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Ford Galaxy / Ford S-MAX. Manual - part 801

3. 3. Resolve any obvious causes or concerns found during the visual inspection before

carrying out any further tests.

4. 4. If the cause of the concern cannot be found by visual inspection, continue with the

symptom chart.

Symptom chart

Bulb(s)
Electrical connector(s)
Wiring loom
Light switch

Symptom

Possible Sources

Action

The daytime running lamps are
inoperative

Fuse(s)
Circuit(s)
Light switch
Central

Junction Box
(CJB)

Generic

electronic
module (GEM)

*
*
*
*

REFER to:

Headlamps

(417-01

Exterior Lighting, Diagnosis and
Testing).

The parking, rear and/or license
lamps are inoperative with the
daytime running lamps ON.

Circuit(s)
Central

Junction Box
(CJB)

Generic

electronic
module (GEM)

*
*

REFER to:

Parking, Rear and License

Plate Lamps

(417-01 Exterior

Lighting, Diagnosis and Testing).

Module Communications Network -
Communications Network

S-MAX/Galaxy 2006.5 (02/2006-)

Description and Operation

Description

MM CAN bus (Infotainment)

MS CAN bus

LIN bus (directly to the GEM)

HS CAN bus

Terminating resistors

DLC

Electronic instrument cluster

Audio unit

Item

Part Number

CD changer

Navigation system module not communicating with the diagnostic
tester - vehicles equipped with DVD navigation system with touch

screen

Navigation system display not communicating with the diagnostic
tester - vehicles equipped with DVD navigation system with touch

screen

Handsfree module / Bluetooth module / voice activation module

Rear seat entertainment system module

Door module on the rear passenger side (via LIN bus)

Door module on the front passenger side

Door module on the rear driver's side (via LIN bus)

Door module on the front driver's side

Switch unit on the front driver's side (via LIN bus)

Restraints control module

Electronic automatic temperature control (EATC) module

Rear A/C module

Parking aid module

Driver seat module

Fuel fired booster heater /programmable fuel fired booster heater

Trailer Module

Receiver module for the remote control / tire pressure monitoring (via
LIN bus)

Generic electronics module (GEM)

Steering wheel module (via LIN bus and HS CAN bus)

Light switch unit (via LIN bus)

Battery-buffered signal horn – anti-theft alarm system (BBS) (via LIN
bus)

Interior monitoring sensors (via LIN bus)

Wiper motor (front left) (via LIN bus)

Light/rain sensor (via LIN bus)

Shock absorber control module

Collision warning radar unit (via private CAN bus)

Collision warning module

Gear lever (automatic transmission only) (via LIN bus)

Transmission Control Module

Gas discharge headlamp, right (via LIN bus / PWM)

Gas discharge headlamp, left (via LIN bus / PWM)

Gas discharge headlamp module

ABS module or ESP module

Alternator (via LIN bus)

Powertrain control module (PCM)

Yaw rate / lateral acceleration sensor

Electric handbrake module

Electro-hydraulic power-assisted steering module

Steering wheel rotation sensor

Network components

Dependent on the vehicle accessories version, two data bus systems are used:

Controller Area Network (CAN) bus
Local Interconnect Network (LIN) bus

Due to the increased number of modules and the resulting continued increase in data
transfer, three different CAN bus systems are used. Essentially, they only differ in terms of
their data transmission rates and application areas. In order to be able to distinguish
between the individual CAN bus systems, the CAN bus system with the higher data transfer
rate is referred to as the high-speed (HS) CAN bus, the CAN bus system(s) with the lower
data transfer rate as the mid-speed (MS) CAN bus or multimedia (MM) CAN bus. The latter
operate at a slower speed and are used primarily for communications in the areas of
comfort electronics and multimedia systems. Two interfaces (gateways) are used in order to
exchange data between the HS CAN bus, MS CAN bus and the MM CAN bus. The provide the
connection between the three CAN databus systems and are installed in the GEM and in the
electronic instrument cluster.

The number of modules which are connected to the three databus systems depends on the
equipment level of the vehicle.

Controller area network (CAN)

General

In the past, a separate cable was needed for every command and every message. The use
of networks has enabled an increase in functionality without additional cables.

The demand for greater functionality in vehicles, both due to legal requirements and in
order to meet customer demands, results in increasing complexity of vehicle systems.

The Controller Area Network (CAN) was developed as part of the effort to achieve greater
flexibility of the electrical systems. It allows a large number of different control commands
and messages to be sent and received on the same cable system.

The number of control commands and messages which can be processed by a network
depends on factors like the data transfer rate and the length of the messages. The
SMAX/Galaxy network, which is based on a Controller Area Network (CAN), is capable of
transferring over 500 different signals and approx. 100 messages. These messages are also
described as transmission blocks and may contain several signals.

Advantages of a network

Easy integration of additional functions and accessories

As the control modules in the network are already connected to each other and can easily
accept further information, only the following steps are necessary:

Connection of the sensors to the nearest control module
Connection of the component which is to be actuated to the nearest control module
Software-based adaptation of the module configuration

This means that the overall length of cabling and the number of components in a vehicle are
reduced compared to before.

One example of this is the integration of the speed control system.

Before the introduction of the network, control modules, switches, vacuum pumps, vacuum
servos, hoses and wiring harnesses were needed for this system.

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