Astra L4-1.8L (2009)
switched on. It is switched off by moving the lever in the opposite direction.
Horn Function
The SCCM control unit records the position of the horn button. This information is transmitted by the SCCM control unit to the UEC control unit via the
LS CAN.
Immobilizer Function (Immobilizer 3)
An immobilizer function (immobilizer 3) is incorporated into the SCCM control unit. The SCCM control unit communicates with the transponder in the
ignition key with the aid of the transponder aerial connected to it. It evaluates the transponder signal. Even if the ignition key is recognized as valid, the
identifiers of the REC, UEC, instrument panel cluster (IPC) control units are still checked. If at least 2 are recognized as valid components, the release
procedure continues and communication is carried out with the ECM control unit with ignition ON. The ECM control unit requests a start release from
the SCCM control unit. If release fails, the ignition key must be removed from the ignition lock so that the Key IN status can be detected again and a new
release procedure started by the transponder. The conversion from analogue to digital signals is carried out by the SCCM control unit.
Loudspeaker Function
At the request of the UEC, REC, PAS, PEPS, IPC, DIS, SDM, SLM or TPMS control units, the SCCM triggers an acoustic signal from the integral
loudspeaker. This signal is specific for each function. For example, the REC control unit may send a message to the SCCM indicating the frequency at
which the turn signal tone should be output (normal flash frequency or faster flash frequency if turn signal is faulty). Other functions involving the
sending of a sound output request to the SCCM control unit include parking light activated, door, boot or tailgate open, Park Assist, adaptive cruise
control, windscreen wiper switch off and deactivate transport mode.
Steering Wheel Controls Function (Optional Equipment)
The SCCM control unit records which button on the steering wheel controls has been actuated - if several buttons have been pressed at the same time, the
button with the greatest priority is always evaluated. This information is transmitted by the SCCM control unit to the DIS control unit via the CAN.
Some of this information is then forwarded to the radio control unit via the DIS interface.
Info Display Function (Optional Equipment)
The SCCM control unit records that the Info Display operating switch has been actuated. This information is transmitted by the SCCM control unit to the
DIS control unit via the CAN.
Steering Wheel Position Function
The SCCM module has a steering angle sensor. This sensor records the current steering angle or the current steering movement and transmits this
information to the SCCM control unit. The steering angle sensor signal is used internally by the SCCM control unit to reset the turn signal. The SCCM
control unit transmits the steering angle information to the ABS/ESP control unit via the HS CAN if the vehicle has ESP (optional). The EHPS also uses
this information. For the ESP version, the sensor is "multi-turn" capable, i.e. it can indicate the exact angular position across the entire steering range.
Vehicles without ESP are fitted with a simplified version which, after 360° starts again at 0.
Air Bag Firing Signal
The air bag firing circuit is connected through to the driver's air bag (to the ignition pellet) in the steering wheel via the contact unit of the SCCM control
unit.
Key Remote Control Function
The SCCM control unit has a receiver which converts the key remote control signal. The SCCM control unit evaluates this information and transmits it
to the REC via the CAN.
Main/dipped Beam Function
The SCCM control unit records the 2 positions of the main/dipped beam switch. This information is transmitted by the SCCM to the UEC control unit
via the CAN.
Key Locking Function
The key locking function is only active on vehicles with automatic transmission. The TCM control unit transmits the current selector lever position to the
SCCM control unit via the HS CAN. If the current selector lever position is P, the SCCM deactivates the key lock and the ignition key can be removed.
Starter Control Function
If the SCCM detects the "engine start" ignition key position, it sends a CAN message to the ECM to actuate the starter. After receiving this message, the
