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Home › Hyundai › 2007 › Santa Fe GLS, AWD, Automatic › Repair and Diagnosis › Brakes › Traction Control › ESC (Electronic Stability Control) System › Esp/ESC System › DTC C1503 TCS/ESC Switch Error › Signal Circuit Inspection

Signal Circuit Inspection

  1. Ignition "ON" & Engine "OFF" & ESC Switch "ON".
  2. Measure voltage between terminal "31" of the HECU harness connector and chassis ground.

    Specification : Approx B+

    Fig 1: Measuring Voltage Between Terminal 31 Of HECU Harness Connector And Chassis Ground
    G05350774Courtesy of HYUNDAI MOTOR CO.
  3. Is the measured voltage within specifications?

    YES 

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

    NO 

    • Check for damaged harness and poor connection in the power harness between the battery terminal (+) and the terminal "31" of the HECU harness connector. Check for open or blown 10 A fuse referring to "CIRCUIT DIAGRAM ". Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
    • If OK, Go to "COMPONENT INSPECTION " Procedure.
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