Inspection Procedure

1. Remove the TCS (ESP) OFF switch from the panel of the driver's side crashpad.
2. Check for the continuity between the TCS (ESP) OFF switch terminals, when the TCS (ESP) OFF switch is ON.
   Fig 1: Identifying TCS (ESP) Off Switch From Panel Of Driver's Side Crashpad

   Courtesy of HYUNDAI MOTOR CO.

Is there continuity between terminals 3 and 4 of the TCS (ESP) switch connector?

Fig 2: Terminal Continuity Chart

Courtesy of HYUNDAI MOTOR CO.

NO 

• Replace with a new TCS (ESP) OFF switch.

YES 

• Check short in circuit of TCS/ESC Switch

1. Remove the TCS (ESP) OFF switch from the panel of the driver's side crashpad.
2. After the ignition switch is ON, measure the voltage between terminal 3 of the TCS (ESP) OFF switch connector and the body ground.

   Specification: Battery positive (B+)

Is the voltage within the specification?

NO 

1. Check and replace fuse (10A).
2. Check and repair harness and connector.

YES 

• Check open/short in circuit between TCS (ESP) OFF switch and the HECU.

Check an open or short in the circuit between terminal 3 of TCS (ESP) OFF switch connector and terminal 14 (ESP: 27) of the HECU connector.

Is the circuit normal?

NO 

• Check and repair the circuit between the switch and the HECU.

YES 

• After clearing the DTC and driving the vehicle at 40Km/h speed or more, if the TCS (ESP) lamp is ON and the same DTC shows again, replace the HECU and recheck.