Ignition/Starter Switch (ZAS)

The ignition/starter switch is the electro-mechanical part of the CAS and consists of:

• An ignition switch with an electromagnetic lock.
• A start/stop button.
• A coil for powering and communicating with the EWS transponder and for charging the battery in the remote controls.
  Fig 1: Identifying Ignition/Starter Switch (ZAS)

  Courtesy of BMW OF NORTH AMERICA, INC.

The ignition lock/start button (ZAS) is located in the instrument panel between the instrument cluster and the control display at the level of the trim strips.

Light emitting diodes (LEDs) are integrated into the ignition/start button for illumination.

The LEDs:

• Illuminate the start/stop button and the ignition lock/remote control receiver.
• Are switched on by the CAS from the "wake-up" signal.
• The LEDs are switched on as long as the bus is active (Useful for diagnosis of the bus sleep mode: when the LEDs light up, the bus is active).

Using the ignition/starter switch (ZAS) and the remote controls:

• The vehicle is started.
• The different terminal statuses are selected (KL30, KL R, KL 15, KL 50).