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Steering Pad Switch Circuit [10/2014 - ]: Procedure

  1. CHECK HARNESS AND CONNECTOR (STEERING PAD SWITCH SIGNAL) 
    1. Disconnect the I8 navigation ECU sub-assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I8-21 (SW1) - I8-23 (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
      I8-22 (SW2) - I8-23 (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 2955 to 3265 Ω
      I8-24 (SW3) - I8-23 (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

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

    (Refer to PROBLEM SYMPTOMS TABLE [10/2014 - 10/2015] or PROBLEM SYMPTOMS TABLE [10/2015 - ] )

    Result: 

    NG 

    See step  2

  2. INSPECT STEERING PAD SWITCH ASSEMBLY 
    1. Remove the steering pad switch assembly (Refer to REMOVAL [10/2014 - ] ).
      GTY565516Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *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 - -
    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
      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
      10 (AU2) - 8 (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 2955 to 3265 Ω
      9 (AU3) - 8 (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

    Result: 

    NG 

    REPLACE STEERING PAD SWITCH ASSEMBLY 

    (Refer to REMOVAL [10/2014 - ] )

    Result: 

    OK 

    See step  3

  3. INSPECT SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY 
    1. Remove the spiral cable with sensor sub-assembly (Refer to REMOVAL [10/2014 - ] ).
    2. Measure the resistance according to the value(s) in the table below.
      GTY599271Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      z3-8 (EAU) - I28-3 (EAU) Center 3 Ω or less
      2.5 rotations to the left
      2.5 rotations to the right
      z3-11 (AU1) - I28-6 (AU1) Center 3 Ω or less
      2.5 rotations to the left
      2.5 rotations to the right
      z3-10 (AU2) - I28-5 (AU2) Center 3 Ω or less
      2.5 rotations to the left
      2.5 rotations to the right
      z3-9 (AU3) - I28-4 (AU3) 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
      z3-8 (EAU) - I28-3 (EAU) Always 3 Ω or less
      z3-11 (AU1) - I28-6 (AU1) Always 3 Ω or less
      z3-10 (AU2) - I28-5 (AU2) Always 3 Ω or less
      z3-9 (AU3) - I28-4 (AU3) 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 - -

    Result: 

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (NAVIGATION ECU SUB-ASSEMBLY - SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY) 

    Result: 

    NG 

    REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY 

    (Refer to REMOVAL [10/2014 - ] )

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