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Home >> Hyundai >> 2015 >> Sonata Eco >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 57 (Engine Control System Diagnosis (2 Of 2) (HEV)) >> DTC P0504: Brake Switch 'A'/'B' Correlation >> W/Harness Inspection >> Power Circuit Inspection

Power Circuit Inspection

WARNING: This page is about a different variant/trim than selected.

■ Check for Open/Short on Power Circuit 

  1. Ignition "OFF".
  2. Disconnect Stop Lamp Switch.
  3. Measure voltage between Brake Light Switch terminal and chassis ground.
  4. Measure voltage between Brake Test Switch terminal and chassis ground.
  5. Ignition "ON".
  6. Measure voltage between Brake Light Switch terminal and chassis ground.
  7. Measure voltage between Brake Test Switch terminal and chassis ground.

    Specification 

    Test Condition IG "OFF" IG "ON"
    Brake Light Switch Battery Voltage Battery Voltage
    Brake Test Switch 0V Battery Voltage
    Fig 1: Measuring Voltage Between Brake Light And Test Switch Terminal And Chassis Ground
    G10606739Courtesy of HYUNDAI MOTOR AMERICA
  8. Is voltage within the specification?

    YES 

    • Go to next procedure.

    NO 

    • Check fuse between battery and Stop Lamp Switch.

      Check for Open or Short in power circuit.

      Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.