C1503

DTC C1503 TCS/ESC SWITCH ERROR

COMPONENT LOCATION:

GENERAL DESCRIPTION
The driver can deactivate ESC by pressing the ESC switch. The HECU will then activate the ESC warning lamp and deactivate ESC functions. If the ESC switch is pressed again, ESC functions are restored.

DTC DESCRIPTION
Trouble code is set when the condition that the level of ESC switch is high for 60sec.When the ESC switch failure is set there is no signal in the warning lamp and ABS/EBD control is available.

DTC DETECTING CONDITION:

TERMINAL & CONNECTOR INSPECTION
Refer to DTC C1102. C1102

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





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.

COMPONENT INSPECTION
1. Ignition "ON".
2. Disconnect ESC switch connector.
3. Press the ESC switch.
4. Measure resistance between terminal "1" of the ESC switch harness connector and terminal "4" of the ESC switch harness connector.





5. Is the measured resistance within specifications?
YES
^ Fault is intermittent caused by inoperative 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