Ignition "ON"

Back probe and measure voltage between Pin No. 30 (Signal) terminal of HECU and chassis ground.

Operate brake pedal.

Is measured value within specification?

	▶ If no problems were found with the circuits or connectors, replace the HECU. Go to "Verification of Vehicle Repair" procedure.
	▶ If no problems were found with the circuits or connectors, replace the brake lamp switch. Go to "Verification of Vehicle Repair" procedure.

In case of replacing HECU, perform following procedures.

1. Perform "Auto Detected Configuration Reset(ESP(ESC) Only)" for Varian Coding

Fig.1) 1st Screen of Vehicle S/W Management

Fig.2) 1st Screen of "Auto Detected Configuration Reset(ESP(ESC) Only)"

Fig.3) Final Screen of "Auto Detected Configuration Reset(ESP(ESC) Only)"

2. Perform "Steering Angle Sensor Calibration" for steering angle sensor.

Fig.1) S/W Mangement Main Screen

Fig.2) Steering Angle Sensor Calibration Screen

Fig.3) Condition Check Screen

Fig.4) Complete

3. "Longitudinal G-Sensor Calibration(HAC/DBC Only)" for longitudinal sensor offset correction.

Fig.1) 1st Screen of Vehicle S/W Management

Fig.2) 1st Screen of "Longitudinal G-Sensor Calibration(HAC/DBC Only)"

Fig.3) Final Screen of "Longitudinal G-Sensor Calibration(HAC/DBC Only)"

4. "HCU Air Bleeding Mode" for removing air in the HECU.

Fig.1) 1st Screen of Vehicle S/W Management

Fig.2) 1st Screen of "HCU Air Bleeding Mode"

Fig.3) 2st Screen of "HCU Air Bleeding Mode"

Fig.4) Complete