Component Inspection

Brake light switch Check
1. IG "OFF".
2. Disconnect the brake light switch connector.
3. Measure resistance between power terminal and signal terminal of the brake light switch connector.
  Specification:
  
  Resistance between terminals of the brake light switch - ∞ Ω (when the plunger is pushed down), 0Ω (when the plunger isn't pushed down).
  
  Resistance between the terminals of the brake switch - ∞ Ω (when the plunger is not pushed down), 0Ω (when the plunger is pushed down).
  
  Fig 1: Measuring Resistance Between Power Terminal And Signal Terminal Of Brake Light Switch Connector
  Courtesy of HYUNDAI MOTOR AMERICA
4. Is the measured value within specifications?
  YES
  - Fault is intermittent caused by poor connection in brake light switch harness and/or HECU's connector. Go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NO
  - Substitute with a known-good brake light switch and check for proper operation. If problem is corrected, replace brake light switch and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.