GF54.21-P-6070FL Front SAM Control Unit With Fuse and Relay Module, Component Description

GF54.21-P-6070FL Front SAM Control Unit With Fuse And Relay Module, Component Description

Component Identification:

Location
The front SAM control unit is located in the left front of the engine compartment.

Task
The front SAM control unit supplies various systems via limit switches and supplies control units with voltage depending on the function sequence.

In addition the front SAM control unit has the following tasks:
^ Reading in of sensors, pickups and signals
^ Evaluation of input factors
^ Control of systems
^ Actuation of components
^ Central gateway Voltage supply to components
^ Power supply and relay switching
^ Switching consumers using relays

Reading in of sensors, pickups and signals
The input factors are read in with the following connections:
^ Direct line
^ Instrument panel LIN (LIN 1)
^ Wiper/inside rearview mirror LIN (LIN 2)
^ Controller Area Network (data bus/CAN bus) (CAN)

Direct line
The signals from the following components are read via a direct line:
- Refrigerant pressure sensor (B12)
- Outside temperature sensor (B14)
- Exterior lights switch (S1) (model 212.077, model 212.2 and model 212.0 as of 1.12.09)
- Brake fluid level switch (S11)
- Parking brake indicator switch (S12)
- Backup lamp switch (S16/2) (for transmission 711, 716)
- Coolant level switch (S41)
- Windshield washer system fluid level switch (S42)
- Right front brake wear sensor (S10/2)
- Right rear brake wear sensor (S10/4)

The following components are contacted at the front SAM control unit, its signals are made available to other control units:
- Engine hood antitheft alarm system switch (S62) (with code (551) Antitheft alarm system (ATA [EDW]))

Instrument panel LIN
The signals for the following components are read in over the instrument panel LIN:
- Electronic level control button (S77s1) (with code (489) AIRMATIC (air suspension with continuously adjustable damping)
- Comfort and Sport button (S77s2) (with transmission 722)
- Upper control panel control unit (/)N72/1
- Exterior lights switch (model 212.0 up to 30.11.09 except model 212.077)
- Hazard warning flasher switch (S6/1s1)

Wiper/inside rearview mirror LIN
The signals of the following components are read in via the wiper LIN:
- On vehicles with code (249) Automatic dimming inside and outside rearview mirrors including folding outside mirror without code (494) USA version or code (249) Automatic dimming inside rearview mirror and outside mirror (driver) and code (494) USA version:
- Forward automatic mirror dimming light sensor (A67h1)
- Rearward automatic mirror dimming light sensor (A67h2)

- Garage door opener (A67n2) (with code (232) Garage door opener with frequency 284-390 MHz)
- Rain/light sensor (/)B38/2

CAN
The signals are read in by the front SAM control unit via the following CAN.
The functions resulting therefrom are described in the corresponding function descriptions (see block diagram or function schematic).
- Interior CAN (CAN B)
- Chassis CAN (CAN E)
- Front end CAN (CAN G)
- Diagnostic CAN (CAN D)

Evaluation of input factors
The input factors are evaluated by the microprocessor and the corresponding components are actuated. Moreover an acceleration sensor is integrated in the front SAM control unit with the help of which a crash event can be detected

Control of systems
The front SAM control unit controls the following systems:
- Exterior lights [ABL]
- Interior illumination (IBL)
- Wiper system (WSA)
- Windshield washer heater (with code (875) Heated windscreen washing system)
- Headlamp cleaning system (SRA) (with code (600) HCS)
- Rain closing, tilting/sliding roof (SHD) (with code (414) Electrical glass tilting/sliding roof)

Actuation of components
The actuation of the components takes place via the following connections:
^ Direct line
^ Instrument panel LIN
^ Wiper/inside rearview mirror LIN
^ CAN

Direct line
The following components are actuated via a direct line:
- Refrigerant compressor (A9)
- Left front lamp unit (E1)
- Left daytime running lights headlamp (E1/3) (without code (498) Japan version)
- Right front lamp unit (E2)
- Right daytime running lights headlamp (E2/3) (without code (498) Japan version)
- On vehicles with code (498) Japan version or without code (614) Bi-xenon headlamp unit and without code (615) bi-xenon headlamp unit with integral curve illumination and without code (616) Bi-xenon headlamp unit with asymmetric integral curve illumination and without code (618) Bi-xenon headlamp and without code (621) ILS (left-hand traffic) and without code (622) ILS (right-hand traffic):
- Left fog lamp (E5/1)
- Right fog lamp (E5/2)

- With code (494) Canada version or code (460) USA version
- Left front side-marker lamp (E6/1)
- Right front side-marker lamp (E6/2)

- On vehicles with code (954) Avantgarde or code (955) Elegance:
- Right front footwell lamp (E17/15)
- Left front footwell lamp (E17/16)
- Left rear footwell lamp (E17/17)
- Right rear footwell lamp (E17/18)

- Left fanfare horn (H2) and right fanfare horn (H2/1)
- Windshield washer system pump (M5/1)
- Headlamp cleaning system pump (M5/2) (with code (600) Headlamp cleaning system)
- Coolant circulation pump (M13/5)
- Spray nozzle heater (R2/1)
- Spray nozzle hose heater (R2/11) (with code (875) Heated windshield washer system)
- Ashtray illumination (R3e1) (with code (301) Ashtray package/smoker package)
- Exterior lights switch (model 212.077, model 212.2 and model 212.0 as of 1.12.09)

Instrument panel LIN
The following components are actuated via the instrument panel LIN:
- Exterior lights switch (model 212.0 up to 30.11.09 except model 212.077)
- Hazard warning flasher switch
- Electronic level control button () (with code (489) AIRMATIC (air suspension with continuously adjustable damping)
- Comfort and Sport button () (with transmission 722)

Wiper/inside rearview mirror LIN
The following components are actuated via the wiper LIN:
- Inside rearview mirror (A67)
- Garage door opener (with code (232) Garage door opener with frequency 284-390 MHz)
- Wiper motor (M6/1)

CAN
The signals are transmitted by the front SAM control unit via the following listed CAN.
The functions resulting therefrom are described in the corresponding function descriptions (see block diagram or function schematic).
- Interior CAN
- Chassis CAN
- Front end CAN
- Diagnostic CAN

Central gateway
A second microprocessor for controling the central gateway functions is integrated in the front SAM control unit. Both microprocessors communicate internally with each other via the interior CAN and can be diagnosed separately.

The front SAM control unit SAM serves as an interface of the following data bus systems:
^ Instrument panel LIN
^ Wiper LIN
^ Interior CAN
^ Chassis CAN
^ Front end CAN
^ Diagnostic CAN

Voltage supply to components
- Instrument cluster (A1)
- Radio (A2) (with code (510) Audio 20 with CD changer or with code (523) MB Audio 20 radio)
- Radio with Auto-Pilot-System (A2/56) with code (511) Audio 50 APS incl. DVD changer or code (525) Radio MB Audio 50 APS)
- COMAND controller unit (A40/3) (with code (512) COMAND APS incl. DVD changer or code (527) COMAND APS with single DVD drive (with navigation) or code (528) COMAND incl. DVD changer)
- Audio/COMAND display (/)A40/8
- Audio/COMAND control panel (/)A40/9
- Multifunction camera (A40/11) (with code (476) Automatic lane recognition or code (513) Speed limit assist or code (608) Adaptive high beam assist)
- Panoramic sliding roof control module (A98) (with code (413) Panoramic glass sunroof with top sliding sunroof)
- Front passenger seat occupied recognition (B41/1) (without code (U18) automatic child seat recognition (ACSR))
- Front passenger seat occupied recognition and ACSR (AKSE) (B48) (with code (U18) Automatic child seat recognition (ACSR [AKSE]) and without code (494) USA version)
- Glove compartment lamp (E13/1) (switched via the glove compartment lamp switch (S17/9))
- CDI control unit (N3/9) (on diesel engine)
- ME-SFI [ME] control unit (N3/10) (on gasoline engine)
- Rear SAM control unit with fuse and relay module (/)N10/2
- Oxygen sensor upstream of catalytic converter (G3/2) (on diesel engine)
- Supplemental restraint system control unit (/)N2/10
- Electronic transmission-control control unit (N15/3) (on transmission 722.6)
- Electronic selector lever module control unit (N15/5) (with transmission 722.6)
- Rear automatic air conditioning operating unit (N22/4) (with code (581) Comfort automatic air conditioning)
- Automatic air conditioning control and operating unit (N22/7)
- Electric steering lock control unit (N26/5) (not with transmission 722.9)
- Electronic Stability Program control unit (N30/4) (without code (233) DISTRONIC PLUS) or
- Electronic Stability Program Premium control unit (N30/7) (with code (233) DISTRONIC PLUS)
- Left front door control unit (/)N69/1
- Right front door control unit (/)N69/2
- Overhead control panel control unit (N70) (with code (414) Power glass tilting/sliding sunroof)
- Overhead control panel electronics (N70/3) (without code (414) Power glass tilting/sliding roof)
- Upper control panel control unit
- Electronic ignition lock control unit (N73)
- Steering column module control unit (N80)
- Fuel pump control unit (N118) (on gasoline engine)
- Stop lamp switch (S9/1)
- Fully integrated transmission control unit (Y3/8n4) (with transmission 722.9)

Power supply and relay switching
The following relays are switched by the front SAM control unit:
- Terminal 15 relay (N10/1kJ)
- Terminal 15R relay (N10/1kK)
- Wiper park heater relay (N10/1kL)
- Circuit 50 starter relay (N10/1kM)
- Engine circuit 87 relay (N10/1kN)
- Fanfare horn relay (N10/1kO)
- Secondary air injection relay (N10/1kP) (on gasoline engine)
- Backup relay (N10/1kQ)
- Chassis circuit 87 relay (N10/1kR)
- Decoupling relay ((K19/7) (with code (B03) ECO start/stop function)
- Support relay (K114) (with code (B03) ECO start/stop function)

The relay for circuit 50 starter (N10/1kM) is actuated by the CDI control unit or by the ME-SFI control unit.

Switching consumers using relays
- Electric air pump (M33) (on gasoline engine) via the secondary air injection relay