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Signal Circuit Inspection

WARNING: This page is about a different car, the 2017 Kia K900. However, it is still accessible from the selected car via links, so may be relevant.
  1. IG "ON", Engine "ON".
  2. Perform "Oscilloscope" procedure in the "Diagnosis" with GDS.
  3. Set WIPER & MIST SWITCH" up "INT (Auto)".
  4. Measure the signal waveform between Pin No. 15 (LIN) terminal of "BCM" harness connector and chassis ground.

    Specification:  below image

    Fig 1: Screen Display - Normal Waveform Of LIN Communication
    G00576706Courtesy of KIA MOTOR AMERICA, INC.
  5. IG "OFF".
  6. Disconnect the BCM, Wiper Motor and Rain Sensor connector.
  7. Measure the voltage between Pin No. 3 (LIN) terminal of rain sensor harness connector and chassis ground.

    Specification:  Approx. 0V

  8. Measure the resistance between Pin No. 15 (LIN) terminal of BCM harness connector and Pin No. 3 (LIN) terminal of rain sensor harness connector.
  9. Measure the resistance between Pin No. 1 (LIN) terminal of wiper motor harness connector and Pin No. 3 (LIN) terminal of rain sensor harness connector.

    Specification:  below 1Ω

  10. Measure the resistance between Pin No. 3 (LIN) terminal of rain sensor harness connector and chassis ground.

    Specification:  ∞ (infinite)Ω

  11. Does the measured value and signal waveform follow the reference data?

    YES 

    • Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

    NO 

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