Power Mirror Switch Illumination Circuit
WARNING: This page is about a different car, the 2002 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
Turn ignition off and disconnect Black 10-pin power mirror switch electrical harness connector and remove power mirror switch. Using jumper wires, connect battery positive voltage to terminal No. 5 and battery negative voltage to terminal No. 6. See Figure. If illumination lights do not light up, replace power mirror switch.