Table of Contents

E83 Body Electrical

Subject Page

Voltage Supply and Bus Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Battery Lead . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Bus Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
K-Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
PT-CAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Diagnosis Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Sub-Bus Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Energy Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Starter Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

General Vehicle Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
GM5 Redesign . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Power Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Central Locking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Wipers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Wiper Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
SRA Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Heated Wiper Nozzles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Headlight Washer System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Rear Window Wiper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Anti-Theft Alarm System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Park Distance Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Tire Pressure Control System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Exterior Lighting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Center Console Switch Center (SZM) . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Displays and Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

Instrument Cluster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Indicator and Warning Lamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Predrive Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
LC Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

Initial Print Date: 10/03 Revision Date: 11/03

Subject Page
Displays and Controls (cont.)
Program and Gear Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Control Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
On-Board Computer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Test Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Locking and Unlocking Test Functions . . . . . . . . . . . . . . . . . . . . . . . .21
Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
CID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
SIA IV Service Interval Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Resetting Service Interval Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

Information and Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

Radio and CD Changer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
CD Changer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
CDC Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Aerial System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
AM and FM Aerials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Aerial Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
FM Aerial Diversity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Service Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
BMW Business CD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
CID Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Car and Key Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

Audio Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

New Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
HiFi System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
HiFi Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Top HiFi System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Top HiFi Audio System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
SPDIF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

Telephone System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

Telematic Control Unit TCU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Principle of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Compensator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
GPS Aerial . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
Telephone Aerial . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36

Navigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
Body Electrical

Model: E83

Production: Start of Production MY 2004

After completion of this module you will be able to:

• Identify locations of major electrical components

• Know the differences in the audio systems

• Relate Bus Systems Layout

3
E83 Body Electrical
Voltage Supply and Bus Systems
The E83 electrical system is on the E46 electrical system and E85 system components.
The systems have been adapted to the vehicle and their functions improved and
extended.
The bus systems K-bus, PT-CAN, LIN bus and the diagnosis bus are used. The instru-
ment cluster is the central gateway module. The luggage compartment houses the
vehicle battery and the luggage compartment fuse holder. The luggage compartment
fuse holder supplies the glovebox fuse holder.

Voltage Supply Schematic

M G
4

1 2
R

12 15

R 15

0 1 2

30

5
50

10 11

8 30
EWS KOMBI
9
+
TE03-3311

7 6 -

1. Starter 7. Luggage compartment fuse holder

2. Alternator 8. Valvetronic or common rail
3. Not used for U.S. 9. Top HiFi amplifier
4. Glovebox fuse holder 10. Electronic immobilizer
5. Safety battery terminal 11. Instrument cluster
6. Vehicle battery 12. Ignition/starter switch

4
E83 Body Electrical
Power Supply

Battery
Different vehicle batteries with different capacities are used depending on the engine and
equipment specification. The battery is located in the luggage compartment in the
spare-wheel recess.

Battery Lead
The E83 has different battery leads depending on the engine variant. The B+battery
cable is routed through the interior of the X3, along the floor on the passenger side. The
B+ cable is made of aluminum and has a diameter of 80mm2.

Fuses
The E83 is equipped with two fuse holders. The luggage compartment fuse holder with
the fuse of the front fuse holder is located next to the vehicle battery in the spare wheel
recess.

E83 Luggage Compartment Fuse Box E83 fuse Panel behind Glove Box
w/ Top HiFi Fuse.

The glovebox fuse holder carries the majority of the fuses. The main fuses for the DME
and the ignition/starter switch are located on the rear side of the glovebox fuse holder.

Bus Systems
The Bus system of the E83 is based on the E46 with minor upgrades.
The following Bus Systems are used on the E83:
• K-Bus
• PT-CAN
• Diagnosis Bus
• Sub-Bus Systems (BSD, LIN, M, Data Interface)

5
E83 Body Electrical
K-Bus
The K-bus links the components of the general vehicle electrical system, the information
and communications systems and the safety system. The majority of the systems and
components has been taken from other models and adapted to the E83.
A new feature is the control system for the new panorama sunroof (MDS) and the safety
system (MRS4RD).
The satellite radio (SDARS) has been adapted to the connection to the K-bus.
The data transfer rate is 9.6 kbit.

PT-CAN
The PT-CAN links the components of the control units for the drive and chassis systems.
Newly incorporated is the VG-SG control unit for the transfer case.
The data transfer rate is 500 kbit.

Diagnosis Bus
The diagnosis bus is connected with two leads to the overall bus system. The PIN 7
diagnostic connector lead is directed to the DME and transfers all the emissions-related
data from the engine management system and from the automatic gearbox.
The PIN 8 diagnostic connector is connected to the remaining control units either directly
or via the instrument cluster as gateway.
The data transfer rate is 9.6 kbit. The rate of transfer of emissions related data
KWP2000* (E-OBD and OBD) is 10.4 kbit.

Sub-Bus Systems
The following sub-buses are used in the E83:
• BSD Bit-serial data interface - connection of electronic engine management and
alternator
• LIN Local Interconnected Network - connection of AHL and bi-xenon headlights,
connection of GM5 and driver's or door mirror switch block
• M-bus - connection of IHKA/IHKR and stepping motors

Energy Management
Energy management for the E83 is taken from the E46. The software for regulating the
charging voltage is in the DME. In the event of an increased current consumption in the
vehicle electrical system, the charging voltage specification can be increased. The charg-
ing voltage specification is issued by the DME via the bit-serial data interface to the alter-
nator.

6
E83 Body Electrical
 K-Bus
E83 Bus Chart

Kombi

GM5RD EWS III+ CDC SES MRS 4 RD VG-SG

SVT
RLS LSZ RADIO NAV OC3 DSC
DSC-SEN

SM MFL HIFI SDARS LWS

AHL
SZM MDS TEL CID LIN-Bus DME/DDE

PDC IHKA XENON XENON EGS

PT-CAN

7
TE03-3306

E83 Body Electrical

7
 8
K-Bus

E83 Body Electrical

Kombi
E83 System Origin Chart

GM5RD EWS III+ CDC SES MRS 4 RD VG-SG

SVT
RLS LSZ RADIO NAV OC3 DSC
DSC-SEN

SM MFL HIFI SDARS LWS

AHL
SZM MDS TEL CID LIN-Bus DME/DDE

PDC IHKA XENON XENON EGS

PT-CAN

7
TE03-3826

E46 E53 E85 E60 E83

The charging voltage can be regulated as a function of the outside temperature. Thus the
battery can be charged to optimum effect. At low temperatures, the charging voltage can
be increased to obtain a higher capacity. At high temperatures, the charging voltage is
reduced to avoid excessive gassing. The maximum charging voltage is 14.8 V.
A battery change does not have to be communicated to the DME control unit.
Energy management also features the option of load/consumer shutdown. In the event of
excessive current consumption in the vehicle, the power output of the heated rear win-
dow can be reduced.

Starter Control
EWS III plus is used in the E83. The basic function of starter control and enabling of DME
and EGS has remained the same. With EWS III plus the terminal 50 information is for-
warded not from the starter motor but rather directly from the EWS control unit to the
instrument cluster. A circuit is hardwired from the output of the starter relay in the EWS III
plus control unit directly to the instrument cluster. In order to avoid erroneous measure-
ments, no sensor values are stored during the starting process.

General Vehicle Electrical

Introduction
The general vehicle electrical system of the E83 is for the most part based on the central
body electronics 5 ZKE 5 of the E46.
The functions of the general vehicle electrical system are comparable to those of the
general vehicle electrical system on the E46:
• Central locking
• Power windows, different to the E46
• Wipe/wash system
• Anti-theft alarm system
• Interior Lights
• Consumer shutdown
• Remote control operation
• Door mirror control
• Car and Key Memory

9
E83 Body Electrical
System
Overview

10
E83 Body Electrical
 1 Door mirror, left-hand side 33 Footwell lights

2 Central locking, driver's side 34 Ambient lights

3 Lock cylinder, driver's door 35 Power-window motor passenger side front with antitrap

4 Power window, driver's side with anti-trap protection 36 Central locking, passenger side, front

5 Center-lock button 37 Power-window switch, passenger side, front

6 Central locking system remote control 38 Center console switch center

7 Interior tailgate opening button 39 Integrated automatic heating and air conditioning

8 Tilt sensor 40 Rear-view mirror with rain/light sensor

9 Siren 41 Seat adjustment

10 Ultrasonic interior movement detector 42 Ignition/starter switch

11 Wiper switch 43 Digital motor electronics

12 Power-window switch, driver's side, rear 44 Electronic immobilizer

13 Power-window motor, driver's side rear with anti-trap 45 Light switch cluster

14 Central locking, driver's side,rear 46 Exterior lighting WIWA Wipe/wash system

15 Bonnet contact switch 47 Lights operating unit FH Power windows

16 Exterior tailgate opening button 48 Panorama glass sunroof drivemotor

17 Power distributor, front 49 Panorama glass sunroof control unit

18 Vanity mirror light 50 Panorama glass sunroof switch IB Interior Lights

19 Vanity-mirror light 51 Instrument cluster VA Consumer shutdown

20 Central locking, boot lid 52 Panorama glass sunroof drive motor

21 Fuel filler flap central locking 53 Outside temperature sensor

22 Central locking, passenger side,rear 54 EGS

23 Power-window motor,passenger side rear with antitrap 55 Engine management

24 Power-window switch, passenger side, rear 58 Door mirror, right

25 Headlight cleaning system relay K-BUS Body bus

26 Headlight cleaning system pump LIN-Bus Local Interconnected Network bus

27 Washer fluid pump PT-CAN Powertrain CAN

28 Relay, wipe/wash system ZV Central locking

29 Wipe/wash system DWA Anti-theft alarm system

30 Glovebox light FZV Central locking system remote control

31 Luggage-compartment light CKM Car and Key Memory

32 Interior/reading lights, front

11
E83 Body Electrical
The GM5RD communicates with the following components on the LIN bus:
• Door mirror, driver
• Door mirror, passenger side
• Switch block, driver
The stored positions of the door mirrors are lost if the GM5RD is replaced.

GM5 Redesign
The General Module 5 Redesign (GM5RD) is the heart of the general vehicle electrical
system. The GM5RD, which was used on the E85, has been further developed for the
E83 with a combined K-/LIN bus module. The K-/LIN bus module is integrated in the
GM5RD for operation of the door mirrors.

Power Windows
The power windows of the E83 are controlled by the GM5RD similar to the operation in
the E46. The anti-trapping feature has been modified and the anti-trap strip is not used
in the E83. Anti-trapping is provided by the EKS electronics included in the individual
window motors.
The SBFA (drivers door switch block assembly) is connected to the GM5RD via the LIN
Bus. The passenger door switch and both rear door switch assemblies are connected
directly via hardwire to the GM5RD.

1. SBFA
2. GM5RD
3. Driver’s power window motor
4. Driver’s door contact
5. Driver’s side rear door contact
6. Driver’s side rear window switch
7. Driver’s side rear power window
motor
8. Passenger rear door power window
motor
9. Passenger rear window switch
10. Passenger door rear contact switch
11. Passenger door front contact switch
12. Passenger front power window
motor
13. Passenger front window switch

12
E83 Body Electrical
Central Locking
The functions of the Central Locking system is the same as those on the E46. The
GM5RD is the master control unit for the central locking system, and all requests are
processed through the GM5RD.

1. Central Locking, drivers door

w/Hall sensors
2. GM5RD
3. Tailgate Release Button
4. Central Locking, driver’s side
rear door w/Hall sensor
5. Centerlock Button
6. Remote control antenna
7. Tailgate Lock Assembly
8. Passenger door rear, w/Hall
sensor
9. Fuel Filler Flap Locking
10. Passenger door front,, w/Hall
sensor
11. Luggage Compartment Light

Wipers
The wiper system has been modified for use in the E83. The GM5RD controls front
wiper and washer operation as well as headlight washer operation. The rear wiper and
rear washer are controlled by a wiper module with operation requested directly by the
wiper switch.

Wiper Relay
The dual relay is located in the E-Box.

SRA Relay
The SRA (headlight washing system) relay is located in the glove box fuse carrier.

Heated Wiper Nozzles

The heating element of the front washer nozzles are switched by an inline ambient tem-
perature sensor via terminal 15. The current draw of the heating elements is controlled
by a PTC resistor as a function of temperature.

13
E83 Body Electrical
Wipe and Wash Circuit Diagram

1. Wiper Switch 9. W/S Washer Pump

2. Wiper Switch Electronics 10. Headlight Washer Pump
3. DME 11. SRA Relay
4. Instrument Cluster 12. Tailgate Washer Pump
5. RLS 13. Tailgate Wiper Electronics
6. GM5RD 14. Drivers Heated Washer
7. Wiper Motor Reset Contact 15. Passenger Heated Washer
8. Dual Mode Relay 16. Ambient Temperature Switch

Headlight Washer System

The headlight washer system is switched on and off using the windshield washer switch.
The GM5RD switches the headlight washer pump on if terminal 58g is active, every fifth
time the windshield is washed.

Rear Window Wiper

The rear window wiper is controlled by the rear wiper module. The rear wiper module is
the same as used on the E46 sportwagon.

14
E83 Body Electrical
Door Mirrors
There are two door mirror versions fitted to the E83. The low version(standard) door mir-
rors have the following functions:
• Electric mirror adjustment
• Mirror heating

The high version (optional) door mirrors have the following functions:
• Electric mirror adjustment
• Mirror heating
• Mirror folding
All mirror functions for both exterior mirrors are controlled by the GM5RD. The GM5RD
makes all decisions concerning mirror movement and passes instructions to the mirror
electronics (contained in the mirrors) via the LIN bus.
Potentiometers in the mirror electronics monitor position. Current position is sent to the
GM5RD on a cyclical basis, and last mirror position is stored in the GM5RD.
The mirror switch in the SBFA communicates with the GM5RD via the LIN bus.

1. GM5RD
2. Mirror electrics, right
3. Mirror heating, right
4. Mirror vertical motor,
right
5. Mirror horizontal motor,
right
6. Mirror fold motor, right
7. Mirror Pot, right
8. Mirror Pot, right
9. Mirror Fold motor, left
10. Mirror horizontal motor,
left
11. Mirror vertical motor, left
12. Mirror heating, left
13. Mirror electrics, left
14. SBFA

15
E83 Body Electrical
Anti-Theft Alarm System
The DWA anti-theft alarm system is the same as used on the E46. The DWA has been
modified for use on the E83. The alarm is not standard, but a dealer installed option.

Park Distance Control

The PDC Park Distance Control has been taken from the E53. The PDC has been
modified for use on the E83.

Tire Pressure Control System

The E83 is equipped with the RPA tire defect (RDW) indicator as standard.

Exterior Lighting
The exterior lighting function has been taken from the E46. The control unit is the light
switch cluster. The lamps have been modified to the design of the E83. RLS is standard
on all E83’s. Bi-xenon lights with AHL are optional.

Seats
The seat functions have been taken from the E46. The design has been modified for the
E83. The following seat variants are fitted on the E83:
• Mechanical adjustment seats standard on some models
• Electric seat with memory
• Electric sports seat with memory
The memory function can only be used for the driver's seat. Seat heating with lumbar
support is also optional.

Center Console Switch Center (SZM)

The SZM is used from the E53. Opening of the tailgate from the SZM is not possible.
There are two variants:
• SZM Low with DSC, HDC and PDC
• SZM High with DSC, HDC, PDC and SHZ
The High variant may used as a replacement for the Low version.

16
E83 Body Electrical
Displays and Controls
Displays and Controls includes the following individual sections:
• Instrument cluster
• Central Information Display
• Service Interval Indicator

Instrument Cluster
The instrument cluster in the E83 is similar to that of the E85. The following changes
have been made to the E83 cluster:
• The end scale value (maximum speed reading) has been reduced to 250 km/h
• There are no indicator lamps for the EPS or DTC
• A wiper fluid indicator lamp has been added.

17
E83 Body Electrical
Instrument Cluster Circuit Diagram

1. Brake lining wear sensor, LF 8. On-Board Computer button in turn signal stalk
2. DME 9. Reverse Light Switch, Manual Trans only
3. DSC 10. Fuse Box
4. Outside Temperature Sensor 11. Parking brake switch
5. Coolant Level Switch 12. Fuel level sensor 1
6. Not used in the USA 13. Fuel level sensor 2
7. Instrument Cluster 14. Brake lining wear sensor, RR

18
E83 Body Electrical
Indicator and Warning Lamps
The indicator and warning lamps are activated by the processor in the instrument cluster.
Important indicator and warning lamps are activated in the Predrive Check with terminal
15 ''ON''. The indicator lamps and warning symbols are illuminated by permanently
wired-in LEDs (replacement of LEDs not possible).

1. Speedometer 6. Button for display of Time and Service Interval

2. Indicator Warning Lamps 7. Display for Selector lever and program display
3. Tachometer 8. Button for reset of Trip Odometer and Time
4. Coolant Temperature Guage 9. Display for Time, Service Interval, OBC
5. Fuel Guage

Predrive Check
The Predrive Check is a test of important indicator and warning lamps. In the Predrive
Check, these indicator and warning lamps are activated for 2 seconds with terminal 15
''ON''. All the indicator and warning lamps are deactivated at the end of the Predrive
Check.
The following indicator and warning lamps are activated in the Predrive Check:
• Fuel reserve
• Coolant overtemperature
• Fasten seat belt (country-specific)
• Brake-lining wear
• General brake warning light (1 second yellow, 1 second red)
• RDW (1 second yellow, 1 second red)
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E83 Body Electrical
 • Oil pressure/oil level (1 second yellow, 1 second red)
• Gearbox limp-home program
• Washer fluid
• Lamp fault (Check Control)
• Battery charge

LC Display
The LC display is integrated in the speedometer. The LC display indicates the kilometer
reading/mileage and time as well as the on-board computer functions. The service inter-
val indicator is also shown in the LC display.
A tampering dot indicates if there are different vehicle identification numbers in the light
switch cluster and in the instrument cluster.
The LC display is made up of orange-colored segment characters(similar to a dot matrix).
The brightness of the display is determined by the light switch cluster.
The LC display is activated with terminal R ''ON''.

Program and Gear Display

On vehicles fitted with an automatic gearbox, the program and gear display is featured in
a separate LC display. The LC display is located between the speedometer and the rev
counter. The program and gear display is activated with terminal 15 ''ON''.
The LC display for the program and gear display is made up of orange colored segments
(dot matrix). The brightness of the display is determined by the light switch cluster .
The information between the control units for the automatic gearbox and the instrument
cluster is exchanged on the PT-CAN bus. A separate indicator lamp (see warning and
indicator lamps) indicates the gearbox limp-home program in the event of a fault in the
electronic transmission control.

20
E83 Body Electrical
The program and gear display shows letters 1. Program Mode 2. Drive Position
and numbers. The program mode is displayed
on the left and the drive position on the right.

Control Buttons
Two control buttons are located between the 1. Set/Reset 2. Clock Symbol
2 large needle instruments. The left button
(S/R for Set/Reset) is used to reset the trip-
odometer reading, to call up the test functions
and to call up the reset menu for the service
interval indicator.
The right button (clock symbol) is used to set
the time and to switch the service interval indi-
cator (remaining distance/service date or vice
versa).

On-Board Computer
The on-board computer functions are indicated in the bottom line of the LC display. The
software used in the instrument cluster of the E83 is the same as that used in the E85.
All the functions are identical and are described in the vehicle documentation for the E85.
The displays of the on-board computer can be displayed and scrolled through in the
instrument cluster using the button in the turn indicator and High beam switch.

Test Functions
The test functions are used by service mechanics to check the coding. The test functions
are also tools for fault finding without a diagnostic tester. The test functions are only
shown in the LC display of the instrument cluster. The test functions are activated by
pressing the left control button in the instrument cluster (S/R, 5 seconds) with terminal R
or terminal 15 ''ON''.
In addition, the test functions can still be called up by pressing the left control button S/R
for Set/Reset) in the instrument cluster with simultaneous activation of terminal R.

Locking and Unlocking Test Functions

Only the first two test functions are freely accessible. All test functions after the third test
function are locked. Unlocking can only be carried out removed by means of test function
19. In test function 19, the display switches in intervals of 1 second from L_on to L_off
(Lock on and Lock off). The test functions are unlocked or locked by pressing the left
control button (S/R for Set/Reset).
21
E83 Body Electrical
If the left control button (S/R for Set/Reset) in the instrument cluster is pressed while
L_off is displayed, the test functions remain unlocked or are unlocked. The display jumps
to test function 0.
If the left control button (S/R for Set/Reset) in the instrument cluster is pressed while
L_on is displayed, the test functions remain locked or are locked. The test functions can
be locked by means of test function 19.

Diagnosis
There are three possible combinations for replacing the instrument cluster/light switch
cluster:
• Instrument cluster faulty, light switch cluster OK
• Light switch cluster faulty, instrument cluster OK
• Light switch cluster and instrument cluster must be replaced
Simultaneous replacement of the light switch cluster and the instrument cluster must be
avoided. The odometer reading will be lost. In principle it is also possible to carry out a
trial replacement of the instrument cluster/light switch cluster.

CID
The Central Information Display on the E83 is located in the center of the instrument
panel immediately above the ventilation grille. The Central Information Display is identical
in design to the CID fitted in the E85.
The software used in the Central Information Display in the E83 is the same as that used
in the E85. All the functions are identical and are described in the vehicle documentation
for the E85.

22
E83 Body Electrical
SIA IV Service Interval Indicator
The BMW maintenance system SIA IV (service interval indicator) is used in the E83. The
service interval indicator is a system subject to constant development which in its devel-
opment stages has been integrated in various model series such as the E85 and E46.
The service interval indicator appears in the LC display in the instrument cluster's
speedometer. The indicator is shown for five seconds in the LC display after terminal
R ''ON''.

Resetting Service Interval Indicator

Resetting the service interval indicator for the oil service and inspection can only be per-
formed by pressing the left button in the instrument cluster.

23
E83 Body Electrical
Information and Communication
The BMW X3 is a premium vehicle in the SAV (Sports Activity Vehicle) range. The X3
information and communication systems also offer current technology which meets the
highest standards. For example, DVD navigation with color screen, Bluetooth telephone
technology (not at SOP) and audio systems with digital sound improvement are all
offered in the X3.

Radio and CD Changer

The radios in the E83 are identical to those in the E85 except for the color of the front fin-
isher panel. The controls and functional efficiency also correspond to those of the E85
radio systems.
The E83 does come with a BMW Business Radio w/CD as Standard.
Additionally available is the BMW Central Information Display CID radio w/ navigation.
All radios are new generation radios (NG radios). The radios feature a K-bus connection
via which they communicate with other control units. Radios with a cassette deck are no
longer available.
A 6-CD changer is also available for the E83. The CD changer audio signals have a level
of 2.0 V (increased interference voltage distance). New generation radios detect whether
they are communicating with a 0.5 V CD changer (old) or a 2.0 V CD changer (new) and
switch over the input accordingly.

BMW CD Business w/CD

BMW CID Radio w/ Navigation

Model HiFi Audio System Top HiFi Audio System CDC

Business Radio w/CD Standard Optional Optional

CID Radio w/Nav Standard Optional Optional

24
E83 Body Electrical
CD Changer
The CD changer is a standard 6 disc CD
changer as fitted on the E46. The CD changer
is suitable for the new generation radios (2.0 V
audio output).

CDC Location
For the first time in a BMW model, the CD
changer is located in a user friendly position
between the driver's seat and front passenger's
seat in the front armrest (forced connection with
option 473). The snap-in adapter for the mobile
phone is housed in a flap above the CD
changer.

Aerial System
The E83 has up to 6 aerial systems depending on the options installed, not including the
aerial for the remote control services (FBD).
The E83 features the following aerial systems:
• FM 1 - 3 window aerials in the rear window
• FM aerial 4 in the rear spoiler
• AM aerial in the rear spoiler
• Telephone aerial (roof-mounted aerial)
• GPS aerial for the navigation system (roof-mounted aerial)
• SDARS aerial for the digital radio in the USA (roof-mounted aerial)

AM and FM Aerials
The aerial structures for the FM aerials 1 - 3 are integrated in the rear window. The rear
window is made of toughened safety glass (ESG) and is approximately 3.1 mm thick.
The AM aerial is in the rear spoiler. To avoid disturbances in AM reception through the
third brake light in the rear spoiler, there is a suppressor filter in the feed line to the third
brake light.
The power supply to the AM and FM aerial amplifier comes from the radio via terminal
Rad_on.

25
E83 Body Electrical
Aerial Systems Installation Locations

1. AM Aerial
2. FM Aerial 4
3. Amplifier with Diversity Module
4. Roof-mounted Shark Fin, with aerial
for Telephone, Nav and SDARS
5. Not used in USA
6. Heated rear window with FM 1-3
7. Not used in USA

Aerial Amplifier
The aerial amplifier for AM, FM and (FBD) as well as the aerial diversity module are built
into a housing. The module is fitted on the inside of the tailgate.

FM Aerial Diversity
The tuner is connected to the aerial diversity module via an aerial connector (Fakra) and a
coaxial cable. The antenna diversity switches to the next aerial as soon as the signal
quality of the active FM aerial exceeds a defined threshold value. No interruption can be
heard when the diversity module switches over. Evaluation of the signal quality and the
switch over only occur in the aerial diversity module.

1. Heated rear window heating wires

with built in FM Aerials
2. Input: Term 30, Radio On,
FBD Output
3. Input/Output: Coaxial Cable
4. Input: FM 4 Aerial, FBD input, AM
5. Input: FM Aerial 1-3
6. Aerial Amplifier with Diversity

26
E83 Body Electrical
Service Mode

BMW Business CD
The following procedure applies to BMW CD radio and Business CD:
• Switch on the radio
• Press the "m" button within 8 seconds and hold for at least 8 seconds
• The functions listed in the following table are now possible via the service menu
• Switch off the radio to exit service mode

CID Radio
The following procedure applies to BMW CID Radio:
• Switch on the radio
• Press the "SEL" button within 8 seconds and hold for at least 8 seconds
• Switch off the radio to exit service mode

Car and Key Memory

The following functions are stored in car and key memory:
• Sound settings
• Audio source
• The last station accessed is stored

27
E83 Body Electrical
Audio Systems
The various audio systems of the E83 are described in this technical documentation.
The radio systems originate from the E85. The loudspeaker systems are new develop-
ments and are adapted to the acoustic and technical dimension requirements of the E83.
The following audio systems are available for the E83:
• HiFi audio system (Standard)
• Top HiFi audio system

The BMW audio standards which have been applied since the E85 are also being applied
to the E83. They apply to the HiFi and Top HiFi systems with regard to symmetry of the
sound field, sound pressure and linearity of the frequency response.

New Features
New features by comparison with the E85:
• Central woofers for the HiFi and Top HiFi audio systems are fitted. The central bass
principle applies to the systems in the E65/E60.
• The HiFi amplifier in the E83 luggage compartment is a modified version of the HiFi
amplifier from the E85/E46. A 6 channel amplifier is adapted from the 10 channel hifi
amplifier via internal switch changes.
• A fuse is added to the Carver Top HiFi amplifier from the E85 but is otherwise
installed in the E83 without further modifications.

HiFi System

1. Business Radio
2. Front Tweeters
3. Front Broadband
Speakers
4. Central Woofers
5. Rear Broadband
Speakers
6. HiFi Amplifier

28
E83 Body Electrical
HiFi Schematic

1. Instrument Cluster 5. Front Broadband Speakers

2. Business CD Radio 6. Central Woofers
3. Aerials for AM/FM and diversity module 7. Rear Broadband Speakers
4. Front Tweeters 8. HiFi Amplifier, 6 channel

29
E83 Body Electrical
The HiFi audio system features a 6 channel analogue amplifier that is connected directly
to the 4 speaker outputs of the radio. The loudspeakers are connected to the 6 HiFi
amplifier out channels. The tweeters are protected from overload by capacitors in the
supply lead and connected in parallel to the broadband speakers.
All sound controlling functions such as volume, bass, treble, fader, and GAL are per-
formed in the radio.

HiFi Amplifier
The 6 channel HiFi amplifier in the luggage
compartment of the E83 is a modified version
of the 10 channel HiFi amplifier from the
E85/E46. Four channels are for the door loud-
speakers (broad-band loudspeaker or broad-
band speaker with additional tweeter) and 2
channels are for the central woofers.
The housing is constructed in the same way as
the 10 channel HiFi amplifier in the E85/E46.
The HiFi amplifier has on output of 4 x 25 watts
for the mid-range and high-ranges and 2 x 40
watts for the low frequency.

Top HiFi System

1. Business Radio
2. Front Tweeters
3. Front Broadband
Speakers
4. Central Woofers
5. Rear Tweeters
6. Rear Broadband
Speakers
7. Carver Top HiFi
Amplifier

30
E83 Body Electrical
Top HiFi Schematic

1. Instrument Cluster 6. Central Woofers

2. BMW Business CD Radio 7. Rear Tweeters
3. Aerials AM/FM and diversity module 8. Rear Broadband Speakers
4. Front Tweeters 9. Carver Top HiFi Amplifier
5. Front Broadband speakers
31
E83 Body Electrical
Top HiFi Audio System
The Top HiFi audio system features a 10 channel amplifier with digital signal processor
technology for sound control. The Top HiFi amplifier is controlled via the two radio ana-
logue audio signals.
The Top HiFi amplifier features a digital input for the CD changer. The digital input is only
used for the BMW Business CD radio and CD changer combination. The 10 loudspeak-
ers are directly connected to the 10 output channels of the Top HiFi amplifier. The active
frequency gates for adaptation of the loudspeakers are built into the amplifier.
Depending on the radio, various functions can be called up. Sound control functions such
as volume, bass, treble, fader, GAL, spatial sound simulation etc. are formed in the Top
HiFi amplifier. The 7 band graphic equalizer can only be used in connection with the CID
radio.
Top HiFi Amplifier
A fuse is added to the familiar Carver Top HiFi
amplifier from the E85 but is otherwise installed
in the E83 without further modifications.
However, special Carver woofers with increased
cone excursion are used in the E83 that are used
in the the E85. The space available in the E83
and the resonance volume in the side sill enables
the use of the central bass principle.
The central woofers in the Top HiFi audio system 1. 46-pin connector
are simply adapted to the increased voltage level 2. Digital input for CDC
of the bass end levels (8 . impedance). The 3. Fuse
amplifier delivers 6 x 20 watts,
2 x 40 watts and 2 x 100 watts.

SPDIF
The digital connection between the Top HiFi
amplifier and the CD changer is an SPDIF connec-
tion. SPDIF stands for Sony Philips Digital Interface
and is a data transfer standard for digital audio data.
The data can be transferred optically via fibre-optic
cables or via coaxial cables depending on the unit.
Advantage: the digital data is read by the CD and
transferred between the units with the highest pos-
sible quality, as no digital/analogue conversion is 1. Top HiFi Amplifier (HiFi Amplifier also)
necessary. The Top HiFi amplifier also no longer 2. Navigation
has to carry out analogue/digital conversion. The 3. Not used in USA
digital data can therefore be processed directly 4. SDARS
from the DSP (Digital Sound Processor).

32
E83 Body Electrical
Telephone System
The Everest platform for the telephone and telematics functions are used in the US ver-
sion of the E83. For the American market, three different versions are offered:
• TCU only with telematics function emergency call (E-Call) and breakdown call (B-
Call). (Optional w/Premium Package
• TCU with telematic function emergency call and enabling by provider.
• TCU with telematics and telephone functions via hands-free unit or mobile phone
(after retrofitting a telephone).

Telematic Control Unit TCU

The Telematic Control Unit TCU is optional equipment in US vehicles. This means that
an emergency call can always be made(if the car is equipped with the TCU), also if the
customer has not (yet) retrofitted a telephone.
The range of functions of the US version is as follows:
• TCU is always fitted in order to ensure the emergency call can be made even if no
telephone is present
• Dual-band 800 MHz and 1900 MHz
• Combined transmit/receive module NAD (Network Access Device) for analog AMPS
(American Mobile Phone Standard) for telephone calls and digital CDMA (Code
Division Multiplex Algorithm) for telematics functions
• Eject box with charging unit for Motorola Phoenix V60
• Telematics functions (E/B call)
• GPS receiver for localization

Principle of Operation
In the US version, the Telematic Control Unit has an NAD (Network Access Device) that
works in the AMPS/CDMA standard with the frequencies 800/1900 MHz. The TCU fea-
tures a hands-free system with full-duplex transmission. This makes it possible to speak
and listen simultaneously. The position of the vehicle is determined by the TCU by means
of a built-in GPS receiver. In the event of a crash, the TCU sends an SMS with this loca-
tion data to the provider. Furthermore, the TCU has an interface for the connection of an
emergency call button (E/B Call). The emergency call button is a dual function switch
with two keys: one for the emergency call and one for the breakdown call. The emer-
gency call button is standard equipment.

33
E83 Body Electrical
Telephone Overview

1. MFL w/ Telephone Button 7. GPS Aerial

2. CID 8. Hands-free Microphone
3. Speaker 9. Emergency Call and Assistance Buttons
4. Motorola Mobile Phone 10. CID control panel (Radio)
5. Compensator 11. TCU
6. Phone Aerial

34
E83 Body Electrical
Telephone Circuit Diagram

1. Hands-free Microphone 5. Eject Box w/Mobile Phone 9. GPS Aerial

2. BMW Business CD Radio 6. Phone Aerial 10. Call Buttons
3. MFL w/Telephone Button 7. Compensator
4. Speaker 8. TCU
35
E83 Body Electrical
Compensator
The compensator is connected in the aerial cable between the telephone and the roof
aerial. It balances out the losses of the aerial cable. The compensator is fitted in the lug-
gage compartment on the separating wall to the left of the TCU.

GPS Aerial
The GPS aerial permanently receives data regarding the current latitude and longitude
from the satellites of the Global Positioning System, GPS. This data is transferred to the
GPS receiver in the TCU, which uses it to determine each position of the vehicle. The
GPS aerial is integrated in the roof aerial.

Telephone Aerial
The telephone aerial is part of the shark fin antenna.

1. SDARS
2. GPS
3. Telephone

36
E83 Body Electrical
Navigation
One navigation system is available optionally in the E83. The Professional Navigation with
CID and Business Radio with CD( MK-3 Nav with widescreen monitor), is the only system
available.

1. Instrument Cluster
2. CID
3. CID Control Panel (Radio)
4. DVD Navigation Computer
5. GPS Aerial
6. AM/FM Aerials with amplifier
and diversity

37
E83 Body Electrical
 Workshop Exercise - E83 Component Location

38
E83 Body Electrical
 Item Component Name Acronym Location
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21

E83 Body Electrical

39
40
E83 Body Electrical
 Item Component Name Acronym Location
1
2
3
4
5

E83 Body Electrical

41
42
E83 Body Electrical
 Item Component Name Acronym Location
1
2
3
4
5
6
7
8

E83 Body Electrical

43
44
E83 Body Electrical
 Item Component Name Acronym Location
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16

E83 Body Electrical

45
 Active Headlight Control
AHL Light Switch Panel
Unit
Antenna Amplifier and Main Fuse and Power
Diversity Distribution Box
Auto Recirc Air Control Multi Drive Sunroof
AUC MDS
Sensor Control Unit
Battery MRS Multiple Restraint System

Bluetooth Antenna NG Tilt Sensor

CDC Compact Disc Changer Oil Level Sensor

CID Central Information Display PDC Park Distance Control

DME Digital Motor Electronics Radio

Door Pressure Sensor
RLS Rain Light Sensor
Right
Satellite Crash Sensor
Door Pressure Sensor Left SBSL
B-Pillar Left
Satellite Crash Sensor
DSC Dynamic Stability Control SBSR
B-Pillar Right
DVD Navigation Computer SDARS Satellite Radio Receiver

DXC Dynamic X Drive Control SES Voice Recognition

Electronic Transmission
EGS SINE Emergency Power Sensor
Control
Eject Box Solar Sensor
Electronic Vehicle
EWS SVT Servotronic Control Unit
Immobilization
GM5RD General Module TCU Telematics Control Unit
GPS Antenna, also
GPS Up Front Sensor
Telephone and SDARS
HiFi Amplifier, also Top HiFi
HiFi Up Front Sensor
Amplifier
KOMBI Instrument Cluster USIS Ultrasonic Car Alarm

LSZ Light Switch Cluster

46
E83 Body Electrical
 E83 Workshop Exercise A/C
Customer has just picked up their new X3. Almost immediately they return with a com-
plaint of no fan in the car.

1. Perform Short Test.

2. List the pertinent faults for this complaint.

3. From what source does the affected control module receive its B+?
4. Are those fuses good?
5. Explain the operation of K19 and how it affects the power supply.

6. Check for power at the affected control module.

What is the voltage on the pin(s) that supply B+?
7. What is the next most likely source of the problem?
8. Where is K19?
9. Could you substitute K6304 for K19?
10. List the other components similar to K19 and their location.

11. What is the results of Test Function 7.2 of the Instrument Cluster?

47
E83 Body Electrical