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AUDIO AND VISUAL SYSTEM (w/ Multi-display) Steering Pad Switch Circuit

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DTC Code DTC Name
  Steering Pad Switch Circuit
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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 and visual 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.

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WIRING DIAGRAM

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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).

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PROCEDURE


  1. Click here

    CHECK HARNESS AND CONNECTOR (STEERING PAD SWITCH SIGNAL)


    1. Disconnect the G37 radio receiver assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G37-21 (SW1) - G37-23 (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
      G37-22 (SW2) - G37-23 (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

  2. Click here

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLEClick here

  3. Click here

    INSPECT STEERING PAD SWITCH ASSEMBLY


    1. A01NIVZE07

      Disconnect the z39 steering pad switch assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z39-11 (AU1) - z39-9 (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
      z39-10 (AU2) - z39-9 (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
      Table 1. Text in Illustration
      *a

      Component without harness connected

      (Steering Pad Switch Assembly)

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

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    INSPECT SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY


    1. Disconnect the z39 steering pad switch assembly connector.

    2. Disconnect the F108 spiral cable with sensor sub-assembly connector.

    3. A01NL1WE18

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z39-9 (EAU) - F108-4 (EAU) Center Below 1 Ω
      2.5 rotations to the left
      2.5 rotations to the right
      z39-11 (AU1) - F108-6 (AU1) Center Below 1 Ω
      2.5 rotations to the left
      2.5 rotations to the right
      z39-10 (AU2) - F108-5 (AU2) Center Below 1 Ω
      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
      z39-9 (EAU) - F108-4 (EAU) Always Below 1 Ω
      z39-11 (AU1) - F108-6 (AU1) Always Below 1 Ω
      z39-10 (AU2) - F108-5 (AU2) 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. 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.

      Tip:
      Table 2. Text in Illustration
      *a

      Component without harness connected

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

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    REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLYClick here

  6. Click here

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

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    REPLACE STEERING PAD SWITCH ASSEMBLYClick here