TOYOTA 2011 Camry HV - Manual (Page 388)

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4-3. Do-it-yourself maintenance
Key battery
Replace the battery with a new one if it is discharged.
n You will need the following items:
l Flathead screwdriver (To prevent damage to the key, cover
the tip of the screwdriver with rag.)
l Small Phillips-head screwdriver
l Lithium battery CR1632
n Replacing the battery
Take out the mechanical key.
Remove the cover.
STEP 1
STEP 2