Control Circuit Inspection

■ Open Check
1. IG "OFF".
2. Disconnect Brake Lamp Relay (DBC relay) and HECU connector.
3. Measure resistance between control terminal of brake lamp relay (DBC relay) harness connector and brake lamp control terminal of HECU harness connector.
  Specification: Approx. below 1Ω
  
  Fig 1: Measuring Resistance Between Control Terminal Of Brake Lamp Relay (DBC Relay) Harness Connector And Brake Lamp Control Terminal Of HECU Harness Connector
  Courtesy of HYUNDAI MOTOR AMERICA
4. Is the measured value within specifications?
  YES
  - Go to " SHORT CHECK" procedure.
  NO
  - Repair open in control circuit between the brake lamp relay and HECU and then, Go to "VERIFICATION OF VEHICLE REPAIR " procedure.
■ Short Check
1. IG "OFF".
2. Disconnect Brake Lamp Relay (DBC relay) and HECU connector.
3. Measure resistance between control terminal of brake lamp relay (DBC relay) harness connector and chassis ground.
  Specification: Infinite (∞ Ω)
  
  Fig 2: Measuring Resistance Between Control Terminal Of Brake Lamp Relay (DBC relay) Harness Connector And Chassis Ground
  Courtesy of HYUNDAI MOTOR AMERICA
4. Is the measured value within specifications?
  YES
  - Substitute with a known-good Brake Lamp Relay (DBC relay) and check for proper operation. If problem is corrected, replace Brake Lamp Relay (DBC relay) and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NO
  - Repair short in control circuit between Brake Lamp Relay (DBC relay) and HECU, and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.