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Home >> Chevrolet >> 2018 >> Suburban 3500 HD LS >> Repair and Diagnosis >> Body & Frame >> Exterior Body Panels >> Bolted Exterior Body Panels And Closures >> Diagnostic Information And Procedures >> DTC P257D-P257F: Engine Hood Switch >> Component Testing

Component Testing

  1. Ignition OFF, disconnect the harness connector at the B55 Hood Ajar Switch.
  2. Test for 2738 - 3350 Ω between the signal terminal A and the signal terminal B with the hood latch in the CLOSED position.
    • If not between 2738 - 3350 Ω 

      Replace the B55 Hood Ajar Switch.

    • Go to next step: If between 2738 - 3350 Ω 
  3. Test for 658 - 806 Ω between the signal terminal A and the ground terminal C with the hood latch in the CLOSED position.
    • If not between 658 - 806 Ω 

      Replace the B55 Hood Ajar Switch.

    • Go to next step: If between 658 - 806 Ω 
  4. Test for 2080 - 2545 Ω between the signal terminal B and the ground terminal C with the hood latch in the CLOSED position.
    • If not between 2080 - 2545 Ω 

      Replace the B55 Hood Ajar Switch.

    • Go to next step: If between 2080 - 2545 Ω 
  5. Test for 2738 - 3350 Ω between the signal terminal A and the signal terminal B with the hood latch in the OPEN position.
    • If not between 2738 - 3350 Ω 

      Replace the B55 Hood Ajar Switch.

    • Go to next step: If between 2738 - 3350 Ω 
  6. Test for 2080 - 2545 Ω between the signal terminal A and the ground terminal C with the hood latch in the OPEN position.
    • If not between 2080 - 2545 Ω 

      Replace the B55 Hood Ajar Switch.

    • Go to next step: If between 2080 - 2545 Ω 
  7. Test for 658 - 806 Ω between the signal terminal B and the ground terminal C with the hood latch in the OPEN position.
    • If not between 658 - 806 Ω 

      Replace the B55 Hood Ajar Switch.

    • Go to next step: If between 658 - 806 Ω 
  8. All OK.
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