LEMON Manuals: Even more car manuals for everyone
Home >> Mercedes Benz >> 2008 >> CL550 >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Anti-Theft & Central Locking -- Cl550 -- 216 Chassis >> Basic Knowledge >> Activate anti-theft alarm system, function - GF80.50-P-2002LE

Activate anti-theft alarm system, function - GF80.50-P-2002LE

MODEL 221.0 /1, 216.3 as of model year 09 /YoM 08 with CODE (551) Anti-theft alarm system (ATA [EDW]) 

Function requirements general 

Activate antitheft alarm system (ATA) general 

The antitheft alarm system (ATA) is activated automatically when the vehicle is locked with the central locking (CL). Then the individual alarm inputs are monitored. The activated ATA is indicated by the ATA function indicator (N72/1e2) flashing continuously.

IMPORTANT On vehicles for Belgium, the ATA arms automatically without locking the vehicle with the CL.

IMPORTANT It is possible, before locking the CL, to switch off the tow-away protection (except with code (494) USA version, with code (460) Canada version and with code (498) Japan version) or the interior protection (on vehicles with code (882) Interior monitoring (only with ATA)).

Activation of the ATA comprises several subfunctions:

Function sequence for activating ATA 

The partial function is comprised of the following partial functions:

IMPORTANT Special case: Driver door

If the driver door is still open when the CL is locked, it is not locked. When the driver door is closed, the door status is indicated to the rear SAM control unit with fuse and relay module (N10/2) and the alarm input is included in the checking cycle. This leads to actuation of an alarm when opening the driver door without previous deactivation of the ATA.

Function sequence for locking CL with transmitter key 

When the "Lock" button on the transmitter key (A8/1) is actuated, it transmits a radio signal via the rear window antenna amplifier module (A2/12) to the rear SAM control unit. This relays the signal to the EIS control unit (N73) via interior CAN. Parallel to the radio signal an infrared signal is transmitted by the transmitter key to the driver door (B58) (precise aiming required).

This signal is read in by the left door control unit (N69/1) (model 216) or left front door control unit (N69/1) (model 221) and is transmitted by the EIS control unit via the interior CAN.

In both cases, the EIS control unit checks the access authorization of the transmitter key.

If the access authorization is valid, the message "Vehicle locked" is transmitted with the interior CAN to the SAM control unit, which then activates the ATA.

Function sequence for locking CL with automatic relocking feature 

The automatic relocking function is actuated by the EIS control unit. If the vehicle is unlocked and neither a door nor the trunk lid is opened within 40 s, the vehicle relocks automatically. The EIS control unit transmits via interior CAN the message "Vehicle locked" to the rear SAM control unit, which then activates the ATA.

Function sequence for locking CL with Keyless-Go: 

Detailed information on the function sequence for locking the CL via Keyless-Go is given in the separate Keyless-Go function description.

After locking the CL, the EIS control unit transmits the message "Vehicle locked" via interior CAN to the rear SAM control unit, which then activates the ATA.

Function sequence for self-activation 

When the transmitter key is removed from the EIS control unit, the driver door or the trunk is opened and closed again, the ATA is activated automatically 2 s after the last door or the trunk lid is closed, regardless of the status of the vehicle central locking. The interior protection and the tow-away protection are set to the same state as before the last unlocking procedure.

Additional function requirements for switching off tow-away protection of ATA 

Function sequence for switching off tow-away protection of ATA 

The tow-way protection can be deactivated with the COMAND control unit (A40/3) or by the button for free programming (A40/9s10), if not programmed previously, in the front central operating unit (A40/9). The tow-way protection can be deactivated or activated independently from the selected circuit status. This makes it possible, for example, to deactivate the tow-away protection while driving. Deactivation is only valid for the following activation. It is reset with ignition "ON" (c. 15) or each time the ATA is deactivated.

Additional function requirements for switching off interior protection of ATA 

Function sequence for switching off interior protection of ATA 

The interior protection (with code (882) Interior monitoring (only with ATA)) can be deactivated with the COMAND control unit or the button free for programming, if not programmed previously in the central front control unit. The interior protection can be deactivated or activated independently from the selected circuit status. This makes it possible, for example, to deactivate the interior protection while driving. Deactivation is only valid for the following activation. It is reset with ignition "ON" (c. 15) or each time the ATA is deactivated.

Additional function requirements for activating alarm inputs 

Function sequence for activating alarm inputs 

The partial function is comprised of the following partial functions:

Function sequence for monitoring switch 

The status of the following switches is checked cyclically every t = 0, 4 ms. If the polls indicate that an input is at rest within t = 10 s, the corresponding input is then armed. Alarm inputs set later to the non-actuated state, e.g. if the trunk lid is closed only after the vehicle has been locked, are also armed t = 10 s after closing.

Monitored switches:

Function sequence for activating tow-away protection 

The tow-away protection is activated (if not previously deselected for the next locking operation) t = 10 s after the locking command from the EIS control unit and after closing the last door and tailgate.

The inclination sensor in the alarm siren determines a reference position, with which the relative vehicle inclination is compared during the activation. Determination of the reference position requires approx. t = 10 to 15 to s, for this reason an alarm can only be triggered t = 25 s at the earliest after arming.

The inclination sensor communicates with the rear SAM control unit with rear SAM-LIN.

When the maximum vehicle inclination is exceeded with regard to the reference position, an alarm is triggered.

If the vehicle inclination changes very slowly (e.g. leaky tire), the reference position adapts to the current vehicle position to prevent inadvertent activation of the inclination sensor.

If the vehicle inclination sensor is faulty, all other components of the ATA continue to function properly and the corresponding fault codes are entered in the fault memory in the rear SAM control unit.

Function sequence for activating interior protection 

The interior protection is activated (if not previously deselected for the next closing) t = 10 s after the last door or the trunk is closed. The interior protection is ready for alarm after another t = 20 s, because it is first necessary to calibrate the ultrasonic echo sounder sensor to the vehicle interior.

The status of the ultrasonic echo sounder sensor is monitored by the rear SAM control unit. If a defect is detected, the remaining ATA functions are still ensured regardless of this error. The corresponding fault codes are stored in the fault memory in the rear SAM control unit.

Function sequence for activating alarm siren 

The alarm siren is armed together with the ATA and checked cyclically approx. every t = 700 ms by the rear SAM control unit with rear SAM-LIN.

IMPORTANT Deactivating ATA:

The ATA is deactivated completely by opening the CL with transmitter key with infrared or radio or by switching on circuit 15C (valid transmitter key in EIS control unit). The EIS control unit transmits the corresponding signal via interior CAN to the rear control unit, which then activates the ATA.

REFER TO SYSTEM WIRING DIAGRAMS Function schematic for electric anti-theft alarm system, activation Model 216 PE80.50-P-2052-97CAA
  COMAND controller unit, component description A40/3
With code (526) COMAND with single DVD drive (without navigation) or
with code (527) COMAND APS with single DVD drive (with navigation)		 GF82.85-P-3136LE
With code (529) HIGH Class Japan GF82.85-P-3136LEJ
With code (530) COMAND APS USA (with navigation system) GF82.85-P-3136LEU
  Front central operating unit, component description A40/9 GF54.21-P-4500LE
  Rear SAM control unit with fuse and relay module, component description N10/2 GF54.21-P-6030LE
  Left door control unit, component description N69/1
Model 216		 GF72.29-P-4124LA
  Upper control panel control unit, component description N72/1 GF54.21-P-6040LE
  Component description for the EZS control unit N73 GF80.57-P-6003LE 
scientia non olet · About LEMON Manuals