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 > Vehicle Stability Control System: Open in Stop Light Switch Circuit (C1249)
DESCRIPTION The skid control ECU (brake actuator assembly) receives stop light switch signals and uses them to determine whether or not the brakes are applied. DTC No. Detection Item DTC Detection Condition Trouble Area C1249 Open in Stop Light Switch Circuit Vehicle driven at 20 km/h (12 mph) or mo ...