Initial P
rint
Dat
e: 10/06
Table of Contents
Subject Page
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Input/Output Central Locking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
System Schematic Circuit Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
System Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Control Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Footwell Module (FRM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Car Access System 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Junction Box Control Unit (JB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Remote Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Driver's Door Lock Barrel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Central Locking Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Central Locking Drive Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Doors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Tailgate and Fuel Filler Flap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Manually Releasing the Fuel Filler Flap . . . . . . . . . . . . . . . . . . . . .12
Mechanical Release of Lower Tailgate . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Principles of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Unlocking/locking the Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Unlocking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Locking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Central Locking Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Mechanical Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Locking Button on Vehicle Doors . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Car
Access System 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Junction Box Control Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Footwell Module FRM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Opening the Upper Tailgate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Remote Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Int
erior
Tailgat
e B
utton . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Closing the Tailgate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Opening and Closing the Lower Tailgate . . . . . . . . . . . . . . . . . . . . . . . . .18
E70 Central Locking
R
e
vision Dat
e:
Subject Page
Special Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Automatic Locking (personal profile) . . . . . . . . . . . . . . . . . . . . . . . . . .19
Unlocking After a Crash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Selective Unlocking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
3
E70 Central Locking
Central Locking
Model: E70
Production: From Start of Production
After completion of this module you will be able to:
• Understand and explain the central locking system of the E70
4
E70 Central Locking
The central locking is the central vehicle access system. It is responsible for unlocking
and locking the vehicle. The central locking controls all vehicle doors, the upper section
of the two-piece tailgate and the fuel filler flap.
The central locking can be operated via the following components:
• Remote control
• Driver's door lock barrel (door lock)
• Center lock button
• Exterior tailgate button
• Identification transmitter and outer door handle electronic module TAGE for Comfort
Access.
A correspondingly adapted electrical system taken from the E90 is used in the E70.
For this reason, many components and functions stem from the E90.
The Car Access System now features the third generation of control units. The electron-
ic vehicle immobilizer 4 is also used in connection with the Car Access System 3.
The Car Access System 3 is backwards compatible with the Car Access System 2.
Therefore, the Car Access System 3 contains all the functions of its predecessor.
It is possible to open and close the vehicle both actively or passively.
Active means the vehicle is unlocked by pressing the button on the remote control and
can then be opened.
After closing the doors, the vehicle can be locked by pressing the Lock button.
Option SA 322 Comfort Access is required for the passive opening and closing function.
Passive means the vehicle is unlocked by grasping the outer door handle, provided the
identification transmitter is located within a radius of no more than approximately 2 m
from the vehicle. The locking function is triggered by touching the sensitive area on the
outer door handle.
A further option is SA 323 Automatic Soft-Close Function. The automatic soft-close
function is available for all vehicle doors. When equipped with the automatic soft-close
function, the vehicle door needs only to be gently pulled or pushed into the lock. The
automatic soft-close function then completely closes the door.
The central locking system is responsible for locking and unlocking the vehicle and
incorporates the vehicle doors, tailgate and fuel filler flap.
Note: The lower section of the tailgate is fully mechanical and can be opened
as soon as the upper section has been opened.
Introduction
5
E70 Central Locking
The Car Access System 3 (2) evaluates the signal from the remote control (1) and initi-
ates the vehicle unlocking or locking procedure. The junction box control unit (8) exe-
cutes the requests.
The lock barrel (11) in the driver's door is used for mechanically unlocking or locking the
door
.
The footwell module (10) evaluates the movement (status of Hall sensors) of the
lock barrel.
Index Explanation Index Explanation
1
Remote control
7
Central locking, tailgate
2
Car
Access System 3 CAS 3
8
J
unction box control unit JB
3
Cent
er-lock button
9
L
ock (4x) in vehicle doors
4
Central locking, fuel filler flap
10
Footwell module FRM
5
Exterior tailgate button
11
Driver's door lock barrel
6
Automatic soft-close drive unit, tailgate
K-C
AN
Bodyshell CAN
Input/Output Central Locking
System Overview
6
E70 Central Locking
System Schematic Circuit Diagram
L
egend for System Schematic Circuit Diagram
7
E70 Central Locking
Index Explanation Index Explanation
1
Unlocking glove compartment, inside vehicle
18
Hall sensors for automatic soft-close, rear dri-
ver's side
2
Glove compartment lighting
19
Door contact, central locking, rear driver's side
3
Unlocking glove compartment, outside vehi-
cle
20
Automatic soft-close SCA, driver's door
4
Door contact, central locking,
front passenger's door
21
Hall sensors for automatic soft-close,
driver's door
5
Hall sensors for automatic soft-close,
front passenger's door
22
Lock barrel, door contact, central locking,
driver's door
6
Automatic soft-close SCA
front passenger's door
23
Footwell module FRM
7
Door contact, central locking,
rear passenger's side
24
Unlock button for glove compartment
8
Hall sensors for automatic soft-close,
rear passenger's side
25
Center-lock button
9
Automatic soft-close SCA,
rear passenger's side
26
Junction box control unit JB
10
Central locking, fuel filler flap
27
Center console switch cluster
with tailgate button, inside
11
Relay, automatic soft-close, tailgate
28
Integrated automatic climate control IHKA
12
Luggage compartment light
29
Car Access System 3 CAS 3
13
L
uggage compartment light
30
R
emote control receiver in diversity module
14
Automatic soft-close drive unit, tailgate
31
Rear window antenna, remote control services
15
Button, tailgate, exterior
K-CAN
Bodyshell CAN
16
Centr
al locking, t
ailgate
Kl. 30g
T
erminal 30 switched
17
Automatic soft-close SCA, rear driver's side
Kl. 30
Terminal 30
8
E70 Central Locking
The signal from the remote control is received via the rear window antenna (31). The
remote control receiver integrated in the diversity module (30) forwards the signal to the
Car Access System 3 (29). After successfully checking the signal, the Car Access
System 3 initiates activation of the central locking. The Car Access System 3 is the cen-
tral control unit for the central locking.
The junction box control unit (26) executes the vehicle unlocking and locking functions.
The footwell module (23) evaluates the status of all door contacts (4, 7, 19 and 22). It
makes available the respective status via the K-CAN. In this way, the Car Access System
3 can prevent the vehicle being locked with the driver's door open.
The junction box control unit evaluates the status of the center lock button (25). The
junction box control unit activates the central locking corresponding to the status. The
junction box control unit is also responsible for registering the status and activating the
central locking in the tailgate.
In addition, the junction box control unit drives the fuel filler flap (10).
The footwell module evaluates the signals from the Hall sensors for the lock barrel (22)
and makes this information available on the K-CAN.
Based on
this information, the Car Access System 3 is informed of the status of the door
lock in the driver's door. This is important for the case when a request to unlock or lock
the vehicle is triggered via the remote control.
K-CAN signals at Car Access System 3
In/out Information Source/sink Function
In Crash signal
Crash sensor > Advanced
crash safety management
Unlock central locking
in the event of a crash
In Vehicle speed
Rotation rate sensor >
Dynamic stability control
Lock as from a defined
vehicle speed
Out
Hall sensor status, driver's
door lock barrel
Driver's door lock barrel >
Footwell module
Convenient opening
of vehicle
Out
Hall sensor status, driver's
door lock barrel
Driver's door lock barrel >
Footwell module
Convenient closing
of vehicle
9
E70 Central Locking
Control Units
Footwell Module (FRM)
The footwell module is installed at the left-hand A-pillar. It evaluates the status of the
door contacts and reads in the Hall sensor signals of the lock barrel in the driver's door
and transfers the information via the K-CAN to the junction box control unit or Car
Access System 3.
Car Access System 3
The Car Access System 3 is installed on the left next to the steering column. It assumes
the master function for the central locking. The Car Access System 3 has the exclusive
system authorization and is simply supported by the other control units.
Junction Box Control Unit (JB)
The junction box control unit is plugged into the front power distribution box.
The junction box control unit contains the relays for activating the central locking drive
units.
The tailgate central locking is activated via a power output stage in the junction box con-
trol unit. The drive unit for the automatic soft close function is powered by a relay in the
rear power distribution box. The junction box control unit activates the relay.
The signals from the exterior tailgate button and center-lock button are also sent to the
junction box control unit and transferred to the Car Access System 3.
The remote control receiver is powered by the rear power distribution box.
Note: The power distribution box and the junction box control unit are two
separate components. Keep this in mind when performing service work.
System Components
10
E70 Central Locking
Controls
The central locking can be operated from the following controls:
• Remote control
• Identification transmitter (Comfort Access only)
• Driver's door lock barrel
• Center-lock button
Remote Control
Each vehicle is delivered with one spare key and two remote control units. The adapter
for the spare key is located in the glove compartment.
The remote control has three buttons for operating the central locking system.
There is a rechargeable battery in the remote control that is charged by means of a
transponder coil in the remote control holder. The mechanical key is integrated in the
remote control.
The remote control has a 512 MB data memory. The following data can be stored in the
remote control:
Note: The remote control receiver is integrated in the antenna diversity facility
and forwar
ds the remot
e control signal to the Car Access System 3.
Index Explanation
1
Unlock/convenient open button
2
Lock/convenient close button
3
Button for OPEN tailgate
4
Mechanical key
Data Explanation
km reading (mileage) Current km reading of vehicle
VIN
Key number Number of remote control
Fault code memory entries from SAM 2.5, the fault entries are indicated linked to possible measures in PuMA
NAVI-DVD version Data status of navigation DVD
Engine oil Information on topping up or draining the engine oil, e.g. overfilling
Battery condition Battery charge status
Integration stages Integration stage that left the factory, last programmed or currently available
11
E70 Central Locking
Driver's Door Lock Barrel
The lock barrel is connected mechanically via a linkage to the door lock. Hall sensors for
the lock barrel are integrated in the door lock.
The footwell module evaluates the signals from the Hall sensors for locking/unlocking
purposes.
Central Locking Button
The center-lock button is installed between the center of the outlets in the dashboard.
The center-lock button forms one unit together with the hazard warning lights button.
12
E70 Central Locking
Central Locking Drive Units
A central locking drive unit consists of an electric drive unit and the unlocking/locking
mechanism.
Doors
The central locking drive units in the doors are equipped with two motors to facilitate the
unlocking/locking and central arrest functions of the vehicle.
Central arrest means that the locking button in the doors is separated mechanically from
the central locking drive unit.
As a result, the vehicle cannot be opened by pulling the locking button.
The Hall sensor for the door contact is additionally integrated in the central locking drive
unit.
Tailgate and Fuel Filler Flap
The central locking drive units for the tailgate and fuel filler flap are each equipped with a
motor for unlocking/locking purposes.
The central locking drive unit in the tailgate contains the tailgate contact. The tailgate
contact serves the purpose of signalling tailgate "OPEN" or "CLOSED".
The tailgate is additionally equipped with the drive unit for the automatic soft-close func-
tion. This drive unit also features a motor.
The automatic soft-close drive unit also has a contact for the automatic soft-close func-
tion.
Manually Releasing
the Fuel Filler
Flap
The fuel filler flap can be unlocked manually in the event of an electrical defect. The
release device is located in the luggage compartment on the right behind the luggage
compartment cover.
1. Remove cover
2. Pull green knob with fuel pump symbol.
13
E70 Central Locking
Mechanical Release of Lower Tailgate
The E70 features a fully mechanical release function for the tailgate.
Locking of the lower tailgate is not monitored.
The left and right lock are released by turning the handle (2). The rotary motion of the
handle is transferred to the lock/unlock mechanism and in turn to the bowden cables. The
tailgate can be folded down after releasing the locks.
Fully Mechanical Release E70
Index Explanation Index Explanation
1
Bo
w
den cable r
elease, left
4
L
ock on right in lo
wer tailgate
2
Release handle
5
Lock/unlock mechanism
3
Bowden cable release, right
6
Lock on left in lower tailgate
14
E70 Central Locking
Unlocking/locking the Vehicle
The central locking system can be activated only when the driver's door is closed.
The vehicle unlocking/locking system is composed of the following system components:
• Remote control/identification transmitter
• Center-lock button
• Mechanical key/spare key
• Comfort Access - Outer door handle and exterior tailgate button (tailgate only)
The central locking system activates the following system components:
• Central locking, driver's and front passenger's door
• Central locking, rear doors
• Central locking, fuel tank
• Central locking, tailgate
The procedure for unlock-
ing the tailgate by pressing
the tailgate symbol on the
identification transmitter is
shown in this diagram.
Index Explanation Index Explanation
1
Identification
transmitter
8
Centr
al locking, driver's door
2
Rear window antenna
9
Central locking, fuel filler flap
3
R
emot
e control receiver in diversity module
10
Central locking,
t
ailgate
4
Car Access System 3 CAS 3
11
Relay, automatic soft-close, tailgate
5
Junction box control unit JB
12
Automatic soft-close drive unit, tailgate
6
R
ela
y
f
or
centr
al locking
13
F
ootw
ell module
7
Central locking, front passenger's and rear doors
14
Door contacts
Principles of Operation
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