See also:

Low battery voltage
If the battery voltage is too low, the parking brake cannot be applied or released. Connect an auxiliary battery if the battery voltage is too low, see page 114. ...

Precautions when the vehicle is being towed
Attach jumper cables (see page 116) to provide current for releasing the electric parking brake and to move the gear selector from the P position to N. Be sure that the steering wheel lock ...

When does BLIS function
The system functions when your vehicle is moving at speeds above 6 mph (10 km/h). When you pass another vehicle: The system reacts when you pass another vehicle at a speed of up to 6 mph (10 km/h) ...