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Steering Pad Switch Circuit: Procedure

  1. CHECK HARNESS AND CONNECTOR (STEERING PAD SWITCH SIGNAL) 
    1. Disconnect the 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
      L189-21 (SW1) - L189-23 (SWG) No switch pushed 95 to 105 kΩ
      Seek+ switch pushed Below 2.5 Ω
      Seek- switch pushed 323 to 335 Ω
      Volume+ switch pushed 980 to 1020 Ω
      Volume- switch pushed 3048 to 3172 Ω
      L189-22 (SW2) - L189-23 (SWG) No switch pushed 95 to 105 kΩ
      MODE switch pushed Below 2.5 Ω
      On hook switch pushed 323 to 335 Ω
      Off hook switch pushed 980 to 1020 Ω

    NG → See step   2 

    OK → See step   5 

  2. INSPECT STEERING PAD SWITCH ASSEMBLY 
    1. Disconnect the steering pad switch assembly connector.
      Fig 1: Identifying Steering Pad Switch Assembly
      GTY327714Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      z9-10 (AU1) - z9-8 (EAU) No switch pushed 95 to 105 kΩ
      Seek+ switch pushed Below 2.5 Ω
      Seek- switch pushed 323 to 335 Ω
      Volume+ switch pushed 980 to 1020 Ω
      Volume- switch pushed 3048 to 3172 Ω
      z9-9 (AU2) - z9-8 (EAU) No switch pushed 95 to 105 kΩ
      MODE switch pushed Below 2.5 Ω
      On hook switch pushed 323 to 335 Ω
      Off hook switch pushed 980 to 1020 Ω
      TEXT IN ILLUSTRATION

      *a Component without harness connected
      (Steering Pad Switch Assembly)      		 *b Seek+
      *c Seek- *d Volume+
      *e Volume- *f MODE
      *g On hook *h Off hook
    3. Proceed to the next step based on the inspection result.

      Result

      Result Proceed to
      NG A
      OK B

    B → See step   4 

    A: Go to next step 

  3. INSPECT STEERING PAD SWITCH RH 
    1. Disconnect the steering pad switch RH connectors.
    2. w/ Touch Tracer Display:
      Fig 2: Identifying RH Steering Pad Switch Assembly
      GTY340239Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        SR1-3 (AU1) - z9-10 (AU1) Always Below 1 Ω
        SR1-5 (EAU) - z9-8 (EAU) Always Below 1 Ω
        SR1-4 (AU2) - z9-9 (AU2) Always Below 1 Ω
        TEXT IN ILLUSTRATION

        *a Component without harness connected
        (Steering Pad Switch RH)        		 - -
    3. w/o Touch Tracer Display:
      Fig 3: Identifying RH Steering Pad Switch Assembly
      GTY335217Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        SR2-4 (AU1) - z9-10 (AU1) Always Below 1 Ω
        SR2-1 (EAU) - z9-8 (EAU) Always Below 1 Ω
        SR2-3 (AU2) - z9-9 (AU2) Always Below 1 Ω
        TEXT IN ILLUSTRATION

        *a Component without harness connected
        (Steering Pad Switch RH)        		 - -

    NG → See step   8 

    OK → See step   7 

  4. INSPECT SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY 
    1. Disconnect the steering pad switch assembly connector.
    2. Disconnect the spiral cable with sensor sub-assembly connector.
    3. Measure the resistance according to the value(s) in the table below.
      Fig 4: Identifying Spiral With Sensor Cable Sub-Assembly
      GTY338635Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      z9-8 (EAU) - L52-4 (EAU) Center Below 3 Ω
      2.5 rotations to the left
      2.5 rotations to the right
      z9-10 (AU1) - L52-6 (AU1) Center Below 3 Ω
      2.5 rotations to the left
      2.5 rotations to the right
      z9-9 (AU2) - L52-5 (AU2) Center Below 3 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
      z9-8 (EAU) - L52-4 (EAU) Always Below 3 Ω
      z9-10 (AU1) - L52-6 (AU1) Always Below 3 Ω
      z9-9 (AU2) - L52-5 (AU2) Always Below 3 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 information 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.

      HINT: 

      TEXT IN ILLUSTRATION

      *a Component without harness connected
      (Spiral Cable with Sensor Sub-assembly)
      *b Steering Pad Switch Assembly Side
      *c Vehicle Side

    NG → See step   6 

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

  5. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE 
  6. REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY. Refer to  REMOVAL 
  7. REPLACE STEERING PAD SWITCH LH. Refer to  REMOVAL 
  8. REPLACE STEERING PAD SWITCH RH. Refer to  REMOVAL 
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