Initial P
rint
Dat
e: 10/06
Table of Contents
Subject Page
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Input/Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
System Circuit Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
System Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Control Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Control Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
ID Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Voltage Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Data for Conditioned Based Service . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Antennas for Comfort Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Antenna Installation Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Exterior Antennas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Interior Antennas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Luggage Compartment Antenna . . . . . . . . . . . . . . . . . . . . . . . . . .10
Outside Door Handle Electronics Module . . . . . . . . . . . . . . . . . . . . . . . .11
Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Capacitive Sensor 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Capacitive Sensor 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Outside Door Handle Hall Sensor . . . . . . . . . . . . . . . . . . . . . . . . . .11
Door Locks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Principles of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Function Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Passive Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Signal Path for Comfort Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Unlocking Sequence
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
15
Passive Entry for Upper Tailgate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Passive Go . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Issuing Start Enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Passive Exit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Locking P
rocedur
e
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
E70 Comfort Access
R
e
vision Dat
e:
Subject Page
Special Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Two ID transmitters Remain Inside the Vehicle . . . . . . . . . . . . . . . . .17
The ID Transmitter Inside the Luggage Compartment . . . . . . . . . . .17
Starting Engine without ID Transmitter . . . . . . . . . . . . . . . . . . . . . . . .17
Check Control Message, Terminal 15 . . . . . . . . . . . . . . . . . . . . . . . . .18
Unintentional Wake-up Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Locking with Engine Running . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
3
E70 Comfort Access
Comfort Access
Model: E70
Production: From Start of Production
After completion of this module you will be able to:
• Explain the Comfort Access system in the E70 X5
• Locate all the components used in the system
4
E70 Comfort Access
Using Comfort Access the customer can unlock and open the vehicle without active use
of the ID transmitter. It is unimportant how the customer wishes to access the vehicle. It
is important that the ID transmitter be located in the vehicle's immediate vicinity (approxi-
mately. 2m). It is sufficient to have the ID transmitter somewhere on your person.
Comfort Access was first introduced on the E65 (03/2002). The system was then gradu-
ally introduced on different BMW models.
These models are:
• E87 from 09/2004
• E90 from 03/2005
• E60 from 09/2005
• E61 from 09/2005
• E63 from 09/2005
• E64 from 09/2005
• E91 from 09/2005
• E92 from 05/2006.
Comfort Access is available on the E70 from SOP (Start of Production).
The benefits of Comfort Access are:
• High level of convenience when unlocking and locking the vehicle
• Quick and easy access to the vehicle
• Easy engine start/shutdown
• Maximum comfort for the driver
• No more annoying hunting for keys.
The system is based on the Comfort Access on the E90/E91. Inserting a hand into the
handle r
ecess of the outside door handle unlocks and then opens the vehicle. The vehi-
cle is locked by touching the sensitive area of the outside door handle.
For vehicles fitted with Soft Close Automatic, the Soft Close Automatic drive fully closes
the vehicle door. The sensitive area can then be used to lock the vehicle.
To allow the engine to start, an ID transmitter must be located in the vehicle interior. This
being
the case, when the START-STOP button is pressed, the engine starts and the
vehicle is ready for use.
Introduction
Input/Output
5
E70 Comfort Access
System Overview
Index Explanation Index Explanation
1
Driver's door lock cylinder
7
Interior antenna x 5
2
Lock with door contact x 4
8
Outside door handle electronics module
3
F
ootwell module FRM
9
S
TART-STOP button
4
Car
Access System 3 CAS 3
10
ID
transmitter
5
Junction box control unit JB
K-C
AN
Body CAN
6
Comfort access CA
C
AS-Bus
CAS-bus (K-bus protocol)
6
E70 Comfort Access
S
ystem Circuit Diagram
L
egend for System Circuit Diagram
7
E70 Comfort Access
Index Explanation Index Explanation
1
Driver's door lock cylinder, Outside door handle
electronics
10
Rear window with antenna for remote
control functionality
2 Footwell module FRM 11 Luggage compartment antenna
3 Car Access System 3 CAS 3 12
Rear driver's side outside
door handle electronics
4 Junction box control unit JB 13 ID transmitter slot
5 Front-passenger outside door handle electronics 14 START-STOP button
6
Passenger-side outside door handle electronics
inside
15 Front interior antenna
7 Luggage compartment antenna 16 Rear interior antenna
8 Comfort access CA 17 FBD antenna amplifier in diversity module
9
Luggage compartment antenna
outside tailgate area
Control Unit
The Comfort Access control unit is located at the rear right of the luggage compartment.
Comfort Access controls the transmit antennas for the exterior and interior.
The signals from the outside door handle electronics modules are read in and trans-
ferred via the CAS bus to the Car Access System 3.
8
E70 Comfort Access
System Components
Index Explanation Index Explanation
1
Comfort Access
4
Vertical Dynamic Management
2
Trailer module
5
Electronic ride-height control
3
Park Distance Control
9
E70 Comfort Access
Control Elements
ID Transmitter
The ID transmitter for Comfort Access must be actuated by means of a radio signal. The
ID transmitter is therefore equipped with a receiver for the coded 125 kHz radio signal
that is transmitted by the outside door handle electronics module. The radio signal
enables the ID transmitter to register with the vehicle (authentication).
For this purpose, the ID transmitter emits a coded 868 MHz high-frequency signal to
enable identification of the ID transmitter as being valid and belonging to the vehicle.
The ID transmitter is exclusively responsible for use of Comfort Access.
The ID transmitter for Comfort Access has a battery, representing the externally identifi-
able difference compared to the remote control which features an integrated recharge-
able battery. The service life of the battery in the ID transmitter is about 2 years.
Voltage Monitoring
The ID transmitter monitors its own battery voltage.
The battery voltage is monitored in 2 stages.
The first stage signals to the Car Access System 3 that
the battery is flat. In response, the Car Access System 3
generates a check control message. The check control
message informs the customer that the battery needs to
be changed.
If the battery is not changed, the voltage monitoring
facility switches to the second stage. This means that
the data in the ID transmitter are saved. The ID transmit-
ter is then set "inoperable".
Data for Conditioned Based Service
When terminal status "terminal 15 ON" is selected, data for the Conditioned Based
Service is transferred to the ID transmitter using the interior antennas. The ID transmitter
then confirms that the transmission was received.
Index Explanation
1
Unlock button for mechanical key
2
Battery compartment
Antennas for Comfort Access
Nine antennas are built in for Comfort Access.
Four of these can be found in the outside door handle electronics modules and five in
the vehicle interior/luggage compartment.
The antennas for the exterior and interior are inductive antennas and have a ferrite core
The antenna transmission frequency is 125 kHz. All messages that are sent via the
antennas are encrypted.
Antenna Installation Locations
Exterior Antennas
The exterior antennas are installed in the following locations on the E70:
• Front and rear driver's side outside door handle electronics
• Front and rear passenger-side outside door handle electronics
The antenna characteristic gives 2m of coverage around the vehicle.
Interior Antennas
The interior antennas are installed in the following locations on the E70:
• Passenger compartment, front
• Passenger compartment, center
• Luggage compartment, left and right
• Luggage compartment, near to the load edge, middle.
The antenna characteristic is spherical. The entire vehicle interior is covered by the
front and middle antennas.
Luggage Compartment Antenna
The luggage compartment antennas are of the same design as the interior antennas.
The antenna characteristic is configured so that the antennas in the luggage compart-
ment cover that whole area.
Interior Antenna
10
E70 Comfort Access
Outside Door Handle Electronics Module
The outside door handle is connected to terminal 30g and works inside a voltage range
of 9 V to 16 V.
The outside door handle electronics module is connected to the vehicle via the CAS bus
thus making available the information from the capacitive sensors and the Hall sensor.
With the aid of the 3 sensors, the electronic outside door handle module detects the
status of the outside door handle. Each change in the status of the outside door handle
module triggers the corresponding function.
These functions are:
• Trigger pulse by inserting a hand into the handle recess of the outside door handle;
Capacitive sensor 1
• Unlock request by pulling the outside door handle; Hall sensor
• Lock request by touching the sensitive area on the outside door handle; Capacitive
sensor 2
Sensors
To protect the battery, the outside door handle electronics module switches off the
capacitive sensors for the driver's side after 192 hours when the vehicle is at rest. The
passenger-side capacitive sensors are switched off after 72 hours.
Capacitive Sensor 1
A pulse is generated when a hand is inserted into the handle recess of the outside door
handle.The pulse wakes up the electronic circuitry in the outside door handle.
If the vehicle is in sleep mode, the electronics module will wake up the Comfort Access
and Car Access System 3. This involves the outside door handle electronics module
sending out a wake-up signal via the CAS-bus.
Comfort Access permanently switches on the remote control receiver in order to receive
the data sent from the ID transmitter.
Capacitiv
e Sensor 2
Touching the sensitive area generates a signal from the capacitive sensor 2 until contact
ceases. The electronic module in the outside door handle sends the request via the CAS
bus. The request is to lock the vehicle.
Outside Door
Handle Hall Sensor
The Hall sensor is a backup system for capacitive sensor 1. After 192 hours, the outside
door handle electronics in the driver's door enter sleep mode. This period begins when
the
vehicle is locked or unlocked. The Hall sensor remains operational for a longer period.
Sleep mode reduces the power consumption of the outside door handle electronics by
switching off the capacitive sensors. By pulling twice on the outside door handle (two Hall
sensor st
atus changes) the v
ehicle is unlocked.
11
E70 Comfort Access
Note: Both outside door handle electronics modules on the passenger-side
and the rear outside door handle electronics module on the driver's side
switch off after only 72 hours.
Door Locks
The capacitive sensor 1 initiates the vehicle unlocking procedure.
The door locks are equipped with an additional spring to ensure the vehicle can be
opened fast enough. The spring exerts pretension on the central locking drive unit for the
unlocking procedure. The door is already unlocked before an attempt is made to open it
with the outside door handle.
Note: If pulled very fast, however, it may be necessary to pull the outside door
handle a second time in order to open the door.
12
E70 Comfort Access
13
E70 Comfort Access
Comfort Access is divided into the following functions:
• Passive entry
• Passive go
• Passive exit
Comfort Access enables the central locking by allowing keyless
access to the vehicle.
The ID transmitter is an essential component of Comfort Access.
The ID transmitter comprises all remote control functionality, mean-
ing that it can be used in exactly the same way as a remote control.
Function Sequence
The ID transmitter sends out a coded signal as soon as the unlock or lock button is
pressed.
The signal from the ID transmitter is demodulated and conditioned in the remote control
receiver. This signal is also used by the Car Access System 3.
The ID transmitter can also be used to open the tailgate separately. For further informa-
tion, see the following chapter "Passive Entry for upper tailgate".
Passive Entry
The graphic in the next page shows the functional principle of "Passive entry".
Passive entry enables access to the vehicle without operating the ID transmitter (remote
control). The vehicle in sleep mode is woken with a valid ID transmitter (remote control).
Comfort Access is activated by grasping the outside door handle.
Principles of Operation
Note: The ID transmitter comprises the remote control function and is used
solely for Comfort Access.
For Comfort Access to work, the ID transmitter must be activated by
the vehicle via radio signal so it can register (be authenticated) with
the vehicle. This makes it possible to unlock the vehicle without
actively using the ID transmitter.
14
E70 Comfort Access
Index Explanation Index Explanation
1 Outside door handle electronics module TAGE 5 Car Access System 3 CAS 3
2 ID transmitter 6 Comfort access CA
3 Rear window antenna CAS bus CAS bus
4 Remote control receiver in diversity module K-CAN Body CAN
S
ignal Path for Comfort Access
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