2011 Toyota Tundra Regular Cab Owners Manual - Page 588

4-3. Do-it-yourself maintenance Wireless remote control battery Replace the battery with a new one if it is discharged. n You will need the following items: Lithium battery CR2032 n Replacing the battery Remove the cover using a coin protected with tape etc. Remove the discharged transmitter battery. 4 Insert a new battery with the "+" terminal facing up. Maintenance and care 563