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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 >> DTC Inspection >> GDS data analysis

GDS data analysis

WARNING: This page is about a different variant/trim than selected.
  1. Connect GDS and select "Current Data" mode
  2. Warm up the engine.
  3. Monitor the parameters related to DTC on the "Current Data" menu of the GDS below with pressing brake pedal.
    Fig 1: Scantool Display - Brake Lamp Switch And Brake Test Switch Signals Switched To ON (When Brake Pedal Depressed)
    G11991842Courtesy of HYUNDAI MOTOR AMERICA
  4. Is parameter displayed within specifications?

    YES 

    • Fault is intermittent caused by poor contact in the sensor's and/or PCM's connector. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.

    NO 

    • Go to next step.
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