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 Owners Manual > Using the air conditioning
system: Seat heaters/
seat ventilators
The seat heaters and ventilators heat the seats and maintain good airflow by blowing air from the seats. Seat heaters Turns the seat heater on Hi Mid Lo Off The level indicator lights come on. Press the "" on the button to up and "" to down, and off. Seat ventilators ■ Seat heater Turns the seat ...