Parking system, function - GF54.65-P-0006CE
MODEL 204.0/2 with CODE (220) PARKTRONIC as of Model Year 2009 /CY 08
MODEL 204.9 with CODE (220) PARKTRONIC
MODEL 204.0/2 with CODE (230) Advanced Parking Guidance as of model year 2012 /YoM 11 model refinement package
MODEL 204.3 with CODE (230) Advanced Parking Guidance
MODEL 204.9 with CODE (235) Active Park Assist as of model year 2013 /model refinement package 12
Function requirements, general
- Circuit 15 ON
The status of circuit 15 is sent by the electronic ignition lock control unit via the chassis CAN (model 204.0/2 as of 1.3.11, model 204.3, model 204.9 as of 1.6.12) or interior CAN (model 204.0/2 up to 28.2.11, model 204.9 up to 31.5.12) to the parking system control unit.
Parking system, general
The parking system uses an ultrasonic measuring system to record the distance of the vehicle to an obstacle. On vehicles with code (230) Exclusive Parking Assist, while the vehicle is in motion (v < 36 km/h), longitudinal parking spaces on both sides of the vehicle are measured and stored in the direction of travel.
The driver is assisted when parking by means of corresponding steering and driving instructions. The distance between the vehicle and the obstacle is indicated to the driver visually and acoustically.
Warnings from the parking system are disabled in some situations, e.g. when reversing into 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
- Status of reverse gear
- Parking brake status
Direction of travel and vehicle speed:
The direction of travel is defined by the wheel rotation direction.
The vehicle speed is calculated on the basis of the wheel speeds. Both values are detected by the rpm sensors.
The wheel rotation direction is only recorded by the driven wheels.
Model 204.0/2 as of 1.3.11, model 204.3, model 204.9 as of 1.6.12:
The Electronic Stability Program control unit reads in the signals from the rpm sensors directly and sends them via the chassis CAN to the parking system control unit and the instrument cluster.
The instrument cluster sends the displayed vehicle speed via the chassis CAN to the parking system control unit.
The parking system control unit defines the direction of travel and calculates the vehicle speed.
Model 204.0/2 up to 28.2.11, model 204.9 up to 31.5.12:
The Electronic Stability Program control unit sends the rpm sensor signals via the chassis CAN to the front SAM control unit and to the instrument cluster.
The front SAM control unit sends these signals via the interior CAN to the parking system control unit.
The instrument cluster sends the displayed vehicle speed via the interior CAN to the parking system control unit.
The parking system control unit defines the direction of travel and calculates the vehicle speed.
Status of reverse gear:
Transmission 711, 716
The status of the reverse gear is defined by the status of the backup lamp switch.
Model 204.0/2 as of 1.3.11, model 204.3, model 204.9 as of 1.6.12: The front SAM control unit reads in the status of the backup lamp switch directly and, when reverse gear is engaged, sends the "reverse gear engaged" status via the chassis CAN to the parking system control unit.
Model 204.0/2 up to 28.2.11, model 204.9 up to 31.5.12:
The front SAM control unit reads in the status of the backup lamp switch directly and, when reverse gear is engaged, sends the "reverse gear engaged" status via the interior CAN to the parking system control unit.
Transmission 722:
Each gear range is engaged by the electronic transmission control control unit (transmission 722.6) or through the fully integrated transmission control unit (transmission 722.9).
Model 204.0/2 as of 1.3.11, model 204.3, model 204.9 as of 1.6.12:
The electronic transmission control control unit or the fully integrated transmission control unit sends the "gear range R engaged" status via the drive train CAN, CDI control unit or ME-SFI control unit and chassis CAN to the parking system control unit.
Model 204.0/2 up to 28.2.11, model 204.9 up to 31.5.12:
The electronic transmission control control unit or the fully integrated transmission control unit sends the "gear range R engaged" status via the drive train CAN, CDI control unit or ME-SFI control unit, chassis CAN, front SAM control unit and interior CAN to the parking system control unit.
Parking brake status:
The status of the parking brake is detected by the parking brake indicator switch.
Model 204.0/2 as of 1.3.11, model 204.3, model 204.9 as of 1.6.12:
The front SAM control unit reads in the status of the parking brake indicator switch directly and sends it via the chassis CAN to the parking system control unit.
Model 204.0/2 up to 28.2.11, model 204.9 up to 31.5.12:
The front SAM control unit reads in the status of the parking brake indicator switch directly and sends it via the interior CAN to the parking system control unit.
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
- Activate and deactivate function sequence
- Function sequence for monitoring during reverse travel
- Function sequence for monitoring during forward travel
- Function sequence for parking space detection (with code (230) Exclusive Parking Assist or code (235) Active Parking Assist)
- Function sequence for displaying potential parking spaces (with code (230) Exclusive Parking Assist or code (235) Active Parking Assist)
- Function sequence for issuing steering and driving instructions (with code (230) Exclusive Parking Assist or code (235) Active Parking Assist)
- Function sequence for semi-automatic parking (with model 204.9 with code (235) Active Parking Assist)
Illustration of the principle for measuring procedure
Measuring procedure function sequence
The distance measurement is based on the ultrasound measurement system. During measurement, the distance sensors are actuated by the parking system control unit.
As a result of this these emit an ultrasonic signal.
The signal reflected by an obstacle is received and evaluated. Each distance of the vehicle to an obstacle is displayed to the driver via the instrument panel parking system warning indicator and the rear parking system warning indicator.
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. Reflected 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.
The parking system may not work correctly in some cases because of the functional principal (sending and receiving of ultrasound waves). So for example, when approaching a strong sound absorbent obstacle (e.g. a vehicle covered in snow) it is possible that false data may be displayed.
Monitoring ranges of distance sensors, shown on model 204.0
The distance sensors are activated according to the direction of travel. The appropriate distance sensors are activated with forward travel for monitoring the front area (A) and the corner protection area (B).
The appropriate distance sensors are activated with reverse travel for monitoring the front area, the corner protection area and the rear area (C).
The monitored front area amounts to a maximum of s = 100 cm (c) and the monitored rear area amounts to a maximum of s = 120 cm (e). If the distance of the vehicle to an obstacle is less than s = 20 cm (a1, c1), the parking system will not obtain any more defined data for technical reasons.
Below a speed of v = 36 km/h the parking space detection range (D) at the right and left of the vehicle is measured up to a distance of s = 400 to 450 cm (d), 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
- Parking system warning indicator
- Parking assist electrical lines
Parking system control unit self-test:
The parking system control unit performs a self test after the ignition is switched on (circuit 15 ON). The hardware of the parking system control unit is checked here for faults.
The status of the parking brake, the position of the gearshift lever (with transmission 711, 716) or the status of the gear range (with transmission 722) (reverse gear engaged or not) do not exert any influence on the parking system control unit's self test.
Distance sensor self-test:
A self-test of the distance sensors (e.g. for connection) is only performed when a distance sensor is "pulsed" (ultrasonic transmitting).
This depends on the status of the parking brake, the position of the gearshift lever (with transmission 711, 716) or on the status of the gear range (with transmission 722) (reverse gear engaged or not) and on the vehicle speed.
Distance sensor test for subsequent vibrations:
A distance sensor test for subsequent vibrations (acoustic-physical function of distance sensor) is only conducted when the speed v = 60 km/h is exceeded or dropped below.
After the self test all the light-emitting diodes on the parking system warning indicators are fully actuated for approx. t = 1 s.
If there are no malfunctions or errors, the two yellow horizontal "Stand by" bars illuminate on both parking system warning indicators at reduced brightness.
The background illumination of the parking system warning indicators is automatically adjusted to the ambient brightness.
The parking system control unit performs further self tests at regular intervals.
The following states can be recorded here:
- Operational problem
- System error(s)
With a malfunction or a system error, the parking system is deactivated and the display element in the parking system button in the upper control panel lights up.
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 indicated by the red light-emitting diodes of each actuated parking system warning indicator lighting up.
If a malfunction exists any longer, identification of the cause takes place during driving operation via a self test. If the malfunction is still present, this is interpreted as a system error.
A warning sound is not emitted.
System fault(s)
A system fault can have the following causes:
- Defective component
- Error in communication
- Overvoltage or undervoltage
If a system error is detected, the red light-emitting diodes light up on each actuated parking system warning indicator. An acoustic warning is also emitted for t = 2 s. After another t = 18 s the parking system switches off and a fault is entered into the fault memory of the parking system control unit.
The size of the license plate carriers attached on the bumper varies depending on the national version. Due to the different dimensions and shapes the parking system must be adapted to the particular circumstances. A diagnostic tester can be used to code the national version to prevent malfunctions caused by the license plate carrier.
Behavior in the event of overvoltage and undervoltage function sequence
The behavior of the parking system in the event of overvoltage or undervoltage can be seen 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 |
| Parking system warning indicators, dark | Parking system warning indicators, dark | No checking up of parking system warning indicators | Start pulse has no influence on parking system |
| No checking up if voltage is normal again | No checking up if voltage is normal again | - | No checking up of parking system warning indicators |
| LED in parking system ON button | LED in parking system ON button | - | - |
Additional function requirements for activation and deactivation
- Self-test completed successfully
- Drive position "D" or "R" engaged (for transmission 722)
If the parking brake is applied and the gear range "N" is engaged, the parking system remains active for t = 2 s and is then switched off automatically.
Activate and deactivate function sequence
The parking system can be manually deactivated or activated by pressing the parking system button in the upper control panel. The upper control panel control unit reads in the status of the parking system button directly and sends it via the instrument panel LIN to the front SAM control unit.
Model 204.0/2 as of 1.3.11, model 204.3, model 204.9 as of 1.6.12:
The front SAM control unit sends the status of the parking system button via the chassis CAN to the parking system control unit.
Model 204.0/2 up to 28.2.11, model 204.9 up to 31.5.12:
The front SAM control unit sends the status of the parking system button via the interior CAN to the parking system control unit.
If the parking system function is switched off manually using the parking system button, it is switched on again automatically after reactivation of circuit 15.
The intensity of the warning indicator illumination for an activated parking system changes to match the ambient brightness. To this end, the light sensor or the rain/light sensor detects the ambient brightness. The data from the light sensor or rain/light sensor is read in by the front SAM control unit via the wiper/inside rearview mirror LIN.
Model 204.0/2 as of 1.3.11, model 204.3, model 204.9 as of 1.6.12:
The front SAM control unit sends the data from the light sensor or rain/light sensor via the chassis CAN to the parking system control unit.
Model 204.0/2 up to 28.2.11, model 204.9 up to 31.5.12:
The front SAM control unit sends the data from the light sensor or rain/light sensor via the interior CAN to the parking system control unit.
If the light sensor or rain/light sensor determines that it is "Night", then the parking system warning indicators are actuated at 60 % brightness.
If the light sensor or rain/light sensor determines that it is "Day", then the parking system warning indicators are actuated at 100 % brightness.
When the parking system is deactivated, only the light-emitting diode in the parking system button lights up. When driving the parking system switches between v = 60 and 16 km/h into the "Standby mode", i.e. the parking system control unit, parking system warning indicators and the distance sensors are provided with power, but the parking system warning indicators are switched to "Dark".
The respective system states are available on a transmission-specific basis in the following table:
| Transmission 711, 716 Status | 1 | 2 | 3 | 4 | 5 | 6 | ||||
|---|---|---|---|---|---|---|---|---|---|---|
| Parking system button | OFF | ON | ON | ON | ON | ON | ||||
| LED in parking system button | ON | OFF | OFF | OFF | OFF | OFF | ||||
| Gearshift lever position | x | x | x | x | All reverse gear | Reverse gear | ||||
| v in km/h | x | ≥60 | 0 | Deceleration of > 60 down to less than 60 | ≤V U | ≤V U | ||||
| Parking brake applied | x | x | Yes | x | no | no | ||||
| RIZ signal (wheel pulse counter) | x | x | 0 (t ≥2 s) | x | x | x | ||||
| Front distance sensor (1) | inactive | inactive | inactive | active for test, then inactive | active | active | ||||
| Rear distance sensor (1) | inactive | inactive | inactive | active for test, then inactive | inactive | active | ||||
| Instrument panel parking system warning indicator (1) | Dark (2) | OFF | dark | active for test, then dark | ON | ON | ||||
| Rear parking system warning indicator (1) | dark | OFF | dark | active for test, then dark | dark | ON | ||||
| D "Drive" R Backward N Neutral P Park position V Current speed V U Lower speed limit (v = 16 km/h) V 0 Upper speed limit (v = 18 km/h) Off Supply voltage switched off active Supply voltage applied and in operation dark Parking system warning indicator powered, but switched to off INACTIVE Distance sensors supplied with power but still not transmitting ultrasound x Arbitrary condition/data
The distance sensors are not transmitting an ultrasound signal and the parking system warning indicator is dark. |
||||||||||
| Transmission 722 Status | 1 | 2 | 3 | 4 | 5 | 6 | 7 | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 4.1 | 4.2 | 4.3 | 4.4 | |||||||||||
| Parking system button | OFF | ON | ON | ON | ON | ON | ON | ON | ON | ON | ||||
| LED in parking system button | ON | OFF | OFF | OFF | OFF | OFF | OFF | OFF | OFF | OFF | ||||
| Selector lever position (gear range) | x | D, R or N | P | P | R | D | O | D, R or N | D | R or N | ||||
| v (in km/h) | x | ≥60 | x | x | x | x | x | Deceleration of > 60 down to less than 60 | ≤V U | ≤V U | ||||
| Parking brake applied | x | x | x | Yes | Yes | Yes | Yes | x | no | no | ||||
| Wheel pulse counter signal | x | x | x | 0 (t ≥2 s) | 0 (t ≥2 s) | 0 (t ≥2 s) | 0 (t ≥2 s) | x | x | x | ||||
| Front distance sensor (1) | inactive | inactive | inactive | active | inactive | active | active | active for test, then inactive | active | active | ||||
| Rear distance sensor (1) | inactive | inactive | inactive | active | active | inactive | active | active for test, then inactive | inactive | active | ||||
| Front parking system warning indicator on instrument panel (1) | Dark (2) | OFF | dark | dark | inactive | active | active for t = 2 s, then inactive | active for test, then dark | ON | ON | ||||
| Rear parking system warning indicator (1) | dark | OFF | dark | dark | active | inactive | active for t = 2 s, then inactive | active for test, then dark | dark | ON | ||||
| D "Drive" R Backward N Neutral P Park position V Current speed V U Lower speed limit (v = 16 km/h) V 0 Upper speed limit (v = 18 km/h) Off Supply voltage switched off active Supply voltage applied and in operation dark Parking system warning indicator powered, but switched to off INACTIVE Distance sensors supplied with power but still not transmitting ultrasound x Arbitrary condition/data
The distance sensors are not transmitting an ultrasound signal and the parking system warning indicator is dark. |
||||||||||||||
Additional function requirements for monitoring during reverse travel
- Vehicle speed v = 0 to 18 km/h or vehicle speed v = 16 to 0 km/h
- Backward movement of vehicle
- No trailer detected (with code (550) Trailer hitch)
Function sequence for monitoring during reverse travel
During reverse travel the areas in front of and behind the vehicle are monitored.
When the lower limit speed of v = 16 km/h is dropped below, the parking system enters measuring mode.
When obstacles are detected in front of or behind the vehicle, the driver is initially visually warned by the appropriate light-emitting diodes lighting up in the parking system warning indicators.
When a distance of s = 30 cm is dropped below, the warning is then intensified by an intermittent tone and subsequently by a continuous signal (see following tables).
When the upper speed limit of v = 18 km/h is exceeded, the parking system goes over into stand by mode again.
| Warning message (front monitoring range) | ||||
|---|---|---|---|---|
| Instrument panel parking system warning indicator | Warning chime | Distance (cm) | ||
| Distance sensor (B8/1, B8/6) | Distance sensor (B8/2, B8/3, B8/4, B8/5) | |||
| Visual | 1 (yellow) | - | - | < 100 |
| 2 (yellow) | - | - | < 80 | |
| 3 (yellow) | - | < 60 | < 65 | |
| 4 (yellow) | - | < 50 | < 50 | |
| 5 (yellow) | - | < 40 | < 40 | |
| Visual and acoustic | 6 (red) | Intermittent tone with f = 6 Hz | < 30 | < 30 |
| 7 (red) | Continuous signal | < 15 | < 20 | |
| Warning message (rear monitoring range) | ||||
|---|---|---|---|---|
| Rear parking system warning indicator | Warning chime | Distance (cm) | ||
| Distance sensor (B8/7, B8/10) | Distance sensor (B8/8, B8/9) | |||
| Visual | 1 (yellow) | - | - | < 120 |
| 2 (yellow) | - | - | < 95 | |
| 3 (yellow) | - | < 80 | < 75 | |
| 4 (yellow) | - | < 55 | < 55 | |
| 5 (yellow) | - | < 40 | < 40 | |
| Visual and acoustic | 6 (red) | Intermittent tone with f = 6 Hz | < 30 | < 30 |
| 7 (red) | Continuous signal | < 20 | < 20 | |
Additional function requirements for monitoring during forward travel
- Vehicle speed v = 0 to 18 km/h or vehicle speed v = 16 to 0 km/h
- Forward movement of vehicle
Function sequence for monitoring during forward travel
When driving forwards the area in front of the vehicle is monitored.
When the lower limit speed of
v = 16 km/h is dropped below, the parking system enters measuring mode.
When obstacles are detected in front of the vehicle the driver is initially visually warned by the lighting up of corresponding light-emitting diodes in the parking system warning indicators. When distance of s = 30 cm is dropped below, the warning is then intensified by an intermittent tone and subsequently by a continuous signal (see previous tables).
When the upper limit speed of v = 18 km/h is exceeded the parking assist system switches back to the standby mode.
Additional function requirements, parking space recognition
- Antilock braking system (ABS) and Electronic Stability Program (ESP®) have not intervened for t = 5 s
Parking space recognition function sequence (with code (230) Exclusive parking assist)
The parking space detection function is used for simple locating of suitable parallel 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.
At a speed of v = 0 to 18 km/h the parking system operates in mixed mode between obstacle and parking space detection. As of v > 18 km/h the parking system changes to the parking space detection function and is activated up to v = 36 km/h.
The range of outer front distance sensors amounts to a maximum of between s = 400 and 450 cm depending on environmental influences (e.g. rain, snowfall, air humidity, extreme temperature (T = -40 to +85°C), air pressure, hot engine air).
The data from the outer front distance sensors is 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.
For a parking space to be recorded by the parking system, it must be:
- Parallel to the direction of travel
- At least b = 150 cm wide
- At least 130 cm longer than the vehicle
Provided that a parking space is detected, the parking system requires confirmation of the activation message to proceed with parking. This is done by pressing the OK button in the left multifunction steering wheel button group.
The steering column tube module control unit reads in the control signals from the OK button via the steering wheel electronics and steering LIN and sends them via the chassis CAN to the parking system control unit.
Parking space recognition only recognizes a free space which is geometrically suitable for parking, not whether this free space actually also represents a parking space.
Illustration of the principle of parking space detection, shown on model 204.0
Trajectory specifies the path to be taken when driving into the parking space. The trajectory consists of two arcs.
Display of potential parking spaces function sequence (with code (230) Exclusive parking assist)
If the parking system searches for a parking space, a display is shown on the multifunction display of the instrument cluster in the shape of a P symbol (6). As soon as an appropriate parking space is detected by the parking system, a left directional arrow (8) or a right directional arrow (7) also appears, that indicates the side of the vehicle on which the parking space is located.
As of 1.6.12 the P symbol is displayed in color.
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 signal to activate the display in the instrument cluster is transmitted by the parking system control unit over the chassis 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 via the chassis CAN to the parking system control unit.
Changes to the parking situation after parking space detection are not considered by the parking system.
Additional function requirements for steering and driving instruction output (with code (230) Exclusive parking assist)
- Parking space detected
- Reverse gear engaged
- Activation information confirmed
Function sequence for steering and driving instruction output (with code (230) Exclusive parking assist)
If the parking system has recorded a parking space and the parking procedure is to be conducted, corresponding steering and driving instructions are issued through the multifunction display in the instrument cluster.
The displayed arrow symbol fills or empties according to the steering angle or the distance traveled.
The steering angle is detected by the steering angle sensor.
The steering column tube module control unit reads in the data from the steering angle sensor directly and sends it via the chassis CAN to the parking system control unit.
This calculates the required steering angle from the values read in and the calculated trajectory.
The distance traveled is calculated using the signals from the rpm sensors. The Electronic Stability Program control unit reads in the signals from the rpm sensors directly and sends them via the chassis CAN to the parking system control unit.
The parking system is active during the parking procedure.
If an obstacle is detected in the trajectory during the parking procedure, the instrument cluster issues a warning message via the multifunction display and actuates the internal warning buzzer. The warning mode is abandoned if the obstacle is removed or the obstacle position is passed.
The following displays are possible with steering and driving instructions:
The drive indicator "Please drive forwards" is also possible.
In the event of "oversteer", the message "Please correct left/right" is displayed in the multifunction display. The steering wheel image remains the same, only the arrow changes direction.
The message "Parking Guidance Completed" is displayed after the target position in the parking space is reached.
Additional function requirements for semiautomatic parking (with code (235) Active Parking Assist)
- Speed v < 10 km/h
Function sequence for semiautomatic parking (With code (235) Active Parking Assist)
Insofar as the Park Assist function was activated, the multifunction display shows the "Please accelerate and brake independently" message.
The driver can now take his hands off the steering wheel and regulate the vehicle longitudinal control using the accelerator and brake pedal.
The parking system control unit uses the size of the calculated parking space and the data from the steering angle sensor to calculate the appropriate steering angle.
The steering column tube module control unit reads in the data from the steering angle sensor directly and sends it via the chassis CAN to the parking system control unit.
The parking system control unit then sends corresponding steering commands via the chassis CAN to the electrical power steering control unit. The electrical power steering control unit actuates the requests to match the electric power steering actuator motor. The steering gear is used to mechanically convert the electric power steering actuator motor actuation into corresponding steering movements.
At the same time, the message indicating the gear range to the engaged or the gear to be engaged is output in the multifunction display. After each gear range change or gear change, the driver has to continue operating the accelerator and brake pedal until the final position is reached. At a speed of v = 7 km/h, the multifunction display shows the "Park Assist only up to 10 km/h" note.
If the vehicle (forwards or backwards) reaches a distance of s < 30 cm to the parking space boundary, this is notified to the driver by the first red light-emitting diode (LED) lighting up in the parking system warning indicator.
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 vehicle is aligned flush to the front or rear obstacle.
The inclined position of the vehicle in the parking space is corrected by the parking system in a maximum of five maneuvering movements.
The wheels are straightened once the parking procedure has been completed.
As soon as this end position is reached, the "Parking assistance completed - Take over vehicle" message is shown for a period of t = 5 s on the multifunction display.
A warning tone is additionally output by the warning buzzer.
The target position of the vehicle it generally as far back and deeply into the parking space as possible.
The following situations cause the Active Parking Assist to be deactivated:
- If the permissible speed of v = 10 km/h is exceeded
- Active intervention in the steering wheel ("Hands-on detection")
To this end, the electrical power steering control unit reads in the torque values for the electric power steering torque sensor directly and thereby detects active intervention in the steering wheel by the difference in torque
- Faulty CAN signals
- Driver's door and driver seat-belt buckle open at same time
If the Active Parking Assist is deactivated due to the listed situations, reactivation is only possible after the engaged gear or the gear range has been changed. 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.
The following messages are also shown on the multifunction display:
- "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"
| Electrical function schematic of parking system | Model 204.0/2 With code (230) Exclusive Parking Assist Model 204.3 With code (230) Exclusive parking assist |
PE54.65-P-2054-97FAA | |
| Model 204.0/2/9 with code (220) PARKTRONIC |
PE54.65-P-2054-97FAB | ||
| Model 204.9 with code (235) Active Parking Assist |
PE54.65-P-2054-97FAC | ||
| Overview of system components of parking assistance systems | GF54.00-P-9997CE |