Bericht
door ehombie » 12 nov 2021, 18:11
Denk dat je naar de betere (diagnose) specialist moet gaan die diverse aspecten kan controleren cq verifiëren met de betere tools
hierbij wat info over de CAS als je geïnteresseerd bent (sorry voor de platte tekst)
Car Access System
The Car Access System (CAS) controls access into the vehicle (central locking system) and access to vehicle functions (e.g. key identification, electronic immobiliser, engine start release).
The CAS control unit is the master control unit. It is therefore the CAS control unit that issues the release.
The Car Access System of the 4th generation is available in the following versions:
CAS comfort access system (CA: Comfort Access)
CAS with comfort access system
CAS without comfort access system but including electric steering lock (ELV)
CAS with comfort access system and including electric steering lock (ELV)
Functional description
The Car Access System (CAS) combines a wide array of functions. The Car Access System therefore generates a variety of signals and makes these available to other bus users in the vehicle electrical system.
Amongst others, the following functions are included in the Car Access System (CAS):
Terminal control
Comfort start
Remote control of the central-locking system
Central control of the central locking system
Central control of the power windows
Centralised control for CA ( Comfort Access)
Wake-up of the MOST via the K-CAN2 for a telematics service
Central data source for the vehicle order and redundant data storage for vehicle data
Central control of the electric steering lock (if fitted)
The CAS control unit is the master control unit for the terminal control system. The CAS control unit activates the wake-up line (terminal 15 wake-up line), terminal 15, terminal 15N, terminal 30B and terminal 50L.
The CAS control unit is the master control unit for the power windows and central locking system functions. The CAS control unit checks the preconditions for the release before the junction box electronics (JBE) are allowed to activate the central locking system, or the footwell module (FRM) and the junction box electronics are allowed to activate the power window regulators.
The Car Access System evaluates the brake light switch and clutch switch signals for engine start release. Engine start is initialised by pressing the start/stop button. In the process, the CAS control unit checks the following prerequisites:
With automatic transmission, selector lever position "P" or "N" and brake control
With manual gearbox, clutch control
If all prerequisites are met, the engine is started by the CAS control unit. The engine is stopped by pressing the start/stop button once again. On vehicles with automatic transmissions, the engine can only be stopped with the vehicle at a standstill when the parking lock is engaged.
The CAS control unit is the master control unit for the electric steering lock. The electric steering lock is connected to the CAS control unit via the body bus. The electric steering lock is supplied with voltage and activated via the CAS control unit. The electric steering lock is not supplied with current and terminal 15 then not switched until a valid ID transmitter has been successfully authenticated by the CAS control unit. When the electric steering lock has been unlocked and secured, the engine can be started by pressing the start/stop button.
The CAS control unit checks the status information sent from the electric steering lock. If the status information shows a fault, the CAS control unit refuses start authorisation and therefore provides no release for terminal 15.
The CAS control unit is the interface with the START-STOP button and ring aerial. The ring aerial on the steering column transmits the key data. The ring aerial is used for communication between transponder chip (in the ID transmitter) and CAS control unit. In unfavourable situations (e.g. ID transmitter fault, malfunction of radio transmission to the ID transmitter), the ID transmitter may not be found via the interior aerials in the passenger compartment. Communication via the ring aerial makes it possible for the CAS control unit to identify a valid ID transmitter and to issue start enable.
Depending on the vehicle equipment fitted, the control unit function for the comfort access system is integrated in the CAS control unit. Outside door handle electronics are incorporated in each one of the outer door handles. Changes in door handle status are recorded by the sensors in the external door handle electronics and transmitted to the CAS control unit. The ID transmitter is requested via an aerial signal from the CAS control unit to identify itself. The aerial signal is emitted by the CAS control unit via the exterior aerials.
Various aerials are required for communication with the ID transmitter: Interior and exterior aerials for the comfort access system and the aerial for the remote control service. All aerials are connected to the CAS control unit. Further data processing as well as the corresponding function execution take place in the CAS control unit.
The CAS control unit evaluates the status of the engine compartment lid contact switch for the automatic start/stop function (MSA) and for the anti-theft alarm system (DWA).
HANDIG in onderhoud, kleine reparaties, coderingen en evt diagnose.
Alles gaat gepaard met tijd, kennis en beschikbare informatie en/of middelen...een glazenbol heb ik niet
E61 523i LCI verkocht
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