NAVIGATION SYSTEM(for Radio and Display Type) Steering Pad Switch Circuit

DESCRIPTION

This circuit sends an operation signal from the steering pad switch to the radio and display receiver assembly.

If there is an open in the circuit, the audio system cannot be operated using the steering pad switch.

If there is a short in the circuit, the same condition as when a switch is continuously depressed occurs.

Therefore, the radio and display receiver assembly cannot be operated using the steering pad switch, and also the radio and display receiver assembly itself cannot function.

WIRING DIAGRAM

B005Y39E12

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 Click here.

PROCEDURE


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


    1. Disconnect the L35 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
      L35-21 (SW1) - L35-23 (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
      L35-22 (SW2) - L35-23 (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
      Voice switch pushed 3048 to 3172 Ω

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

  2. INSPECT STEERING PAD SWITCH LH


    1. Remove the steering pad switch LH Click here.

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

      B005Z22E01
      Text in Illustration
      *a

      Component without harness connected

      (Steering Pad Switch LH)

      		 *b Volume+
      *c Seek+ *d MODE
      *e Volume- *f Seek-
      *g Voice *h On hook
      *i Off hook - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      4 (AU1) - 1 (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
      3 (AU2) - 1 (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
      Voice switch pushed 3048 to 3172 Ω

    NG

    REPLACE STEERING PAD SWITCH LH Click here

    OK

  3. INSPECT STEERING PAD SWITCH LH


    1. Remove the steering pad switch RH Click here.

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

      B005ZNVE01
      Text in Illustration
      *a

      Component without harness connected

      (Steering Pad Switch RH)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      SR2-4 (AU1) - z9-6 (AU1) Always Below 1 Ω
      SR2-3 (AU2) - z9-7 (AU2) Always Below 1 Ω
      SR2-1 (EAU) - z9-8 (EAU) Always Below 1 Ω

    NG

    REPLACE STEERING PAD SWITCH RH Click here

    OK

  4. INSPECT SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY


    1. Remove the spiral cable with sensor sub-assembly Click here.

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

      B005XHOE05
      Text in Illustration
      *a

      Component without harness connected

      (Spiral Cable with Sensor Sub-assembly)
      *b Steering Pad Switch Side
      *c Vehicle Side
      Standard Resistance
      Tester Connection Condition Specified Condition
      z9-8 (EAU) - L52-4 (EAU) Center 3 Ω or less
      2.5 rotations to the left
      2.5 rotations to the right
      z9-6 (AU1) - L52-6 (AU1) Center 3 Ω or less
      2.5 rotations to the left
      2.5 rotations to the right
      z9-7 (AU2) - L52-5 (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
      z9-8 (EAU) - L52-4 (EAU) Always 3 Ω or less
      z9-6 (AU1) - L52-6 (AU1) Always 3 Ω or less
      z9-7 (AU2) - L52-5 (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.


    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY - RADIO AND DISPLAY RECEIVER ASSEMBLY, BODY GROUND)

    NG

    REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY Click here