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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 859 (Lighting Systems) >> Diagnostic Information and Procedures >> DTC B257A >> Diagnostic Fault Information

Diagnostic Fault Information

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
DTC B257A

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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