The functions of the central locking system on the R70 are shared among a number of control units. The Car Access System (CAS) monitors all the processes in the central locking system. The CAS is the master control unit for the central-locking system.
The control units involved in the central-locking system are:
The following components are described for the central-locking system:
The driver's door lock cylinder allows manual locking/deadlocking and unlocking of the vehicle. In the event of failure of the motor vehicle electrics, the driver's door can be unlocked using the mechanical key in the remote control.
The signals from the door contact are picked up by the footwell module (FRM). The FRM forwards the signals on the K-CAN to the junction box electronics (JBE).
The remote control allows radio-controlled locking and unlocking of the vehicle. The radio signals from the remote control are received by the remote control receiver and transferred to the Car Access System (CAS). The remote control receiver is fitted in the interior rearview mirror.
The central locking button allows the vehicle to be locked/unlocked from the passenger compartment. The following are locked / unlocked:
Double-unlocking and deadlocking are not possible using the central lock button
The interior boot lid / tailgate button is located in the centre console switch cluster (SZM). The outside boot lid button can be used to open the boot lid if the vehicle is unlocked and stationary.
All functions for control of the central-locking system are integrated in the CAS control unit. The commands are transferred across the K-CAN to the junction box electronics (JBE).
The JBE is the executing control unit for the central locking system. The JBE handles activation of all the central-locking drives. The JBE consists of the junction box electronics and the power distributor. The junction box is installed under the glove compartment.
The FRM evaluates the status of the door contacts. When the vehicle is locked or unlocked with the mechanical key element, the FRM will recognise this request. The FRM sends a message to the CAS control unit on the K-CAN. The FRM is installed at the A-pillar in the footwell of the driver's side.
Block circuit diagram E70
Index |
Explanation |
Index |
Explanation |
|---|---|---|---|
1 |
Junction box electronics (JBE) |
2 |
Central-locking drive, front passenger side |
3 |
Soft Close Automatic system (SCA), door on the front passenger's side |
4 |
Central-locking drive, rear passenger-side |
5 |
Soft Close Automatic system (SCA), rear passenger's side |
6 |
Central-locking drive for fuel filler flap |
7 |
Relay for drive of Soft Close Automatic system (SCA) |
8 |
Soft Close Automatic system (SCA), luggage compartment lid |
9 |
Boot lid button |
10 |
Central locking drive, rear lid |
11 |
Soft Close Automatic system (SCA), rear driver's side |
12 |
Central-locking drive, rear driver-side |
13 |
Soft Close Automatic system, (SCA) driver's door |
14 |
Central-locking drive, driver's door |
15 |
Footwell module (FRM) |
16 |
Glove compartment button |
17 |
Central locking button |
18 |
Centre console switch cluster with luggage compartment lid button |
19 |
Car Access System (CAS) |
20 |
Remote control receiver |
21 |
Integrated automatic heating and air-conditioning system (IHKA) |
22 |
Rear window aerial |
The following system functions are described for the central-locking system:
A locked door cannot be opened from the outside. However, the door can still be opened from the inside. To do this, the door handle must be pulled twice. Locking us executed when
A deadlocked door cannot be opened from the inside or outside. A door is deadlocked if the vehicle is locked via the driver's door lock cylinder or the remote control. Conditions for deadlock:
When the vehicle is deadlocked, the anti-theft alarm (DWA) is also primed.
An unlocked door can be opened from the inside and the outside. When the vehicle is unlocked, the anti-theft alarm (DWA) is also deactivated. In the event of failure of the power supply, the driver's door can be unlocked using the mechanical key in the remote control.
A crash is detected by the multi-restraint system (MRS). A crash signal is sent to the CAS. The message is sent on the K-CAN. The CAS unlocks the vehicle. All operating points are disabled when there is a crash signal. This prevents unintentional actions of the central locking system from occurring due to short circuits caused by the accident. The central locking system can only be reactivated after a crash once terminal R has been switched off for at least 3 seconds.
When the CAS detects that a remote control is locked in place in the slot, the central locking system is released. The central locking system assumes the ”Lock” position. The anti-theft alarm system is also deactivated during forced release.
To protect the driver against unintentionally locking himself out, all operating points are locked when the driver's door is open. This makes any additional mechanical lock-out protection in the door locks unnecessary.
To protect the central-locking drives against overload, the CAS monitors repeat operations. The door, luggage compartment lid, glove compartment and the fuel filler flap are monitored. If there are more than fifteen attempts at activation within one minute, the drives are not unlocked for a certain time.
If the central-locking system is unlocked via the remote control and within two minutes no door or the luggage compartment lid is opened, locking takes place automatically.
The function range for the central locking system is specified as being from 9 to 16 volts. Outside of this range, the drives are not activated. If the power supply is interrupted, the state of the central-locking system does not change (anti-theft protection!).
The first time there is an unlocking command, only the driver's door is unlocked. The central locking system sets all other doors from deadlock to lock. The DWA is switched off and the doors remain locked. With a second unlocking command, the remaining doors are unlocked. This function can be activated via the Car and Key Memory (depending on the national version).
The central locking system is automatically locked from a speed of approx. 16 km/h. This function can be activated via the Car and Key Memory.
Nearly all Car and Key Memory functions are programmed inside the vehicle itself.
No liability can be accepted for printing or other errors. Subject to changes of a technical nature