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Steering Pad Switch Circuit [08/2013 - ]: Procedure

WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT STEERING PAD SWITCH ASSEMBLY 
    1. Remove the horn button assembly. Refer to REMOVAL [08/2013 - ] .
    2. Disconnect the z5 spiral cable with sensor sub-assembly connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY396322Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Lane Departure Alert Main Switch - -
      *a Component without harness connected
      (Steering Pad Switch Assembly)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      z5-4 (DIST) - z5-7 (ECC) Lane departure alert main switch being pushed and held 228 to 252 Ω
      Lane departure alert main switch not pushed 10 kΩ or higher
    4. Reconnect the z5 spiral cable with sensor sub-assembly connector.
    5. Reinstall the horn button assembly. Refer to INSTALLATION [08/2013 - ] .

    NG → See step   6 

    OK: Go to next step 

  2. INSPECT SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY 
    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 cause airbag deployment. Be sure to read the information shown in the brackets.

    HINT: 

    1. Remove the spiral cable with sensor sub-assembly.
    2. Measure the resistance according to the value(s) in the table below.
      GTY417998Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      z5-4 (DIST) - H22-12 (DIST) The spiral cable with sensor sub-assembly position is center 3 Ω or less
      The spiral cable with sensor sub-assembly position is 2.5 rotations to the left
      The spiral cable with sensor sub-assembly position is 2.5 rotations to the right
      z5-7 (ECC) - H22-2 (ECC) The spiral cable with sensor sub-assembly position is center 3 Ω or less
      The spiral cable with sensor sub-assembly position is 2.5 rotations to the left
      The spiral cable with sensor sub-assembly position is 2.5 rotations to the right
      TEXT IN ILLUSTRATION

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

      HINT: 

      The spiral cable with sensor sub-assembly makes a maximum of approximately 5 rotations.

    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
      z5-4 (DIST) - H22-12 (DIST) Always 3 Ω or less
      z5-7 (ECC) - H22-2 (ECC) Always 3 Ω or less

      HINT: 

      The spiral cable with sensor sub-assembly makes a maximum of approximately 5 rotations.

    4. Reinstall the spiral cable with sensor sub-assembly.

    NG → See step   7 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY - LANE DEPARTURE WARNING CAMERA) 
    1. Disconnect the H22 spiral cable with sensor sub-assembly connector.
    2. Disconnect the T12 lane departure warning camera connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      H22-12 (DIST) - T12-4 (LKSW) Always 3 Ω or less

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      H22-12 (DIST) or T12-4 (LKSW) - Body ground Always 1 MΩ or higher
    4. Reconnect the T12 lane departure warning camera connector.
    5. Reconnect the H22 spiral cable with sensor sub-assembly connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY - BODY GROUND) 
    1. Disconnect the H22 spiral cable with sensor sub-assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      H22-2 (ECC) - Body ground Always Below 1 Ω
    3. Reconnect the H22 spiral cable with sensor sub-assembly connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   5 

  5. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [08/2013 - ] 
  6. REPLACE STEERING PAD SWITCH ASSEMBLY. Refer to  REMOVAL [08/2013 - ] 
  7. REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY. Refer to  REMOVAL [08/2013 - ] 
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