Remove the front individual map lights.

Disconnect the sunshade switch 10P connector (A), map light switch 3P connector (B), and HFT microphone 3P connector (C) (if equipped).

Remove the sunshade switch (D).

Check for continuity between the terminals in each switch position according to the table.

If the continuity is not as specified, replace the illumination bulb or the switch.

Install the switch and light in the reverse order of removal.