The exterior lights are controlled with a left-side headlight switch, while interior lighting is managed by a dash dimmer and overhead controls. If your Blazer has fog lights, there is a separate switch for them. Controls can vary by year and trim, so check your owner’s manual if you’re unsure.
In most Chevy Blazer models, you operate the exterior lighting with a rotary switch on the left side of the steering column. The switch typically offers Off, Auto, Parking Lights, and Headlights positions. Interior cabin lighting is adjusted with a dimmer control near the headlight switch, and many trims include overhead map lights. If your vehicle is equipped with fog lights, a dedicated switch or stalk control will activate them.
Headlight controls and layout
Where to locate and what the common symbols indicate helps you operate the lights quickly, especially in unfamiliar driving conditions.
Turning on exterior headlights
Follow these steps to power the exterior lights manually or enable automatic operation.
- Start the engine or turn the ignition to ON/ACC as required by your year and trim. Some Blazer models enable auto headlights only when the engine is running.
- Rotate the headlight control knob on the left side of the steering column to AUTO for automatic operation, or to the headlight symbol for manual on.
- If you want only the parking lights, set the switch to the Parking Lights position.
- For fog lights (if your Blazer is equipped), activate them with the dedicated fog-light switch on the headlight panel or end of the stalk, depending on trim.
In automatic mode, the system will turn exterior lights on and off based on ambient light conditions. Manual mode gives you direct control regardless of light conditions. If you don’t see any lights, double-check the switch position and ignition status, then consult the owner’s manual for your specific year and trim.
Interior and dashboard lighting
Cabin brightness and overhead map lights help you see controls and maps without glare. Here’s how to manage them.
- Use the dash/ instrument- cluster dimmer near the headlight switch. Turn the dial clockwise to brighten the gauges and displays, or counterclockwise to dim them.
- Overhead map lights are typically controlled by push-button switches in the overhead console; press to turn on or off as needed.
- Door courtesy lights generally illuminate when a door is opened and dim or switch off automatically based on the vehicle’s settings; consult your manual for any trim-specific options.
Adjusting interior lighting helps you tailor night driving comfort and readability of gauges. If the dash remains too bright or too dim after adjusting the dimmer, try cycling the ignition or checking for any dimming presets in the vehicle’s settings.
Fog lights and other auxiliary lighting
Fog lights improve visibility in fog, rain, or snow. If your Blazer supports them, use the dedicated switch to activate them after turning the exterior lights on.
- Turn the exterior lights to AUTO or ON.
- Activate the fog lights with the fog-light control on the headlight panel or stalk, depending on trim.
- Only use fog lights when conditions warrant them; they are not a substitute for headlights in normal conditions and can drain the battery if left on unnecessarily.
Fog lights should be used when visibility is reduced but should be turned off when not needed to conserve energy and avoid glare for other drivers.
Troubleshooting common issues
If the lights don’t operate as expected, try these quick checks before visiting a dealer or service shop.
What to check if exterior lights won’t turn on
Ensure the headlight switch is in the correct position (AUTO or ON), verify ignition status as required by your model, and inspect relevant fuses. If lights still don’t come on, there may be a blown bulb or a larger electrical issue; consult the owner’s manual or a Chevy service center for diagnostics.
What to check if interior lights or dash brightness won’t adjust
Confirm the dimmer control is turned, inspect any vehicle settings related to display brightness, and check for blown interior bulbs or faulty wiring if applicable. Some models also offer software-based display brightness controls in the infotainment or vehicle settings menu.
Summary
Turning on the Chevy Blazer’s lights centers on the left-side headlight control for exterior lighting, and a dash dimmer plus overhead switches for interior lighting. Fog lights, if equipped, use a separate control. Controls can vary by year and trim, so consult your owner’s manual for exact locations and symbols. With these basics, you’ll be prepared to navigate night driving and changing weather conditions safely.