MOST LIKELY...
when a dashboard back light is out it's usually caused by one or more burned out bulbs.
Front or back?
lancer
Based on numerous internet searches the code means you check engine light is on.
It means there is a problem with the SRS (Supplemental Restraint System) or Air Bags. This is a repair for a professional.
To reset the service light on a 2002 Mitsubishi Lancer, turn the ignition key to the "ON" position without starting the engine. Press the gas pedal three times within 10 seconds. Turn the ignition off, then turn it back to the "ON" position to confirm that the service light has reset. If the light remains on, repeat the process.
In a 2004 Mitsubishi Lancer replacing the rear light bulb is relatively easy. First remove the plastic cover from the dome light. Unscrew the light bulb and insert the replacement.
You have light bulb that is burned out at the back of the vehicle.
Retract means to take something back, or to disavow it. It also means to draw back. So logically to retract light would mean to draw back the light source, as you cannot physically draw back or tack back light itself once it has been released.
Have the problem that triggered the light repaired by a professional. He will reset the light. Not a DIY repair.
See sources and related links below for the 2002 Mitsubishi Lancer headlight bulb info.
Grand Touring Sport
You will need special brake caliper tool such as a C-clamp to push back the piston on the caliper of a 2002 Mitsubishi Lancer.