Could be like my 325I. It has a sensor that only lights the keyboard when it
it detects there isn't enough ambiant light on the keys. It also can light
the keys at random if you cover the sensor while handling the phone. If I'm
not istaken you can turn the battery saver off and the keys will stay lit.
Check your owners manual.
Norm





See More: SLVR L7 - Keypad Backlight problem