Initial P
rint
Dat
e: 10/06
Table of Contents
Subject Page
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Equipment Variants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Input/Output Interior Lighting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Schematic System Circuit Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
System Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Interior Lighting, Front . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Roof Function Center . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Interior Light Unit, Rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Control Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Car Access System 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Footwell Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Junction Box Control Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Roof Functions Center . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Principles of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Footwell Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Switching On . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Switching-On Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Switching Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Switch-Off Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Electric Load Shut-Down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Terminal 58g . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Hazard Warning Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Roof Functions Center . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Interior Lighting Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Terminal 58g
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Luggage Compartment Lighting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Glo
ve Compartment Lighting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Car Access System 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
E70 Interior Lighting
R
e
vision Dat
e:
2
E70 Interior Lighting
Interior Lighting
Model: E70
Production: From Start of Production
After completion of this module you will be able to:
• Identify the components used in the interior lighting system
• Explain which control units are responsible for the interior lighting system
• Understand the Welcome light feature
3
E70 Interior Lighting
The interior lighting in the E70 is based on the interior lighting system implemented in
the E90. The interior lighting comprises the roof area, luggage compartment, footwell
and inner door lighting.
The lighting in outer area of the doors is provided by the courtesy lighting (outer door
handles) and the exit lights. The interior lighting in the roof area on the rear driver and
passenger sides consists of two separate lamps. A new feature is the split glove com-
partment.
The complete glove compartment lighting is powered and controlled by an electronic
module in the unlocking/release drive unit.
The following diagram shows where the control units responsible for the interior lighting
are located in the E70.
Introduction
Index Explanation
1
Junction box control unit
2
A
dvanced crash safety management
3
Roof function center
4
Car access system 3
5
Comfort Access
6
Footwell module
Equipment Variants
The interior lighting system in the E70 is available in the standard version and the option-
al version SA 563 or included with the premium package.
The following table provides an overview showing what components are installed in the
respective configuration variant.
4
E70 Interior Lighting
Component Standard Option SA
Front interior lights unit with:
• Interior light with interior light switch
• Reading light with reading light button, driver and passenger
• Top light, driver and passenger
X
X
X
Front door compartment lighting, driver/passenger side
Front door handle lighting, driver/passenger side
Front sill lighting, driver/passenger side
Exit light, driver/passenger side
Courtesy lighting, driver/passenger side
Vanity mirror light, driver and passenger
Footwell lights, driver and passenger
Glove compartment light
X
X
X
X
X
X
X
X
Rear interior lights unit, driver and passenger side:
• Interior light with interior light switch
• Reading light with reading light button, driver and passenger
X
X
Rear interior light, driver/passenger side
Rear door compartment lighting, driver/passenger side
Rear door handle lighting, driver/passenger side
R
ear footwell lights, driver and passenger
R
ear sill lighting, driver/passenger side
Rear exit light, driver/passenger side
Courtesy lighting, driver/passenger side
X
X
X
X
X
X
X
The input/output diagram comes immediately after the following description and shows
a general overview of the input and output signals.
The status of the door contact (Hall sensor) in the lock (3) changes, for example, when
the door is opened with the vehicle unlocked. The footwell module (1) evaluates the sta-
tus and sends the request to switch on the interior lighting. The roof functions center
(10) switches on the interior lighting in the area of the roof.
Parallel to this, the exit light (19) of the opened vehicle door as well as the footwell light-
ing (18) are switched on. The status of the door contact changes again when the vehicle
door is closed. The footwell module initiates the procedure to switch off the interior light-
ing.
The status of the rear hatch contact in the rear window central locking (13) changes
when the rear hatch is opened. The lighting for the luggage compartment (14) is con-
nected to the power supply via terminal 30g so that the luggage compartment lights are
switched on via the rear hatch contact.
5
E70 Interior Lighting
System Overview
6
E70 Interior Lighting
I
nput/Output Interior Lighting
L
egend for Input/Output Interior Lighting
7
E70 Interior Lighting
Index Explanation Index Explanation
1
Footwell module FRM
13
Central locking, rear hatch
2
Driver's door lock barrel
14
Rear reading/interior light 2x
3
Lock with door contact
15
Door compartment lighting, rear
4
Front footwell light 2x
16
Door compartment lighting,front
5
Grip recess plate lighting, inner door handle
17
Identification transmitter
6
Courtesy lighting, outer door handle 4x
18
Footwell light 2x
7
Glove compartment button
19
Exit light 4 x
8
Junction box control unit JB
20
Car access system 3 CAS 3
9
Vanity mirror light 2x
K-CAN
K-CAN Body CAN
10
Roof functions center
KL 30
Kl. 30 Terminal 30
11
Glove compartment light
KL 58g
Terminal 58g
12
Luggage compartment lighting
IB
Interior lighting control
K-CAN signals at the footwell module
In/out Information Source/sink Function
In
Status,
central locking
Car access system 3 >
footwell module
Interior lighting ON
In
Status,
central locking
Car access system 3 >
footwell module
Interior lighting OFF
In Crash signal
Crash sensor >
advanced crash safety management
Interior lighting ON
Out
Electrical load
cutout
Footwell module >
junction box control unit
Interior lighting OFF
through electrical load cutout
Out
Status,
terminal 58g
Light switch >
footwell module
Instrument lighting ON (control buttons,
instrument cluster, gear selector lever)
S
chematic System Circuit Diagram
8
E70 Interior Lighting
L
egend for Schematic System Circuit Diagram
Note: Concerning item 3: The in-car unlock/release drive unit of the glove com-
partment supplies the power for the glove compartment lighting (5).
9
E70 Interior Lighting
Index Explanation Index Explanation
1
Lighting in driver's door
16
Automatic soft-close drive unit
2
Footwell light, driver's side
17
Central locking, rear hatch
3
Glove compartment unlock drive unit
18
Rear hatch contact
4
Footwell light, front passenger's side
19
Interior/reading light, rear driver's side
5
Glove compartment light
20
Footwell light, rear driver's side
6
Lighting in passenger's door
21
Roof functions center FZD with interior/reading
light and top light at front
7
Junction box control unit JB
22
Footwell module FRM
8
Lighting in door, rear passenger's side
23
Lighting in door, rear driver's side
9
Footwell light, rear right
24
Vanity mirror light with switch, driver's side
10
Interior/reading light, rear passenger's side
25
Vanity mirror light with switch, passenger's side
11
Connection to junction box control unit
K-CAN
Body CAN
12
Relay for automatic soft-close drive unit
KL 30
Terminal 30
13
Luggage compartment light, right
KL 58g
Terminal 58g
14
Luggage compartment light, left
IB
Interior lighting control
15
Outer rear hatch button
K-CAN signals at the footwell module
In/out Information Source/sink Function
In
Status,
central locking
Car access system 3 >
footwell module
Int
erior lighting ON
In
Status,
central locking
Car access system 3 >
footwell module
Int
erior lighting OFF
In Cr
ash signal
Crash sensor >
advanced crash safety management
Int
erior lighting ON
Out
Electrical load
cutout
Footwell module >
junction box control unit
Interior lighting OFF
through electrical load cutout
Out
Status,
terminal 58g
Light switch >
footwell module
Instrument lighting ON (control buttons,
instrument cluster, gear selector lever)
10
E70 Interior Lighting
Interior Lighting, Front
The components for the interior lighting in the front roof area are integrated in the roof
functions center and in the sun visors. The footwell lighting is located on the underside
of the dashboard.
Roof Function Center
The interior light unit is integrated in the roof functions center. Therefore, a roof functions
center is always installed in the E70.
The vanity mirror lighting on the driver and passenger sides is powered by the roof func-
tions center.
Various equipment options make it necessary to install additional components in the roof
functions center.
If a panoramic glass roof is installed, the roof functions center contains not only the but-
ton for the panoramic glass but also the necessary control and monitoring facilities.
The ultrasonic interior movement detector is completely integrated in the roof function
center on vehicles equipped with an anti-theft alarm system.
The rood function center simply loops through the signals for all other components. This
means the components are connected directly to their respective control units.
These components are:
• Emergency call button • Passenger airbag OFF lamp
• Microphone for telephone • Microphone for voice input.
System Components
Index Explanation
1
Openings
for ultrasonic interior movement detector
2
Ambient lighting
3
Passenger's side microphone for voice input
4
Passenger airbag OFF light
5
P
assenger's reading lamp
6
Interior light
7
P
assenger's reading light button
8
Interior lighting button
9
Driver's reading light button
10
Driver's reading light
11
Emergency call button
12
Button for panoramic glass roof
13
Telephone microphone, driver's side
11
E70 Interior Lighting
Interior Light Unit, Rear
Two versions of the rear interior light unit are available for the E70:
• Standard version connected directly to the footwell module
• Optional version connected directly to the roof functions center.
In the standard version, the E70 has one interior light at the rear left and right.
The optional version features one interior light unit at the rear left and right.
The interior light unit consists of:
• Reading light, rear left/right with button
• Interior light.
Rear interior light/interior light unit
Index Explanation
1
Interior light, rear
2
Rear interior light with button and reading lamp
3
Rear interior light, panoramic glass roof
4
Rear interior light, panoramic glass roof with button and reading light
12
E70 Interior Lighting
Control Units
The "interior lighting" function is distributed over several control units that communicate
with each other via the K-CAN. The individual control units are described in the following.
Car Access System 3
The car access system 3 sends the request to unlock/lock the central locking via the K-
CAN.
The signals are required to switch the interior lighting on and off.
Footwell Module
Based on the signals from the car access system 3, the footwell module recognizes the
request to switch the interior lighting on/off.
The following components are actuated directly by the footwell module:
• Courtesy lighting
• Exit lights
• Handle-recess light
• Storage space lighting
• Footwell lighting
The footwell module sends the roof function center the information to switch on the inte-
rior lighting in the roof area. The individual lamps are activated by the roof functions cen-
ter.
The footwell module evaluates the status of the door contacts. The interior lighting is
switched on when a door is opened.
Junction Box Control Unit
The junction box control unit is the interface to the luggage compartment and glove com-
partment lighting. It supplies the power (terminal 30g) the lighting in the luggage com-
partment. For lighting purposes, it reads the status of the button for unlocking and releas-
ing
the glove compartment.
The junction box control unit is connected directly to the electronics of the unlock/release
de
vice on the left
and right, which it uses to make available the start signal for unlocking
the glove compartment.
Roof Functions Center
The roof functions center directly activates the front interior light unit and powers the rear
interior light unit on the C-pillar. The vanity mirrors are also powered by the roof function
center.
13
E70 Interior Lighting
The interior lighting on the E70 is switched on and off by the footwell module FRM.
The roof functions center FZD is responsible for the interior lighting components in the
roof area.
The luggage compartment lighting is connected directly to terminal 30g. The following
description outlines the interaction between the control units and functions in the interi-
or lighting system.
Footwell Module
The footwell module is the central control unit for the interior lighting system. All interior
lighting outputs of the footwell module are pulse-modulated. This ensures the interior
lighting functions at a constant brightness level in the event of voltage fluctuations. The
pulse width modulation is additionally used for the soft ON/soft OFF function.
The footwell module features the following functions for the interior lighting:
• Switching the interior lighting on/off
• Electric load shut-down after 8 minutes
• Lighting via terminal 58g.
Switching On
The footwell module receives numerous input signals that switch on the interior lighting.
The input signals from the footwell module are read in directly or received via the K-
CAN. The input signals for the interior lighting are listed in the following.
Principles of Operation
Input Signals From
Central locking signals CAS 3
Crash signal ACSM
Door contacts FRM
Driver's door barrel lock FRM
Interior light switch FRM/FZD
Centr
al locking, r
ear
hatch
JB
14
E70 Interior Lighting
Switching-on Conditions
The interior lighting is switched on in response to one of the following conditions for
switching on the interior lighting. The switch-on function is limited in terms of time. The
electrical loads are:
• Unlock via barrel lock in driver's door
• Unlock via remote control/identification transmitter
• Terminal R OFF when terminal 58g was ON max. 2 minutes ago
• Lock button on remote control/identification transmitter pressed when the central
locking has been in central arrest state for longer than 10 s
The interior lighting remains permanently switched on in certain situations. These situa-
tions are:
• Receiving crash signal
• Interior lighting button briefly pressed.
Switching Off
The footwell module receives numerous signals to switch off the interior lighting. The sig-
nals are received via the K-CAN or are read in directly by the footwell module.
Switch-off
Conditions
The interior lighting is switched off under the following conditions:
• Central locking in central arrest, all doors and the rear hatch are closed
• Terminal R OFF after 8 minutes (electric load shut-down)
• Interior lighting button pressed for longer than 3 s
• Terminal R ON with doors closed
• Terminal 58g ON and terminal R OFF. The interior lighting is switched off if no door
is opened within 20 s.
• The interior lighting is switched off if the vehicle is unlocked via the remote
control/identification transmitter and no door is opened after 20 s.
• Terminal R OFF and a vehicle door is opened for longer than 1 minutes
• "Power down" via diagnosis
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