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 > Audio And Visual System: Microphone Circuit between Microphone and Radio Receiver
DESCRIPTION This circuit sends a microphone signal from the telephone microphone assembly to the radio and display receiver assembly. It also supplies power from the radio and display receiver assembly to the telephone microphone assembly. WIRING DIAGRAM PROCEDURE 1. CHECK HARNESS AND CONNECTOR (RAD ...