Connect GDS and select "Diagnostic Trouble Codes(DTC)" mode.

Confirm that "DTC Readiness Flag" indicates "COMPLETED". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.

Read "DTC Status" parameter in DTC menu of the GDS.

Is parameter displayed "History(Not Present) fault" ?

	▶ Fault is intermittent caused by poor connection in power harness (IGN+) and/or HECU's connector or was repaired and HECU memory was not cleared. Go to "Verification of Vehicle Repair" procedure.
	▶ Go to next step.

Connect GDS to Data Link Connector(DLC).

IG "ON".

Monitor the 'ON-OFF' condition of Brake lamp switch on the “Current Data” menu of the GDS.

Fig.1) Normal Data at IG "ON"

Is parameter displayed within specifications ?

	▶ Fault is intermittent caused by poor connection. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary, and then go to "Verification of Vehicle Repair" procedure.
	▶ Go to next step.