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Functional description SRC
There are two different types of sunroofs: spoiler type and tilt/slide type. Spoiler type is a
combination of sunroof and sunshade. Therefor two control units are necessary: SRC1 for
the sunshade, SRC2 for the sunroof.
Motion requests
Sunroof motion may be initiated by the following components:
Sunroof switch and Tilt/Vent switch [only tilt/slide type]
remote request
o other vehicle systems (e.g. Key Fob, Rain Sense, etc.)
o service tool
Sunshade movement can be initiated by:
Sunshade switch
remote request
o other vehicle systems (e.g. Key Fob, Rain Sense, etc.)
o service tool
Remote requests, which are initiated by other vehicle systems, may be cancelled or
overridden by the local switches. If a remote request was initiated by a service tool it shall
not be affected by the local switches.
The local switches shall take precedence over all sunroof remote requests in the RUN,
ACCESSORY and RAP power modes. They shall also take precedence over all sunroof
remote requests when Extended Window Power is ‘active’. Furthermore, the switches shall be
able to stop movement requested remotely by another vehicle system in the OFF power
mode when Extended Window Power is ‘inactive’. However, the local switches shall not be
able to cause movement in this situation.
A “normal open” request may only be initiated if the sunroof is in neutral position (closed).
There are two modes of opening the sunroof: normal and express mode. Via “Sunroof open”
the sunroof starts to move underneath the roofing. It will stop if the button is released. This
is normal mode. Express mode is entered by pushing the “Sunroof express open” switch. The
sunroof will start to open and ceases when it reaches the “Fully Open Position”.
State order of the sunroof in tilt/slide type is the following:
Vent position ÅÆ Close state ÅÆ Open state
Spoiler type
Sunroof open movement
In spoiler type there is only one switch for moving the sunroof. It controls both vent position
and open state. Its design is the following:
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Sunroof switch
Express Open
Open
Neutral
Close
Express Close
Moving the sunroof into vent position may be initiated by pushing the “Sunroof open”
button for no longer than 500ms. The sunroof will cease if vent position is reached.
From vent position the sunroof can be opened further on into open position. The sunroof will
move above the roof. This action may be initiated by pushing “Sunroof open” for longer
than 500ms or going into express mode via “Sunroof express open”. In express mode the
sunroof will completely open even if the button is released, normal mode will stop the
sunroof on button release.
State order of the sunroof in spoiler type is the following:
Close state ÅÆ Vent position ÅÆ Open state
Sunroof close movement
If the sunroof is in vent position, the closing request may be initiated by pushing the
“Sunroof close” button. Sunroof will go on moving until it is fully closed.
If the sunroof is in open state, closing may be initiated by pushing the “Sunroof close”
button. Sunroof ceases on button release.
Closing of the sunroof in open state may also be initiated by pushing the “Sunroof express
close” button. Within this procedure the sunroof moves until it is in close position, even if the
button is released. The sunroof doesn’s stop in vent position.
In express closing mode and manual closing mode within power mode OFF and ACC,
movement is automatically stopped if the blockage detection recognizes a certain force
against the movement.
Sunshade movement
The second switch in spoiler type is used for sunshade movement.
Sunshade switch
Express Open
Open
Neutral
Close
Express Close
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There are two different ways the sunshade may open. In Normal Open Procedure, the
sunroof moves as long as the “open” button is pressed. If it is released, the sunroof ceases.
If “express open” is pressed, the sunshade doesn’t stop on button release. It moves on until
the sunshade is completely open. It can be stopped by pressing the “Sunshade close” or
“Sunshade express close” button or via “Sunshade open” switch after the sunshade is past
the neutral position.
For closing the sunshade there are also two procedures. These are Normal and Express
Procedure again.
In both opening and closing mode, the blockage detection is active. The sunshade will
automatically cease and go on with an Open movement, if a resistance is detected. As
specified in sunroof closing movement section, the obstacle detection is only active in
normal mode, while power mode is OFF or ACC and in express mode.
Sunroof Auto Close
If the sunroof is in a position nearby the fully closed position (smaller than 4mm), it shall be
closed completely regardless of switch states or remote requests. This feature is available in
every type.
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Connectors and pin assignment SRC
X1
1
A40
BATT
2.5mm2
2
A50
GND
2.5mm2
3
5
5027
Sunroof Switch Low
Reference
Linear Interconnect
Network Bus 1
Sunroof Switch Data (1)
0.5mm2
4
128 /
3030
6132
A50
N.c
N.C
SEL2 - Connect to GND
6
7
8
9
0.5mm2
0.5mm2
0.5mm2
SEL2 (not connected)
193
BRASS/TIN
PLATING
BRASS/TIN
PLATING
BRASS/TIN
PLATING
BRASS/TIN
PLATING
BRASS/TIN
PLATING
BRASS/TIN
PLATING
BRASS/TIN
PLATING
Pigtail Wire Color
Pigtail Wire Gauge
Terminal Plating
Shield Group
Twist Group & Rate
Max. Wire
Resistance
Circuit Description
Minimum Wire
Gauge
Circuit #
Cavity
SUNROOF - LID
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A50
GND
2.5mm2
3
5307
0.5mm2
4
6132
Front Sunshade Switch Low
Reference
Linear Interconnect Network Bus 1
5
3032
Front Sunshade Switch Signal (SW1 - SUNROOF/SUNSHADE)
N.C
N.C
SEL1 (not connected)
0.5mm2
SEL2 - Connect to GND
0.5mm2
6
7
8
9
A50
0.5mm2
194
BRASS/TIN
PLATING
BRASS/TIN
PLATING
Pigtail Wire Color
2
BRASS/TIN
PLATING
BRASS/TIN
PLATING
BRASS/TIN
PLATING
BRASS/TIN
PLATING
BRASS/TIN
PLATING
Pigtail Wire Gauge
2.5mm2
Terminal Plating
BATT
Shield Group
A40
Twist Group & Rate
Circuit #
1
Circuit Description
Max. Wire
Resistance
Cavity
Minimum Wire
Gauge
SUNROOF - SUNSHADE
Page 196
TPMS (Tire Pressure Monitoring System) / ALM (Auto Learn Module)
The Tire Pressure Monitoring System consists of two modules (RFA and ALM), four tire
pressure sensors and an application software which is located in the BCM. The system
measures tire pressure and gives feedback to the driver.
Block diagram TPMS
TPM Sensors
TPM Sensor
frame via RF
TPM Sensor
frame via RF
IPC/ DIC
ALM (Auto
Learn Module)
Sensor
locations and
ID´s via LIN2
BCM
TPMS
Application SW
Vehicle speed,
transmission
info via LIN2
RFA
TPM Sensor
frame
(pressure,
temperature,
sensor ID´s)
Calibration Files
Functional description TPMS
Getting the tire pressure information
The sensors, which are located in the tires, send RF frames that contain an identifier,
pressure and temperature.
RFA receives the sensor frame. It has no further intelligence, but simply transfers the sensor
data to TPMS application software in the BCM. The application software processes the
TPMS algorithm according to specification. The position of the sending tire is determined by
the ALM. If the TPMS application software got every information needed it finally sends the
information to the Instrument Panel Cluster IPC and (if equipped) to the Driver Information
Center DIC.
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Auto learn functionality
In addition to the sensors’ RF signal, ALM also receives the left/right information sent by the
sensors. This information is determined by the rotating direction of the tire.
The ALM decides if the tire which is sending information is located at the front or rear axle.
It can determine that information by the sensor’s signal strength. ALM is mounted in the
rear of the vehicle in order to gain the difference in signal strength between front axle and
rear axle sensors.
The combination of the front/rear and left/right information gives the ALM the opportunity
to assign a sensor’s identifier with its position. This information is sent to the BCM via LIN
bus.
ALM is able to relearn the sensor location automatically on ignition on if the vehicle has
been stationary for approx. 20 minutes. This process takes about 3-5 minutes of driving, 9
minutes worst case.
IPC / DIC display
The IPC shows a telltale. The possible states of the telltale are:
Off – everything is ok
On – one or more tires is/are significantly under-inflated
Steady active after 60-90 seconds of blinking – System failure
DIC gives information about the actual pressure value of each tire.
On any error it gives warnings in words. That may be:
Check Left/Right Front/Rear Tire Pressure (small pressure loss)
Left/Right Front/Rear Tire Pressure High / Low
Pressure Imbalance Front/Rear (pressure delta between left
and right tire on one axle reached a certain value)
Service Tire Monitor System (system failure)
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Connectors and pin assignment ALM
Signal Ground
Run/Crank Ignition 1 Voltage
Linear Interconnect Network
Bus 2
SPARE
Tin over Nickel
Tin over Nickel
Tin over Nickel
0,64
10
Tin over Nickel
Pigtail Wire Color
Ω
10
10
10
Shield Group
mm²
0,64
0,64
0,64
Pigtail Wire Gauge
Terminal Plating
Twist Group & Rate
Max. Wire
Resistance
4
A51
A39
6133
Circuit Description
Minimum Wire
Gauge
1
2
3
Circuit #
Cavity
X1
mm²
For further information concerning RFA see corresponding functional description in chapter
8.9.
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Other Components
IEC (Instrument Panel Electrical Center)
The Instrument Panel Electrical Center is located beneath the I/P stack. It provides relays
and fuses for the I/P. IEC is part of the wiring harness.
Relays:
Relay K1
Relay K3
Fuses:
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F4-10A F4A-7,5A F2-20A
F108-20A F18-20A
F3-7,5A
FE2-30A
F6-5A
F1-10A
F11-5A
F31-20A
F21-10A
F16-25A
F5-15A
F14-30A
F10-2A
F8-15A
F15-30A
F12-20A
CB-25A
F13-20A
CB-25A
F17-20A
F30-20A
F19-30A
F9-40A
Power Supply (B+) by
CRIMP 10 mm
J-Case Fuses
Mini Fuses
Circuit
Breaker
F9
F19
F1
F3
F5
F6
F8
F10
F11
F12
F13
F14
F15
F16
F17
F30
F31
CB1
CB2
Description
Blower IP HVAC ACC
BCM VBATT08
Airbag Unit
Diagnostic Connector
Cluster IPC
Active Immobilizer, RF Receiver
HVAC Electronic
IGN PEPS Passive Start
AOS System
BCM VBATT01
BCM VBATT02
BCM VBATT03
BCM VBATT04
BCM VBATT05
ESCL unlock
Trunk Outlet
BCM VBATT07
Power seat LH
Power seat RT
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Value
Device
Device Type
Depending on the chosen options, only some of the devices may be installed.
40A
30A
10A
7,5A
15A
5A
15A
2A
5A
20A
20A
30A
30A
25A
20A
20A
20A
25A
25A