Volkswagen Passat 2006 Manual

Service Training
Self-study Programme 340
The Passat 2006
Electrical System
Design and Function

2
The self-study programme shows the design and function
of new developments.
The contents will not be updated.
For current testing, adjustment and repair instructions,
refer to the relevant
service literature.
The Passat 2006 features further innovations in
the area of vehicle electrics and electronics.
The developers have paid particular attention to
comfort in this car.
One example is the entry and start authorisation
switch. For the first time, you do not have to turn
the ignition key to start the engine.
This self-study programme should help you get to
know the electrical system in the Passat 2006
and become familiar with the new features.
NEW Important
Note
S340_072

3
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Data Bus Systems
Control Units for Powertrain CAN Data Bus . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Control Units for Convenience CAN Data Bus . . . . . . . . . . . . . . . . . . . . . . . 10
Control Units for Infotainment CAN Data Bus
Combi and Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Sub-bus Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Onboard Power Supply
Electronics Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Relay Carriers and Fuse Boxes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Onboard Power Supply Control Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Exterior lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Data Bus Diagnostic Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Control Unit with Display in Dash Panel Insert . . . . . . . . . . . . . . . . . . . . . . . 34
Convenience System Central Control Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Immobilizer IV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Start-Stop System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Electronic Steering Column Lock Control Unit . . . . . . . . . . . . . . . . . . . . . . . 46
Convenience and Safety Electronics
Corning Light System (Advanced Frontlighting System) . . . . . . . . . . . . . . . . 48
Customisation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Parking Aid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Test Yourself. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Contents

4
Locations
The Passat 2006 onboard power supply is
decentralised and is therefore similar to the
Golf 2004 system. The Passat also has a fuse box
on the right-hand side of the dash panel due to
the large number of electrical consumers.
The distribution of the fuse boxes and relays
among different locations allows fast and precise
fault diagnosis.
Electronics box,
on left of engine compartment
Back-up fuse box,
on left of engine compartment
Introduction
Fuse Boxes and Relay Locations in the Onboard Power Supply
Fuse box,
in right-hand side of
dash panel

5
Relay carrier,
on left under dash panel,
above onboard power supply
control unit
Fuse box,
on left in dash panel
Relay carrier on onboard power
supply control unit,
on left under dash panel
S340_001

6
Introduction
Networking Concept
The data bus diagnostic interface J533 forms the
interface for communication among the
following data bus systems:
-PowertrainCAN data bus
-ConvenienceCAN data bus
-Infotainment CAN data bus
-CombiCAN data bus
-DiagnosticsCAN data bus
The following data bus systems are connected
downstream of a CAN data bus system as a
sub-bus system:
-LINdata bus
-CANdata bus, electromechanical
parking brake
-SensorCAN data bus
-Corneringlights CAN data bus
-Serialdata bus
Overview of networked control units
Powertrain
CAN data bus
Convenience
CAN data bus
Infotainment
CAN data bus
Cornering lights
CAN data bus
Electromechanical parking brake
CAN data bus
LIN data bus
Sensor
CAN data bus
Combi CAN
data bus
Diagnostics
CAN data bus
CAN data bus
cable
Communications line
LIN data bus
cable
Serial data bus
cable
S340_003
J428
J503 / R
J412
J525
J364
J738
T16
J533
J623
J745
J583
J285
J345
J519
J255
J386
J387
J136
J388
J389
J521
J667
J668
J788

7
E221 Operating unit in steering wheel
E415 Entry and start authorisation switch
G85 Steering angle sender
G273 Interior monitoring sensor
G384 Vehicle inclination sender
G397 Rain and light detector sensor
G419 ESP sensor unit
H12 Alarm horn
J104 ABS control unit
J136 Seat and steering column adjustment
control unit with memory
J217 Automatic gearbox control unit
J234 Airbag control unit
J255 Climatronic control unit
J285 Control unit with display in dash panel insert
J345 Trailer detector control unit
J364 Auxiliary heater control unit
J386 Driver door control unit
J387 Front passenger door control unit
J388 Rear left door control unit
J389 Rear right door control unit
J393 Convenience system central control unit
J400 Wiper motor control unit
J412 Mobile telephone operating electronics control unit
J428 Adaptive cruise control unit
J446 Parking aid control unit
J492 Four-wheel drive control unit
J500 Power steering control unit
J503 Control unit with display for radio and
navigation
J519 Onboard power supply control unit
J521 Front passenger seat position with memory
control unit
J525 Digital sound package control unit
J527 Steering column electronics control unit
J533 Data bus diagnostic interface
J540 Electromechanical parking brake control unit
J583 NOx sensor control unit
J587 Selector lever sensors control unit
J604 Auxiliary air heater control unit
J605 Boot lid control unit
J623 Engine control unit
J667 Power output module for left headlight
J668 Power output module for right headlight
J738 Telephone controls control unit
J743 Mechatronics for direct shift gearbox
J745 Cornering light and headlight range control unit
J764 Electronic steering column lock control unit
J788 Powertrain CAN bus isolation relay
RRadio
T16 Diagnosis connection 16-pin connector
G419
J104
J500
J217
J743
J492
J540
J587
J234
E221
J446
G397
J604
J605
G85
E415 J527
J400
J393
G384 J764
H12
G273
S340_002

8
Data Bus Systems
Control units and locations
The adjacent diagram shows the control units
that are involved in the powertrain CAN data
bus communication as well as their locations.
The data transfer speed is 500kbit/s. The transfer
occurs via the CAN high cable and the CAN low
cable. The CAN cables are twisted together for
secure data transfer.
The powertrain CAN data bus is not suitable for
use with a single cable – data transfer would not
be possible if one CAN cable fails.
Control Units for Powertrain CAN Data Bus
Headlight range control,
control unit J431,
on right-hand side of
glove compartment
ABS control unit J104,
on the bulkhead,
on right inside engine compartment
Adaptive cruise control unit J428 *,
behind the brand badge
Engine control unit J623,
under the plenum chamber cover
Due to new terminology for the names
of components, some terms may be
different to those used in other
self-study programmes.
* To be used at a later point in time.

9
Data bus diagnostic interface J533,
on left under dash panel
S340_004
Steering column electronics control unit J527,
under the steering column switch
Four-wheel drive control unit J492 *,
on the Haldex coupling, in front of the rear axle
Airbag control unit,
under centre console at front
Selector lever sensors control unit J587,
under centre console at front
Power steering control unit J500,
on the steering rack near the
bulkhead
Automatic gearbox control unit J217,
in front left wheel housing

10
Data Bus Systems
Control units and locations
The adjacent diagram shows the control units
that are involved in the convenience CAN data
bus communication as well as their locations.
The data transfer speed is 100 kbit/s. The transfer
occurs via the CAN high cable and the CAN low
cable. The CAN cables are twisted together for
secure data transfer.
The convenience CAN data bus is suitable for
use with a single cable – data transfer would still
be possible if one CAN cable fails.
Control Units for Convenience CAN Data Bus
Convenience system central control unit J393,
on right under dash panel
Climatronic control unit J255,
in middle of dash panel
Door control units J386, J387, J388, J389,
in the doors
Front passenger seat
position with memory
J521,
under passenger seat

11
S340_005
Parking aid control unit J446,
in the side section at rear right
Trailer detector control unit J345,
in the side section at rear left
Multifunction steering wheel control unit J453,
in the steering wheel
Steering column electronics control unit J527,
in the steering column
Seat and steering column adjustment control unit
with memory J136,
under driver’s seat
Onboard power supply control unit J519,
on relay carrier under the dash panel

12
Data Bus Systems
Control units and locations
The adjacent diagram shows the control units
that are involved in the infotainment and combi
CAN data bus communication as well as their
locations.
Infotainment CAN data bus
The data transfer speed is 100 kbit/s. The transfer
occurs via the CAN high cable and the CAN low
cable. The CAN cables are twisted together for
secure data transfer.
The infotainment CAN data bus is suitable for
use with a single cable – data transfer would still
be possible if one CAN cable fails.
Combi and diagnosis CAN data bus
The data transfer speed is 500 kbit/s. The
transfer occurs via the CAN high cable and the
CAN low cable. The CAN cables are twisted
together for
secure data transfer.
The combi and diagnosis CAN data bus systems
are not suitable for use with a single cable – data
transfer would not be possible
if one CAN cable fails.
Control Units for Infotainment CAN Data Bus
Combi and Diagnosis
Auxiliary heater control unit J364,
in right wheel housing
CD changer R41,
in glove compartment

13
S340_007
Mobile telephone operating electronics
control unit J412,
under passenger seat
Control unit with display in dash panel
insert J285
Data bus diagnostic interface J533,
in footwell on driver’s side,
near pedals
Diagnosis connector T16
on left under dash panel, driver’s side
Digital sound package control unit J525,
under driver’s seat
Control unit with display for radio
and navigation J503,
in the dash panel

14
Data Bus Systems
Sub-bus Systems
LIN data bus
The Local Interconnect Network is a local system
that transfers data via a single-wire connection
at a data transfer rate of 1 - 20 kbit/s.
The transfer rate is stored in the master control
unit software. The data exchange occurs
between a master control unit and up to 16 slave
control units. The communication between the
individual subscribers is initiated exclusively by
the master control unit that can also
communicate on the CAN data bus.
Control Units for LIN Data Bus
J519
J400
G397
J393 G384 G273 H12
Legend
G273 Interior monitoring sensor
G384 Vehicle inclination sender
G397 Rain and light sensor
H12 Alarm horn
J393 Convenience system central control unit
J400 Wiper motor control unit
J519 Onboard power supply control unit
J533 Data bus diagnostic interface
J533
S340_062

15
The data transfer speed of the electromechanical
parking brake CAN data bus is 500 kbit/s.
The transfer occurs via the CAN high cable and
the CAN low cable. The CAN cables are twisted
together for secure data transfer.
The powertrain CAN data bus is not suitable for
use with a single cable – data transfer would not
be possible if one CAN cable fails.
Control units for electromechanical parking brake CAN data bus
Electromechanical CAN data bus
Legend
J104 ABS control unit
J533 Data bus diagnostic interface
J540 Control unit for electromechanical
parking brake
J533
J104
J540
S340_063
Additional CAN data bus systems are
necessary due to the high
requirements (data rate and quantity).

16
The data transfer speed of the cornering light
CAN data bus is 500 kbit/s. The transfer occurs
via the CAN high cable and the CAN low cable.
The CAN cables are twisted together for secure
data transfer.
The cornering light CAN data bus is not suitable
for use with a single cable – data transfer would
not be possible if one CAN cable fails.
Data Bus Systems
Cornering Lights (Advanced Frontlighting System) CAN Data Bus
Control units for cornering light CAN data bus
Legend
J533 Data bus diagnostic interface
J667 Power output module for left headlight
J668 Power output module for right headlight
J745 Cornering light and headlight
range control unit
J533
J745
J668
J667
S340_064

17
Legend
J533 Data bus diagnostic interface
J583 NOx sensor control unit
J623 Engine control unit
Legend
J533 Data bus diagnostic interface
J393 Convenience system central control unit
J764 Electronic steering column lock control unit
J533
J623J583
S340_066
S340_065
J533
J393
J764
Sensor CAN data bus
The data transfer for the sensor CAN data bus is the same as the cornering light CAN data bus and
transfers the data between the engine control unit and the NOx sensor control unit.
Serial data bus
The serial data bus transfers the data via a single-wire connection at 9800 kbit/s between the electronic
steering column lock control unit and the convenience system central control unit. Using the serial data
bus system increases theft protection compared with use of the LIN data bus system.

18
Onboard Power Supply
Electronics Box
Location
The electronics box is mounted at the front right
in the engine compartment.
Description
All fuses and relays for protection and control of
the electrical components in the engine
compartment are accommodated in the
electronics box.
There is therefore no cable running into the
interior and back.
Troubleshooting is made easier, the protection is
configured better to the consumer and multiple
assignment of fuses is avoided to a great extent.
Please refer to the ELSA electronic service information system for the current assignment
with fuses and relays in the electronics box.
S340_010

19
Electronics Box
The electronics box also contains the following
relay in addition to the fuses for the components
in the engine compartment:
-Voltagesupply relay
terminal 30 J317
Back-up fuse box
The back-up fuse box contains the fuses for
-thealternator,
-theelectromechanical power steering,
-theradiator fan,
-theABScontrol unit.
S340_011
S340_012

20
Onboard Power Supply
Locations
The relay carrier and the onboard power supply
control unit are under the left-hand side of the
dash panel.
Relay carrier
The relays connected to the relay carrier depend
on the vehicle version and the equipment.
On vehicles with heated seats, the circuit
breakers for the heating elements (thermal fuses)
are also mounted on the relay carrier.
Relay carrier on onboard power supply
control unit
There is an additional relay carrier on the
onboard power supply control unit.
S340_008
S340_009
Relay Carriers and Fuse Boxes