Replace the battery with a new one if it is depleted.
You will need the following items:
Replacing the battery 1. Remove the cover. To prevent damage to the key, cover the tip of the screwdriver with a rag. To prevent the buttons from being disassembled, face the button surface downward. 2. Remove the module. 3. Open the case cover using a coin protected with tape, etc., and remove the depleted battery. Insert a new battery with the "+" terminal facing up. ■Use a CR2016 lithium battery
■If the key battery is depleted The following symptoms may occur:
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Toyota Tundra Service Manual > Windshield Deicer System: System Description
SYSTEM DESCRIPTION 1. GENERAL The windshield deicer system's thin heater wires are attached to the inside of the windshield glass and deice the windshield surface quickly. The indicator light illuminates while the system is operating. The system automatically turns off after approximately 15 min ...