Remote control/electronic key battery
If the battery is discharged, replace it with a new one.
You will need the following items:
- Flat-blade screwdriver
- Small flat-blade screwdriver
- CR2016 lithium battery (vehicles without smart entry and start system), or CR2032 (vehicles with smart entry and start system)
Battery replacement
Vehicles without smart entry and start system
1. Lift up the cover.
Insert the flat-blade screwdriver into the slot and push down.
To avoid damaging the key, wrap the tip of the flat-blade screwdriver with a cloth.

2. Remove the cover.
Insert the flat-blade screwdriver into the bottom of the key and push down.

3. Remove the depleted battery.
Insert a new battery with the "+" terminal facing up.

Vehicles with smart entry & start system
1. Remove the cover.
To avoid damaging the key, wrap the tip of the flat-blade screwdriver with a piece of tape.

2. Remove the battery cover.
Pull the battery cover knob to remove it.

3. Remove the depleted battery.
Insert a new battery with the "+" terminal facing up.

■ Use a CR2016 lithium battery (vehicles without smart entry and start system) or CR2032 (vehicles with smart entry and start system)
- Batteries can be purchased at any Toyota dealer or repair shop, or from another suitably qualified and equipped professional, local electrical appliance retailers or camera shops.
- Replace only with the same or an equivalent type recommended by the manufacturer.
- Dispose of used batteries in accordance with local laws.
■ If the key battery is depleted The following may occur:
- The smart entry and start system (if equipped) and the remote control will not function properly.
- The operating range will be reduced.
WARNING
■ Battery and other removed components These are small parts that may cause choking if swallowed.
Keep out of the reach of children. Failure to do so may result in serious or fatal injury.
■ Electronic key battery certification CAUTION: REPLACING THE BATTERY WITH AN INCORRECT TYPE MAY RESULT IN A RISK OF EXPLOSION. DISPOSE OF USED BATTERIES ACCORDING TO THE INSTRUCTIONS.
NOTE
■ For normal operation after replacing the battery Observe the following precautions to avoid accidents:
- Always keep your hands dry while working.
Moisture may cause the battery to corrode.
Test yourself
A quick Toyota Aygo quiz: every answer comes with an explanation and a link to the manual page.