2009 Toyota Avalon Owners Manual - Page 379
2009 Toyota Avalon Manual
Page 379 highlights
4-3. Do-it-yourself maintenance STEP 3 Remove the depleted battery. Insert a new battery with the "+" terminal facing up. n Replacing the battery (vehicles without smart key system) STEP 1 Remove the cover. 4 Maintenance and care STEP 2 Remove the module. 355