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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 981 (Lighting Systems) >> Diagnostic Information and Procedures >> DTC B257A >> Diagnostic Fault Information

Diagnostic Fault Information

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.
Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Headlamp Switch Off B257A 00 2 and 4 4 -
Park Lamp Switch On B257A 00 B257A 00 3 -
Headlamp Switch On B257A 00 1 1 -
Headlamp Switch Ground - 1,3, and 4 - -
  1. Headlamps Inoperative Low and High Beams
  2. Headlamps Always On Low or High Beam
  3. Park, License, and Tail Lamps Inoperative
  4. Daytime Running Lamps (DRL) Defeat Inoperative
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