You will need a screwdriver.
Before starting work: Disconnect the wire from the terminal "–" battery.
The interior light door switch is screwed to the body pillar.
1. Loosen the screw securing the switch and...
2.... remove the switch from the hole in the body pillar.
3. Disconnect the wire end from the switch.
4. Remove the seal from the switch.
5. Check the condition of the seal and the operation of the switch (refer to checking the parking brake indicator switch, subsection 8.7.1.).