courtesy lights wont go off

Hi, this is Bo, an auto expert on RepairPal's Car Genius team! If the courtesy lights in your 2000 Chevy Blazer won’t turn off, it’s often due to a faulty door switch. Each door has a switch that signals when the door is open, and if one of these malfunctions, the system can mistakenly think the door is always open. Another possibility is a problem with the dimmer switch or a relay in the circuit. If you need any further advice or want help finding a trusted RepairPal shop in your area, please feel free to call us at 877-913-1554!