CAS Control Unit

The CAS control unit is the electronic part of the CAS/ZAS. The CAS is connected via the K-CAN Periphery with:

• The door modules
• The seat modules
• The Power Module

The higher-level connection to the entire vehicle is carried out via the K-CAN System.

All outputs from the CAS are designed

• With semiconductor technology
• Are short-circuit-proof to ground and B+
• Are fully diagnosis-capable
  Fig 1: Identifying CAS Control Unit

  Courtesy of BMW OF NORTH AMERICA, INC.

The CAS is the Gateway between the K-CAN System and K-CAN Periphery Bus.

Fig 2: Identifying K-CAN System And K-CAN Periphery Bus

Courtesy of BMW OF NORTH AMERICA, INC.

The CAS directly controls the functions:

• Radio remote control (FBD)
• Terminal control
• Electronic immobilizer (EWS)
• Starter-motor control
• Engine starting (ignition/starter switch)

The CAS control unit has the master functions for:

• The central locking system
• The window functions

The CAS has data storage functions:

• The mileage reading is stored in the instrument cluster (KOMBI) and in the CAS. When one of the two control units is replaced, the kilometer reading of the vehicle is transferred from the other control unit to the new control unit.
• Vehicle Order (successor to ZCS) is stored in the Lamp Module (LM) and the CAS.