω
      8 (AU3) - 7 (EAU) No switch pushed 95 to 105 kΩ
      Enter switch pushed Below 2.5 Ω
      Back switch pushed 313 to 345 Ω
      Right switch pushed 950 to 1050 Ω
      Left switch pushed 2955 to 3265 Ω

      • *1: w/ Voice Switch of Steering Pad Switch Assembly

      Text in Illustration
      *A w/ Voice Switch of Steering Pad Switch Assembly - -
      *a

      Component without harness connected

      (Steering Pad Switch Assembly)

      		 *b Volume+
      *c Volume- *d Back
      *e MODE/HOLD *f Up
      *g Down *h Left
      *i Right *j Enter
      *k Off hook *l On hook
      *m Voice - -

    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.

    2. A01EMLSE24
      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
      z5-7 (EAU) - D18-3 (EAU) Center Below 1 Ω
      2.5 rotations to the left
      2.5 rotations to the right
      z5-10 (AU1) - D18-6 (AU1) Center Below 1 Ω
      2.5 rotations to the left
      2.5 rotations to the right
      z5-9 (AU2) - D18-5 (AU2) Center Below 1 Ω
      2.5 rotations to the left
      2.5 rotations to the right
      z5-8 (AU3) - D18-4 (AU3) Center Below 1 Ω
      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
      z5-7 (EAU) - D18-3 (EAU) Always Below 1 Ω
      z5-10 (AU1) - D18-6 (AU1) Always Below 1 Ω
      z5-9 (AU2) - D18-5 (AU2) Always Below 1 Ω
      z5-8 (AU3) - D18-4 (AU3) Always Below 1 Ω

      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.

      • 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.


    NG

    REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY Click here

    OK

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