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Home >> Kia >> 2019 >> Optima EX >> Repair and Diagnosis >> Brakes >> Parking Brake System >> Electric Parking Brake Diagnosis (Except HEV) >> DTC C1604-04: ECU Hardware Error >> Wiring Inspection >> Ground Circuit Inspection

Ground Circuit Inspection

  1. Ignition switch "OFF"
  2. Disconnect battery (-) cable.
  3. Refer to "ABS CONTROL UNIT " and disconnect HECU connector.
  4. Measure the resistance between Pin No. 1, 46 (Ground) terminal of HECU and chassis ground.

    Specification:  Approx. below 1 Ω

  5. Ignition switch "OFF"
  6. Refer to "ABS CONTROL UNIT " and disconnect HECU connector.
  7. Ignition switch "ON"
  8. Measure the voltage between Pin No. 37 (IG1) terminal of HECU harness connector and chassis ground.(A)
  9. Measure the voltage between Pin No. 37 (IG1) terminal and Pin No. 1, 46 (Ground) terminal of HECU harness connector.(B)

    Specification:  Difference in (A) and (B) is less than 200 mV

  10. Is the measured value within specification?

    YES 

    NO 

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