Ignition Switch

Typical positions are off, accessory, on and start. Keyless cars use a start button and electronic control instead of a mechanical switch. The switch works together with the immobiliser. On older cars the ignition switch is a separate electrical part behind the lock cylinder and can be replaced without changing the keys. Some models have had recalls for switches that could move out of position while driving.

Contacts inside the switch connect different circuits as the key is turned or the button is pressed.

A worn switch can cause stalling, flickering dash lights or no-start problems. Heavy key rings can wear the switch over time.