TOYOTA 2011 Matrix - Manual (Page 389)

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4-3. Do-it-yourself maintenance
Key battery (vehicles with wireless remote control)
Replace the battery with a new one if it is discharged.
■ You will need the following items:
● Flathead screwdriver (To prevent damage to the key, cover
the tip of the screwdriver with a rag.)
● Lithium battery CR2025
■ Replacing the battery
Remove the cover.
Remove the module.
STEP 1
STEP 2