STEERING COLUMN LOCK
Note. The steering column lock module (SCL) is only available on model year 2004-2008 for the USA/CDN market and model year 2004- for other markets.
The central electronic module (CEM) and steering column lock module (SCL) are part of the steering wheel lock function. The power supply to the steering column lock module (SCL) is controlled by the central electronic module (CEM). The steering column lock module (SCL) also receives commands from the central electronic module (CEM) to lock or unlock the steering wheel lock. The function of the steering wheel lock is limited when the vehicle is stationary and the engine is off.
Whilst the vehicle is being driven, the central electronic module (CEM) monitors the communication cable to the steering column lock module (SCL). If the central electronic module (CEM) detects that the steering column lock module (SCL) starts communicating when it should not be powered, the central electronic module (CEM) will display an warning message in the driver information module (DIM) and will attempt to disengage the steering column lock.
Unlocking
If the keyless vehicle module (KVM) (cars with the keyless entry system only) and central electronic module (CEM) receive a signal from the key-in switch, the identity of the key is checked. This is done either via the keyless system or via the ignition switch. At the same time, the central electronic module (CEM) activates the power supply to the steering column lock module (SCL). After approved validation of the key, the central electronic module (CEM) checks that the engine is not running via CAN signals from the engine control module (ECM). The central electronic module (CEM) also checks that the vehicle is not moving via the CAN signals from the brake control module (BCM) or transmission control module (TCM). If the conditions are met, the central electronic module (CEM) transmits an unlock command to the steering column lock module (SCL). The steering column lock module (SCL) then attempts to unlock the steering wheel lock. If everything is OK, the steering column lock module (SCL) transmits two signals back to the central electronic module (CEM). One signal indicates that the steering column lock module (SCL) has not detected any internal faults and is functioning as intended. The other signal indicates that the spring bolt has moved to the unlocked position. The central electronic module (CEM) will then store an internal value for successful unlocking and then continues with the checks for the immobilizer system.
If the steering wheel lock does not unlock the first time, the steering column lock module (SCL) will make a further two unlocking attempts. If these also fail, the steering column lock module (SCL) will transmit a message about the fault to the central electronic module (CEM). The central electronic module (CEM) will then store a diagnostic trouble code (DTC) and the checks for the immobilizer system will be cancelled. It will not then be possible to start the engine.
Locking
The following applies to vehicles without the keyless entry system
Whilst the vehicle is in use, the central electronic module (CEM) checks the input signals from the contact breakers for the start control module (SCU) which indicate the position of the ignition key. When the central electronic module (CEM) detects via these contact breakers that the ignition key has been turned to the 0 position and removed from the ignition, the central electronic module (CEM) initiates a locking sequence.
The following applies to vehicles with the keyless entry system
Whilst the vehicle is in use, the central electronic module (CEM) checks the input signals from the contact breakers for the start control module (SCU) which indicate the position of the starter button. When the central electronic module (CEM) detects, via these contact breakers, that the starter button has been turned to the 0 position and the key-in switch has been deactivated, the central electronic module (CEM) is ready to initiate a locking sequence. During passive starting, the steering column lock is not engaged before the driver's door is opened for safety reasons.
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The central electronic module (CEM) then checks that the engine is not running via the CAN signals from the engine control module (ECM). The central electronic module (CEM) also checks that the vehicle is not moving via the CAN signals from the brake control module (BCM) or transmission control module (TCM). If the conditions are met, the central electronic module (CEM) powers the steering column lock module (SCL) and then transmits a lock command to it. The steering column lock module (SCL) sends signals back indicating whether locking was successful or not. The central electronic module (CEM) will store a diagnostic trouble code (DTC) if locking has failed after 3 attempts.
Scheme 223
The start inhibition system is a comprehensive function of the vehicle security system. The logic for start inhibition is in the engine control module (ECM). The system for start inhibition reads off a number of values from the controller area network (CAN). These values are used to determine whether the criteria for the engine control module (ECM) to activate the starter motor are met. The system for start inhibition reads off whether the immobilizer check is OK or not. For further information, see: START INHIBITION
There are a number of functions in the cars security system
- Immobilizer
- Steering wheel lock
- Key lock
- Key warning.
- Alcolock (option 2009-)
- Remote-controlled immobilization (2010-, option, only certain markets)
The various functions depend on different control modules and components.
The following are included in the immobilizer system
- Central electronic module (CEM)
- Keyless vehicle module (KVM) (only vehicles with the keyless entry system)
- Start control module (SCU)
- Steering Column Lock Module (SCL) (does not apply to USA/CDN market for 2009-).
- Engine control module (ECM)
- Brake control module (BCM)
- Driver information module (DIM)
- Phone module (PHM) (only vehicles with remote-controlled immobilization).
The following are included in the steering column lock system
- Central electronic module (CEM)
- Steering Column Lock Module (SCL) (does not apply to USA/CDN market for 2009-).
- Engine control module (ECM)
- Brake control module (BCM)
- Transmission control module (TCM)
The following are included in the key lock system
- Central electronic module (CEM)
- Start control module (SCU)
- Transmission control module (TCM)
The following are included in the key warning system
- Central electronic module (CEM)
- Driver information module (DIM)
The alcolock system (option 2009-) includes
- Central electronic module (CEM)
- Driver information module (DIM)
- Remote Receiver Module (RRX)
For further information about the different functions, see: FUNCTION
Definitions
Activated system: The system means that the vehicle cannot be started.
Deactivated system: Key check has been carried out and the key has been approved. The system permits the car to start.
The tables below summarize the input and output signals to the units in the system for the immobilizer. The signal types are divided into directly connected signals, serial communication and controller area network (CAN) communication.
| Input signals | Output signals |
|---|---|
| Directly connected | Directly connected |
| Signal (12V) from the key-in switch when the key is in the ignition Input signals from the switches for the different key positions (I, II, III) in the ignition switch. Switch at the clutch pedal which indicates when the pedal is pressed (USA/CAN only, vehicles with manual transmissions). | Voltage supply to the Steering Column Lock Module (SCL) (does not apply to USA/CDN market for 2009-). Ground connection to the coil for the key lock function in the ignition switch. |
| Via serial communication (LIN) | Via serial communication (LIN) |
| Start control module (SCU) for communication with the key Steering Column Lock Module (SCL) with information about the steering column lock status (does not apply to the USA/CDN market for 2009-). Remote Receiver Module (RRX) for communication with keys and the alcolock's (option 2009-) handset unit (only vehicles without the keyless lock system). | Start control module (SCU) for communication with the key Steering Column Lock Module (SCL) for locking and unlocking commands (does not apply to the USA/CDN market for 2009-). Remote Receiver Module (RRX) for communication with keys and the alcolock's (option 2009-) handset unit (only vehicles without the keyless lock system). |
| Via CAN communication (LS-CAN) | Via CAN communication (LS-CAN) |
| Keyless vehicle module (KVM) to check the identity of the key and approve vehicle start (only vehicles with the keyless entry system). Phone module (PHM) (16/60) (only vehicles with remote-controlled immobilization). | Driver information module (DIM) for displaying messages. Keyless vehicle module (KVM) to check the identity of the key and approve vehicle start (only vehicles with the keyless entry system). Phone module (PHM) (16/60) (only vehicles with remote-controlled immobilization). |
| Via CAN communication (HS-CAN) | Via CAN communication (HS-CAN) |
| Engine control module (ECM) with information about the engine status and for the immobilizer function. Brake control module (BCM), with information about the vehicle's speed. Transmission control module (TCM) with information about vehicle speed and the position of the gear selector. | Engine control module (ECM) for communication and checking identity. |
CENTRAL ELECTRONIC MODULE (CEM) (4/56)
| Input signals | Output signals |
|---|---|
| Directly connected | Directly connected |
| Lock buttons on the handles on the side doors, for locking. Unlocking switch in the handles on the side doors, indicates that the door handle has been pulled out Unlocking contact breaker for the cargo compartment, indicates that the unlock button is pressed in. Quick lock motor contact breaker in the side doors, the motors can be activated Key-in contact breaker, indicates that the start knob is pressed in. Central electronic module (CEM), signal which indicates that the brake pedal is pressed Clutch switch (MAN), indicates that the clutch pedal is pressed | Internal antenna 1, for communication with a key in the passenger compartment Internal antenna 2, for communication with a key in the passenger compartment Antenna in the cargo compartment, for communication with keys External antenna left front, for communication with key External antenna right front, for communication with key External antenna left rear, for communication with key External antenna right rear, for communication with key External rear antenna, for communication with keys Quick lock motor left front, for opening the door. Quick lock motor right front, for opening the door. Quick lock motor left rear, for opening the door. Quick lock motor right rear, for opening the door. |
| Via serial communication | Via serial communication |
| Remote keyless entry (RKE) receiver (4/103), for receiving data from keys. | Remote keyless entry (RKE) receiver (4/103), control commands |
| Via Controller Area Network (CAN) communication | Via Controller Area Network (CAN) communication |
| Central electronic module (CEM) (4/56) Infotainment control module (ICM) (16/1) when changing customer parameters. | Central electronic module (CEM) (4/56) Driver information module (DIM) (5/1). Infotainment control module (ICM) (16/1) when changing customer parameters. |
KEYLESS VEHICLE MODULE (KVM) (4/93) (ONLY VEHICLES WITH THE KEYLESS LOCKING SYSTEM)
| Input signals | Output signals |
|---|---|
| Directly connected | Directly connected |
| Power supply from the central electronic module (CEM). | |
| Via serial communication (LIN) | Via serial communication (LIN) |
| Central electronic module (CEM) for communication when locking and unlocking the steering column lock. | Central electronic module (CEM) for communication when locking and unlocking the steering column lock. Central electronic module (CEM) for information about the status of the steering column lock. |
STEERING COLUMN LOCK MODULE (SCL) (4/102) (DOES NOT APPLY TO USA/CDN MARKET FOR 2009-).
| Input signals | Output signals |
|---|---|
| Directly connected | Directly connected |
| Power supply from the key-in switch. | |
| Via serial communication (LIN) | Via serial communication (LIN) |
| Central electronic module (CEM) for communication with the key. | Central electronic module (CEM) for communication with the key. |
START CONTROL MODULE (SCU) (3/1)
| Input signals | Output signals |
|---|---|
| Via Controller Area Network (CAN) communication | Via Controller Area Network (CAN) communication |
| Serial number from the Brake control module (BCM). Communication with the central electronic module (CEM) during start attempts. | Information about the engine status Communication with the central electronic module (CEM) during start attempts. Communication with the brake control module (BCM) during start attempts. |
ENGINE CONTROL MODULE (ECM) (4/46)
| Input signals | Output signals |
|---|---|
| Via Controller Area Network (CAN) communication | Via Controller Area Network (CAN) communication |
| Inquiry about the serial number from the engine control module (ECM) during start attempts. | Information about vehicle speed. Serial number and P/N to the engine control module (ECM). |
BRAKE CONTROL MODULE (BCM) (4/16)
| Input signals | Output signals |
|---|---|
| Via Controller Area Network (CAN) communication | Via Controller Area Network (CAN) communication |
| Information about vehicle speed. Information about the position of the gear selector. |
TRANSMISSION CONTROL MODULE (TCM) (4/28)
| Input signals | Output signals |
|---|---|
| Via Controller Area Network (CAN) communication | Via Controller Area Network (CAN) communication |
| From the central electronic module (CEM) with information about which message must be displayed. |
DRIVER INFORMATION MODULE (DIM) (5/1).
| Input signals | Output signals |
|---|---|
| Via Controller Area Network (CAN) communication | Via Controller Area Network (CAN) communication |
| From Central electronic module (CEM) (4/56) with information on remote-controlled immobilization. | To Central electronic module (CEM) (4/56) with information on remote-controlled immobilization. |
PHONE MODULE (PHM) (16/60)
Scheme 224
The infotainment control module (ICM) consists of a display and printed circuit board. The display is connected via a cable direct to the printed circuit board.
The display shows information about the function which is active. It also displays information when selecting functions and preferences for the system. The graphic display consists of a field with 128*64 pixels.
The printed circuit board has an input for display and input and outputs for
- power supply
- ground
- The controller area network (CAN)
- LIN communication and
- the MOST network.
The processor for the infotainment control module (ICM) is on the printed circuit board. Therefore the printed circuit board contains all the functionality and logic for the infotainment control module (ICM). The printed circuit board also stores the software for the infotainment control module (ICM).
When replacing the control module reprogramming is required.
The control module can be diagnosed.
Scheme 225
There is a remote control for the infotainment system. It is used for remote control of the navigation system. The remote control can be used to activate most of the functions that are controlled via the keypads on the climate control module (CCM) and via the buttons on the steering wheel.
The remote control transmits signals via the IR signals to the receiver unit which is located in the grille for the center loudspeaker in the dashboard. The signals then continue via the directly connected cable to the infotainment control module (ICM) which controls the selected function.
Scheme 226
The infotainment control module (ICM) consists of a display and printed circuit board. The display is connected via a cable direct to the printed circuit board.
The display shows information about the function which is active. It also displays information when selecting functions and preferences for the system. The graphic display consists of a field with 128*64 pixels.
The printed circuit board has an input for display and input and outputs for
- power supply
- ground
- The controller area network (CAN)
- LIN communication and
- the MOST network.
The processor for the infotainment control module (ICM) is on the printed circuit board. Therefore the printed circuit board contains all the functionality and logic for the infotainment control module (ICM). The printed circuit board also stores the software for the infotainment control module (ICM).
When replacing the control module reprogramming is required.
The control module can be diagnosed.
Scheme 227
There is a remote control for the infotainment system. It is used for remote control of the navigation system. The remote control can be used to activate most of the functions that are controlled via the keypads on the climate control module (CCM) and via the buttons on the steering wheel.
The remote control transmits signals via the IR signals to the receiver unit which is located in the grille for the center speaker in the dashboard. The signals then continue via the directly connected cable to the infotainment control module (ICM) which controls the selected function.