Circuit/System Verification
WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition ON, with a scan tool command the Low Beams ON and OFF. The low beam headlamps should turn ON and OFF when changing between the commanded states.
- If the low beam headlamps do not turn ON and OFF when commanded, refer to Headlamps Malfunction .
- Ignition ON, park brake released, verify with a scan tool the Park Brake Switch parameter displays Released.
- If not the specified value, refer to Brake Warning Indicator Malfunction .
- Ignition ON, with a scan tool command the DRL ON and OFF. The low beam headlamps should turn ON and OFF when changing between the commanded states.
- If the low beam headlamps do not turn ON and OFF when commanded, refer to Daytime Running Lamps Malfunction .
- If the low beam headlamps turn ON and OFF when commanded, refer to Ambient Light Sensor Malfunction .