Parking System, Function - GF54.65-P-0006LF
Model 217
up to model year 2018
Model 222
up to model year 2018
with code 235 (Parking Pilot with PARKTRONIC)
Function requirements, general
- Terminal 15 ON
The circuit 15 status is sent by the electronic ignition lock control unit over the suspension FlexRay to the parking system control unit.
Parking system, general
The parking system uses the ultrasonic measuring procedure to register the distance between the vehicle and an obstacle. When driving at speeds of v < 36 km/h, parallel and perpendicular parking spaces on both sides of the vehicle in the direction of travel are measured, stored and the vehicle is moved in and out of a parking space semi-automatically upon the request of the driver.
Semi-automatic exiting of perpendicular parking spaces is not available.
The instrument cluster and the rear parking system indicator notify the driver of the respective distance between the vehicle and the obstacle. A warning tone can also be emitted at the instrument cluster speaker.
In certain situations, warnings from the parking system are suppressed, e.g. when reversing through narrow passages (driveway). There is an obstacle within the detection range but, based on the current steering wheel position, a collision will not take place.
Parking system operation is dependent on speed and direction of travel, and therefore the following input factors have to be determined:
- Direction of travel and vehicle speed
- Driving stage engaged
Direction of travel and vehicle speed:
The direction of travel is defined using the wheel rotation direction. The vehicle speed is calculated on the basis of the wheel speeds.
The Electronic Stability Program control unit sends appropriate information over the suspension FlexRay to the parking system control unit and over the suspension FlexRay, electronic ignition lock control unit and the user interface CAN to the instrument cluster. The parking system control unit calculates the vehicle speed and defines the direction of travel. The instrument cluster also calculates the speed to be displayed and sends it to the parking system control unit over the user interface CAN, electronic ignition lock control unit and the suspension FlexRay.
Engaged drive position:
Gear range "R" is engaged through the fully integrated transmission control unit. The fully integrated transmission control unit then sends the "Gear range R engaged" status to the parking system control unit over the drive train CAN, powertrain control unit and the suspension FlexRay.
The parking system includes the following subfunctions:
- Measuring procedure function sequence
- Self-test function sequence
- Behavior in the event of overvoltage and undervoltage function sequence
- Deactivate and activate function sequence
- Function sequence for monitoring reverse travel
- Function sequence for monitoring forward travel
- Parking space recognition function sequence
- Function sequence for display of possible parking spaces on instrument cluster
- Function sequence for semi-automatic parking
- Function sequence for semi-automatic parking space exit
Illustration of the principle for measuring procedure
Measuring procedure function sequence
The parking system is based on the ultrasonic measuring procedure. The parking system control unit actuates the distance sensors directly.
These then emit ultrasonic waves. The ultrasonic waves reflected by an obstacle are received again by the distance sensors. The parking system control unit reads in the signals of the distance sensors directly and evaluates them. In principle a distinction is made between two measurements. On the one hand the direct measurement resulting from a direct echo and on the other hand the indirect distance measurement which is achieved via a cross echo (illustration of the principle). Echoes can usually also be received from adjacent distance sensors due to the large distance sensor detection angles; these are known as cross echoes. These occur at the obstacle due to scattered reflection. With the help of the triangulation method, the distance from the vehicle to an obstacle can be calculated from two echo signals. The propagation times of the signals from the direct measurement and from the cross measurement are required for this method. A long signal propagation time therefore corresponds to a large distance, and a short signal propagation time corresponds to a short distance to the obstacle.
The parking system's operating principle (sending and receiving sound waves) means that - in certain circumstances - it may not work properly. So, for example, when approaching a highly sound-absorbent obstacle (e.g. a vehicle covered in snow), it is possible that false data may be displayed.
Shown model 222.0
The distance sensors are activated according to the direction of travel.
The distance sensors responsible for monitoring the front area (A) and the front corner protection area (B) are activated when the vehicle is moving forward.
The distance sensors responsible for monitoring the rear corner protection area (C) and the rear area (D) are also activated when the vehicle is moving backward.
The monitored area at the front is a maximum of s = 100 cm.
The monitored area at the rear is a maximum of s = 120 cm.
If the distance between the vehicle and an obstacle is less than s = 20 cm (c, e), the parking system will for technical reasons no longer receive any defined data.
At a speed less than v = 36 km/h the parking space detection range at the right and left of the vehicle is measured in the horizontal depth up to a distance of s = 400 to 450 cm and stored for s = 15 m in the parking system control unit.
Self-test function sequence
During the self-test the following components are checked for proper operation:
- Parking system control unit
- Distance sensors
- Rear parking system indicator
- Parking system electrical lines
Parking system control unit self-test:
The parking system control unit runs a self test after the ignition is switched on (circuit 15 ON). The hardware of the parking system control unit is tested here.
Selecting gear range "R" does not have any impact on the self-test of the parking system control unit.
Distance sensor self-test:
A self-test of the distance sensors (e.g. for connection) is only run when a distance sensor is "pulsed" (activated) (ultrasonic waves are transmitted).
Engaging gear range "R" has an impact on the self-test of the distance sensors. If reverse gear or gear range "R" has been engaged, all distance sensors are tested. If reverse gear or gear range "R" has not been engaged, only the front distance sensors are tested.
Distance sensor test for subsequent vibrations:
A distance sensor test for subsequent vibrations (acoustic/physical function of the distance sensor) is performed cyclically.
Rear parking system indicator function test:
When the ignition is switched on (circuit 15 On), the parking system control unit fully actuates all display elements in the rear parking system display for approx. t = 1 s.
If there are no malfunctions or faults, the two yellow horizontal "standby" bars light up in the rear parking system display. The parking system control unit runs further self-tests at regular intervals.
The following states can be recorded here:
- Operational problem
- System error(s)
If a malfunction or system error occurs, the parking system is deactivated and the LED in the parking system button of the driver side instrument panel button group illuminates.
The parking system control unit then sends the corresponding request over the suspension FlexRay, electronic ignition lock control unit and the interior CAN to the front SAM control unit, which then actuates the LED for the parking system button in the driver side instrument panel button group over the instrument panel LIN.
Malfunction:
A malfunction can be caused by a temporary external disturbance (e.g. a jackhammer on a construction site, a steam jet or by driving through an automatic car wash). If a malfunction occurs during operation, this is displayed by the lighting up of the red display elements in the rear parking system indicator or of the red warning segments in the instrument cluster.
To do this, the parking system control unit actuates the rear parking system indicator directly or sends the request for displaying the parking system indicator in the instrument cluster to the instrument cluster over the suspension FlexRay, electronic ignition lock control unit and the user interface CAN.
If a malfunction persists, the cause thereof is identified while driving by means of a self-test. If the malfunction is still present, this is interpreted as a system error.
A warning sound is not emitted.
System error:
A system error can have the following causes:
- Defective component
- Error in communication
- Overvoltage or undervoltage
If a system error is detected, and depending on whether or not reverse gear or gear range "R" has been engaged, the red display elements in the rear parking system indicator or the red warning segments in the parking system indicator in the instrument cluster illuminate. An acoustic warning is also emitted for t = 2 s.
To do this, the parking system control unit actuates the rear parking system indicator directly or sends the request for displaying the parking system indicator in the instrument cluster to the instrument cluster over the suspension FlexRay, electronic ignition lock control unit and the user interface CAN. The parking system control unit also sends the request to output a warning over the suspension FlexRay, electronic ignition lock control unit and user interface CAN to the instrument cluster. The instrument cluster then actuates the external instrument cluster speaker directly. After another t = 3 s, the parking system switches off, a fault is entered in the fault memory of the parking system control unit and the LED in the parking system button illuminates. The parking system control unit then sends the corresponding request over the suspension FlexRay, electronic ignition lock control unit and the interior CAN to the front SAM control unit, which then actuates the LED for the parking system button in the driver side instrument panel button group over the instrument panel LIN.
If the system error occurs again after an ignition cycle, the described scenario is repeated.
The size of the license plate bracket attached to the bumper varies depending on the national version. Due to the different dimensions and shapes involved, the parking system must be adapted to the particular circumstances. The national version can be coded via the diagnosis tester in order to avoid malfunctions.
Behavior in the event of overvoltage and undervoltage function sequence
The parking system behavior in the event of overvoltage or undervoltage is shown in the following table.
| On-board power supply voltage U < 9.0 V | On-board power supply voltage U > 16.0 V | Undervoltage with reset | Undervoltage without reset (start pulse) |
|---|---|---|---|
| Parking system nonfunctional | Parking system nonfunctional | The function is activated again after a reset | Display of distance |
| Rear parking system indicator dark | Rear parking system indicator dark | No function test of the rear parking system indicator | Start pulse has no influence on the parking system |
| No function test, if voltage returns to normal | No function test, if voltage returns to normal | - | No function test of the rear parking system indicator |
| LED in the parking system button ON | LED in the parking system button ON | - | - |
Additional function requirements for activation and deactivation
- Self-test completed successfully
- Drive position "D" or "R" is engaged
Deactivate and activate function sequence
The parking system can be deactivated or activated manually by pressing the parking system button in the driver side instrument panel button group.
The front SAM control unit reads in the status of the parking system button over the instrument panel LIN and sends this over the interior CAN, electronic ignition lock control unit and the suspension FlexRay to the parking system control unit.
If the parking system has been manually switched off using the parking system button, it is automatically switched back on again when circuit 15 is reactivated.
The brightness of the display elements in the rear parking system indicator depends on the ambient brightness. The ambient brightness is detected by the light sensor in the rain/light sensor with additional functions. The rain/light sensor with additional functions reads in the signals of the light sensor directly, evaluates them and transmits information about the ambient brightness (dimness level) via the rain/light sensor LIN to the front SAM control unit. The front SAM control unit transmits this information over the interior CAN, the electronic ignition lock control unit and the suspension FlexRay to the parking system control unit. If the light sensor detects "Night", the rear parking system display is actuated at 60 % brightness. If the light sensor detects "Day", the rear parking system display is actuated at 100 % brightness.
When the parking system is deactivated, only the LED in the parking system button lights up. The parking system control unit sends a corresponding request over the suspension FlexRay, electronic ignition lock control unit and the interior CAN to the front SAM control unit, which then directly actuates the LED of the parking system button over the instrument panel LIN. When driving, the parking system switches to standby mode between v = 60 km/h and v = 16 km/h. In other words, the parking system control unit, the rear parking system indicator and the distance sensors are still supplied with power, but the rear parking system indicator is switched to "dark".
Additional function requirements for monitoring reverse travel
- Vehicle speed v = 0 to 18 km/h or vehicle speed v = 16 to 0 km/h (calculated from wheel speeds)
- Backward movement of vehicle (defined via the wheel rotation direction)
- No trailer recognized (with CODE 550 (Trailer hitch))
The "Trailer detected" status is transmitted by the trailer recognition control unit to the parking system control unit over the interior CAN, electronic ignition lock control unit and the suspension FlexRay.
Function sequence for monitoring reverse travel
During reverse travel the areas in front of and behind the vehicle are monitored. When the speed drops below the lower limit speed of v = 16 km/h, the parking system changes to measuring mode. When obstacles are detected in front of or behind the vehicle, the driver is first warned visually by the illumination of the display elements in the rear parking system display or the warning segments in the parking system display in the instrument cluster. When the distance drops below s = 30 cm, the warning is intensified first means of an intermittent tone and then by means of a continuous tone. When the speed exceeds the upper speed limit of v = 18 km/h, the parking system changes back to standby mode. The parking system control unit actuates the rear parking system indicator directly or sends the request for displaying the parking system indicator in the instrument cluster to the instrument cluster over the suspension FlexRay, electronic ignition lock control unit and the user interface CAN. If the distance from the obstacle is less than s = 30 cm, the parking system control unit sends the request to output a warning via the suspension FlexRay, the electronic ignition lock control unit and the user interface CAN to the instrument cluster. The instrument cluster then actuates the external instrument cluster speaker directly.
Additional function requirements for monitoring forward travel
- Vehicle speed v = 0 to 18 km/h or vehicle speed v = 16 to 0 km/h (calculated from wheel speeds)
Function sequence for monitoring forward travel
When driving forwards the area in front of the vehicle is monitored. When the speed drops below the lower limit speed of v = 16 km/h, the parking system changes to measuring mode. When obstacles are detected in front of the vehicle, the driver is first warned visually by the illumination of the warning segments of the parking system indicator in the instrument cluster. When the distance drops below s = 30 cm, the warning is intensified first means of an intermittent tone and then by means of a continuous tone. When the speed exceeds the upper speed limit of v = 18 km/h, the parking system changes back to standby mode. The parking system control unit sends the request to show the parking system display in the instrument cluster to the instrument cluster over the suspension FlexRay, electronic ignition lock control unit and the user interface CAN. If the distance from the obstacle is less than s = 30 cm, the parking system control unit sends the request to output a warning via the suspension FlexRay, the electronic ignition lock control unit and the user interface CAN to the instrument cluster. The instrument cluster then actuates the external instrument cluster speaker directly.
Additional function requirements, parking space recognition
- Ant-lock braking system (ABS) and Electronic Stability Program (ESP®) have not intervened for t = 5 s
- Vehicle speed v < 6 km/h (calculated from wheel speeds)
The Electronic Stability Program control unit sends the status of the ESP® over the suspension FlexRay to the parking system control unit.
Parking space recognition function sequence
The parking space detection function is used for simple locating of suitable parallel or perpendicular parking spaces. The parking space detection function is implemented via the outer front distance sensors. These monitor the area left and right of the vehicle and therefore have a larger range than the rest of the distance sensors.
In a vehicle speed range of v = 0 tos 18 km/h, the parking system operates in mixed mode between obstacle and parking space detection. As from a v > 18 km/h the parking system goes into the parking space detection and it is active up to v = 36 km/h.
Shown model 222.0
Depending on environmental influences (e.g. rain, snowfall, air humidity, extreme temperatures of, for example, T = -40 or +85°C, air pressure, hot engine air), the max. range of the outer front distance sensors lies between s = 400 and 450 cm.
The data from the front outer distance sensors are read in and evaluated by the parking system control unit. It is calculated whether the parking space is suitable for the vehicle from the stored vehicle dimensions and deviations of the recorded parking space.
Minimum size of a parallel parking space (parallel to the direction of travel):
- At least s = 150 cm wide
- At least s = 100 cm longer than the vehicle.
Minimum size of a perpendicular parking space:
- A minimum vehicle width of + s = 100 cm
- A maximum vehicle width of + s = 250 cm
For parallel and perpendicular parking, two boundary points are always required.
After the driver has engaged the gear range "R", the instrument cluster shows the prompt "Start Park Assist?" and the "Pay attention to surroundings" warning message is shown. The OK button for "Yes" (activate) and/or the "Back" button for "No" (do not activate) symbol also appears in the instrument cluster. The driver can then start or cancel the Active Parking Assist function using the left multifunction steering wheel button group.
The steering wheel electronics directly reads in the control signals from the left multifunction steering wheel button group and transmits this via the steering LIN to the steering column tube module. The steering column tube module control unit sends the control signals over the suspension FlexRay, electronic ignition lock control unit and the user interface CAN to the instrument cluster. Depending on each acknowledged message, the instrument cluster sends the status of the Active Parking Assist to the parking system control unit over the user interface CAN, electronic ignition lock control unit and the suspension FlexRay.
Active Park Assist detects an empty space which is geometrically suitable for parking. However, it cannot detect whether the empty space is actually a parking space.
The trajectory, which consists of two arcs, forms the path to be taken into the parking space.
Illustration showing principle of parking space detection; shown on model 222.0
Parking space detection display in the instrument cluster (for curbside parking space in direction of travel at right), shown on model 222
Additional function requirements for display of possible parking spaces on instrument cluster
- Transmission not in neutral position or gear range "D" engaged
- Vehicle speed v = 0 up to 30 km/h (calculated from wheel speeds)
The fully integrated transmission control unit sends the currently engaged gear range over the drive train CAN, powertrain control unit and the suspension FlexRay to the parking system control unit.
Function sequence for display of possible parking spaces on instrument cluster
When Active Parking Assist is searching for a parking space, a P symbol (6) is shown on the instrument cluster. As soon as an appropriate parking space is detected by Active Parking Assist, a left directional arrow (7) or a right directional arrow (8) also appears in addition to this symbol that indicates the side of the vehicle on which the parking space is located.
Parking spaces are always looked for on both sides of the vehicle. However, only parking spaces on the passenger side are pointed out by default. To also allow parking spaces on the driver side to be displayed, the driver must actuate the turn signal in the appropriate direction.
The parking system control unit sends the request to activate the display in the instrument cluster over the suspension FlexRay, the electronic ignition lock control unit and the user interface CAN to the instrument cluster.
The steering column tube module control unit reads in the switch position of the combination switch directly, and sends it over the suspension FlexRay to the parking system control unit.
Changes to the parking situation after parking space detection are not considered by Active Park Assist.
Additional function requirement for semi-automatic parking
- Speed v < 10 km/h (without code 498 (Japan version)) or v < 7 km/h (with code 498 (Japan version)) (calculated from wheel speeds)
- Suitable parallel and perpendicular parking space detected
Function sequence for semi-automatic parking
If the Active Park Assist has detected a suitable parallel or perpendicular parking space and the parking procedure has started, various driving instructions and messages are shown to the driver in the instrument cluster. The driver can now take the hands off the steering wheel. The Active Park Assist steers the vehicle into the parking space by means of targeted steering movements. All the driver has to do is accelerate.
The parking system control unit calculates the required steering angle from the size of the parking space and the position in relation to the space. The actual steering angle is recorded by the steering wheel angle sensor. The steering column tube module control unit reads in the data from the steering wheel angle sensor directly and sends information about the steering angle over the suspension FlexRay to the parking system control unit. The parking system control unit sends corresponding steering commands over the suspension FlexRay to the electrical power steering control unit. The electrical power steering control unit then actuates the electric power steering actuator motor accordingly. The steering gear converts the rotation movement of the electric power steering actuator motor into a parallel movement. The parking system control unit monitors the gear rack travel of the steering gear when this takes place. This is recorded by the electric power steering torque sensor. The electrical power steering control unit reads in the signals from the electric power steering torque sensor directly and sends information about the steering rack movement of the steering gear over the suspension FlexRay to the parking system control unit.
In order to output the driving instructions and messages, the parking system control unit sends appropriate requests over the suspension FlexRay, the electronic ignition lock control unit and the user interface CAN to the instrument cluster.
The following driving instructions or messages can be displayed:
- "Park Assist active - Please accelerate independently, pay attention to surroundings"
- "Park Assist Active - Please engage gear range R"
- "Park Assist Active - Please engage gear range D"
- "Park Assist terminated - Please take over"
- "Park Assist terminated"
- "Park Assist nonfunctional"
- "Park Assist only up to 10 km/h" (without code 498 (Japan version))
- "Park Assist only up to 7 km/h" (with code 498 (Japan version))
Following a gear range change, the driver must move the vehicle until it brakes automatically (maneuvering point or target parking position reached).
Reverse travel or forward travel monitoring is active during parking. The Electronic Stability Program control unit calculates the required braking torque and actuates the traction system hydraulic unit accordingly upon reaching the maneuvering points or the target parking position. In order to do this, the parking system control unit sends information about the remaining distance to the defined obstacle over the suspension FlexRay to the Electronic Stability Program control unit.
Any changes to the remaining distance to the obstacle are also taken into account (e.g. a person walking into the path of the vehicle). Depending on the current driving situation, however, it is not always possible to prevent a collision in such cases.
Delimitation at the side of the parking space is defined by a recognized obstacle (e.g. a curb or pole). If an obstacle is not detected at the side, the active parking assist aligns the vehicle flush with the front or rear obstacle.
When doing this, the angled position of the vehicle in the parking space is corrected by means of appropriate maneuvering movements.
The wheels are moved to the straight ahead position once the parking procedure has been completed. As soon as the vehicle is secured, the message "Park Assist complete - Please take over" appears for t = 5 s in the instrument cluster. In addition, the instrument cluster actuates the external instrument cluster speaker. A warning tone sounds.
The vehicle is secured by engagement of drive range "P" by the driver or by the standstill control in the Electronic Stability Program control unit.
The target position of the vehicle it generally as far back and deeply into the parking space as possible.
The following situations will result in deactivation of the Active Parking Assist:
- Exceeding the permissible speed
- Turning the steering wheel ("hands-on detection");
To do this, the electrical power steering control unit directly reads in the torque values of the electric power steering torque sensor and recognizes that the steering wheel is actively turned based on the torque difference. In this case, the electrical power steering control unit sends a corresponding status information to the parking system control unit over the suspension FlexRay.
- Defect on an electrical component in the power steering
- Defect on an electric or hydraulic component of the brake system
- Faulty CAN signals
- Driver's door and driver seat-belt buckle open at same time
- Parking system deactivation
In the event of a deactivation of Active Parking Assist because of the listed circumstances, a reactivation requires a change of gear range. If the vehicle is out of the previously calculated trajectory, then the vehicle must be manually returned to the starting position, from which a new trajectory can then be calculated.
Additional function requirements for semi-automatic exit of parking space
- Vehicle has been parked semi-automatically
- Semi-automatic parking space exit function is activated in "Park Assist" menu of instrument cluster
- Speed v < 10 km/h (without code 498 (Japan version)) or < 7 km/h (with code 498 (Japan version)) (calculated from wheel speeds)
The instrument cluster sends the status of the Park Assist to the parking system control unit over user interface CAN, electronic ignition lock control unit and the suspension FlexRay.
Function sequence for semi-automatic parking space exit
The semi-automatic parking space exit function must be preceded by semi-automatic parking of the vehicle. This ensures that the vehicle is positioned parallel to a parking space boundary. This information is required as the Park Assist first requests "straight to the rear" vehicle movement to exit the parking space. If the vehicle was positioned in the parking space at an angle, the rims could be damaged by the curb, for example.
The semi-automatic parking space exit function is activated by actuating the turn signal indicator in the direction (left or right) in which the parking space is to be exited. The steering column tube module control unit reads in the switch position of the combination switch directly, and sends it over the suspension FlexRay to the parking system control unit. The parking system control unit also evaluates the engaged gear range. If the gear range "R" is not engaged, the parking system control unit sends a "Start Park Assist?" prompt to the instrument cluster over the suspension FlexRay, electronic ignition lock control unit and the user interface CAN. The OK button for "Yes" (activate) and/or the "Back" button for "No" (do not activate) symbol appears in the instrument cluster. The driver can then start or cancel the Active Parking Assist function using the left multifunction steering wheel button group. The steering wheel electronics directly reads in the control signals from the left multifunction steering wheel button group and transmits this via the steering LIN to the steering column tube module. The steering column tube module control unit sends the control signals over the suspension FlexRay, electronic ignition lock control unit and the user interface CAN to the instrument cluster. Depending on each acknowledged message, the instrument cluster sends the status of the Active Parking Assist to the parking system control unit over the user interface CAN, electronic ignition lock control unit and the suspension FlexRay.
Parking space exit in left direction of travel displayed in instrument cluster, shown on model 222.0
This process (parking space exit (9)) is visualized in the instrument cluster to match the driver request (exit parking space to left or right).
After starting the parking space exit procedure, various driving instructions or messages are shown to the driver in the instrument cluster. The driver can now take the hands off the steering wheel. The Active Parking Assist steers the vehicle out of the parking space by means of targeted steering movements. All the driver has to do is accelerate.
The parking system control unit sends corresponding steering commands over the suspension FlexRay to the electrical power steering control unit.
Then the electric power steering control unit actuates the electric power steering actuator motor correspondingly (full steering angle). The steering gear converts the rotation movement of the electric power steering actuator motor into a parallel movement. The parking system control unit monitors the gear rack travel of the steering gear when this takes place. This is recorded by the electric power steering torque sensor. The electrical power steering control unit reads in the signals from the electric power steering torque sensor directly and sends information about the steering rack movement of the steering gear over the suspension FlexRay to the parking system control unit.
In order to output the driving instructions and messages, the parking system control unit sends appropriate requests over the suspension FlexRay, the electronic ignition lock control unit and the user interface CAN to the instrument cluster.
The following driving instructions or messages can be displayed:
- "Park Assist Active - Please accelerate independently, pay attention to surroundings"
- "Park Assist Active - Please engage gear range D"
- "Park Assist Active - Please engage gear range R"
- "Park Assist terminated - Please take over"
- "Park Assist terminated"
- "Park Assist nonfunctional"
- "Park Assist only up to 10 km/h" (without code 498 (Japan version))
- "Park Assist only up to 7 km/h" (with code 498 (Japan version))
Following a gear range change, the driver must move the vehicle until it brakes automatically (maneuvering point reached).
Reverse travel or forward travel monitoring is active during parking space exiting.
The Electronic Stability Program control unit calculates the required braking torque and actuates the traction system hydraulic unit accordingly when the maneuvering points are reached. In order to do this, the parking system control unit sends information about the remaining distance to the defined obstacle over the suspension FlexRay to the Electronic Stability Program control unit.
When the Active Parking Assist has positioned the vehicle so that the driver can drive directly out of the parking space, the parking system control unit sends a request to output the message "Park Assist completed - Take over vehicle" to the instrument cluster over the suspension FlexRay, the electronic ignition lock control unit and the user interface CAN.
The following situations lead to deactivation of the Active Park Assist:
- Exceeding the permissible speed
- Turning the steering wheel ("hands-on detection");
To do this, the electrical power steering control unit directly reads in the torque values of the electric power steering torque sensor and recognizes that the steering wheel is actively turned based on the torque difference. In this case, the electrical power steering control unit sends a corresponding status information to the parking system control unit over the suspension FlexRay.
- Defect on an electrical component in the power steering
- Defect on an electric or hydraulic component of the brake system
- Faulty CAN signals
- Driver's door and driver seat-belt buckle open at same time
- Parking system deactivation
| Electrical function schematic of parking system | PE54.65-P-2054-97SEA | ||
| Overview of system components of parking assistance systems | GF54.00-P-9997LF |