Steering assistance is part of Pilot Assist and can only be used when Pilot Assist is active.
If steering assistance is unavailable for some reason, such as due to deteriorated lane markings, you won't be able to activate it. However, by enabling steering assistance, it will automatically activate when the required conditions are met.
Press the steering assistance button on the steering wheel.
Steering assistance is either enabled or disabled.
If enabled, steering assistance activates automatically when the required conditions are met.
If disabled, Pilot Assist will remain active but mainly provide speed- and distance-keeping support.