Component Inspection

Brake light switch Check
1. Ignition "OFF" & Engine "OFF".
2. Disconnect the brake light switch connector.
3. Measure resistance between power terminal and signal terminal of the brake light switch A, B connector.
  Specification: Resistance between terminals of the brake light switch A - ∞ Ω (when the plunger is pushed down), 0 Ω (when the plunger isn't pushed down).
  
  Resistance between the terminals of the brake light switch B - Ω (when the plunger is not pushed down), 0 Ω (when the plunger is pushed down).
  
  Fig 1: Measuring Resistance Between Power Terminal & Signal Terminal Of Brake Light Switch A, B Connector
  Courtesy of KIA MOTORS AMERICA, INC.
4. Is the measured value within specifications?
  YES
  - Fault is intermittent caused by poor connection in brake light switch harness and/or HECUs 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.