Step 2 - Inspect Room Light Switch

WARNING: This page is about a different car, the 2002 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the connector from the interior light assembly.
Turn the interior light switch ON, check that continuity exists terminal 2 and body ground.

Fig 1: Testing Room Light Switch (1 Of 2)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Turn the interior light switch to DOOR, check that continuity exists between terminals 1 and 2.

Fig 2: Testing Room Light Switch (2 Of 2)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

If operation is not as specified, replace the switch.