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

DTC Code DTC Name
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, also the radio receiver assembly itself will not function.

WIRING DIAGRAM

E224428E05

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.

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PROCEDURE

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

    1. Disconnect the E111 radio receiver assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E111-21 (SW1) - E111-23 (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

      E111-22 (SW2) - E111-23 (SWG)

      No switch pushed

      95 to 105 kΩ

      MODE/HOLD switch pushed

      Below 2.5 Ω

      On hook switch pushed*1

      313 to 345 Ω

      Off hook switch pushed*1

      950 to 1050 Ω

      • *1: w/ Microphone

    Result

    Proceed to

    OK

    NG
    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

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

      E275893C01

      *A

      w/ Microphone

      -

      -

      *a

      Component without harness connected

      (Steering Pad Switch Assembly)

      *b

      Volume+

      *c

      Volume-

      *d

      Seek-

      *e

      Seek+

      *f

      MODE/HOLD

      *g

      Off hook

      *h

      On hook

      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/HOLD switch pushed

      Below 2.5 Ω

      On hook switch pushed*1

      313 to 345 Ω

      Off hook switch pushed*1

      950 to 1050 Ω

      • *1: w/ Microphone

    Result

    Proceed to

    OK

    NG
    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.

      w/ VSC:Click here

      w/o VSC:Click here

    2. E263757C11

      *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

      z1-8 (EAU) - E6-3 (EAU)

      Center

      3 Ω or less

      2.5 rotations to the left

      2.5 rotations to the right

      z1-11 (AU1) - E6-6 (AU1)

      Center

      3 Ω or less

      2.5 rotations to the left

      2.5 rotations to the right

      z1-10 (AU2) - E6-5 (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

      z1-8 (EAU) - E6-3 (EAU)

      Always

      3 Ω or less

      z1-11 (AU1) - E6-6 (AU1)

      Always

      3 Ω or less

      z1-10 (AU2) - E6-5(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.

    Result

    Proceed to

    OK

    NG
    OK

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

    NG

    REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY

    w/ VSC:Click here

    w/o VSC:Click here