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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 991 (Door Lock Systems & Door Handles) >> Diagnostic Information and Procedures >> DTC B3140, B3145, B3150, or B3155 >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the door lock switch.
  2. Test for infinite resistance between the signal terminal listed below and the ground terminal B with the switch in the open position.
    • Lock terminal D
    • Unlock terminal E
    • If not the specified value, replace the door lock switch.
  3. Test for less than 1 ohm between the signal terminal listed below and the ground terminal B with the switch in the closed position.
    • Lock terminal D
    • Unlock terminal E
    • If greater than the specified range, replace the door lock switch.
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