Mitsubishi LANCER Owner's Manual page 665

Vehicle care and maintenance
2. While holding down the tab (A), pull out the bulb.
3. To install the bulb, perform the removal steps in reverse.
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7-88
NOTE
Before replacing the bulb, put the dome light (rear) switch
into the "OFF" position.
When mounting the lens, align the tab (B) with the hole
on the vehicle body.