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Signal Circuit Inspection

  1. Ignition "ON" & Engine "OFF".
  2. Press the brake pedal.
  3. Measure voltage between the terminal "30" of the HECU harness connector and chassis ground.

    Specification : Brake Switch - Approx. B+

    Fig 1: Measuring Voltage Between Terminal 30 Of HECU Harness Connector And Chassis Ground
    G04880971Courtesy of HYUNDAI MOTOR CO.
  4. Is the measured voltage within specifications?

    YES 

    • Fault is intermittent caused by open or short harness in brake light switch, inoperative brake lamp switch or was repaired and HECU memory was not cleared. Go to the applicable troubleshooting procedure.

    NO 

    • Check for open or blown 15 A STOP fuse referring to "Circuit Diagram". Check for damaged harness and poor connection in the power harness between the battery terminal (+) and the terminal "30" of the HECU harness connector. Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure. If OK, Go to "COMPONENT INSPECTION " Procedure.
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