Toyota bZ4X Owner's Manual: Power (Ignition) Switch and EV System Operation

This section explains how the power switch functions and how the electric vehicle system responds under different conditions. When you carry the electronic key, certain operations are triggered to start the EV system or change its mode, while the illumination of the power switch provides visual feedback about the vehicle’s status.

Power Switch Illumination

The operation of the power switch illumination varies depending on the situation:

• When the driver's door or the front passenger’s door is opened, the power switch lights up.
• If the power switch is off and you depress the brake pedal while carrying the electronic key, the illumination blinks.
• When the power switch is in accessory (ACC) or on mode, the illumination remains steady.
• When changing the mode from ACC or on to off, the light stays illuminated for a short period before turning off.

If the EV System Does Not Start

If you encounter problems starting the EV system, consider the following possibilities:

• The immobilizer system may not have been deactivated; in such cases, contact your authorized service center.
• The charging cable might still be connected to the vehicle.
• If a start-up related message appears on the multi-information display, read the instructions provided and follow them carefully.
• If the door is unlocked using the mechanical key, the smart key system will not work. However, when the electronic key is inside the vehicle and the doors are locked, the EV system can start normally.

Cold Weather and Starting Conditions

When ambient temperatures are low, such as during winter, the following conditions may affect system start-up:

• On starting the EV system, the "READY" indicator may flash for a longer period. Wait until the indicator becomes steady, as this signals that the vehicle is ready for motion.
• If the traction battery is extremely cold (below approximately –22°F [–30°C]), it might be difficult to start the EV system. In this situation, allow some time for the battery to warm up naturally before trying again.

Battery and Electronic Key Considerations

If the 12-volt battery is discharged, the EV system cannot be started using the smart key system; refer to the restart procedure. Similarly, if the electronic key’s battery is depleted, you may experience difficulties activating the EV system. Conditions affecting these components can lead to inconsistent performance, so it is important to monitor their status regularly.

Operation of the Power Switch

For proper EV system operation, ensure that:

• You press the power switch in a short and firm manner; otherwise, the mode might not change or the EV system may not start.
• If you attempt to restart the EV system immediately after turning it off, sometimes you may need to wait a few seconds before the system is ready to start again.

Safety Warnings When Starting the EV System

Please note the following important safety precautions:

• Always start the EV system while seated in the driver's seat. Do not press the accelerator pedal while starting the system under any circumstances, as this could lead to an accident resulting in serious injury or death.

If the EV system becomes difficult to start or if a message such as "Smart Key System Malfunction – See Owner’s Manual" appears on the multi-information display, the system may be malfunctioning. In such cases, it is essential to have the vehicle inspected immediately by your authorized service center.

Stopping the EV System

1. Bring the vehicle to a complete stop.
2. Engage the parking brake.
3. Select the "P" (park) position and check that the shift indicator confirms it is in park and that the parking brake light is on.
4. Press the power switch to turn off the EV system. After doing so, the meter display will turn off, and the shift position indicator will extinguish a few seconds later.
5. Finally, release the brake pedal and ensure that neither "ACCESSORY" nor "POWER ON" appears on the meter.

Automatic EV System Shut Off Feature

The vehicle is equipped with an automatic shut-off feature that turns off the EV system when the shift position is in park for an extended period. Specifically:

• If the EV system is left operating in park, it will automatically shut off after approximately one hour.
• The timer resets if the brake pedal is pressed or if the shift lever is moved out of park.
• If you lock the vehicle using either the door lock switch from inside or the mechanical key from outside after parking, the automatic shut-off feature will be disabled. It will reactivate once the driver's door is opened.

Shift Control System Malfunctions

If you encounter a malfunction in the shift control system-for example, if turning off the power switch causes the mode to switch to accessory (ACC) unexpectedly-apply the parking brake and press the power switch again to turn off the system. Should any malfunction persist, contact your authorized service center immediately.

Emergency Shutdown and Automatic P Position Selection

In emergencies when you need to stop the EV system while driving, you can:

• Press and hold the power switch for more than two seconds, or press it briefly three or more times in succession. This action will stop the EV system quickly.

However, do not operate the power switch while driving except in emergencies. Although turning off the EV system while driving will not cause an immediate loss of steering or braking control, it may disable power assistance, making it harder to steer smoothly. If this occurs, pull over and stop as soon as it is safe to do so.

• If the power switch is activated while the vehicle is running, a warning message will appear on the multi-information display and a buzzer will sound.
• When restarting the EV system after an emergency shutdown, press the power switch quickly and firmly.

Maintaining proper operation of the EV system is crucial for both performance and safety. By following these detailed guidelines, you ensure that the system performs reliably under various conditions-from extreme cold to emergency situations. This attention to detail not only enhances your overall driving experience but also contributes to energy efficiency and system longevity. For instance, one advanced electric vehicle from Toyota exemplifies how innovative technology, coupled with strict adherence to operating procedures, creates a smooth and responsive ride.

Changing power switch modes

Modes can be changed by pressing the power switch with the brake pedal released. (The mode changes each time the switch is pressed.)

1. "ACCESSORY"
2. "POWER ON"

1. OFF

The emergency flashers can be used.

2. ACC*

Some electrical components such as the audio system can be used.

"ACCESSORY" will be displayed on the multi-information display.

3. ON

All electrical components can be used.

"POWER ON" will be displayed on the multi-information display.

*: Setting can be customized