The new MINI (R56) is equipped with a Car Access System (CAS). The CAS is derived from the BMW 1 Series and 3 Series. The MINI also assumes a leading position in its vehicle class in the area of comfort (UKL1+).
The Car Access System (CAS) regulates the access options to the vehicle. The CAS control module is the master control module, e.g. for the following systems.
This means the MINI now also has a mount for the remote control and a START-STOP unit with START-STOP button.
The electronic immobilizer is an enhancement (4th generation).
The following components for the Car Access System are described:
The CAS control module is the master control module for the above-mentioned systems. The CAS control module is the interface to the START-STOP unit with a fixture for the remote control. The electrical steering interlock is also activated by the CAS control module. The CAS control module is connected directly to the K-CAN (body CAN). The electrical steering interlock is connected to the CAS via the K bus.
Index |
Explanation |
Index |
Explanation |
|---|---|---|---|
1 |
Central-locking drive, driver's door |
2 |
Central-locking drive, door on the passenger's side |
3 |
Junction box electronics (JBE) |
4 |
Central locking drive, rear lid |
5 |
Button in the outer door handle, passenger's side |
6 |
Control module for Comfort Access |
7 |
Remote control receiver in the inside mirror |
8 |
Footwell module (FRM) |
9 |
Electric steering interlock |
10 |
Outer door handle on driver's side with button |
11 |
START-STOP unit with START-STOP button as well as fixture for remote control |
12 |
Car Access System (CAS) |
The electronic immobilizer of the 4th generation is integrated in the Car Access System.
The START-STOP unit is connected via a 14-pin plug-in connection to the CAS control module. The START-STOP button is integrated in the START-STOP unit together with the fixture for the remote control.
Together with the remote control, the START-STOP button is used to start the vehicle. The remote control contains an authorization code for each vehicle.
Index |
Explanation |
Index |
Explanation |
|---|---|---|---|
1 |
Mounting |
2 |
START-STOP button |
3 |
Remote control |
|
|
After inserting the remote control in the mounting, the authorization of the transponder is read out. When the CAS detects an authorized remote control, terminal R is switched on. At the same time, the remote control is locked in the fixture. The withdrawal lock is locked by a solenoid switch. The locked remote control is a precondition for switching the terminals (terminal R, terminal 15 with engine on/off).
A withdrawal lock prevents the remote control from being pulled out under the following conditions:
Pressing the START-STOP button initializes the engine start. Here, the CAS control module checks the following requirements:
When all the requirements have been met, the engine is started by the CAS control module (activation of terminal 50). To stop the engine, press the START-STOP button once again. The engine is stopped; terminal R remains switched on (long press, terminal 30). On vehicles with automatic transmissions, the engine can only be stopped with the vehicle at a standstill when the parking lock is engaged. This fully electronic access to the vehicle has the following advantages:
Note! Emergency function while the vehicle is being driven.
For safety reasons, the engine can be stopped while the vehicle is being driven by pressing the START-STOP button. A renewed start in this case is possible without additional brake operation or clutch operation.
Note! Engine start with Comfort Access.
With Comfort Access, the remote control does not have to be in the mounting at engine start-up.
After authentication by the CAS, the electrical steering interlock is supplied with current. Only now can the steering be unlocked or locked. An engine start is only permitted when the electrical steering interlock has been unlocked and secured.
Index |
Explanation |
Index |
Explanation |
|---|---|---|---|
1 |
Steering column |
2 |
4-pin plug-in connection |
3 |
Electric steering interlock |
|
|
The electrical steering interlock can only be locked when the vehicle is at a standstill and the engine has stopped. If no unlocking procedure or locking procedure is carried out, the electrical steering interlock is secured and without current.
The following system functions are described for the Car Access System (CAS):
The CAS activates the following terminals via the START-STOP unit as follows:
The electronic immobilizer is both an anti-theft device and start release. On the MINI, a newly developed electronic immobilizer (4th generation) is introduced. This development uses a new and modern encryption method. Each vehicle is assigned a 128-bit secret code. This secret code is stored in a BMW database. This means that the secret code is only known to BMW. The secret code is programmed and locked in the CAS control module and the DME control module. When the secret code is in the control modules, it can no longer be deleted or changed. This means that each control module is assigned to a certain vehicle. The CAS control module and the EWS control module mutually identify themselves with the secret number and the same algorithm. If the identification data is correct, the CAS control module activates the starter motor via a relay in the control module. At the same time, the CAS control module sends the DME control module a coded release signal (changing code) for the engine start. The DME control module only enables the engine start if a correct enable signal is received from the CAS control module. These procedures may result in a slight start delay (up to half a second).
Note! Procedure in the event of a defective control module!
If the CAS or DME is defective, a certain procedure must be followed. The required control module must be ordered exactly for the vehicle. For this, the vehicle data (vehicle identification number) is required. An EWS calibration is not necessary after renewing the control module.
Pressing the START-STOP button initiates the starting operation. The starter motor is only activated until the engine is running. If the engine does not start, the starting operation is aborted after approx. 60 seconds. The START-STOP button only picks up driver's requests. The starting operation is carried out by the CAS control module. The CAS only performs the engine start when all the start conditions have been met. If a condition is no longer met during the starting operation, the starting operation is aborted.
During the unlocking procedure, an authentication procedure is run between the Car Access System (CAS) and the electrical steering interlock. The electrical steering interlock may only commence unlocking after a positive result in the authentication procedure. For safety reasons, the electrical steering interlock is not supplied with current while the vehicle is being driven. The electrical steering interlock is only supplied with voltage for the unlocking procedure or locking procedure.
Unlocking the electrical steering interlock
Switching on terminal R starts the unlocking procedure. After recognition of valid access rights, the CAS triggers the operation for unlocking the electrical steering interlock. First, the CAS switches the electrical steering interlock on. Then, the vehicle status and status of the electrical steering interlock are checked. Subsequently, a coded release for unlocking is sent. After receipt of the valid release, the electrical steering interlock initiates the unlocking procedure. The drive of the electrical steering interlock is activated towards ”unlock”.
Index |
Explanation |
Index |
Explanation |
|---|---|---|---|
1 |
Steering column tube |
2 |
Housing cover |
3 |
Drive with gearing and lock |
|
|
The motor moves a driver via a single-stage gear. The driver pulls the locking bolt into the unlocked position until the securing lever locks into place. The end position of the securing lever is picked up by a Hall sensor. If the electrical steering interlock detects the position ”unlocked and secured”, the engine is stopped. This status is sent via K-CAN to the CAS. The CAS interrupts the power supply. When no current is applied, the securing lever is automatically locked.
Note! Start release by the Car Access System.
Start release is granted by the CAS control module. A start release is only granted after an fault-free plausibility check. The CAS control module must detect the status ”unlocked and secured” without faults. For an engine start, the CAS must have switched off the power supply to the electrical steering interlock.
Note! Unlocking with Comfort Access
On vehicles with Comfort Access, the remote control is also an identification sensor. To unlock the electrical steering interlock, a valid identification sensor must be detected in the inside of the vehicle.
Locking the electrical steering interlock
When all the conditions for locking have been met, the CAS initiates the locking procedure. The CAS switches the power supply for the electrical steering interlock on and checks its status. After a successful plausibility check of the status, the CAS sends the locking release to the electrical steering interlock. The locking procedure starts. The motor moves a driver via a single-stage gear. The driver pulls the locking bolt into the locked position until the securing lever locks into place. The end position of the securing lever is picked up by a Hall sensor. If the electrical steering interlock detects the position ”not unlocked and secured”, the engine is stopped. This status is sent via K-bus to the CAS. The CAS interrupts the power supply. When no current is applied, the securing lever is automatically locked. If the electrical steering interlock has already locked without faults, no locking procedure is executed. The electrical steering interlock once again sends the current status to the CAS control module.
Note! Interlock only after the vehicle is at a standstill.
The electrical steering interlock only locks when the following signals indicate the vehicle is at a standstill:
- Speed signal on the serial interface.
- Signal regarding the drive status on the CAN bus.
Both signals must indicate the vehicle is at a standstill. This plausibility check only takes place for the locking procedure.
Locking with Comfort Access
With Comfort Access, the vehicle is locked when the button on the outer door handle is touched. Here, the electrical steering interlock also locks. On vehicles with Comfort Access, the electrical steering interlock locks under the following conditions when the engine was started:
If the engine was not started, the electrical steering interlock locks after terminal R Off and door opening.
Or securing the vehicle if terminal R was on.
The CAS control module is the master control module for the central-locking system. On the basis of the operation request, the CAS decides whether the central-locking system is unlocked, locked or secured.
Note! Central double-locking only for certain country-specific options.
There is no motor for central double-locking in the US version.
The central-locking system of the doors, luggage compartment lid as well as fuel filler door is activated by the junction box electronics (JBE).
The CAS is the master control module for the power windows. Due to the various national versions, the functions of the power windows are strongly dependent on the coding.
The power windows in the doors are activated via the footwell module (FRM).
With Comfort Access, an identification sensor is required instead of the usual remote control. The identification sensor also performs the usual functions of the remote control. Comfort Access can be used to run the following functions:
The CAS control module is the master control module for functions run by Comfort Access. On vehicles with Comfort Access, a CA control module is fitted.
The vehicle order is stored in the CAS. The vehicle order describes the type of vehicle, national version and optional extras. Redundant to the instrument cluster, the following are stored in the CAS:
The vehicle identification number and odometer serve to prevent manipulation. The CBS data is important for regular maintenance in service. The CBS data must not be lost. The CBS data is updated within a drive cycle in the ignition key or remote control.
A drive cycle is defined by:
In addition, a hidden service function can be used to update the CBS data on the remote control:
Note! Hidden service function in an emergency.
In the event of faults in the catch for the remote control, there is a hidden service function for switching on terminal R. This can be used to prevent ”non-starters”. Press the START-STOP button for 10 seconds.
Observe the following information for diagnosis of the Car Access System:
Check of the remote control
The remote control can be checked using the BMW diagnosis system. If the remote control does not work, proceed as follows:
The BMW diagnosis system can be use the control-module functions of the CAS to measure the electrical field strength of the remote control. To do so, one of the buttons of the remote control must be pressed. When a value for the field strength is read out, it means:
Note! Declining field strength.
With increasing distance of the remote control from the vehicle, the measured field strength declines.
After replacement of the Car Access System (CAS), the following steps must be carried out:
The calibration between the CAS and the Digital Diesel Electronics (DDE) is located in the service functions. On calibration, the random codes for the electronic immobilizer (EWS, 3rd generation) are initialized.
There is no motor for central double-locking in the US version.
No liability can be accepted for printing or other faults. Subject to changes of a technical nature