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 > Air Pump: On-vehicle Inspection
ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT AIR PUMP ASSEMBLY (a) Start the engine and warm it up. (b) Turn the ignition switch off. (c) Connect the 400 A probe of an ammeter to the (+) wire of the air pump assembly. (d) Connect the Techstream to the DLC3. (e) Turn the ignition switch to ON and turn ...