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Home >> Chevrolet >> 2021 >> Trailblazer L >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Vehicle Access System >> Diagnostic Information and Procedures >> DTC P257D-P257F >> Component Testing

Component Testing

Static Test

  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: B55 Hood Ajar Switch
  3. Test for 658 to 806 ohms between the test points:
    • Signal terminal A & Ground terminal C - The switch is in the closed position.
    • Signal terminal B & Ground terminal C - The switch is in the closed position.
    • If not between 658 and 806 ohms 

      Replace the component: B55 Hood Ajar Switch

    • Go to next step: If between 658 and 806 ohms 
  4. Test for 2080 to 2545 ohms between the test points:
    • Signal terminal A & Ground terminal C - The switch is in the open position.
    • Signal terminal B & Ground terminal C - The switch is in the open position.
    • If not between 2080 and 3545 ohms 

      Replace the component: B55 Hood Ajar Switch

    • Go to next step: If between 2080 and 3545 ohms 
  5. All OK.
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