Toyota Yaris: Owner Maintenance / Key Battery Replacement

Toyota Yaris XP210 (2020-2025) Owner's Manual / Maintenance and Care / Owner Maintenance / Key Battery Replacement

If the buttons on the smart key are inoperable and the operation indicator light does not flash, the battery may be dead. Replace with a new battery before the smart key becomes unusable.

The following conditions indicate that the battery power is low:

The KEY indicator light (green) flashes in the combination meter for about 30 seconds after the engine is switched OFF.
The system does not operate and the operation indicator light on the smart key does not flash when the buttons are pressed.
The system’s operational range is reduced.

Replacing the battery at your Toyota dealer is recommended to prevent damage to the key. If replacing the battery by yourself, follow the instruction below.

Replacing the key battery

Press the knob and pull out the auxiliary key.
Twist a tape-wrapped flathead screwdriver in the direction of the arrow and open the cover slightly.
Insert the tape-wrapped flathead screwdriver into the gap and slide it in the direction of the arrow.
Twist the flathead screwdriver in the direction of the arrow and remove the cover.
Remove the battery cap, then remove the battery.
Insert a new battery with the positive pole facing up, and then cover the battery with the battery cap.
Close the cover.
Reinsert the auxiliary key.

NOTICE

Make sure the battery is installed correctly. Battery leakage could occur if it is not installed correctly.
When replacing the battery, be careful not to touch any of the internal circuitry and electrical terminals, bend the electrical terminals, or get dirt in the smart key as the smart key could be damaged.
There is the danger of explosion if the battery is not correctly replaced.
Dispose of used batteries according to the following instructions.
- Insulate the plus and minus terminals of the battery using cellophane or equivalent tape.
- Never disassemble.
- Never throw the battery into fire or water.
- Never deform or crush.
Replace only with the same type battery (CR2025 or equivalent).
Be careful not to allow the rubber ring shown in the figure to be scratched or damaged.
If the rubber ring detaches, reattach it before inserting a new battery.

Battery

Before performing battery maintenance, remove the battery cover by pressing the tab. WARNING Wash hands after handling the battery and related accessories Battery posts, terminals and related accessories contain lead and lead compounds, chemicals known to the State of California to cause cancer and reproductive harm...

Tires

For reasons of proper performance, safety, and better fuel economy, always maintain recommended tire inflation pressures and stay within the recommended load limits and weight distribution...

Other information:

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual: Problem Symptoms Table

PROBLEM SYMPTOMS TABLE Stop and Start System Symptom Suspected Area Link Stop and start system does not operate Refer to "Stop and Start System does not Operate" Refer to "Stop and Start System does not Operate (Battery Condition)" Restarting after a short period of time from an idling stop Refer to "Restarting after a Short Period of Time from an Idling Stop" After engine stops due to stop and start system, engine does not restart Refer to "After Engine Stops due to Stop and Start System, Engine does not Restart" Failure to restart from IG-ON engine stall Refer to "Failure to Restart from IG-ON Engine Stall" Stop and start cancel indicator does not operate Combination meter assembly Indicator circuit (CAN communication system) Engine stop and start ECU Stop and start indicator does not operate Combination meter assembly Indicator circuit (CAN communication system) Engine stop and start ECU Stop and start control cannot be canceled ECAN terminal voltage Stop and start cancel switch circuit Multi-information display screen does not change after pressing steering pad switch assembly...

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual: Glossary Of Sae And Toyota Terms

GLOSSARY OF SAE AND TOYOTA TERMS This glossary lists all SAE-J1930 terms and abbreviations used in this manual in compliance with SAE recommendations, as well as their TOYOTA equivalents. SAE Abbreviation SAE Term TOYOTA Term ( )-Abbreviation A/C Air Conditioning Air Conditioner ACL Air Cleaner Air Cleaner, A/CL AIR Secondary Air Injection Air Injection (AI) AP Accelerator Pedal - B+ Battery Positive Voltage +B, Battery Voltage BARO Barometric Pressure HAC CAC Charge Air Cooler Intercooler CARB Carburetor Carburetor CFI Continuous Fuel Injection - CKP Crankshaft Position Crank Angle CL Closed Loop Closed Loop CMP Camshaft Position Cam Angle CPP Clutch Pedal Position - CTOX Continuous Trap Oxidizer - CTP Closed Throttle Position LL ON, Idle ON DFI Direct Fuel Injection Direct Injection (DI...