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 |
|---|---|---|---|---|
| Low Beam Hedalamp Control | 1 | 1 | 3 | - |
| High Beam Hedalamp Control | 2 | 2 | 4 | - |
| Low Beam Relay Control | 3 | 1 | B2575 | - |
| High Beam Relay Control | 5 | 2 | B2580 | - |
| Headlamp On Switch Signal | B257A | 6 | - | - |
| High/Low Beam Select Switch Signal | 5 | 2 | - | - |
| Low Beam Headlamp Ground | - | 2 | - | - |
| High Beam Headlamp Ground | - | 2 | - | - |
| 1. Low beam headlamps inoperative 2. High beam headlamps inoperative 3. Low beam headlamps always on 4. High beam headlamps always on 5. High beam headlamps always on with low beams 6. Manual headlamps inoperative |
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