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 > Power Mirror Control System(w/ Memory): Data List / Active Test
DATA LIST / ACTIVE TEST 1. READ DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals ma ...