Electrical System Equipment & Instructions - Basic Knowledge - 211 Chassis: Other Mercedes-Benz E-class W211/S211

Data bus system function - GF54.00-P-0004A

MODELS 124, 129, 140, 163, 168, 170, 202, 203, 208, 209, 210, 211, 215, 220, 230, 240, 463

Data Bus System Function Block Diagram. Scheme 32

A data bus connects the individual control units and enables them to exchange data.

The signal from a sensor is passed on to the nearest control unit, processed by it and placed on the CAN data bus.

Each control unit that is connected to the CAN data bus can read this signal and use it to calculate an input to control an actuator.

Data Bus System, Block Function Diagram. Scheme 33

All control units are interlinked through the CAN data bus.

A control unit receives a measured value from a sensor, prepares a data telegram from this and places it on the CAN data bus.

All other control units can then read and process this data packet.

Data bus system, advantages - GF54.00-P-0004-04A

With the former wiring of the individual electrical and electronic components (standard wiring) each control unit is directly connected to all sensors and actuators, from which it obtains measured values or which it actuates.

In some cases, this can result in long or redundant cable runs. The data bus system affords the following advantages relative to conventional wiring

CAN data bus, function - GF54.00-P-0005A

MODELS 124, 129, 140, 163, 168, 170, 202, 203, 208, 209, 210, 211, 215, 220, 230, 240, 463

The CAN data bus ( C ontroller A rea N etwork) is a data bus system specifically designed for used in vehicles.

The CAN data bus is a bi-directional bus, that is, each connected control unit is able to send and receive information.

The CAN data bus consists of a special twisted two-core cable. The users (control units) are connected to this cable. Transmission of data takes place redundantly via both cables, whereby the data bus levels are mirrored (that is, if the level on one cable is 0, the other cable transmits level 1 and vice versa). Two-line operation is used for two reasons: for fault detection and as a safety concept.

If a voltage peak occurs on just one line (e.g. due to EMC problems), the receivers can identify this as a fault and ignore the voltage peak.

If a short circuit or a discontinuity occurs on one of the two CAN lines, then due to a safety concept coupled to the software/hardware, the system can change over to single-line operation. The defective data line is shut down.

A specific data protocol controls how and when the participants can send and receive.

The CAN data bus is significantly different to other data bus systems that are based on the participant addressing principle, in that it uses a message-related addressing system.

That means, every CAN message is assigned a fixed address (identifier), which identifies the CAN message content (e.g. coolant temperature). The CAN log permits up to 2048 different CAN messages, the addresses of 2033 to 2048 being permanently assigned. Data capacity per CAN message is 8 bytes.

A recipient only evaluates those CAN messages (data messages) which are stored in its list of CAN messages to be accepted (acceptance filtering).

Data messages can only be sent when the CAN data bus is free (i.e. once a 3 bit interval has elapsed after the last data message, and no control unit starts to send). The data bus level is then in recessive state (logical 1).

If several control units simultaneously start to send, a procedure is applied whereby the CAN message with the highest priority takes precedence, without loss of time or bits (attributing).

Each control unit which looses the attributing becomes a receiver automatically and repeats its transmission attempt as soon as the CAN data bus is free again.

Besides data messages, there is also a request message used for calling a particular CAN message.

The control unit that can provide the requested data message then reacts to the request.

CAN data bus data telegram - GF54.00-P-0005-01A

During normal operation, messages consist of the following transfer frames

1. Data frame for transmitting CAN messages (such as coolant temperature, etc.).
2. Remote frame for requesting CAN data from a different control unit.
3. Error frame informs all connected control units that an error has occurred and that the most recent CAN message is invalid.

The CAN protocol supports two different data frame formats, with the only difference residing in the length of the identifier

1. Standard format
2. Expanded format

Only the standard format is currently in use at DaimlerChrysler.

CAN Data Bus Telegram. Scheme 34

The data telegram for transmitting CAN messages through the CAN data bus consists of seven sequential blocks

1. Start of Frame: (Start bit) Marks the start of a CAN message and synchronizes all stations.
2. Arbitration Field: (identifier and) request) This field consists of the identifier (address) with 11 bits and one control bit (remote transmission request bit). This control bit indicates if the message contains a data frame or a remote frame without bytes.
3. Control Field: (control bits) To distinguish between the standard and expanded format the control field (6 bit) contains a reserved bit for future expansions and the number of bytes contained in the data field in the last 4 bits.
4. Data Field: (data) The data field can contain between 0 and 8 bytes of data. A CAN message with a length of 0 can be employed to synchronize distributed processes.
5. CRC Field: (check field) The CRC Field (Cyclic-Redundancy-check field) consists of 16 bits and is used to detect transmission errors.
6. ACK Field: (receipt confirmation) The ACK Field (Acknowledgment Field) contains a confirmation signal from all receivers that have received the CAN message without error.
7. End of Frame: (frame end) Identifies the end of the data telegram

1. Intermission: (Intermission) Interval between two data telegrams The interval must contain at least 3 bits. The next message can then be sent by any control unit.
2. IDLE: (idle) If no control unit transmits, the CAN data bus remains idle until the next message is sent.

CAN data bus fault recognition - GF54.00-P-0005-03A

Faults which occur during data transfer can result in errors. These transmission errors must therefore be detected and rectified. A distinction is made between two levels of fault identification in the CAN protocol

1. Mechanisms at the data frame level
2. Mechanisms at the bit level

Mechanisms at the data frame level

Cyclic redundancy check

The transmitter establishes test bits from the CAN messages that are to be sent in the data telegram "CRC Field" The receiver calculates these test bits from the received CAN message and compares them to the received test bits.

Frame check

This mechanism checks the structure of the transferred frame by comparing the bit fields with the specified fixed format and frame length.

Errors detected using the frame check are referred to as format errors.

Mechanisms at the bit level

Monitoring

During transmission every station observes the CAN data bus gauge and recognizes the difference between sent and received bits. Both global and local bit errors which occur at the sending unit can therefore be detected.

Bit stuffing

In each message, a maximum of 5 successive bits may have the same polarity between the "start of frame" and the end of the "CRC field". After 5 consecutive identical bits, the sending unit inserts a bit of the opposite polarity into the bit stream. The receiver removes these bits again after the CAN message reception.

Error handling

If any station on the CAN data bus detects an error, it interrupts the current transmission by sending an error message. The error message consists of 6 dominant bits.

When an error message appears a local error is distributed to all the connected control units so that they ignore the transmitted CAN message.

After a short interruption the other control units can transmit CAN messages again according to their priority.

The control unit whose CAN message caused the error also begins to send its CAN message again (Automatic Repeat Request).

CAN data bus, function - GF54.00-P-0005F

MODEL 124 with ENGINE 104,111,119 (except 104.98)

MODEL 129 with ENGINE 104,112,113,119,120 (except 104.98)

MODEL 140 with ENGINE 104, 119, 120

MODEL 163 with ENGINE 112, 113

MODEL 170 with ENGINE 111,112 (except, 112.96)

MODEL 202 with ENGINE 104, 111,112

MODEL 203 with ENGINE 111,112 (except, 112.96)

MODEL 208 with ENGINE 111, 112, 113

MODEL 210 with ENGINE 104, 112, 113, 119

MODEL 215 with ENGINE 113,137 (except 113.99)

MODEL 220 with ENGINE 112,113,137 (except, 113.99)

MODEL 230 with ENGINE 112,113 (except, 113.99)

MODEL 211 with ENGINE 112,113 (except, 113.99)

MODEL 209 with ENGINE 112, 113

Shown on example of Controller Area Network bus class C (engine compartment) (CAN-C) in model 220 with engine 112, 113 and code (219) Distronic (DTR)

Identifying CAN Data Bus Function. Scheme 35

Task

1. Data interchange between the individual control units
2. Readying sensor signals for several systems
3. Reducing the number of wires
4. Improving the electromagnetic compatibility

Design

The data bus consists of a twisted, two-core data line which connects all the participants together in a parallel circuit. The data line lines must not be mixed up (low or high level). The ME-SFI [ME] control unit (N3/10) (except model 124 and model 140), the DAS [FBS] control unit (N73/1) (model 129), the DAS [FBS] radio frequency/infrared control unit (N54/4) (model 129) and the DAS [FBS] radio frequency control unit (N54/3) (model 170) are regarded as terminals as far as bus adaptation is concerned. A terminating resistor of 120 ohms is fitted in each case. Exception: ME-SFI [ME] control unit (N3/10) with engine 120 (each fitted with 240 ohms).

When measuring the resistance on the data line (circuit 15 OFF), the various terminating resistors in the terminals are connected in parallel

Scheme 36

Function

The data are transmitted digitally on the data bus at various intervals. The individual data blocks are defined in a protocol and this also states which data are received or transmitted by a control unit. Each connected control unit is able to transmit or receive data.

The total of the data blocks, the short pause between 2 transmission intervals and further properties of the data bus are checked constantly. Any faults detected are stored.

Vehicles with EIS [EZS] control unit (N73)

In the vehicle a distinction is made between a fast Controller Area Network bus class C (engine compartment) (CAN-C) and Controller Area Network bus class B (interior) (CAN-B) which is 6 times slower. The EIS [EZS] control unit (N73) forms the interface (Gateway) for this. This does not apply to vehicles with a central gateway control unit (N93) (except model 203).

Vehicles with central gateway control unit (N93)

The central gateway control unit forms the interface (Gateway) between the two data buses (N93) (except model 203). The central gateway control unit (N93) serves as the interface for STAR DIAGNOSIS for all model series.

The new control unit must be coded again when exchanging control unit. The control unit can be coded via a menu in the handheld tester (up to 07/99) or via STAR DIAGNOSIS

CAN data bus, function - GF54.00-P-0005IC

MODEL 211 with ENGINES 647.961, 648.961

Identifying Additional Battery And Battery Components - Installation Survey Of Batteries. Scheme 37

CAN stands for " C ontroller A rea N etwork". This is an electrical bus system for carrying data over two wires.

The tasks are

1. Data transfer between individual control units
2. Readying sensor signals for several systems
3. Reducing the number of electric cables
4. Improving the electromagnetic compatibility (EMC)

The CAN data bus consists of a special twisted two-core data line that connects all CAN users (control units) in parallel.

The two lines of the data line must not be mixed up (low level/high level). The CDI control unit always represents a terminal in terms of bus adaptation.

A 120 ohms terminating resistor should therefore be installed in the CDI control unit.

The data are transmitted digitally over the CAN databus at various intervals. The individual data blocks are defined in a data protocol and it is specified which data are received or transmitted by a control unit. Each connected control unit is able to transmit or receive data (bidirectional bus).

The sum of the data blocks, the short break between two transmission intervals and additional properties of the CAN data bus are checked constantly. Detected faults are stored and placed in the fault memory.

In the vehicle a distinction is made between a fast (500 kbits/s) engine CAN data bus (CAN CAN-C) for the drive and chassis systems and the slightly slower (83.3 kbit/s) body CAN data bus. (CAN-B) structure for the vehicle interior.

For external vehicle diagnosis using STAR DIAGNOSIS a CAN data bus diagnosis (CAN-D) with a speed of 500 kbit/s is also available.

The interface between the three CAN data buses (Gateway) is located in the central gateway control unit.

The instrument cluster, electronic ignition switch control unit and the steering column module are connected with both the body CAN data bus and the engine CAN data bus and exchange data with both data bus systems. But they do not act as an interface (Gateway) between both data bus systems!

When a control unit is replaced, the new control unit must be coded again

This control unit coding is possible via a

STAR DIAGNOSIS menu.

The international standardized network management "OSEK" ( O pen systems and their I nterfaces for E lectronics in motor vehicles) is used for all control units of the CAN data bus

CAN data bus, function - GF54.00-P-0005T

MODEL 211, 219 with ENGINE 113.990

Identifying Air Injection Relay - Model Year 2004. Scheme 38

CAN stands for " C ontroller A rea N etwork". This is an electrical bus system for carrying data over two wires.

The tasks are

1. Data interchange between the individual control units
2. Readying sensor signals for several systems
3. Reducing the number of wires
4. Improving the electromagnetic compatibility (EMC)

The CAN data bus consists of a special twisted two-core data line that connects all CAN users (control units) in parallel.

The two wires of the data line must not be mixed up (low level / high level). The motor electronics (N3/10) control unit is always a consumer with regard to bus adaptation.

A 120 ohms terminating resistor is therefore installed in the Motor electronics control unit.

The data are transmitted digitally over the CAN data bus at various intervals. The individual data blocks are defined in a data protocol and it is specified which data are received or transmitted by a control unit.

Each connected control unit is able to transmit or receive data (bidirectional data bus).

The sum of the data blocks, the short break between two transmission intervals and additional properties of the CAN data bus are checked constantly. Detected faults are stored and placed in the fault memory.

In the vehicle a distinction is made between a fast (500 kbit/s) engine CAN data bus (CAN-C) for the drive systems and chassis systems and the slower (83.3 kbit/s) body CAN data bus (CAN-B) structure for the vehicle interior.

In addition for external vehicle diagnosis using STAR DIAGNOSIS there is a CAN diagnosis data bus (CAN-D) with a speed of 500 kbits/s.

The interface between the three CAN data buses (Gateway) is located in the central gateway control unit (N93).

The instrument cluster (A1), electronic ignition switch control unit (N73) and steering column module (N80) are connected both with the CAN data bus, body and with the CAN data bus, engine and exchange data with both data bus systems. However, they do not serve as an interface (gateway) between both data bus systems!

When a control unit is replaced, the new control unit must be coded again

This control unit coding is possible via a STAR DIAGNOSIS menu.

The international standardized network management "OSEK" (open systems and their interfaces for electronics in vehicles) is used for all control units on the CAN data bus

CAN data bus, function - GF54.00-P-0005VA

MODEL 203 with ENGINE 272.920

MODEL 211 with ENGINE 272.922

MODEL 203, 209 with ENGINE 272.940

MODEL 203 with ENGINE 272.941

MODEL 171 with ENGINE 272.942

MODEL 211 with ENGINE 272.943

MODEL 211 with ENGINE 272.944

MODEL 251 with ENGINE 272.945

MODEL 221 with ENGINE 272.946

MODEL 203, 209 with ENGINE 272.960

MODEL 171 with ENGINE 272.963

MODEL 211, 219 with ENGINE 272.964

MODEL 221 with ENGINE 272.965

MODEL 230 with ENGINE 272.966

MODEL 164, 251 with ENGINE 272.967

MODEL 203 with ENGINE 272.970

MODEL 211 with ENGINE 272.972

MODEL 221 with ENGINE 272.975

MODEL 221 with ENGINE 273.922

MODEL 164 with ENGINE 273.923

MODEL 221 with ENGINE 273.924

MODEL 164 with ENGINE 273.943

MODEL 211, 219 with ENGINE 273.960

MODEL 216, 221 with ENGINE 273.961

MODEL 211 with ENGINE 273.962

MODEL 164, 251 with ENGINE 273.963

MODEL 230 with ENGINE 273.965

MODEL 209 with ENGINE 273.967

MODEL 221 with ENGINE 273.968

CAN stands for " C ontroller A rea N etwork". This is an electrical bus system for carrying data over two wires.

The tasks are

1. Data exchange between the individual control units
2. Readying sensor signals for several systems
3. Reducing the number of wires
4. Improving the electromagnetic compatibility (EMC)

The CAN data bus consists of a special twisted two-core data line that connects all CAN users (control units) in parallel.

The two wires of the data line must not be mixed up (low level / high level). The motor electronics (N3/10) control unit is always a consumer with regard to bus adaptation.

A 120 ohms terminating resistor is therefore installed in the Motor electronics control unit.

The data are transmitted digitally over the CAN data bus at various intervals. The individual data blocks are defined in a data protocol and it is specified which data are received or transmitted by a control unit.

Each connected control unit is able to transmit or receive data (bidirectional data bus).

The sum of the data blocks, the short break between two transmission intervals and additional properties of the CAN data bus are checked constantly. Detected faults are stored and placed in the fault memory.

In the vehicle a distinction is made between the fast (500 kbit/s) engine compartment data bus and diagnostic CAN-data bus and the slower (83.3 kbit/s) interior CAN data buses.

The new control unit must be coded when a control unit is replaced.

This control unit coding takes place via a STAR DIAGNOSIS menu.

The international standardized network management "OSEK" ( O pen systems and their I nterfaces for E lectronics in motor vehicles) is used for all control units of the CAN data bus.

Two batteries for vehicle power supply, function - GF54.10-P-1001T

MODEL 211.0 /2 up to 31.5.06 except CODE (494) USA version except CODE (498) Japan version

MODEL 211.0 /2 up to 30.6.06 with CODE (494) USA version with CODE (498) Japan version

Installation survey of batteries shown on model 211.0

Interlinkage of components

Identifying Fuse Assignment Of Fuse Box In Interior Compartment - Driver's Side. Scheme 39

The battery control unit (N82) is integrated in the power supply of the vehicle. The battery control unit increases the availability of the vehicle power supply by introducing energy management measures.

To do this, it determines the load capacity of the battery (G1).

The battery control unit (N82) is planned for a 14-V-on-board electrical system with the battery (G1), which is designed as a 12-V-lead battery (AGM-or wet battery). The additional battery (G1/7) is connected for charging if necessary in order to assist the onboard electrical system in particular situations. Via the additional battery relay (K57/2) the additional battery (G1/7) can be connected through the battery control unit (N82).

Function conditions

The battery control unit (N82) operates within the specified voltage and temperature limits when the on-board voltage is supplied.

Connection of electrical devices (consumers or chargers in the broadest sense) direct to the battery post of the battery (G1) while bypassing the current sensor is not permissible.

Function sequence

The battery control unit (N82) records the current from the negative terminal of the battery (G1) or if the additional battery (G1/7) is connected, the current from both batteries The voltage of the battery (G1) is determined via circuit 30 which simultaneously serves the supply of the battery control unit (N82). An internal temperature supply of the battery control unit (N82). An internal temperature sensor is used to draw conclusions about the temperature of the battery (G1)

The voltage of the auxiliary battery (G1/7) is also measured.

Should the battery (G1) and/or the additional battery (G1/7)be replaced, then only the replacement parts used by DaimlerChrysler AG be used

The buffer algorithm continuously determines the dynamic internal resistance of the battery (G1) from the recorded current and voltage values. When the alternator (G2) is running this is the basic parameter for the following functions

1. Consumer shutoff
2. Idle speed increase
3. Activation of additional battery (G1/7)

The maximum current demand of the vehicle is limited to I > or = 100 A by switching off consumers. A calculation is also made as to which state of charge prevails when the battery is loaded (G1) with I = 100 A. This is a measure for the load capacity of the battery (G1). If the alternator (G2) fails, 100 % of the power required is provided by the battery (G1).

The effective characteristics of the battery control unit (N82) is determined by the overall condition of the vehicle and determined in the integral linking part.

The battery control unit (N82) actuates both the cutoff relay for interruptible loads (K75) directly to deactivate the consumer socket as well as the additional battery relay (K57/2) to activate the additional battery (G1/7).

Once the battery has been disconnected (G1) the vehicle must be started because this is how the battery control unit (N82) determines the start value for internal battery resistance

The battery control unit (N82) is not able to predict battery defects

Consumer shutoff

In the event of problems in the two-battery on-board electrical system various messages are displayed in the multifunction display (A1p13) in the instrument cluster (A1).

If the battery control unit (N82) detects a fault in the power consumption or a poor condition of the battery (G1), the driver is informed through the multifunction display (A1p13) in the instrument cluster (A1) about the corresponding charge level.

Messages which are displayed in the color white, only have information functions, so that consumers which do not impair driving safety are switched off until the overall condition of the on-board electrical system has stabilized again.

Amongst others the consumer shutoff is signaled by the flashing on and off of the switched-on heated rear window or heated seats.

The following messages can be displayed in white in the multifunction display (A1p13) in the Instrument cluster (A1)

1. Message "MALFUNCTION:ELECTRICAL CONSUMER SWITCHED OFF" (up to 08.2003) "Battery protection, comfort functions temporarily switched off" (as of 09.2003)

The charge level of the battery is too low (G1).

Cutout stage 1 is activated at a voltage of approx. > 11 V.

Cutout stage 2 is activated at a voltage of approx. > 10.5 V.

The following messages are displayed in red in the multifunction display (A1p13) in the instrument cluster (A1)

1. Messages "BATTERY/ALTERNATOR - CONSULT WORKSHOP" and simultaneously "ELECTRICAL CONSUMER SWITCHED OFF" (up to 08.2003)
2. "Locate workshop" in conjunction with the battery symbol in the display (as of 09.2003), the signal of circuit 61 cannot be read in via the interior CAN. The message appears, if the battery control unit (N82) is defective, the alternator (G2), the additional battery relay (K57/2) or the additional battery (G1/7) are defective.
3. When the "STOP BATTERY/ALTERNATOR" message appears the additional battery (G1/7) is activated for the on-board limp home and simultaneously a consumer shutoff conducted. This message appears when the vehicle rolls without the engine and the battery is flat (G1) or when the engine is running the additional battery (G1/7) is connected but the on-board electrical system is still unstable.

The two-battery on-board electrical system can be diagnosed via STAR DIAGNOSTIC

The following consumers are switched off during consumer cutoff stage 1

1. Heated rear window
2. Memory
3. Interior blower (reduced to 69 %)
4. Headlamp cleaning system
5. Seat adjustment front passenger
6. Seat heating/ventilation
7. Multicontour backrest [OSB]
8. Entrance lamp
9. Exit lamp
10. Warning lamp
11. Steering wheel air conditioning
12. Dynamic seat
13. Stationary heater

The following consumers are switched off during consumer cutoff stage 2

1. Parktronic
2. Trunk lid remote closing
3. Washer fluid hose heater
4. Washer nozzle heater
5. Mirror heater
6. Reading lamp
7. Interior illumination
8. Footwell lighting
9. Load compartment illumination
10. Rear/load compartment socket
11. Front cigarette lighter
12. Trailer socket
13. Interior blower (reduced to 53 %)

Fuse and relay box, as-built configuration - GF54.15-P-0800T

MODEL 211.0 /2 except CODE () up to Model Year 06 including

Identifying Fuse Assignment Of Front Prefuse Box - Front. Scheme 40

Location on example of model 211.0

Location of additional relay on model 211.0 up to and including code 804 Model year 2004 (only engine 113.990 (E 55 AMG))

The air injection relay (K17) is located in the engine compartment on the rear right under the dust filter housing or combination filter housing

Location on example of model 211.0 as of code 805 Model year 2005 (only engine 113.990 (E 55 AMG))

Fitting point under the right side trim in the luggage compartment

Identifying Fuse Assignment Of Rear Prefuse Box - Front. Scheme 41

Location on example of model 211.0

The second battery additional fuse (F30) is attached to the wiring harness next to the additional battery (G1/7) and is designed as a circuit breaker (bimetal fuse)

The NECK-PRO head restraints relay (K41/1) is located in the wiring harness of the frame floor group on the driverside at the entrance

Identifying Fuse Assignment Of Rear Prefuse Box - Rear. Scheme 42

Fuse assignment of fuse and relay box in left engine compartment - GF54.15-P-1256-03TA

Driver-side fuse and relay module

The S relay (AIRmatic relay (K67)) and T (cutoff relay for interruptible loads (K75s)) are only clipped on to the driver-side SAM control unit with fuse and relay module

Identifying Assignment Of Fuse And Relay Box In Luggage Compartment. Scheme 43

Fuse assignment of fuse and relay box in left engine compartment - GF54.15-P-1256-03TB

Driver-side fuse and relay module

The S relay (AIRmatic relay (K67)) and T (cutoff relay for interruptible loads (K75)) are only clipped on to the driver-side SAM control unit with fuse and relay module

Identifying Fuel Pump Relay Position. Scheme 44

Fuse assignment of fuse and relay box in left engine compartment - GF54.15-P-1256-03TC

Driver-side fuse and relay module

The S relay (AIRmatic relay (K67)) and T (cutoff relay for interruptible loads (K75)) are only clipped on to the driver-side SAM control unit with fuse and relay module

Identifying Fuel Pump Relay - Type 211.2. Scheme 45

Fuse assignment of fuse box in interior compartment on driver's side - GF54.15-P-1256-04TA

Interior fuse box

Identifying Fuse Assignment Of Fuse Box In Interior Compartment - Driver's Side. Scheme 46

Fuse assignment of fuse box in interior compartment on driver's side - GF54.15-P-1256-04TB

Interior fuse box

Fuse assignment of fuse box in interior compartment on driver's side - GF54.15-P-1256-04TC

Interior fuse box

Identifying Fuel Pump Relay Module - Shown On Model 140. Scheme 47

Fuse assignment of fuse and relay box in trunk - GF54.15-P-1256-06TA

Shown: fuse and relay box

Identifying Upper Control Panel Control Unit Location - Model 211.0 /6. Scheme 48

Fuse assignment of fuse and relay box in trunk - GF54.15-P-1256-06TB

Shown: fuse and relay box

Identifying Upper Control Panel Control Unit Switch Location. Scheme 49

Fuse assignment of front prefuse box - GF54.15-P-1256-07T

Front

The front prefuse (F32)is located in the footwell on the passenger-side

Identifying Upper Control Panel Control Unit Switch Location. Scheme 50

Rear

Identifying Fuse Assignment Of Front Prefuse Box - Rear. Scheme 51

Fuse assignment of front prefuse box - GF54.15-P-1256-07TA

Front

The front prefuse (F32)is located in the footwell on the passenger-side

Rear

Identifying Bottom Control Panel Control Unit Components. Scheme 52

Fuse assignment of rear prefuse box - GF54.15-P-1256-08TA

Front

Identifying Fuse Assignment Of Rear Prefuse Box - Front. Scheme 53

Rear

Identifying Rain/Light Sensor - Shown On Model 209.3. Scheme 54

Fuse assignment of rear prefuse box - GF54.15-P-1256-08TB

Front

Rear

Identifying Steering Column Module Location - Model 211.0. Scheme 55

Fuse assignment of rear prefuse box - GF54.15-P-1256-08TC

Front

Identifying Rear SAM Control Unit With Fuse And Relay Module Location - Model 211.0. Scheme 56

Rear

Relay assignment of fuse and relay box in left side of engine compartment - GF54.15-P-1257-03T

Driver-side fuse and relay module

The S relay (AIRmatic relay (K67)) and T (cutoff relay for interruptible loads (K75)) are only clipped on to the driver-side SAM control unit with fuse and relay module

Identifying Data Link Connector. Scheme 57

Relay assignment of fuse and relay box in trunk - GF54.15-P-1257-04T

Assignment of fuse and relay box in luggage compartment

Fuel pump relay position - GF54.15-P-4105-01T

The fuel pump relay is located in the bottom left of the luggage compartment.

Fuel pump relay, function - GF54.15-P-4105-02AM

If the relay is actuated by the ME-SFI [ME] control unit (N3/10) by a ground signal at "circuit 86", it closes its power contact. When the power contact is closed the fuel pump control unit (N118) and the Fuel pump(s) (M3) are connected via "circuit 87" with voltage from "circuit 30".

The two fuel pumps are connected in parallel on model 211, 219

Identifying Fuel Pump Relay With Circuit Diagram. Scheme 58

Fuel pump relay position / task / design / function - GF54.15-P-4105L

ENGINE 104 (except 104.98) in MODEL 129,140, 202, 210

ENGINE 111 in MODEL 163, 170, 202, 203, 208, 210

ENGINE 112 (except 112.96) in MODEL 163, 170, 202, 203, 208, 209, 210, 211, 220, 230

ENGINE 113 (except 113.99) in MODEL 129, 163, 208, 209, 210, 211, 215, 220, 230

ENGINE 119 (except 119.96) in MODEL 129,140, 210

ENGINE 120.982 in MODEL 140

ENGINE 120.983 in MODEL 129

ENGINE 137 in MODEL 215, 220

ENGINE 612.963 in MODEL 163

ENGINE 628.963 in MODEL 163

The brief designation relay differs for the various models.

Identifying Fuel Pump Relay Module. Scheme 59

Fuel pump relay function - GF54.15-P-4105-02L

Shown on model 140

The fuel pump relay (K27) is switched by a ground signal from the control unit at terminal 86. If the contact is closed, the fuel pump (M3) is connected to terminal 30 (B+) via terminal 87. Circuit 30 is protected by a 30 A fuse.

With models 129, 140, 202, 208, the fuse is attached to the relay.

On vehicles with two fuel pumps, the pumps are connected in parallel.

Steering column module, task - GF54.21-P-4104-02T

The steering column module (N80) has the following operations

Scanning

1. Buttons of multifunction steering wheel: Left multifunction steering wheel button group (S110) Right multifunction steering wheel button group (S111)
2. Combination switch (S4)
3. Cruise control pushbutton switch (S40/4)
4. Steering column adjustment/steering wheel heater switch (S59/1) (with code (443) steering wheel heater or code (275a) memory package (driver seat, steering column, mirrors))
5. VCS switch (S93/2) (with code (813) voice control system (VCS))
6. Steering angle sensor (N49)

Actuate

1. Search illumination of multifunction steering wheel
2. Yellow LED, variable speed limiter (S40/4v1)
3. Steering wheel heater function indicator (S59/1e1) (with code (443) steering wheel heater)

Transfer

The signals of the following components are not read in by the steering column module (N80) but only looped through

1. Driver airbag squib 1 (R12/13) and
2. Driver airbag squib 2 (R12/14)
3. Steering wheel heater electronics (A74) (with code (443) steering wheel heater)

The steering column module (N80) is connected to the Controller Area Network bus class B (interior) (CAN-B) and Controller Area Network bus class C (engine compartment)

(CAN-C)

However, it cannot act as an interface (Gateway) between the two bus systems, i.e. no data is exchanged between CAN-B and CAN-C via the steering column module (N80).

Upper control panel control unit, task - GF54.21-P-4105-02T

The upper control panel control unit (N72/1) is connected to the Controller Area Network bus Class B (interior) (CAN B) for the exchange of data.

The upper control panel control unit (N72/1) has the following tasks

Reading in the integral switches

1. ESP OFF switch (N72/1s1)
2. Rear head restraints switch (N72/1s4)
3. Hazard warning system switch (N72/1s5)
4. Interior central locking and ATA function display switch (N72/1s6)
5. Rear roller blind switch (N72/1s9) (with code (540) Electric rear window roller blind)
6. Left front HS [SIH] switch (N72/1s10) (with code (873) Heated left and right front seats or with code (401) Front comfort seats, incl. seat heating and seat ventilation)
7. Right front HS [SIH] switch (N72/1s11) (with code (873) Heated left and right front seats or with code (401) Front comfort seats, incl. seat heating and seat ventilation)
8. Left front seat ventilation switch (N72/1s13) (with code (401) Front comfort seats, incl. seat heating and seat ventilation)
9. Right front seat ventilation switch (N72/1s14) (with code (401) Front comfort seats, incl. seat heating and seat ventilation)
10. Upper control panel carrier open/close switch (N72/1s15)

Actuation of the following components

1. Switch and controls illumination of integrated switches
2. Automatic child seat recognition airbag OFF indicator lamp (N72/1e1)

On vehicles as of 1.6.07 and without code (U18) automatic child seat recognition (ACSR) the automatic child seat recognition airbag OFF indicator lamp (N72/1e1) is only actuated with circuit 15 On for the lamp check for approx. 4 s, over and above this the automatic child seat recognition airbag OFF indicator lamp (N72/1e1) is nonfunctional

Upper control panel control unit, task - GF54.21-P-4105-02TS

The upper control panel control unit (N72/1) is connected to the Controller Area Network bus Class B (interior) (CAN B) for the exchange of data.

The upper control panel control unit (N72/1) has the following tasks

Reading in the integral switches

Scheme 60

Scheme 61

1. ESP OFF switch (N72/1s1)
2. Rear head restraints switch (N72/1s4) (up to 31.5.06)
3. Hazard warning system switch (N72/1s5)
4. Interior central locking and ATA function display switch (N72/1s6)
5. Left front HS [SIH] switch (N72/1s10) (with code (873) Heated left and right front seats or with code (401) Front comfort seats, incl. seat heating and seat ventilation)
6. Right front HS [SIH] switch (N72/1s11) (with code (873) Heated left and right front seats or with code (401) Front comfort seats, incl. seat heating and seat ventilation)
7. Rear-end door wiper switch (N72/1s12) (up to 31.5.06 (not or ) or up to 30.6.06 (only or ))
8. Left front seat ventilation switch (N72/1s13) (with code (401) Front comfort seats, incl. seat heating and seat ventilation)
9. Right front seat ventilation switch (N72/1s14) (with code (401) Front comfort seats, incl. seat heating and seat ventilation)
10. Upper control panel carrier open/close switch (N72/1s15)

Actuation of the following components

1. Switch and controls illumination of integrated switches
2. Automatic child seat recognition airbag OFF indicator lamp (N72/1e1)

On vehicles as of 1.6.07 and without code (U18) automatic child seat recognition (ACSR) the automatic child seat recognition airbag OFF indicator lamp (N72/1e1) is only actuated with circuit 15 On for the lamp check for approx. 4 s, over and above this the automatic child seat recognition airbag OFF indicator lamp (N72/1e1) is nonfunctional

Driver-side SAM control unit with fuse and relay module, task - GF54.21-P-4109-01T

Task

The driver-side SAM control unit with fuse and relay module (N10/1) is connected to the Controller Area Network bus Class B (interior) (CAN-B) for the exchange of data

The driver-side SAM control unit with fuse and relay module (N10/1) reads in the following signals, sensors and switches, controls if necessary their function illumination and switch and controls illumination and switches the following relays and consumers via semiconductor switches.

Control

1. Left front exterior lights
2. Footwell lighting
3. Ventilation of control unit box
4. Wiper system (WSA)
5. Fanfare horns (H2), right-hand fanfare horn (H2/1)
6. Headlamp cleaning system (SRA) (with code (600) headlamp cleaning system)
7. Heating the windshield washer system (with code (875) heated windshield washer system)

Reading and outputting the following signals

1. Circuit 61 and circuit 58d
2. Wake-up signal for air suspension

(with code (489) Airmatic (semi-active air suspension))

Reading in following sensors

1. Coolant temperature sensor (B11/4)
2. Refrigerant pressure and temperature sensor (B12/2) (up to 31.5.05)
3. Refrigerant pressure sensor (B12) (as of 1.6.05)
4. Outside temperature indicator temperature sensor (B14)

Reading in the following switches

1. Rotary light switch (S1)
2. HCS [SRA] switch (S1s1) (with code (600) headlamp cleaning system up to 31.5.07)
3. Brake fluid indicator switch (S11)
4. Parking brake switch (S12)
5. Coolant level indicator switch (S41)
6. Windshield washer system fluid level indicator switch (S42)
7. Left front brake pad contact sensor (S10/1)
8. Right front brake pad contact sensor (S10/2)
9. Right rear brake pad contact sensor (S10/4)

Switching the relay

1. Fanfare horn relay (N10/1kO)

Switching loads

1. Left high beam (E1e1)
2. Left low beam (E1e2)
3. Left standing and parking lamp (E1e3)
4. Left turn signal lamp (E1e5)
5. Left front fog lamp (E5/1)
6. Right front footwell lamp (E17/15)
7. Left front footwell lamp (E17/16)
8. Right rear footwell lamp (E17/17)
9. Left rear footwell lamp (E17/18)
10. Control unit box blower motor (M2/2)
11. Windshield washer fluid pump (M5/1)
12. Washer nozzle heating (R2/1)
13. Heat exchanger shutoff motor (M16/32)
14. Washer nozzle hose heater (R2/11) (with code (875) heated windshield washer system)
15. HCS [SRA] pump (M5/2) (with code (600) headlamp cleaning system)
16. Left front side-marker lamp (E6/1) (for code (494) USA version)
17. Right front side-marker lamp (E6/2) (for code (494) USA version)
18. Shift gate illumination (S16/5e1) (with code (460) Additional parts, Canadian vehicles, code (625) Australia version or code (494) USA version)

Variant coding

1. Code (460) Additional parts, Canadian vehicles
2. Code (494) USA version
3. Code (625) Australia version

Passenger-side SAM control unit with fuse and relay module, task - GF54.21-P-4111-01T

The passenger-side SAM control unit (N10/11) is connected to the Controller Area Network bus class B (interior) (CAN-B) for the exchange of data. The passenger-side SAM control unit (N10/11) reads in the following switches, actuates their function, switch and controls illumination if applicable, and switches the following relays and consumers via semiconductor switches.

The passenger-side SAM control unit (N10/11) is used to control the following functions

1. Right front exterior lights
2. Actuation of fanfare horns (H2) and right fanfare horn (H2/1)
3. Coolant circulation pump (M13) for residual heat
4. of heated seats of driver and front passenger seat (with vehicles as of 1.6.05 with code (873) Heated left and right front seats, without code (872) Electrically heated left and right rear seats and without code (401) Front deluxe seats, incl. seat heating and seat ventilation)

Switching the following relays (with code (889) Keyless Go)

1. Circuit 15R relay (N10/1kP)
2. Circuit 87 relay, chassis (N10/1kK)

Reading in the following switches

1. Backup lamp switch (S16/2) (only model 211.0/2 with transmission 716.6)

Switching consumers via semiconductor switches

1. Right high beam (E2e1)
2. Right low beam (E2e2)
3. Right standing and parking lamp (E2e3)
4. Right turn signal lamp (E2e5)
5. Right front fog lamp (E5/2)
6. Coolant circulation pump (M13)

Voltage supply

(with vehicles as of 1.6.05 with code (873) Heated left and right front seats, without code (872) Electrically heated left and right rear seats and without code (401) Front deluxe seats, incl. seat heating and seat ventilation)

1. Left front seat heated cushion (R13/1)
2. Left front backrest heated cushion (R13/2)
3. Right front seat heated cushion (R13/3)
4. Right front backrest heated cushion (R13/4)

Rear SAM control unit with fuse and relay module, task - GF54.21-P-4112-01T

Tasks of rear SAM control unit with fuse and relay module (N10/2)

The rear SAM control unit with fuse and relay module (N10/2) is connected to the interior CAN and has several tasks. They are as follows

1. Reading in of sensors
2. Reading in of switches
3. Reading in of sensors
4. Reading in of signals
5. Control of actuators
6. Output of request and status signals
7. Fused power supply (terminal 30) of control units
8. Evaluation and processing of read-in measured quantities

It also provides the slots for the fuses and relays of the discretely connected control units and relays.

Reading in of sensors

The following sensors are read in via CAN-B

1. Interior protection sensor (N70/2b1) with code 882 (Interior monitoring (with ATA [EDW] only)) and code 413 (Panoramic sliding sunroof)
2. Interior protection sensor (E15/3b2) with code 882 (Interior monitoring (with ATA [EDW] only)), except code 413 (Panoramic sliding sunroof)
3. Battery sensor (B95) as of code 807 Model year 2007

Reading switches

The following switches are read in via CAN-B

1. Rotary light switch (S1)
2. Combination switch (S4)
3. Backup light switch (S16/2) with manual transmission
4. Electronic selector lever module control unit (N15/5) with automatic transmission
5. Heated rear window button on AAC [KLA] control and operating unit (N22) or Comfort-AAC (N22/7)
6. Rear roller blind switch (N72/1s9)

The following switches are read in directly

1. Left front door contact switch (S17/3), right front door contact switch (S17/4), left rear door contact switch (S17/5) and right rear door contact switch (S17/6)
2. Trunk lid lock switch (S88/2)
3. Lock pawl rotary tumbler switch (S88/4)
4. Trunk lid contact switch (S88/6)
5. Trunk lid external operation switch (S88/8)
6. ATA [EDW] hood switch (S62) with code 551 (Anti-theft alarm system (ATA [EDW]))
7. Left rear seat release switch (S132/1) and right rear seat release switch (S132/2)
8. Left rear backrest angle switch (S54/5) and right rear backrest angle switch (S54/6)
9. Trunk lid emergency release switch (S88/10)

The following switches are read in via CAN-B and directly

1. Transmitter key (A8/1)
2. Stop light switch (S9/1)

Reading in of sensors

The following sensors are read in directly

1. ATA [EDW] inclination sensor (B33) with code 551 Anti-theft alarm system (ATA [EDW])
2. Fuel level sensor, left tank half (B4/1) and right tank half (B4/2)

Reading in of signals

The following signals are read in via CAN-B

1. Request signal for locking/unlocking via CAN-B
2. Crash signal
3. Request signal for turn signal, brake, parking, standing, fog and backup lights
4. Trailer hitch socket (13-pin) (X58) with code 550 Trailer hitch
5. Request signal for SVMCU flashing (only on special-purpose vehicles)

The following signals are read in directly

1. Panic alarm signal via left antenna amplifier module (A2/64)

Control of actuators

The following actuators are actuated directly

1. Outer left taillight, parking light, rear fog light (E3e2) and outer right taillight, parking light, rear fog light (E4e2)
2. Inner left taillight, rear fog light (E3e5) and inner right taillight, rear fog light (E4e5)
3. Left license plate lamp (E19/1) and right license plate lamp (E19/2)
4. Left brake light (E3e4) and right brake light (E4e4)
5. Inner left turn signal light (E3e7) and inner right turn signal light (E4e7)
6. Center high-mounted brake lamp (E21)
7. Left luggage compartment lamp (E18/5) and right luggage compartment lamp (E18/4)
8. Trunk lid ambient lamp (E40)
9. Heated rear window (R1)
10. Left antenna amplifier module (A2/64)
11. Alarm signal horn (H3) with code 551 Anti-theft alarm system (ATA [EDW])
12. Fuel filler flap CL [ZV] motor (M14/10)
13. Rear roller blind motor (M24) with code 540 Electric rear window roller blind
14. Fuel pump (M3)
15. Left rear head restraint motor (M53/1), center rear head restraint motor (M53/3) and right rear head restraint motor (M53/2)

The following actuators are actuated via CAN-B

1. Interior central locking and ATA [EDW] function display switch with code 551 Anti-theft alarm system (ATA [EDW])
2. Front dome lamp (N70e1)

Output of request and status signals

The following request and status signals are output via CAN-B

1. Output of panic alarm request
2. Status of left front door contact switch (S17/3), right front door contact switch (S17/4), left rear door contact switch (S17/5) and right rear door contact switch (S17/6)
3. "Close" or "open" request of central locking system
4. Position of rear seat backrest
5. Fill level of fuel tank

Fused power supply (tml. 30) of control units

The following control units receive a fused power supply via the rear SAM control unit with fuse and relay module (N10/2)

1. Radio (A2)
2. HS [SIH] and seat ventilation control unit (N25/7) with code 401 Front comfort seats, incl. seat heating and seat ventilation or with code 872 Electrically heated left and right rear seats or with code 873 Right and left front seat heaters
3. Trailer connection unit [AAG] control unit (N28/1) with code 550 Trailer hitch
4. Overhead control panel control unit (N70)
5. Driver front seat adjustment control unit with memory (N32/1) and front passenger front seat adjustment control unit with memory (N32/2) with code 275 Electrically adjustable driver seat, steering column and outside mirrors with memory
6. TPM [RDK] control unit (N88) with code 475 Tire pressure monitor (Beru) up to and including code 805 Model year 2005
7. TPM [RDK] control unit (N88) with code 475 Tire pressure monitor (Siemens) as of code 806 Model year 2006
8. PTS control unit (N62) with code 220 Parktronic system
9. Navigation processor (N41/1) with code 527 COMAND APS (with navigation system)
10. Audio gateway control unit (N93/1) with code 810 Sound system

Rear SAM control module with fuse and relay module, task - GF54.21-P-4112-01TJ

General

The rear SAM control module with fuse and relay module (N10/2) is connected to the CAN class B.

It detects digital and analog sensor signals, fill levels and the status of switches. This information is passed on the CAN class B.

Moreover, the control module controls semiconductor switches that are housed in the rear SAM control module with fuse and relay module (N10/2) and the relays of the fuse and relay blocks.

Tasks

Controlling

1. Emergency door opening (if a crash occurs)
2. Heated rear window (R1)
3. Anti-theft alarm system (ATA) (with code (551a) Anti-theft alarm system (ATA))
4. Turn signals (as master)
5. Cargo space cover
6. Retractable rear head restraints

Reading switches, pickups, sensors and signals

1. Left front door contact switch (S17/3)
2. Right front door switch (S17/4)
3. Left rear door contact switch (S17/5)
4. Right rear door contact switch (S17/6)
5. ATA engine hood switch (S62) (with code (551a) anti-theft alarm system (ATA))
6. Cargo space cover limit switch (S69/14)
7. Left rear seat unlocking switch (S132/1)
8. Right rear seat unlocking switch (S132/2)
9. Left rear backrest angle switch (S54/5)
10. Right rear backrest angle switch (S54/6)
11. Fuel level sensor, left half of tank (B4/1)
12. Fuel level sensor, right half of tank (B4/2)
13. Integrated crash sensor
14. ATA inclination sensor (B33) (with code (551a) anti-theft alarm system (ATA))
15. Left antenna amplifier module (A2/64)
16. Term. 54 (stop lamp)

Switches of consumers via the printed circuit board relay

1. Cargo space cover motor (M50)

Switches of consumers via semiconductor switches

1. Alarm signal horn (H3) (with code (551a) Anti-theft alarm system (ATA))
2. Left (E15/8) and right load compartment lamp (E15/9)
3. Left taillamp (E3)
4. Right taillamp (E4)
5. Multicontour seat pneumatic pump (M40)
6. Center high-mounted stop lamp (E21)
7. Right head restraint release valve (Y24/10)
8. Left head restraint release valve (Y24/9)

Switching the following relays

1. Relay 2, terminal 15R (N10/2kB)
2. Reserve relay 2 (N10/2kC)
3. Rear wiper relay (N10/2kD)
4. Rear window defroster relay (N10/2kE)
5. Relay 1, terminal 15R (N10/2kF)
6. Filler cap relay, polarity reverser 1 (N10/2kG)
7. Filler cap relay, polarity reverser 2 (N10/2kH)

Lower control panel control module, task - GF54.21-P-4116-01T

Lower control panel control module (N72), tasks

Reading in the following switches (depending on equipment)

1. DTR switch (N72s9)
2. STH switch (N72s12)
3. Two-way radio switch (N72s11)
4. PTS OFF switch (N72s13)
5. Level positioning switch (N72s18)
6. Comfort and sport switch (N72s25)

In addition

1. Reading in the DTR distance potentiometer (N72r1)
2. Actuation of the search/function illumination in the respective switches

The lower control panel control module (N72) is linked to the interior CAN for data exchange. The scanned states are sent as CAN messages over the interior CAN.

Bottom control panel control unit design - GF54.21-P-4116-02T

Design

Structure

Fundamentally, the lower control panel control module (N72) consists of the series block and both of the specially equipped blocks with the switches

1. DTR Distance potentiometer (N72r1)
2. DTR switch (N72s9)
3. Two-way radio switch (N72s11) (code 450)
4. PTS OFF switch (N72s13)
5. Level positioning switch (N72s18)
6. Comfort and sport switch (N72s25)

The built-in switches in the lower control panel control module (N72) have a search lighting and a partial function lighting.

Battery control unit, task - GF54.21-P-4121-02T

Task

The battery control unit (N82) measures the current and voltage of the battery (G1) as well as the temperature of the bus bar.

The temperature of the bus bar is used to determine the temperature of the battery (G1). The voltage of the auxiliary battery (G1/7) is also measured. This data and the history of the battery are used to determine the working capacity of the battery (G1).

Together with the data of the overall vehicle, which is received by the interior CAN, the following measures are implemented for stabilization of the on-board electrical system

1. Consumer group 1 switched off
2. Consumer group 2 switched off
3. Accessory socket switched off
4. Idle speed increase
5. Auxiliary battery (G1/7) cuts in for limp-home mode
6. Instability of vehicle power supply is displayed

The display in the instrument cluster (A1) informs the driver if a consumer group is switched off or if the vehicle power supply is unstable.

Rain sensor/light sensor, function - GF54.21-P-4123-04Q

Presentation of function overview of rain/light sensor

Identifying Infrared Transmitter And IR Receiver. Scheme 62

Function principle

Function requirements

1. Circuit 15R ON

Function principle

Infrared light is radiated from the IR transmitter unit (2) and guided to the windshield (4) via the lens (1). The intensity of the light reflected at the windshield (4) is measured by the IR-receiver unit (3) which is located at the other end of the lens (1)

1. The windshield (4) is dry (Fig. A) If the windshield is dry in the area of the rain/light sensor, the light is almost completely reflected: the IR receiver unit (3) measures a high light intensity.
2. Windshield (4) is wet (Fig.B) If there is moisture on the windshield (4) in the area of the reflection surface, part of the light is diffused from the glass on to the windshield (4). As a result the intensity of the reflected light reduces: the IR receiver unit (3) measures a lower light intensity. The light intensity measured by the IR receiver (3) is a measure for the quantity of water on the windshield (4) The smaller the measured intensity the larger the quantity of water on the windshield (4).

Reading out via the rain/light sensor

The rain/light is connected with the interior CAN via the overhead control panel control module as interface

The front SAM control module with fuse and relay module (model 209) or driver-side SAM control module with fuse and relay module (model 211) or left front SAM control module (models 215, 220) transmits a request to the rain/light sensor via the interior CAN, this then conveys the instantaneous degree of wetting for each request.

The automatic driving light actuation actuates the low beam in the following cases

1. Dusk
2. Darkness
3. Driving through tunnels

and in the case of a detected sensor failure.

The above-mentioned switch-on conditions are considered separately and the driving lights are switched on when at least one of the conditions is met.

A detection of fog is not recognized. In fog the driving lights must continue to be switched on manually

Measurement and compensation

Via the serial interface the rain/light sensor receives information as to which wiper system it should actuate (reversing wiper system or two-stage), or whether the driving light should be switched on and emits the signals necessary for actuation

Data link connector, design - GF54.22-P-2100-02T

The data link connector (X11/4) is a 16-pin connector with a plastic housing.

Pin assignment of data link connector (X11/4)

Instrument cluster (IC), function - GF54.30-P-0002T

MODEL 211.0 /2 up to 31.5.06 except CODE (494) USA version except CODE (498) Japan version

MODEL 211.0 /2 up to 30.6.06 with CODE (494) USA version with CODE (498) Japan version

Instrument cluster, function

Instrument cluster (A1) provides a visual display of all the dynamic and static vehicle states and driver information relating to all the systems fitted to the vehicle

1. Displays the operating states of the vehicle, e.g. speed, fuel level, coolant temperature, engine speed.
2. for warning of critical operating states by means of warning and malfunction indicator lamps
3. central display for various systems, e.g. audio, telephone.
4. display for the "Active Service System PLUS" (ASSYST PLUS).
5. Trip computer (TRIP)

The instrument cluster (A1) has a multifunction display (A1p13), various display instruments as well as various warning and indicator lamps for a visual display of these states. The instrument cluster (A1) has the warning buzzer (A1h1) as well as the audible turn signal indicator (A1h2) for chimes. For the Controller Area Network bus Class C (engine compartment) (CAN-C) or the Controller Area Network bus Class B (interior) (CAN-B) various signals, e.g. vehicle speed are generated and passed on by the instrument cluster (A1). The required information is passed on to the instrument cluster (A1) from various control units via CAN C or CAN B, except the signal for the airbag indicator and warning lamp (A1e15). This signal is transmitted via a discreet line.

The instrument cluster (A1) displays a warning when the remaining distance or the remaining time to the next service is reached. The instrument cluster (A1) informs the driver about an imminent service appointment or one which has already been overrun in the form of a warning message. Irrespective of this the vehicle user can have displayed in the service menu in certain operating conditions of the vehicle this and other information upon inquiry at the instrument cluster (A1).

The instrument cluster (A1) contains a microprocessor to process the incoming data. The program required for processing the data is stored in an electronic memory module. With the multifunction steering wheel (MFL) various menu items can be actuated using the system selection button (S110s3) and the scroll forward/back button (S110s1).

Diagnosis takes place via STAR DIAGNOSIS

Identifying Instrument Cluster Operating Information - Illustrated Up To 31.5.05. Scheme 63

Illustrated up to 31.5.05

Identifying Instrument Cluster Operating Information - Shown As Of 1.6.05. Scheme 64

Shown as of 1.6.05

Multifunction steering wheel (MFL), controls

Identifying Multifunction Steering Wheel Button Location. Scheme 65

This document covers the following points

1. Operating the multifunction display (A1p13)
2. Call display of different systems
3. Browse within a system
4. Individual settings
5. Change settings
6. Example: Switching over from degrees centigrade to degrees Fahrenheit (up to 31.5.05)
7. Recall the factory settings
8. Call stored fault and warning messages
9. Acknowledge fault and warning messages on the multifunction display (A1p13)
10. Set brightness of lighting
11. Switch on ESP rolling test

Operating the multifunction display (A1p13)

If the instrument cluster (A1) is activated, by opening the driver's door for example, the basic display of the basic system (trip odometer and total mileage, outside temperature) always appears on the multifunction display (A1p13).

Calling up display of different systems

Function requirements

1. Circuit 15R ON
2. No undervoltage or overvoltage

If the system selection button (S110s3) on the multifunction steering wheel (MFL) is pressed, the multifunction display (A1p13) switches over to the basic display of the next system. Once the driver has scrolled through all systems the main screen of the base function appears again.

System selection via the multifunction steering wheel using the system selection button (S110s3)

Identifying Steering Wheel Selection Button. Scheme 66

The illustration above shows the possible systems arranged in a circle. When the system selection button (S110s3) is pressed, the display always moves quickly on to the next system.

Scrolling within a system

Function requirements

1. Circuit 15R ON
2. No undervoltage or overvoltage

In addition to the main screen, most systems also feature other screens. Scrolling within a system takes place via the scroll forward/back button (S110s1) (↑, ↓). The display moves on further each time the scroll forward/back button (S110s1) (↑, ↓) is pressed.

The display scrolls either forwards or backwards depending on which portion of the scroll forward/back pushbutton (S110s1) the driver presses (↑, ↓).

You can jump to another system from any screen by pressing the system selection button (S110s3). With the exception of the trip computer (RRE) the basic display of this system then appears. If a change is made from the previous system to the trip computer system, the display screen is always called up which was shown last with the trip computer (RRE) system

The display only shows systems and functions available in the particular vehicle. If a system is not available, it is "skipped" by pressing the system selection button (S110s3)

Overview and sequence of Menu item "Settings"

Overview And Sequence Of Menu Item "Settings". Scheme 67

Individual settings

Function requirements

1. Circuit 15R ON No undervoltage or overvoltage

The "Settings" function allows the driver to change various presets. Various settings can be performed in the instrument cluster (A1), e.g. setting the time (hours and minutes).

The time cannot be set if one of the following codes is available

1. with code (494) USA version
2. with CODE (498) Japanese version
3. with code (352) COMAND operating and display system
4. with code (527) COMAND APS (with navigation)

The time is set automatically with the help of satellites on vehicles with the above codes

Press the system selection button (S110s3) until the menu "Settings... reset: press reset button for 3 seconds" appears on the multifunction display (A1p13). via the scroll forward/back button (S110s1)

(↑, ↓) Go to the menu item settings. The desired menu item is selected via the + and - button, adjustment of specific functions and volume control (S111s1).

The following settings are possible, for example

1. Automatic door locking (ON/OFF)
2. Winter tire speed limit (160 km/h up to 210 km/h or Off)
3. Driving light switching (manual driving light, automatic driving light
4. Ambient illumination function
5. Headlamp delayed switch-off (0 s/15 s/30 s/45 s/60 s) (up to 31.5.05) (ON/OFF) (ON = 15 s) (as of 1.6.05)
6. Locator lighting (AFB)
7. "Ambient" light
8. Interior light courtesy delay (0 s/5 s/10 s/15 s/20 s) (up to 31.5.05) (ON/OFF) (ON = 10 s) (as of 1.6.05)
9. Station search (frequency/memory)
10. Stationary heater activation time
11. Activate entry aid (OFF/steering column/steering column and seat) (up to 31.5.05) (OFF/steering column) (as of 1.6.05)
12. Parking assist mirror adjustment (ON/OFF)
13. Folding mirror, in/out (ON/OFF) (up to 31.5.05) (USA = ON, except USA = OFF) (as of 1.6.05)

Overview and sequence of settings for the menu item "Instrument cluster"

Scheme 68

Change setting in menu item "Instrument Cluster"

Press the system selection button (S110s3) until the "settings" function appears on the multifunction display (A1p13), go to the corresponding menu item using the scroll forward/back button (S110s1) (↑, darr;). Press the button + and -, setting of specific functions and volume control (S111s1) towards (+) or (-) until the desired menu item is active on the multifunction display (A1p13). Press the scroll forward/back button (S110s1) (↑, ↓) until the display of the setting to be changed appears on the multifunction display (A1p13). Press the + -and -, specific function setting and volume control button (S111s1) in either the "+-" or "-" direction until the value you require is displayed on the multifunction display. A1p13 The activated value becomes effective immediately.

Temperature display (up to 31.5.05)

You can switch the outside temperature display between degrees Centigrade and degrees Fahrenheit. The instrument cluster (A1) also sends a message for the air conditioning on the class B (interior) controller area network bus (CAN-B).

As of 1.6.05 the temperature display is established via variant coding in the central gateway control unit (N93)

Text/language

The language in which the texts appear in the instrument cluster (A1) can be selected here. The instrument cluster (A1) also places a corresponding message on CAN-B. The voice setting on the "radio" does not have an effect on the voice setting in the instrument cluster (A1).

Speedometer

You can switch the tachometer between miles and kilometers per hour. This changeover also affects the display of the trip computer integrated into the instrument cluster (A1). The instrument cluster (A1) sends a message on the class C (engine compartment) controller area network bus (CAN-C).

Overview and sequence of settings in the menu item "Illumination"

Overview And Sequence Of Settings In Menu Item "Illumination". Scheme 69

Change setting in the menu item "Illumination"

Press the system selection button (S110s3) until the "Settings" function appears on the multifunction display (A1p13), go to the corresponding menu item using the scroll forward/back button (S110s1) (↑, ↓). Press pushbutton + and -, setting specific functions and volume control (S111s1) in the (+) or (-) direction until the desired menu item "Lighting" is active on the multifunction display (A1p13)

Press the scroll forward/back button (S110s1) (↑, ↓) until the display of the setting to be changed appears on the multifunction display (A1p13). Press the +- and -, specific function setting and volume control button (S111s1) in either the "+-" or "-" direction until the value you require is displayed on the multifunction display. A1p13 The activated value becomes effective immediately.

Overview and sequence of settings in the menu item "Vehicle"

Scheme 70

Change setting in the menu item "Vehicle"

Press the system selection button (S110s3) until the "settings" function appears on the multifunction display (A1p13), go to the corresponding menu item using the scroll forward/back button (S110s1) (↑, ↓). Press pushbutton + and -, setting specific functions and volume control (S111s1) in the (+) or (-) direction until the desired menu item "Vehicle" is active on the multifunction display (A1p13)

Press the scroll forward/back button (S110s1) (↑, ↓) until the display of the setting to be changed appears on the multifunction display (A1p13). Press the + - and -, specific function setting and volume control button (S111s1) in either the "+-" or "-" direction until the value you require is displayed on the multifunction display.A1p13 The activated value becomes effective immediately.

Overview and sequence of settings in the menu item "Comfort"

Overview And Sequence Of Settings In Menu Item "Comfort". Scheme 71

Change setting in menu item "Comfort"

Press the system selection button (S110s3) until the "Settings" function appears on the multifunction display (A1p13), go to the corresponding menu item using the scroll forward/back button (S110s1) (↑, ↓). Press pushbutton + and -, setting specific functions and volume control (S111s1) in the (+) or (-) direction until the desired menu item "Comfort" is active on the multifunction display (A1p13), Press the scroll forward/back button (S110s1) (↑, ↓) until the display of the setting to be changed appears on the multifunction display (A1p13). Press the + -and -, specific function setting and volume control button (S111s1) in either the "+-" or "-" direction until the value you require is displayed on the multifunction display.A1p13 The activated value becomes effective immediately.

Settings are selectable regardless of the vehicle speed

Example: Switching over from degrees Centigrade to degrees Fahrenheit (up to 31.5.05)

Press the system selection button (S110s3) until the "settings" function appears on the multifunction display (A1p13), go to the corresponding menu item using the scroll forward/back button (S110s1) (↑, ↓). Press the button + and -, setting of specific functions and volume control (S111s1) towards (+) or (-) until the desired menu item "Instrument cluster" is active on the multifunction display (A1p13). Press the scroll forward/back button (S110s1) (↑, ↓) until the display "TEMPERATURE DISPLAY" appears on the multifunction display (A1p13). Press the button + and -, setting of specific functions and volume control (S111s1) towards (-) on the right-hand side of the steering wheel so that Fahrenheit is now active on the multifunction display (A1p13). The setting becomes effective immediately.

As 6.05 it is no longer possible for the user to change over from degrees Centigrade to degrees Fahrenheit

Recalling the factory settings

All the possible settings are erased and the manufacturer default setting reproduced by a "Reset".

Carry out reset

Press the system selection button (S110s3) until the "SETTINGS" function appears on the multifunction display (A1p13). Operate the instrument lighting dimmer and reset button (A1r1) for at least 3 s. "RESET SETTINGS, CONFIRMATION WITH RESET BUTTON" appears on the multifunction display (A1p13). Operate the instrument lighting dimmer and reset button (A1r1) once more within 5 s, all the settings are now reset to the factory setting. "RESET TO MANUFACTURER SETTING" appears on the multifunction display (A1p13). If the instrument illumination rheostat and reset button (A1r1) is not pressed within this 5 s, the display switches back to the basic display. The settings are not then reset.

If a reset is performed while driving, the setting menu "Driving lights on" in the "Illumination" menu and the setting menu "Speed limit (winter tires) in the "Vehicle" menu are not reset for safety reasons. The message "NOT ALL SETTINGS RESET TO DEFAULTS WHILE DRIVING" appears

Calling stored fault and warning messages

When the instrument cluster (A1) is active, you can scroll though the saved messages

1. Press the system selection button (S110s3) until the display "MESSAGES" appears on the multifunction display (A1p13) (as of 1.6.05)
2. Press the system selection button (S110s3) until the display "MESSAGES" appears on the multifunction display (A1p13) (as of 1.6.05)
3. Use the button + and -, setting of specific functions and volume control (S111s1) to scroll through the fault messages. The messages are displayed in the order in which they were acknowledged.

Acknowledging fault and warning messages

These messages are divided into 3 categories according to their priority. Messages in categories 2 and 3 on the multifunction display (A1p13) can be acknowledges by pressing the Instrument illumination rheostat and reset button (A1r1) as well as with the system selection button (S110s3) of the multifunction steering wheel and then stored in the fault memory. On the other hand messages in category 1 (top priority) cannot be acknowledged. Indicator or warning lamps that light up at the same time cannot be acknowledged.

Certain fault and warning messages are also accompanied by a chime. A signal always sounds when faults and warning messages are displayed. For example "close trunk lid" belongs to the fault messages and warning messages

The fault messages and warning messages are not stored in the fault memory

Setting illumination brightness

Using the instrument illumination rheostat and reset button (A1r1) the brightness of the illumination of the instrument cluster (A1) as well as the controls and switch illumination can be adapted to the individual needs

1. Turning to the right --> brighter
2. Turn to the left --> dimmer

Switch on ESP rolling test

Function prerequisites

1. Circuit 15R ON
2. No undervoltage or overvoltage

In the rolling test, the rotational speeds of the driven axle are mirrored on the non-driven axle. To do this

1. Adjust the standard display (basic condition with current total mileage and trip odometer and outside temperature).
2. Keep the instrument illumination rheostat and reset button (A1r1) pressed for approx. 20 s to 30 s or 3 times within 2.5 s until the beep is audible.
3. Press the scroll forward/back button (S110s1) once in the (↑) direction. The rolling test display appears.
4. Switch on rolling test using the + and -, specific function setting and volume control button (S111s1). The dynamometer test remains active, even if "circuit 15R ON" has been switched off in the meantime until it is switched off with the button + and -, setting of specific functions and volume control (S111s1).

Instrument cluster (IC), networking of components - GF54.30-P-0002-06T

Function overview

The instrument cluster (A1) is networked with the engine compartment CAN and the interior CAN. Data is exchanged with virtually all the control units over the two bus systems.

However, the instrument cluster (A1) does not act as an interface (gateway) between the two data bus systems. This function is reserved for the central gateway control unit (N93)

This document lists the principal CAN messages for the functions of the instrument cluster (A1) including the trip computer and ASSYST PLUS system.

The connections of the instrument cluster (A1) are described in the last part of this document.

The input signals are supplied by the following components

1. The wheel speeds from the ESP control unit (N47-5) via the CAN engine compartment
2. The engine speed signal from the ME-SFI [ME] control unit (N3/10) or CDI control unit (N3/9) via the engine compartment CAN
3. The shift range, selector lever position and transmission mode from the electronic selector lever module control unit (N15/5) or automated manual transmission control unit (N15/6) via the engine compartment CAN
4. The fuel level in the fuel tank from the rear SAM control unit with fuse and relay module (N10/2) via the interior CAN
5. The coolant temperature from the ME-SFI [ME] control unit (N3/10) or CDI control unit (N3/9) via the engine compartment CAN
6. The fuel-consumption signal from the ME-SFI [ME] control unit (N3/10) or CDI control unit (N3/9) via the engine compartment CAN
7. The oil level and oil temperature from the ME-SFI [ME] control unit (N3/10) or CDI control unit (N3/9) via the engine compartment CAN
8. The outside temperature signal from the driver-side SAM control unit with fuse and relay module (N10/1) via the interior CAN
9. The standing lamps ON/OFF signal from the driver-side SAM control unit with fuse and relay module (N10/1) via the interior CAN
10. The coolant level from the driver-side SAM control unit with fuse and relay module (N10/1) via the interior CAN
11. The washer fluid level from the driver-side SAM control unit with fuse and relay module (N10/1) via the interior CAN
12. Tire pressure from the TPM [RDK] control unit (N88) via the interior CAN
13. the time via the interior CAN from the audio gateway control unit (N93/1) and the latter via MOST from the COMAND operating, display and control unit (A40/3); on vehicles fitted with COMAND
14. The "circuit 15R ON" and "circuit 15c" status from the EIS [EZS] control unit (N73) via the interior CAN
15. The left multifunction steering wheel button group (S110) and right multifunction steering wheel button group (S111) on the multifunction steering wheel.

The following input signals are required for indicator and warning lamps

1. Signal for left turn signal indicator lamp (A1e1) and right turn signal indicator lamp (A1e2)
2. Signal for high beam indicator lamp (A1e3) from the driver-side SAM control unit with fuse and relay module (N10/1) via the interior CAN, for turn signals from the steering column module (N80) via the interior CAN, for hazard warning flashers from lower control panel control unit (N72) via the interior CAN, for ATA flashing from driver-side SAM control unit with fuse and relay module (N10/1) via the interior CAN
3. Signal for brake fluid and parking brake warning lamp (A1e7) from the driver-side SAM control unit with fuse and relay module (N10/1) via the interior CAN
4. Signal for ESP and ABS warning lamp (A1e41) from ESP control unit (N47-5) via engine compartment CAN
5. Signal for tire pressure monitor warning lamp (A1e66) from the TPM [RDK] control unit (N88) via the CAN interior
6. Seat belt warning lamp (A1e9) from the driver-side front seat adjustment control unit with memory (N32/1) and front passenger front seat adjustment control unit with memory (N32/2) via the CAN interior
7. Signal for engine diagnosis indicator lamp (A1e58) or CHECK ENGINE indicator lamp (A1e26) from ME-SFI [ME] control unit (N3/10) or CDI control unit (N3/9) via engine compartment CAN
8. Signal for DTR warning lamp (A1e59) from DTR control unit (N63/1) via engine compartment CAN

The airbag indicator and warning lamp (A1e15) is not actuated via the CAN bus but via a discreet line

Reception messages for the multifunction display (A1p13)

All the signals for the messages in the multifunction display (A1p13) are received over the engine compartment CAN or interior CAN.

Information about the signal paths and other details concerning the individual messages can be found in the function descriptions for the relevant systems.

The following transmitted messages are sent by the instrument cluster (A1)

1. Displayed speed to passenger compartment CAN
2. Current time to the interior CAN
3. Temperature units (Celsius and Fahrenheit) to the interior CAN.
4. Headlamp switching manual/always-on (ON/OFF) to the interior CAN.
5. Interior light courtesy delay to the interior CAN
6. Headlamp switch-off delay to the interior CAN
7. Outside temperature signal to the engine compartment CAN
8. "Terminal 58d" to the CAN engine compartment and CAN interior
9. "Terminal 61e" to the CAN engine compartment
10. Engine OFF time to the engine compartment CAN.
11. Winter tires maximum speed to the engine compartment CAN.

CAN messages of pushbuttons of multifunction steering wheel

In view of the fact that the pushbuttons of the multifunction steering wheel perform several functions, the signals of these pushbuttons must be conditioned accordingly

1. All the buttons of the left multifunction steering wheel button group (S110) and the right multifunction steering wheel button group (S111) are voltage-coded and are read in by the steering column module (N80).
2. The steering column module (N80) passes the relevant messages on the interior CAN.
3. These CAN messages are received by the instrument cluster (A1). On vehicles with model designation 211.067 and 211.267, the messages from the steering wheel gear shifter MINUS (S110/1) and steering wheel gear shifter PLUS (S111/1) switches are received by the electronic selector lever module control unit (N15/5). The electronic selector lever module control unit (N15/5) processes these messages and sends CAN messages with the gear and transmission mode information to the instrument cluster (A1).
4. The instrument cluster (A1) interprets these messages in combination with the systems displayed at that moment in the multifunction display (A1p13) and puts these interpreted messages as a message back on the interior CAN.

This interpretation is necessary as the function of certain pushbuttons depends on the current contents of the multifunction display

Example

If the driver presses the + and -, specific function setting and volume control button (S111s1) of the multifunction steering wheel, this usually increases the volume. However, if the multifunction display (A1p13) is currently displaying another setting such as the interior light courtesy delay, this setting is changed when the driver presses the "+" pushbutton. The volume stays the same.

Connections

Linking the instrument cluster (A1) to the engine compartment CAN and the interior CAN has reduced the number of inputs and outputs.

The inputs and outputs (including voltage supply) are at the following connections

1. CAN-C Low (engine compartment CAN)
2. CAN-C high (engine compartment CAN)
3. CAN-B Low (passenger compartment CAN)
4. CAN-B high (interior CAN)
5. "Circuit 31" (ground)
6. "Terminal 30" (battery positive, supplies voltage to almost all the electronics of the instrument cluster (A1)).
7. "Terminal 15g" (switched positive, serves the airbag indicator and warning lamp (A1e15) and diagnostic interface of the instrument cluster (A1) as a voltage supply)
8. Clock GND, ground to external clock module.
9. "Terminal 15g" control input for limp-home
10. Clock supply, output and battery.
11. Data line for external clock.
12. Input for airbag indicator and warning lamp (A1e15); this input is directly connected to the corresponding output of the restraint systems control unit (N2/7)

Instrument cluster activation, function - GF54.30-P-2006T

MODEL 211.0 /2 up to 31.5.06 except CODE (494) USA version except CODE (498) Japan version

MODEL 211.0 /2 up to 30.6.06 with CODE (494) USA version with CODE (498) Japan version

Instrument Cluster Activation - Communication Diagram. Scheme 72

Activating the instrument cluster (A1)

Due to the Black-Screen technology the instrument cluster details (A1) (e.g. displays, display instruments) are only clearly visible when the instrument cluster (A1) is activated. If the instrument cluster (A1) is activated, the current contents are shown in the displays, the illumination of the instrument cluster (A1) is switched on and the fuel reserve indicator lamp (A1e4) is actuated.

The instrument cluster (A1) is activated by switching on "Circuit 15g". Once "Circuit 15g" is switched off "circuit 15g" the instrument cluster (A1) remains active for a further 30 s, but this period can be extended to 2 minutes in the event of active warnings occurring.

The instrument cluster (A1) is activated under the following conditions with "circuit 15g OFF"

1. By pressing the instrument illumination rheostat and reset button (A1r1) the instrument cluster (A1) is activated for 30 s
2. The instrument cluster (A1) is activated for 30 s by opening or closing the driver's door
3. When the standing lamp or driving lamps are switched on the instrument cluster (A1) remains in operation as long as the standing lamp is switched on If one of the stated conditions occurs whilst the instrument cluster (A1) is already active, then the instrument cluster (A1) remains activated for a further 30 seconds from this point in time. The instrument cluster (A1) cannot be operated using the buttons of the multifunction steering wheel (MFL).

Networking

The status of the left front door contact switch (S17/3) (on left-hand drive vehicles) or of the right front door contact switch (S17/4) (on right-hand drive vehicles) is read in by the rear SAM control unit with fuse and relay module (N10/2) and placed on the Controller Area Network bus Class B (interior) (CAN-B) as a Controller Area Network (data bus/CAN bus) message.

The status of the standing lamp "ON/OFF" is placed on CAN B by the driver-side SAM control unit with fuse and relay module (N10/1).

Instrument cluster illumination, function - GF54.30-P-2007T

MODEL 211.0 /2 up to 31.5.06 except CODE (494) USA version except CODE (498) Japan version

MODEL 211.0 /2 up to 30.6.06 with CODE (494) USA version with CODE (498) Japan version

Activating instrument cluster lighting

The illumination of the instrument cluster (A1) switches on automatically when activated. The details of the instrument cluster (A1) are only now clearly visible due to the Black-Screen technology. The instrument cluster (A1) is activated when the following events occur

1. Controller Area Network (data bus/CAN bus) (CAN) message "standing lamps ON"
2. Circuit 15R ON
3. user input at the trip odometer reset button (A1s3)
4. Driver door is opened
5. Driver door is closed

The intensity of the lighting is dependent on

1. The CAN message from the rain/light sensor (B38/2)
2. the status of "circuit 58d" (standing lamp information)
3. The position of the instrument illumination brightness control and reset button (A1r1)

Controlling the display lighting

With the CAN message "standing lamp ON" the current position of the instrument illumination brightness control and reset button (A1r1) is transmitted via the Controller Area network bus Class B (interior) (CAN B). In this state, the signal from the rain/light sensor (B38/2) via the overhead control panel control unit (N70) is disregarded.

Controlling display lighting by means of sensor

"Circuit 58d" is set to 0 % by the CAN message "Standing lamp OFF". Because of this, the CAN message from the rain/light sensor (B38/2) via the overhead control panel control unit (N70) is processed as a control variable and converted.

The intensity of the display is dependent only on the ambient brightness detected by the rain/light sensor (B38/2). In the event of a defect in the rain/light sensor (B38/2) "Circuit 58d" is set to 100 % by the overhead control panel control unit (N70) The display brightness is now adjustable via the instrument illumination brightness control and reset button (A1r1).

Setting pushbutton unit illumination, function - GF54.30-P-2010T

MODEL 211.0 /2 up to 31.5.06 except CODE (494) USA version except CODE (498) Japan version

MODEL 211.0 /2 up to 30.6.06 with CODE (494) USA version with CODE (498) Japan version

Data flow image for circuit 58d

Scheme 73

Function requirements

The switch and controls illumination is activated by the following components

1. Switching on the vehicle lighting (as long as the standing lamp is active)
2. With the automatic driving lamps via the rain/light sensor (B38/2) and "AUTO" position of the rotary light switch (S1)

When the standing lamp switched on the position of the instrument illumination brightness control and reset button (A1r1) is used as a controlled variable by the overhead control panel control unit (N70), the rain/light sensor (B38/2) is not taken into account. If automatic running lights are set the intensity of the switch and controls illumination is determined by the rain/light sensor (B38/2). Its signals are evaluated by the overhead control panel control unit (N70) and placed on the Controller Area Network bus Class B (interior) (CAN-B).

All the control units which require the signal from the rain/light sensor (B38/2) pick up the signal from CAN-B.

Presentation of duty cycle

Presentation Of Duty Cycle. Scheme 74

Terminal 58d on/off ratio

The lamps of the switch and controls illumination are actuated by means of a square-wave voltage U 58d (see top illustration)

1. The lamps are energized for the period (t 1 ),followed by a break. After the pause they are energized again, and so on. The change occurs so quickly as to remain imperceptible to the human eye.
2. The ratio of times t 1 to T is called the duty cycle. where T is the constant cycle duration and t 1 is the time during which power flows during a cycle.
3. The greater the duty cycle (that is to say the power flow duration t 1 )), the greater the average power and therefore the brighter the lamps.

The voltage curve U 58d is sketched in the illustration as it is applied to the outputs "Circuit 58d" of the various control units. The upper sketch shows a duty cycle of 80 %, the lower a duty cycle of 40 %. A duty cycle of 100 % corresponds to normal direct voltage.

Power is not supplied when the duty cycle is 0 %. Advantages of this type of illumination adjustment

1. Greater efficiency
2. the intensity of the illumination provided by the lamps remains independent of the number of lamps
3. Each control unit which is connected to the CAN-B o Controller Area Network bus Class C (engine compartment) (CAN-C) and actuates lamps, actuates these lamps with the brightness specified by the instrument cluster (A1) When the standing lamp is "OFF" the instrument cluster (A1) transmits the message "duty cycle circuit 58d = 0 %". When the standing lamp is "ON" the transmitted duty cycle is adjusted in the range of 12 to 100 % using the instrument illumination brightness control and reset button (A1r1).

Function to display malfunction/warning indication via indication lights - GF54.30-P-2011T

MODELS 211.0/ 2

Scheme 75

Illustrated up to 31.5.05

Identifying Warning Indication Lights Function Display - Illustrated Up To 31.5.05. Scheme 76

Shown as of 1.6.05

Turn signal indicator lamps

The left turn signal indicator lamp (A1e1) and right turn signal indicator lamp (A1e2) is integrated in the instrument cluster (A1) for an optical check. These are activated differently according to function. During operation as directional indicators only one of the two indicator lamps is triggered. The signal for actuating the respective indicator lamp comes from the steering column module (N80) to the rear SAM control unit with fuse and relay module (N10/2) via the Controller Area Network bus Class B (interior) CAN B. In the event of the failure of a turn signal lamp the corresponding indicator lamp in the instrument cluster (A1) is actuated at twice the frequency. With hazard warning flashing and with antitheft alarm system (ATA [EDW]) flashing, the left turn signal indicator lamp (A1e1) and right turn signal indicator lamp (A1e2) are actuated. The request for the hazard warning system is output by the upper control panel control unit (N72/1) after the hazard warning system switch (N72/1s5) is pressed.

The signal for actuating the warning lamps in the hazard warning system switch (N72/1s5) comes from the rear SAM control unit with fuse and relay module (N10/2) via CAN B. The signal to actuate the ATA flashing comes from the rear SAM control unit with fuse and relay module (N10/2) via CAN B.

While direction signaling is only possible when circuit 15 is switched ON, the other types of turn signal modes are also possible when circuit 15 is switched OFF. An acoustic signal accompanies the rhythmic flashing of the indicator lamp (A1h2)

When different demands for flasher operation are present, the system assigns hierarchical priorities in the following sequence

1. Electronic alarm system flashers (highest priority)
2. Hazard warning flashers (2nd priority)
3. Turn indicators (3rd priority)

The turn signal confirmation when unlocking or locking the vehicle is handled like hazard warning flashing

High beam indicator lamp (A1e3)

With "High beam ON" and headlamp flasher the actuation takes place by the driver-side SAM control unit with fuse and relay module (N10/1) via CAN B.

Low beam indicator lamp (A1e67) as of 1.6.05

After receipt of the message via CAN B with "low beam ON" the actuation takes place by the driver-side SAM control unit with fuse and relay module.

Fuel reserve indicator lamp (A1e4)

The fuel reserve indicator lamp (A1e4) lights up when the fuel level sinks to the reserve level. Control of this lamp is linked to the fuel level and reserve gage (A1p2).

Brake fluid and parking brake warning lamp (A1e7)

This warning lamp is actuated if the parking brake is not released at the start of a journey or the brake fluid drops below the minimum level.

The signal for actuating the brake fluid and parking brake warning lamp (A1e7) comes from the Driver-side SAM control unit with fuse and relay module (N10/1) via CAN B.

Fasten seat belts warning lamp (A1e9)

The seat belt warning light (A1e9) is not installed in all national versions.

Version Warning lamp "ON" Warning tone "ON"

ECE t = 6 s from engine operation t = 93 s from engine operation

USA t = 6 s from engine operation t = 6 s from engine operation

Japan t = 6 s from "circuit 15 ON" t = 6 s from "circuit 15 ON"

On the driver's side a seat belt buckle which is not inserted is detected by the driver seat belt buckle and seat belt warning switch (S68/1). The warning tone sounds for t = 6 s. It ends sooner if during this time the driver seat belt buckle and seat belt warning switch (S68/1) a seat belt buckle which has been inserted.

The seat belt warning lamp lights up when the circuit status is "Circuit 61 ON", the vehicle speed is >25 km/h, the front passenger seat occupied and child seat recognition sensor (B48) has detected a person or a child seat and the Front passenger seat belt buckle restraint systems switch (S68/4) is not closed. The seat belt warning lamp (A1e9) goes out as soon as the Front passenger seat belt buckle restraint systems switch (S68/4) is closed.

In the USA seat occupation is detected by the WSS (Weight Sensing System) control unit (N2/13)

Safety system lamps

The airbag indicator and warning lamp (A1e15) is triggered when there is a fault in the supplemental restraint system (SRS). It is triggered directly by the restraint systems control unit (N2/7). The ABS indicator lamp (A1e17) is actuated if there is a fault in the antilock brake system (ABS).

The signal for actuating the lamp comes from the ESP, SPS [PML] and BAS control unit (N47-5) via the Controller Area Network bus Class C (engine compartment) (CAN C). Depending on country variant, vehicles are equipped with either the engine diagnosis malfunction indicator lamp (A1e58) or the CHECK ENGINE malfunction indicator lamp (A1e26). The lamp is actuated if there is a fault in the injection system, the ignition system or the exhaust emission system. The signal for actuating the lamp comes from the CDI control unit (N3/9) or ME-SFI [ME] control unit (N3/10) via CAN C.

DTR warning lamp (A1e59)

The DTR warning lamp (A1e59) lights up white when a vehicle driving in front is detected. It lights up red if the safe distance is not maintained. An acoustic signal also sounds. The signal for actuating the lamp comes from the DTR control unit (N63/1) via CAN C.

Light sources

The high beam indicator lamp (A1e3), the low beam indicator lamp (A1e67) (as of 1.6.05) and the preglow indicator lamp (A1e16) are equipped with bulbs as the means of lighting. All other indicator and warning lamps in the instrument cluster (A1) are equipped with light emitting diodes (LED).

Tire pressure monitor warning lamp (A1e66)

In addition for an output on the multifunction display (A1p13) the tire pressure monitor warning lamp (A1e66) lights up yellow when a rapid pressure loss of > or = 0.2 bar/min is detected. The signal for actuating the lamp comes from the TPM [RDK] control unit (N88) via CAN B.

Apart from the actuations described above all the indicator and warning lamps are also actuated on the lamp test with the exception of the left turn signal indicator lamp (A1e1), right turn signal indicator lamp (A1e2) and high beam indicator lamp (A1e3). As of 1.6.05 the airbag indicator and warning lamp (A1e15) is likewise no longer actuated

Triggering and illumination of some indicator and warning lamps (such as the engine diagnosis indicator lamp A1e58) is accompanied by the appearance of a malfunction message in the right-side multifunction display (A1p13). While some categories of message can be acknowledged and canceled, the warning and indicator lamps remain on for as long as the problem remains present. These indications cannot be canceled!

Display monitoring/warning messages via multifunction display, function - GF54.30-P-2012T

MODELS 211.0/ 2

Function menu

Starting from the basic screen, the following views can be called up in the central status area using the System Selection pushbutton (S110s3) and the Forward/Back pushbuttons (S110s1)

1. Digital speedometer
2. Service required
3. Tire pressure
4. Check engine oil level
5. CNG (compressed natural gas) tank fill level display

Starting from the "Driving mode" basic display described various setting menus and information menus can be switched through on the multifunction display (A1p13) by changing the display level using the system selection button (S110s3) on the Multifunction steering wheel (MFL).

The information is always displayed in the central status area of the multifunction display (A1p13). Only those functions that are actually installed in the vehicle will be displayed

1. Audio displays
2. Radio
3. CD/CC
4. TV tuner (except )
5. Navigation
6. Distronic (Autonomous intelligent cruise control) (DTR)
7. Vehicle configuration
8. Telephone display
9. Taxi functions
10. Telematik/Telematic Alarm Identification on Demand (only )
11. Trip computer (TRIP)
12. Fault and warning messages

Partitioning of displays

The lower status area consists of the gear indicator (A1p12) and transmission mode display (A1p16) which are located as follows

1. The selected transmission mode is displayed on the left
2. The selected drive position used is displayed on the right

The center status area consists of the multifunction display (A1p13). In the basic screen layout, the outside temperature and the trip odometer are displayed in this area; the display can be configured.

Display priority

Which displays and functions appear depends on the current situation and priority. The instrument cluster (A1) differentiates between the primary and secondary priority of each message. The multifunction display (A1p13) first shows the messages in the sequence of the respective main priority. If there are several equal messages, the value of the sub-priority decides the display sequence.

New messages have the highest priority. After it has been displayed once, the message is entered in the display sequence. The messages are divided into the following three categories according to their priority.

1. Messages of the highest priority belong to category 1. These messages cannot be acknowledged. When they occur, a brief warning tone is sounded. Any errors of categories 2 and 3 are hidden.
2. Messages of medium priority belong to category 2. These messages can be acknowledged and canceled using the instrument illumination rheostat and reset knob (A1r1). When they occur, a brief warning tone is sounded. Any faults of category 3 are hidden.
3. Messages of the lowest priority belong to category 3. These messages can be acknowledged and canceled using the instrument illumination rheostat and reset knob (A1r1). There is no warning tone.

The method of functioning of the CNG fuel tank display for the engine M271 is described in detail in the CNG (compressed natural gas) system description

Fault storage

The messages are stored in 3 roll memories according to their priority

1. U roll
2. W roll
3. N roll

U roll

This is the directory of all unacknowledged warning messages displayed on the multifunction display (A1p13). Displays of the same of a higher priority are displayed once the minimum display time of the preceding message has elapsed. Once the minimum display time for the warning with the lowest secondary priority has elapsed the fault roll starts again with the warning with the highest main priority (ring memory).

W roll

This is where all the acknowledged errors that occurred while driving are entered. It can be called up as required from the menu tree on the multifunction display (A1p13). When the roll is called up, a start screen showing the number of errors that occurred is first displayed, followed by the errors in main priority sequence.

N roll

After disconnecting terminal 15R, all messages entered in the error roll are automatically called up in the N roll in secondary priority sequence. The number of errors entered in shown in the start screen. The warning buzzer (A1h1) sounds briefly when the start screen is displayed. The displayed messages must be acknowledged. The N roll stops when all the warnings have been acknowledged. If there are messages entered or if all the entered messages are acknowledged, the multifunction display (A1p13) is switched off after 30 s. If some messages have still not been acknowledged, the display will stay on for 2 minutes.

If the N roll is interrupted by a higher priority message, it starts again with the start screen.

Some messages (including dynamic curve illumination) are accompanied by the lighting of a warning or indicator lamp. These lamps remain lit until the fault is rectified. This applies even if the corresponding message was acknowledged

Acknowledging messages

Warning and error messages can be acknowledged automatically or manually. Manual acknowledgment takes place by pressing the steering wheel buttons, scroll forward/back button (S110s1) and System selection button (S110s3) or the instrument illumination rheostat and reset button (A1r1). If the cause of a message which can be acknowledged automatically is discontinued, the warning is displayed on the multifunction display (A1p13) for the duration if its minimum display time.

For faults, which are in addition displayed via an indicator lamp, the lamp is activated simultaneously with the message on the multifunction display (A1p13). The lamp remains actuated for as long as the fault exists, irrespective of whether the fault message on the multifunction display (A1p13) has already been acknowledged.

Acknowledgment of messages (as of 1.6.05)

The windshield washer fluid level is displayed as of the circuit status

"Circuit 15C ON" displayed and is acknowledged automatically after 5 s. Acknowledgment by pressing the steering wheel buttons, scroll forward/back button (S110s1) and system selection button (S110s3) or instrument illumination rheostat and reset button (A1r1) continues to be possible.

Reminder of acknowledged messages

If messages have been acknowledged while driving, when "Circuit 15R is ON" these are displayed once again as a reminder.

In the process current messages, e.g. lights on warning, hide this reminder function. If there are no messages, the main screen appears after "Terminal 15R ON".

Display stored error messages

When the instrument cluster (A1) is active, you can scroll though the saved messages

1. Press the system selection button (S110s3) until the display "(number of) PROBLEMS" appears on the multifunction display (A1p13) (up to 31.5.05)
2. Press the system selection button (S110s3) until the display "(number of) MESSAGES" appears on the multifunction display (A1p13) (as of 1.6.05)
3. Use the button + and -, setting of specific functions and volume control (S111s1) to scroll through the fault messages. The messages are displayed according to their priority.

Example

In order to inform the customer about the lower performance of the battery (G1), the message "electrical consumers switched off" appears on the multifunction display if the battery control unit (N82) detects a poor charge level.

Messages presented in white only have information functions. Consumers that do not impair driving safety are shut off until the overall state of the on-board electrical system has stabilized again

Consumer shutoff is apparent, amongst others, by the flashing of the indicator lamp belonging to the switched on heated rear window or heated seats

Message (white) in instrument cluster (A1)

1. "Malfunction - Electrical consumers switched off". The charge level of the battery (G1) is too low (consumer shutoff stage 1, fault code 9051).
2. "Malfunction - Electrical consumers switched off". The charge level of the battery (G1) is very low (consumer shutoff stage 2, fault code 9050).

Message (red) in instrument cluster (A1)

1. "Battery/alternator - go to garage + Electrical consumers switched off". The message of circuit status "Circuit 61 ON" does not exist as a message on the Controller Area Network bus Class B (interior) (CAN-B).
2. "Battery/alternator - go to garage + Electrical consumers switched off". The charge level of the battery (G1) is very low (backup battery < 10.5 V or line to the battery control unit (N82) is interrupted (short circuit), fault code 9092).

Consumer shutoff

The consumer shutoff is subdivided into the following 3 categories

1. Fault code 9051 (shutoff level 1)
2. Fault code 9050 (shutoff level 2)
3. Fault code 9092 (backup battery < 10.5 V or line to the battery control unit (N82) interrupted (short circuit))

The following systems are affected by the consumer shutoff (shutoff level 1, fault code 9051)

1. STH heater unit (A6)
2. Blower motor (A32m1) (reduced to 69 %)
3. Steering wheel heater electronics (A74)
4. Front left door warning lamp (E17/19)
5. Front right door warning lamp (E17/21)
6. Rear left door warning lamp (E17/20)
7. Rear right door warning lamp (E17/22)
8. left front door entrance and exit lamp (E17/3)
9. right front door entrance and exit lamp (E17/4)
10. left rear door entrance and exit lamp (E17/5)
11. right rear door entrance and exit lamp (E17/6)
12. SRA pump (M5/2)
13. Left front seat cushion ventilation motor group (M18/9)
14. Left front seat backrest ventilation motor group (M18/10)
15. Right front seat cushion ventilation motor group (M18/11)
16. Right front backrest ventilation motor group (M18/12)
17. Left front seat adjustment motor group with memory (M27)
18. Right front seat adjustment motor group with memory (M28)
19. Driver-side front seat adjustment control unit, with memory (N32/1)
20. Passenger-side front seat adjustment control unit with memory (N32/2)
21. Heated rear window (R1)
22. Left front seat heated cushion (R13/1)
23. Right front seat cushion heater element (R13/3)
24. Left front backrest heated cushion (R13/2)
25. Right front backrest seat cushion heater element (R13/4)
26. Left rear backrest heated cushion (R13/6)
27. Right rear backrest heated cushion (R13/8)
28. Left rear side piece heated cushion (R13/9)
29. Right rear side piece heated cushion (R13/10)

The following systems are affected by the consumer shutoff (shutoff level 2, fault code 9050)

1. Blower motor (A32m1) (reduced to 53 %)
2. left front reading lamp (N70e2)
3. right front reading lamp (N70e3)
4. Surround lamp (A67e3)
5. Rear interior lamp (E15/3)
6. right front footwell lamp (E17/15)
7. left front footwell lamp (E17/16)
8. right rear footwell lamp (E17/17)
9. left rear footwell lamp (E17/18)
10. Trunk lid drive motor (M51/2)
11. Left electrically adjustable and heated outside mirror (M21/1)
12. Right electrically adjustable and heated outside mirror (M21/2)
13. PTS control unit (N62)
14. Washer nozzle heating (R2/1)
15. Washer nozzle hose heater (R2/11)
16. Illuminated cigar lighter (R3)

Output acoustic warning messages, function - GF54.30-P-2013T

MODEL 211.0 /2 up to 31.5.06 except CODE (494) USA version except CODE (498) Japan version

MODEL 211.0 /2 up to 30.6.06 with CODE (494) USA version with CODE (498) Japan version

Acoustic warning function

The acoustic turn signal indicator (A1h2) is integrated within the instrument cluster (A1). It is a type of contactless relay.

The turn signal flasher is always accompanied by an acoustic clicking sound generated in the same rhythm. The acoustic turn signal/flasher (A1h2) function varies according to the type of signal.

Turn signals

The trigger signal for the acoustic turn signal function (A1h2) arrives through the interior compartment CAN after originating at the steering column module (N80). If one of the turn signals fails, the acoustic turn signal indicator (A1h2) operates at twice the usual frequency. The instrument cluster (A1) receives the turn signal lamp fault information from the control unit that triggers the faulty turn signal lamp via the interior compartment CAN.

Hazard warning flashers

The trigger signal for the acoustic turn signal indicator (A1h2) function arrives via the interior compartment CAN after originating in the control unit for the upper user-control panel (N72/1).

ELECTRONIC ALARM SYSTEM flashers

The signal to activate the acoustic turn signal indicator (A1h2) comes from the front SAM control unit with fuse and relay module, driver (N10/1) via the interior compartment CAN.

Warning signal

The instrument cluster (A1) has the warning buzzer (A1h1) which for various faults and operating conditions sounds for approx. 0.2 seconds at a frequency of approx. 2048 Hz.

An acoustic warning is given

1. with malfunction and warning messages with medium and top priority (in addition to the message that appears in the multifunction display (A1p13).
2. when the seat belt warning lamp (A1e9) lights up. This indicator lamp is not provided in all national markets. The signal to actuate comes from the restraint systems control unit (N2/7) via the interior compartment CAN.
3. The brake fluid level and parking brake warning lamp (A1e7) light up if the vehicle starts to move before the parking brake is released. The signal to activate this lamp comes from the front SAM control unit with fuse and relay module, driver (N10/1) via the interior compartment CAN.
4. When the DTR warning lamp (A1e59) lights up. This lamp is triggered when the distance to the preceding vehicle falls below the defined safety margin. The trigger signal is transmitted through the engine compartment CAN after originating with the DTR control unit (N63/1).
5. When the transmitter key (A8/1) is in the EIS [EZS] control unit (N73) with "circuit 15c" and the driver door is opened. The CAN messages "ignition key status information" and "ignition OFF" are present (over the interior compartment CAN from the EIS control unit (N73)) and the door contact signal from the rear SAM control unit with fuse and relay module (N10/2) is transmitted.
6. When the standing lamps are on, the ignition key (A8/1) is withdrawn and the driver door is open (lights warning).

The "ignition key status information" comes over the interior compartment CAN from the EIS control unit (N73) and the door contact signal from the rear SAM control unit with fuse and relay module (N10/2) and the standing lamps signal from the driver-side SAM control unit with fuse and relay module (N10/1) are present.

1. When vehicle speed exceeds 120 kph (Gulf states only). The warning tone is muted as soon as the speed drops below 117 km/h.

When the speed set on the variable speed limiter is exceeded, e.g. due to inertial acceleration.

The displayed speed is used. The specified maximum speed comes from the CDI control unit (N3/9) or the ME control unit (N3/10) via the engine compartment CAN.

Display fuel quantity, function - GF54.30-P-3018T

MODEL 211.0 /2 up to 31.5.06 except CODE (494) USA version except CODE (498) Japan version

MODEL 211.0 /2 up to 30.6.06 with CODE (494) USA version with CODE (498) Japan version

Networking

Scheme 77

Function

The fuel level and reserve gage (A1p2) is a 39-segment LCD bar graph indicator. The fuel level and reserve gage (A1p2) is switched on and off by the instrument cluster (A1).

The display readings are shown immediately after "Terminal 15 ON"; the display run-up is dampened, but the run-down is not. A hysteresis is implemented to prevent segment jittering of readings near the segment limits.

Fuel level gage sensor

The left fuel level sensor (B4/1) and right fuel level sensor (B4/2) measure the fuel level. The instrument cluster (A1) registers this percentage from the interior compartment CAN and uses this information as the basis for controlling the fuel level and low fuel display (A1p2) as well as the low fuel warning lamp (A1e4) as required.

Fuel level display

If the EIS [EZS] control unit (N73) is in the "Circuit 15 ON" position, the current tank capacity is displayed in the fuel level and reserve indicator (A1p2).

During refueling when the EIS [EZS] control unit (N73) is in position "circuit 15 ON", refueling is only detected (updating of the display) as of a replenishment quantity of at least 9 l. Once "circuit 15 ON" is switched on again the display is updated. There is always a delay before the display is updated. This inhibits fluctuations in the display, e.g. due to cornering.

Reserve range

If the reserve range (approx. 9 l) has been reached, the fuel reserve warning lamp (A1e4) lights up yellow when the engine is running.

The lamp is triggered with a delay period to prevent the lamp flickering.

The system responds to malfunctions by moving the needle in the fuel level and reserve gage (A1p2) to "0". The fuel reserve warning lamp (A1e4) does not come on

CNG (compressed natural gas) display for M271

Scheme 78

Function requirements

"Circuit 15 ON"

In vehicles with "gas version" other functions can be operated and additional information can be display on the instrument cluster (A1).

Data is exchanged between the ME-SFI [ME] control unit (N3/10) and the instrument cluster (A1) via CAN-C (engine compartment CAN).

CNG (compressed natural gas) tank fill level display

The "CNG tank fill level display" multifunction display can be accessed by pressing the system selection button (S110s3) in the base function.

The "CNG tank fill level display" multifunction display can be selected as soon as "circuit 15R ON" but a real fuel gauge is only displayed with "circuit 15 ON" and the driver can then choose between the gas and petrol operating mode

Display outside temperature, function - GF54.30-P-3019T

MODEL 211.0 /2 up to 31.5.06 except CODE (494) USA version except CODE (498) Japan version

MODEL 211.0 /2 up to 30.6.06 with CODE (494) USA version with CODE (498) Japan version

Scheme 79

Networking

Function requirements

The outside temperature display located in the right-side multifunction display (A1p13) indicates temperature based on the following information

1. The outside temperature reading
2. The vehicle speed signal
3. The coolant temperature
4. the engine running time

Displaying outside temperature

The instrument cluster (A1) processes this data and controls the display accordingly. Due to the dependency of the outside temperature indicator in the multifunctional display (A1p13) on vehicle speed, engine running time and coolant temperature when the vehicle is stationary or driving slowly the system prevents too high a temperature being displayed as can be caused by radiated engine heat for example.

The display behaves differently according to the coolant temperature and the engine running time.

Coolant temperature < 60°C

When the instrument cluster (A1) is activated the current measured outside temperature value is always displayed.

Coolant temperature > or = 60°C

As of circuit status "Circuit 15C ON" the temperature value measured last is stored and displayed for a maximum of 60 minutes. When the instrument cluster (A1) is activated the stored temperature value is displayed immediately. If the measured outside temperature falls below the stored value, the current measured temperature is displayed after 8 seconds. If the engine is off, the current outside temperature is displayed after six times the engine running time. In the process the preceding engine running time is taken as a basis, however for a maximum engine running time of 10 minutes.

Example

The preceding engine running time was 5 minutes. The delay period was then 6 times 5 minutes. The current temperature is thus only displayed after 30 minutes. If the engine running time was more than 10 minutes, a maximum of 10 minutes is taken into account when calculating the delay time. The maximum delay is thus 60 minutes.

When driving

When the vehicle is moving, the delay periods depend on the vehicle speed. At speeds above 45 km/h rising outside temperatures are displayed after a delay period of 1.5 minutes. At temperatures are displayed after a delay period of 1.5 minutes. At speeds of 20 km/h to 45 km/h rising outside temperatures are displayed after a delay period of 3 minutes. If the vehicle speed falls below 20 km/h, the display is only changed if the measured value falls.

Range

The display is -40°C up to 85°C or -40°F up to 185°F. The temperature is displayed in increments of 0.5°C or 1°F.

Changing over from degrees Centigrade to degrees Fahrenheit (up to 31.5.05)

The driver can switch between degrees Celsius and degrees Fahrenheit using the "Settings" function in the multifunction display (A1p13). The instrument cluster (A1) also sends a message for the air conditioning on the class B (interior) controller area network bus (CAN-B).

Temperature display (as of 1.6.05)

The outside temperature display can no longer be switched over between degrees centigrade and degrees Fahrenheit. The temperature display is determined via the variant coding in the central gateway control unit (N93).

Data for outside temperature

The outside temperature indicator temperature sensor (B14) changes its resistance according to the outside temperature. The sensor is a resistor which reduces its resistance as temperature increases. The resistance value of the outside temperature display temperature sensor (B14) is read in by the driver-side SAM control unit with fuse and relay module (N10/1) The driver-side SAM control unit with fuse and relay module (N10/1) converts the resistance value from the outside temperature indicator temperature sensor (B14) into a temperature value. This temperature value is placed on the CAN B by the driver-side SAM control unit with fuse and relay module (N10/1).

Vehicle speed signal

The following signals are read in by the SBC control unit (A7/3n1)

1. Left front rpm sensor (L6/1)
2. Right front rpm sensor (L6/2)
3. Left rear rpm sensor (L6/3)
4. Right rear rpm sensor (L6/4)

The SBC control unit (A7/3n1) places the 4 wheel speed signals on the Controller Area Network bus class C (engine compartment) (CANC) via the ESP control unit (N47-5). The instrument cluster (A1) uses these signals to calculate the speed.

Coolant temperature

The coolant temperature sensor (B11/4) changes its resistance according to the coolant temperature. (The sensor is an NTC resistor, i.e. its resistance decreases as the temperature rises.)

The resistance of the coolant temperature sensor (B11/4) is read by the CDI control unit (N3/9) or the ME-SFI control unit (N3/10). The ME control unit (N3/10) or CDI control unit (N3/9) converts the resistance values from the coolant temperature sensor (B11/4) into a temperature value. This temperature value is placed on the CAN C by the CDI control unit (N3/9) or ME-SFI [ME] control unit (N3/10).

Engine running time

The engine running time is calculated internally in the instrument cluster (A1) using the integral timer. The instrument cluster (A1) processes this data and controls the display accordingly.

Notes on diagnosis

If the display shows the lower temperature value -40°C or -40°F with a temperature value which is evidently higher, there may be a sensor fracture or cable open circuit. If the display indicates the maximum temperature value 85°C or 185°F although the actual outside temperature is obviously lower, this could indicate a short circuit in the sensor or in the line.

If the coolant temperature sensor (B11/4) is defective and a valid coolant temperature is not passed on from the CAN-C, processing moves to the range for coolant temperature 60°C

Display coolant temperature, function - GF54.30-P-3020T

MODEL 211.0 /2 up to 31.5.06 except CODE (494) USA version except CODE (498) Japan version

MODEL 211.0 /2 up to 30.6.06 with CODE (494) USA version with CODE (498) Japan version

Networking

Display Coolant Temperature - Communication Diagram. Scheme 80

Function overview

The coolant temperature sensor (B11/4) is an NTC resistor which reduces its resistance value as temperature increases.

The resistance of the coolant temperature sensor (B11/4) is read via the ME-SFI control unit (N3/10) or the CDI control unit (N3/9) and is relayed onto the engine compartment CAN as a CAN message.

The instrument cluster (A1) reads in this temperature from the engine compartment CAN and controls the engine coolant temperature gage (A1p1) accordingly. If necessary, a warning message also appears on the multifunction display (A1p13).

Displaying coolant temperature

The status display for the engine coolant is located on the right-hand side of the instrument cluster (A1).

The display is a segment display.

After the instrument cluster (A1) has been woken, one segment is actuated at temperatures < 40°C; at higher temperatures the segments are actuated according to the values measured by the coolant temperature sensor (B11/4). The display is held at 95°C for input values from 95°C to 115°C.

The system responds to a defective radiator fan by leaving the characteristic curve and reverting to a display that also shows temperatures between 96°C and 116°C

Display engine speed, function - GF54.30-P-3021T

MODEL 211.0 /2 up to 31.5.06 except CODE (494) USA version except CODE (498) Japan version

MODEL 211.0 /2 up to 30.6.06 with CODE (494) USA version with CODE (498) Japan version

Networking

Display Engine Speed - Communication Diagram. Scheme 81

Networking

The engine speed is registered by the crankshaft position sensor (L5).

The signals from the crankshaft position sensor (L5) are picked up by the ME control unit (N3/10) or the CDI control unit (N3/9) and are transmitted to the engine compartment CAN as a CAN message (in rpm).

The instrument cluster (A1) receives the CAN message and actuates the stepper motor of the tachometer (A1p5) relative to the engine speed.

Warning range

The warning range (marked in red on the scale) is below the end value of the scale. The end value of the scale is 7000 rpm for vehicles with gasoline engine and 5000 rpm for vehicles with diesel engine.

Adjustment for the number of cylinders

It is not necessary to adjust the tachometer (A1p5) to the number of cylinders in the engine.

If implausible CAN messages occur, the needle of the tachometer (A1p5) is moved to the left-hand end of the scale. An error bit is also stored in the fault memory

Display distance, function - GF54.30-P-3022T

MODEL 211.0 /2 up to 31.5.06 except CODE (494) USA version except CODE (498) Japan version

MODEL 211.0 /2 up to 30.6.06 with CODE (494) USA version with CODE (498) Japan version

Measuring mileage

The computer of the instrument cluster (A1) evaluates the following wheel speeds for the calculation of distance and speed

1. Left front rpm sensor (L6/1)
2. Right front rpm sensor (L6/2)
3. Left rear rpm sensor (L6/3)
4. Right rear rpm sensor (L6/4)

The instrument cluster (A1) receives the wheel speeds in rpm by way of the Controller Area Network bus Class C (engine compartment) (CAN-C) from the ESP control unit (N47-5). The system also includes tire size in its calculations of speed and distance.

Tire size is coded using STAR DIAGNOSIS.

Displaying the total mileage

The 6-digit display appears in kilometers or miles in the start screen below the multifunction display (A1p13) as soon as the instrument cluster (A1) is activated. The range for the main odometer is from 0 to 999,999 kilometers or miles. If the maximum mileage is reached, the counter is not reset to 0. In this case the instrument cluster (A1) should be replaced. However, the internal counter continues to operate up to a maximum of 1,677,721 km or 1.000.000 miles. Processing always takes place in kilometers, the display in miles is converted.

Saving mileage counts

The total mileage figure remains stored for at least 5 years, even if the voltage supply is disconnected. Functional integrity is guaranteed under normal conditions over the full service life of the vehicle (15 years or 10,000 operating hours).

Displaying the trip mileage

The trip mileage is displayed as a 5-figure number on the main screen of the multifunction display (A1p13) in kilometers or miles as soon as the instrument cluster (A1) is activated. The range for the trip mileage odometer is from 0 to 9999.9 kilometers or miles. The display is reset to 0 once the maximum mileage is reached.

Reset the trip odometer

The trip odometer is reset to 0 by pressing the instrument illumination brightness control and reset button (A1r1) for more than t = 2 s.

Function requirements

1. The instrument cluster (A1) is activated
2. The basic display (total mileage and trip odometer) is displayed on the multifunction display (A1p13).

Kilometer/miles changeover (up to 31.5.05)

The driver can switch the display from kilometers to miles using the "Settings" function.

Kilometer/miles changeover (as of 1.6.05)

The display of travel distances can no longer be changed over from kilometers to miles units via the "Settings" function via the "Settings" function. The kilometers/miles display is determined via the variant coding in the central gateway control unit (N93).

If implausible Controller Area Network (data bus/CAN bus) (CAN) messages are received for all wheel speed signals, the total and trip mileage displays are "frozen" and an error bit is set. The instrument cluster (A1) also passes the current reading of the main odometer on the class B (interior) controller area network bus (CAN-B)

Storage of data

If the battery (G1) is removed, the total mileage is stored for at least 10 years. The trip mileage is also protected against data loss if the battery (G1) is removed for a short period of time.

Display transmission information, function - GF54.30-P-3023T

MODEL 211.0 /2 up to 31.5.06 except CODE (494) USA version except CODE (498) Japan version

MODEL 211.0 /2 up to 30.6.06 with CODE (494) USA version with CODE (498) Japan version

Drive position display

The current drive position is displayed in the gear indicator (A1p12) in the instrument cluster (A1).

These displays show the set selector ranges for the automatic fivespeed transmission (NAG) (code 423) (1, 2, 3, 4, D, R, N, P) from the electronic selector lever module control unit (N15/5) and the set selector ranges for the Sequentronic automated manual transmission (SEQ) (code 424) (1, 2, 3, 4, 5 6, R, N) from the automated manual transmission control unit (N15/6).

Transmission mode display

The current transmission mode Winter "W" or Summer "S" (up to modification year 2003) and Comfort "C" or Sport "S" (as of modification year 2003) is displayed on the multifunction display (A1p13) in the instrument cluster (A1) by the electronic selector lever module control unit (N15/5) (up to modification year 2003).

On vehicles with model 211.067 and 211.267 the manual "M" transmission mode is also displayed.

The multifunction display (A1p13), gear indicator (A1p12) and transmission mode display (A1p16) appear after "circuit 15 ON".

In addition to displaying the drive position, the automated manual transmission control unit (N15/6) can also trigger warning messages in the multifunctions display (A1p13). If a detected fault causes the system to enter limp-home mode, "F" is shown in the transmission mode display (A1p16).

The required data are transmitted via the engine compartment CAN from the central gateway control unit (N93).

The display is hidden in the case of incorrect CAN signals

Display time, function - GF54.30-P-3024T

MODEL 211.0 /2 up to 31.5.06 except CODE (494) USA version except CODE (498) Japan version

MODEL 211.0 /2 up to 30.6.06 with CODE (494) USA version with CODE (498) Japan version

Networking

Scheme 82

The components indicated by broken lines are only relevant for vehicles with COMAND operating and display system (code 352) and navigation module for COMAND (code 527)

General information

Time measurement (clock) requires a periodic process with a cycle duration of high accuracy (e.g. earth rotation, pendulum oscillations).

Likewise, an electronic clock requires an electric clock signal with high frequency accuracy. This clock signal is derived from the very constant, mechanical oscillations of a quartz crystal. These oscillations/frequency is then scaled down to the required frequency of 1 Hz using an electronic frequency divider with control electronics (2).

In this way, the liquid crystal display (LCD) (3) receives one electrical pulse every second to change the display.

Displaying time on vehicles without COMAND

The electronic clock (A1p6) works according to the aforementioned principle.

The clock is adjusted via the "Settings" menu using the keys on the multifunction steering wheel

1. Scroll forward/back button (S110s1)
2. System select button (S110s3)
3. Pushbutton + and -, specific function setting and volume control (S111s1)

The signals from these buttons are read in by the steering column module (N80) and passed on to the instrument cluster (A1) via the interior CAN.

The instrument cluster (A1) also outputs the current time as a message over the interior CAN

Displaying time via COMAND operating and display system (Code 352) with navigation module for COMAND (code 527)

In vehicles with this equipment, the instrument cluster (A1) adopts the time from the COMAND operating, display and control unit (A40/3). The menus for adjusting the time are therefore unnecessary. The time information is transmitted by the COMAND operating, display and control unit (A40/3) over the interior compartment CAN as a message.

If the equipment code for COMAND is set in the instrument cluster (A1), it uses this time information.

If the GPS antenna (A2/49) is receiving GPS signals, these can be used to switch between summer and winter time automatically.

If it fails to receive time information from COMAND, the instrument cluster (A1) accesses its own internal clock (timer). The is no provision for manual adjustment of this internal timekeeper

Display speed, function - GF54.30-P-3025T

MODEL 211.0 /2 up to 31.5.06 except CODE (494) USA version except CODE (498) Japan version

MODEL 211.0 /2 up to 30.6.06 with CODE (494) USA version with CODE (498) Japan version

Networking

Scheme 83

The electronic speedometer (A1p8) with its speedometer segment ring indicates the vehicle speed.

Speedometer arc

This is located in the second, passive level of the central display, which contains special areas that are activated to display the segments. The display of the speedometer segment ring comprises 52 segments in the ECE variants, 64 segments in the USA/UK variants which are visible on the inner edge of the speedometer scale.

On vehicles with model designation 211.067 and 211.267, the ECE variants and USA/UK variants each have 64 segments which are visible around the inner edge of the speedometer scale

Measuring the vehicle speed

The speed is the distance traveled in kilometers or miles per hour. To calculate the vehicle speed, the processor in the instrument cluster (A1) evaluates the following wheel speeds

1. Left front rpm sensor (L6/1)
2. Right front rpm sensor (L6/2)
3. Left rear rpm sensor (L6/3)
4. Right rear rpm sensor (L6/4)

The instrument cluster (A1) receives the wheel speeds in rpm from the ESP control unit (N47-5) via the engine compartment CAN.

Speed limit (winter tires)

The speedometer segment ring is not displayed if a speed limit (from 160 km/h to 210 km/h in steps of 10 km/h or from 100 mph to 150 mph in steps of 10 mph) is activated via the 2nd operating level of the instrument cluster (A1).

Evaluating the wheel speed signals

Since not all of the wheels rotate at the same speed (when cornering), all four wheel speeds must be evaluated. The actual process is relatively complex, which is why only a general description is provided here

The individual wheel speeds are compared and submitted to a plausibility check. If there are no significant differences, the vehicle speed is determined using the rotational speed of the left front wheel.

If the individual wheel speed signals differ considerably, the speed signals may be faulty or the vehicle may be cornering.

1. If the processor's (lateral) comparisons of wheel speed indicate that the vehicle is cornering the speed is calculated from the average for both front wheels.
2. If the comparisons indicate one or more incorrect wheel speeds, the speed is calculated from the highest wheel speed. This also applies if an error message is received instead of a rotational wheel speed. In this case, an appropriate error bit is stored in the memory.

Digital speedometer

The vehicle speed is displayed digitally. The default value for the display unit (km/h or miles/hr) is stored as a country-specific unit in non-volatile memory and can be changed via "Settings" in the Configurations/Settings menu item.

The digital speed display is matched to the speedometer display by a performance map. This ensures that the value of the analog needle position and the reading shown on the display are synchronized.

No speed display appears if error messages are received for all four wheel speeds. As the distance readings are also based on monitored speed, the odometer will cease to operate

Depending on the national version, the electronic speedometer (A1p8) has a scale in kilometers per hour or a scale in miles per hour

On vehicles with model designation 211.067 and 211.267, the scale of the electronic speedometer (A1p8) goes up to 320 km/h or 160 mph

The tire size is taken into account when calculating the speed. Coding is performed using the Star Diagnosis tool

Battery charge/alternator monitoring, function - GF54.30-P-3027T

MODEL 211.0 /2 as of 1.6.06 except CODE (494) USA version except CODE (498) Japan version

MODEL 211.0 /2 as of 1.7.06 with CODE (494) USA version with CODE (498) Japan version

Networking, shown with engine 272

Battery Charge/Alternator Monitoring - Communication Diagram. Scheme 84

Battery charge indicator lamp and alternator indicator lamp

In the event of a fault in the power generator the battery symbol and message "Locate workshop" (this message belongs to category 2) or "Stop - battery/alternator" (this message belongs to category 1) are displayed in the multifunction display in the instrument cluster.

The message appears if the alternator is not working correctly (circuit 61), but the engine speed is higher than 200 rpm. There is no message when the engine is OFF.

Networking

The following Controller Area Network (data bus/CAN Bus) CAN messages are required

1. Circuit 61 alternator monitor
2. Signal "circuit 61 (D+)" from alternator

The alternator indicator lamp "circuit 61" is read in by the driver-side SAM control unit with fuse and relay module.

The driver-side SAM control unit with fuse and relay module then places the message "circuit 61 HIGH" (voltage circuit 61 > 9 V) or "circuit 61 LOW" (alternator not working correctly) on the Controller Area Network bus Class B (interior) (CAN B).

Engine speed

The pulses from the crankshaft Hall sensor are read in by the ME-SFI [ME] control unit or by the CDI control unit (N3/9). The respective control unit places the message motor speed (in rpm) on the Controller Area Network bus Class C (engine compartment) (CAN-C). The instrument cluster receives these messages and evaluates them.

Alternator check, circuit 61 (D+)

The CAN message "term. 61" can have the status "high" and "low". The respective status depends on the actual voltage at the input of the driver-side SAM control unit with fuse and relay module. The status is "HIGH" if the voltage is greater then 9 V. It is "LOW" when the voltage drops back below 4.5 V.

Excitation current for the alternator

Once circuit 15 is switched on the battery current flows via the alternator preresistance, which is located in the wiring harness, through the excitation winding in the rotor and via the regulator to circuit 31.

The preexcitation is introduced in the process. At low engine speeds self-excitation is nonfunctional, so pre-excitation takes place. If, when the engine is running, the alternator voltage rises above the battery voltage, the excitation winding is supplied by the alternator itself. The voltage at tml. 61 increases to the same voltage as the alternator voltage. If the alternator voltage drops below the battery voltage, this is detected by the driver-side SAM control unit with fuse and relay module and relayed as a CAN message to the instrument cluster, which outputs an appropriate message via the multifunction display.

Instrument cluster (IC), task - GF54.30-P-3039-02T

The task of the instrument cluster (A1) is to visualize the dynamic and static behavior of the vehicle.

The information for the driver consists of 4 displays

1. Electronic speedometer (A1p8)
2. Tachometer (A1p5)
3. Electronic clock (A1p6)
4. Multifunction display (A1p13) with driver-relevant information in upper display field, main and trip odometer reading as well as gear indicator (A1p12) and transmission mode display (A1p16).

The instrument cluster (A1) provides the driver additional information from the following display components

1. Engine coolant temperature gage (A1p1)
2. Fuel level and reserve gage (A1p2)

The various functions of the multifunction steering wheel are also displayed via the instrument cluster (A1).

There are a total of 16 versions of the instrument cluster (A1), each dependent on the vehicle equipment, the equipment lines Classic, Elegance, Avantgarde and the chosen engine type

Function of trip computer (TRIP) - GF54.50-P-0001T

Model 211.0 /2

The trip computer menu can be used to call up and display statistical data. The trip computer is integrated in the instrument cluster (A1). The display takes place via the multifunction display (A1p13) in the instrument cluster A1).

Two different data memories can be accessed

to access

The contents of the short-distance memory are shown in the display screen "since start" and the contents of the long-distance memory are shown in the display screen "since reset".

The trip computer can be reset manually using the instrument illumination dimmer and reset button (A1r1).

The following functions are provided by the trip computer

1. Mileage traveled "since start or since reset"
2. Time elapsed since "start" or since the last "reset"
3. Average speed since "start" or since the last "reset"
4. Average fuel consumption since "start" or since the last "reset"

In addition, the calculated range with the current tank contents can be displayed via the multifunction display (A1p13).

Operation

The trip computer is operated using the left multifunction steering wheel button group (S110).

The instrument cluster (A1) receives all the information required for the trip computer functions over the engine compartment CAN and over the interior compartment CAN

Trip computer (TRIP), networking of components - GF54.50-P-0001-02T

Function survey

The trip computer is integrated in the instrument cluster (A1).

The instrument cluster (A1) is linked with

1. the engine compartment CAN and
2. the interior compartment CAN

Data is exchanged with virtually all the control units over the two bus systems.

However, the instrument cluster (A1) does not act as an interface between the two data bus systems. This function is reserved for the central gateway control unit (N93)

This document lists the principal CAN messages for the functions of the instrument cluster (A1) including the trip computer.

The connections of the instrument cluster (A1) are described in the last part of this document.

The trip computer receives the following input signals

1. The wheel speeds over the engine compartment CAN from the ESP, SPS and BAS control module (N47-5)
2. The consumption signal from the motor electronics control unit (N3/10) or CDI control unit (N3/9) via the engine compartment CAN
3. The time over the interior compartment CAN from the audio gateway control module (N93/1), and this over MOST from the COMAND operating, display and control module (A40/3) in vehicles with COMAND operating, display and control module (A40/3)
4. The states "Terminal 15" and "Key in ignition" over the interior compartment CAN from the EIS control module (N73)
5. The actuation signals from the buttons on the multifunction steering wheel over the interior compartment CAN from the steering column module (N80)
6. The fuel tank level over the interior compartment CAN from the rear SAM control module with fuse and relay module (N10/2)

CAN messages from the buttons on the multifunction steering wheel

Since the buttons on the multifunction steering wheel each have several functions, the signals from these buttons must be processed accordingly

1. All the buttons in the left multifunction steering wheel button group (S110) and the right multifunction steering wheel button group (S111) are voltage-coded and are read by the steering column module (N80).
2. The steering column module (N80) relays the relevant messages onto the interior compartment CAN.
3. These CAN messages are received by the instrument cluster (A1).
4. The instrument cluster (A1) interprets these messages in combination with the systems displayed in the multifunction display (A1p13) and passes on these interpreted messages again on the interior CAN.

Received messages for the multifunction display

All signals for the messages in the multifunction display (A1p13) are received over the engine compartment CAN or interior CAN. The signal paths and further details on various messages can be read in the function descriptions of the systems in question.

Kilometer / miles switchover, function - GF54.50-P-2002T

MODEL 211.0/ 2

No particular changeover of dimensional units is to be performed for the trip computer as it takes over the settings and codings of the instrument cluster (A1).

The dimensional units (miles/kilometers) are changed over in the instrument cluster (A1) via the selection "Settings" in the submenu "instrument cluster" in the multifunction display (A1p13) using the multifunction steering wheel (MFL).

The only requirement is to preset the unit of measurement used to monitor the distance (kilometers or miles). The other units that are relevant for the trip computer are then converted automatically.

US-gallons/UK gallons are coded via the national version using STAR DIAGNOSIS

Travel time, function - GF54.50-P-2004T

Model 211.0 /2

Travel time "Since start" (short-distance memory), function

Scheme 85

Travel time "Since reset" (long-distance memory), function

Identifying Travel Time "Since Reset" (Long-Distance Memory) Function. Scheme 86

The display screen "since start" of " since reset" for the journey time can be activated the via the system selection button (S110s3) and scroll forwards and backwards button (S110s1) of the multifunction steering wheel.

As the time is only counted with "terminal 15 ON", the instrument cluster (A1) requires information about the status of terminal 15. This information is relayed by the EIS control module (N73) onto the interior compartment CAN and is read by the instrument cluster (A1). The time is calculated internally in the instrument cluster (A1)

If the display of travel time or travel distance exceeds the maximum display value (99:59 hours or 40959 miles (65535 km)), then the travel time and travel distance of the respective memory are reset automatically. This preserves the relationship between travel time and mileage

Range, function - GF54.50-P-2006T

Model 211.0 /2

Identifying Calling Up Range Function Display. Scheme 87

The range can be called up on the multifunction steering wheel using the system selection button (S110s3) in the first function of the multifunction display (A1p13). The scrolling forwards and backwards button (S110s1) indicates the range.

To calculate the range the trip computer in the instrument cluster (A1) requires the fuel level in the fuel tank.

The fuel level sensor for the left half of the tank (B4/1) and the fuel level sensor for the right half of the tank (B4/2) are polled by the rear SAM control module with fuse and relay module (N10/2) and the appropriate message is relayed onto the interior compartment CAN. The instrument cluster (A1) receives this message, evaluates it and displays the corresponding value as the tank content.

As the time is counted only when terminal 15 is ON, the instrument cluster (A1) requires the information regarding the status of terminal 15. This information is relayed by the EIS control module (N73) onto the interior compartment CAN and is read by the instrument cluster (A1). The time is calculated internally in the instrument cluster (A1)

If the displayed travel time or mileage exceeds the maximum display value (99:59 hours or 40959 miles (65535 km)), the travel time and the mileage are automatically reset in the relevant memory. This preserves the relationship between travel time and mileage

Fuel consumption, function - GF54.50-P-2007T

Model 211.0 /2

Fuel consumption "Since start" (short-distance memory), function

Identifying Fuel Consumption "Since Start" (Short-Distance Memory) - Function Display. Scheme 88

Fuel consumption "Since reset" (long-distance memory), function

Identifying Fuel Consumption "Since Reset" (Long-Distance Memory) - Function Display. Scheme 89

The display screen "since start" of " since reset" for the journey time can be activated the via the system selection button (S110s3) and scroll forwards and backwards button (S110s1) of the multifunction steering wheel.

Depending on the adjustment (miles/kilometers) and coding of the national version of the instrument cluster (A1) the display takes place in

1. Miles per gallon
2. Liters per 100 kilometers or
3. Kilometers per liter (only if national version Japan is coded)

The trip computer calculates the average fuel consumption figures from the mileage traveled and the consumption signal.

The fuel consumption signal uses information on the amount of fuel injected within a specific period

The instrument cluster (A1) receives this data in the following way

1. The consumption signal is produced by the motor electronics control unit (N3/10) and by the CDI control unit (N3/9) and is placed as a message on the engine compartment CAN.
2. The mileage traveled is calculated from the four wheel speeds. The signals come over the engine compartment CAN from the ESP, SPS and BAS control module (N47-5).

After a reset it may take as much as three kilometers/miles or up to two minutes until enough data is available to calculate and display the fuel consumption figures correctly. During this time depending on the adjustment (miles/kilometers) and coding of the national version of the instrument cluster (A1)5.8 MPG, 40 L/100 km or 2.5 km/L is displayed

It is normal for different values to be displayed in the "since start" (short-distance memory) display screen and in the "since reset" (long-distance memory) display screen as both displays access different data records.

The "Since start" display (short-distance memory) reacts much more sensitively to the current driving situation than the "Since reset" display (long-distance memory).

Distance, function - GF54.50-P-2008T

Model 211.0 /2

Mileage "Since start" (short-distance memory), function

Scheme 90

Mileage "Since reset" (long-distance memory), function

Scheme 91

The display screen "since start" of " since reset" for the journey time can be activated the via the system selection button (S110s3) and scroll forwards and backwards button (S110s1) of the multifunction steering wheel.

The four wheel speed signals are analyzed for the mileages traveled. They are transmitted as a message on the engine compartment CAN from the ESP, SPS and BAS control module (N47-5) to the instrument cluster (A1). Counting the travel distance takes place in parallel with the counting of the odometer function of the instrument cluster (A1)

If the display of the travel distance or travel time exceeds the maximum display value (40959 miles (65535 km) or 99:59 hours), then the travel time and travel distance of the respective memory are reset automatically. This preserves the relationship between travel time and mileage

Average speed, function - GF54.50-P-2009T

Model 211.0 /2

Average speed "Since start" (short-distance memory), function

Identifying Average Speed "Since Start" (Short-Distance Memory) Function Display. Scheme 92

Average speed "Since reset" (long-distance memory), function

Scheme 93

The "since start" or " since reset" display screen for the average speed can be activated via the system selection button (S110s3) and scroll forwards and backwards button (S110s1) on the multifunction steering wheel.

The following information is required

1. Travel time: calculated internally in the instrument cluster (A1).
2. Mileage: calculated from the four wheel speeds. The wheel speeds are transmitted as a message on the engine compartment CAN from the ESP, SPS and BAS control module (N47-5) to the instrument cluster (A1).

It is normal for different values to be displayed in "since start" (short-distance memory) display screen and in the "since reset" (long-distance memory) display screen as both displays access different data records. The "Since start" display (short-distance memory) reacts much more sensitively to the current driving situation than the "Since reset" display (long-distance memory)

Parktronic system (PTS), function - GF54.65-P-0001T

MODEL 211.0 /2 with CODE (220a) Parktronic System (PTS)

Shown on model 211.0

Overall description

The Parktronic system (PTS) is an electronic parking assist. It assists the driver in estimating the distances to obstacles in front of and behind the vehicle, particularly in blind spots.

When the vehicle is moving forwards the Parktronic system (PTS) only monitors the front of the vehicle.

When the vehicle is moving backwards the Parktronic system (PTS) monitors the back and front of the vehicle. Requirement

1. manual transmission or Sequentronic only when reverse gear is engaged.
2. Automatic transmission or Tiptronic selector lever "N" or "R".

Function conditions

1. Terminal 15 ON
2. Parking brake not operated
3. Selector lever (automatic) in drive mode D, N or R
4. Vehicle speed < or = 16 km/h

Function

The distance between the vehicle and obstacle is detected via the front bumper PTS sensor unit (A42) and rear bumper PTS sensor (A43) and passed on to the Parktronic control unit (N62).

The Parktronic control unit (N62) evaluates the signals and activates the center instrument panel PTS warning indicator (A44/4) or the Rear PTS warning indicator (A44/3).

One side of the warning indicator is assigned to each side of the bumper. The warning indicators warn the driver by means of both acoustic and visual signals.

The Parktronic system (PTS) is activated by switching on the ignition, a system self-test is carried out first.

Deactivation

1. The system can be switched off or on manually via the PTS OFF switch (N72s13) in the lower control panel control unit (N72). Feedback is effected via an LED in the PTS OFF switch (N72s13).
2. Speed-dependent cutout (v > or = 18 km/h).
3. Cutout of rear components with trailer recognition (with code (550) trailer hitch).

Scheme 94

Shown on Model 211.0

Forward travel, function - GF54.65-P-4000T

MODEL 211.0 /2 with CODE (220a) Parktronic system (PTS)

Shown on model 211.0

If the vehicle approaches an obstacle when moving forwards (v < or = 16 km/h), the front Parktronic components are active.

The front sensors (6 pieces) of the front bumper PTS sensor unit (A42) detect obstacles

1. in the range of A (15 cm to 60 cm)
2. in the range of B (20 cm to 100 cm)

The driver is alerted visually and acoustically by the PTS warning display, center of instrument panel (A44/4).

Identifying Forward Travel, Function. Scheme 95

Reversing, function - GF54.65-P-4001T

MODEL 211.0 /2 with CODE (220a) Parktronic system (PTS)

Shown on model 211.0

If the vehicle approaches an obstacle when reversing (v < or = 16 km/h), the rear and front components of Parktronic are active.

The front sensors (6 pieces) of the front bumper PTS sensor unit (A42) detect obstacles

1. in the range of A (15 cm to 60 cm)
2. in the range of B (20 cm to 100 cm)

The rear sensors (4 pieces) of the rear bumper PTS sensor unit (A43) detect obstacles

1. in the range of C (20 cm to 80 cm)
2. in the range of D (20 cm to 120 cm)

The driver is alerted visually and acoustically by the

Scheme 96

1. PTS warning display, rear (A44/3) and the
2. PTS warning display, center of instrument panel (A44/4). (Scheme 70): Identifying Reversing, Function For a better distinction as to whether an obstacle is located in front of or behind the vehicle, the acoustic warning message is output at different frequencies. The warning signal for the PTS warning display, center of instrument panel (A44/4) has a higher frequency.

Warning display, function - GF54.65-P-4104-01A

Function

On all models, except model 163 the function readiness of the Parktronic system (PTS) is signaled by the bright frame of the LCD warning indicator.

In model 163 this is indicated by the first yellow segment of the LED warning display lighting up at half brightness (approximately 50% of maximum possible brightness).

When an obstacle is approached, one or more segments of the warning indicator light up depending on the distance.

An intermittent warning tone sounds when the first red segment lights up. At the second red segment the intermittent tone becomes a continuous signal.

The warning tones from the front and rear warning displays are different.

The brightness of the warning indicators (background illumination) changes if

1. on vehicles without automatic light switch daylight sensor the lighting is switched on with the exterior lamp switch.
2. on vehicles with automatic light switch daylight sensor the ambient conditions such as darkness, twilight or passing through a tunnel are recognized.

In both cases the brightness is reduced to 30% of maximum brightness.

In countries with daylight driving lamp circuit, the brightness does not change, but remains constant at 60% of the maximum possible brightness.

In models 140, 168, 202, 208, 210, 211 the function of the daytime running lamps can be activated via the corresponding diagnosis tool (STAR-DIAGNOSIS).

Actuation of segments: Model 140, 163, 202, 208, 209.3, 210, 211, 215, 220

Actuation of segments: Model 168

Warning display, function - GF54.65-P-4104-01T

The visual warnings takes place via LED displays. A display page consists of 6 yellow and 2 red LEDs.

This functional readiness is signaled by the first yellow LED with reduced current (half-bright).

If the vehicle rolls towards an obstacle and thus into the monitoring range, the first yellow LED lights up with full brightness. The nearer the vehicle gets to an obstacle, the more yellow LEDs are actuated. If the distance to the obstacle reduces to 30 cm, the first red LED lights up and when the minimum distance of 20 cm is reached the second red LED lights up.

When the first red segment (3) lights up in addition an intermittent signal sounds. When the second red segment (3) lights up the intermittent signal becomes a continuous signal.

The warning tones of the center instrument panel PTS warning indicator (A44/4) and rear PTS warning indicator (A44/3) have a different frequency in order to guarantee a better differentiation.

The brightness of the LEDs depends on the conditions of the surroundings, for example, darkness, twilight or driving through a tunnel.

The brightness is reduced to 30% of the maximum brightness.

In the event of a malfunction (signal interruption, sensor failure) all the red LEDs are actuated.

If the malfunction also occurs while driving, it is stored as a system fault and displayed until the next activation. After a further 20 seconds the center instrument panel PTS warning indicator (A44/4) or rear PTS warning indicator (A44/3) switches off, a continuous tone sounds for 3 seconds.

Actuation of center instrument panel PTS warning indicator (A44/4)

ACTUATION OF CENTER INSTRUMENT PANEL PTS WARNING INDICATOR (A44/4)

Actuation of rear PTS warning indicator (A44/3)

ACTUATION OF REAR PTS WARNING INDICATOR (A44/3)