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Home >> Buick >> 2012 >> Regal Turbo, Automatic Trans >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Headlights >> Lighting System >> Diagnostic Information and Procedures >> Headlamps Malfunction >> Diagnostic Fault Information

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Low Beam Headlamp Supply Voltage 1 1 3 -
High Beam Headlamp Supply Voltage 2 2 4 -
Headlamp Ground - 1, 2 - -
Headlamp High Beam Relay Control 4 2 1 -
Headlamp Switch Headlamps OFF Signal B257A 00 6 6* -
Headlamp Switch Headlamps On Signal B257A 00 1 1* -
Headlamp Switch Ground - 3 - -
Flash to Pass Switch Signal 4 5 5 -
High Beam Signal 4 2 2 -
Turn Signal/Multifunction Switch Ground - 2, 5 - -
* Internal damage to the headlamp switch may occur if shorted to B+
1. Low Beam Headlamps Inoperative
2. High Beam Headlamps Inoperative
3. Low Beam Headlamps always ON
4. High Beam Headlamps always ON
5. Flash to Pass Inoperative
6. Headlamp Defeat Inoperative