Control Circuit Inspection

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