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Home >> Hyundai >> 2017 >> Sonata Base >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 42 (Engine Control System Diagnosis - 2.0L (2 Of 3) (Except HEV)) >> DTC P0504: Brake Switch 'A'/'B' Correlation >> Wiring Inspection >> Power Circuit Inspection

Power Circuit Inspection

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

■ Check voltage 

  1. IG "OFF". Disconnect Stop Lamp Switch connector.
  2. Measure voltage between Brake Light Switch terminal and chassis ground.
  3. Measure voltage between Brake Test Switch terminal and chassis ground.
  4. IG "ON".
  5. Measure voltage between Brake Light Switch terminal and chassis ground.
  6. Measure voltage between Brake Test Switch terminal and chassis ground.
    Test Condition Brake Test Switch Brake Light Switch
    IG ON Battery Voltage Battery Voltage
    IG OFF Approx. 0 V Approx. 0 V
  7. Is the measured voltage within 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.
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