C1503

DTC C1503 ESC SWITCH ERROR

COMPONENT LOCATION:

GENERAL DESCRIPTION
Driver can inhibit the ESC control by ESC switch. When switch signal send into HECU, ESC warning lamp go ON and ESC control is stopped and if next switch signal is inputted again, ESC control is ready. This function is used for sporty driving or vehicle inspection.

DTC DESCRIPTION
Trouble code is set when the condition that the level of ESC switch is high is continued for 60secondsWhen the ESC switch failure is set there is no signal in the warning lamp and HECU inhibit the ESC control and allow the ABS/EBD control.

DTC DETECTING CONDITION

DTC DETECTING CONDITION:

TERMINAL & CONNECTOR INSPECTION
Refer to DTC C1101. C1101

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: Approximately B+
Is the measured voltage within specifications?
YES
- Fault is intermittent caused by open or short in ESC switch line, faulty 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 10A fuse referring to Circuit Diagram". Repair as necessary and then go to "Verification of vehicle Repair procedure.

COMPONENT INSPECTION
1. Ignition "OFF".
2. Disconnect ESC switch connector.
3. Press the ESC switch.





4. Measure resistance between terminal 2 of the ESC switch harness connector and terminal 5 of the ESC switch harness connector.
Specification: Approximately below 1 Ohm
Is the measured resistance within specifications?
YES
- Fault is intermittent caused by faulty ESC switch or was repaired and HECU memory was not cleared. Go to the applicable troubleshooting procedure.
NO
- Substitute with a known-good ESC switch and check for proper operation. If problem is corrected, replace ESC switch and then go to "Verification of Vehicle Repair procedure.

VERIFICATION OF VEHICLE REPAIR
Refer to DTC C1101. C1101