2021-2026 Audi RS E Tron Gt 4 Door Safety and driver assist systems -> Park assist plus User Manual
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Safety and driver assist systems -> Park assist plus for Your Audi RS E Tron Gt 4 Door First Generation (2021-2026)

Convenience CAN  
Infotainment CAN  
Dash panel insert CAN  
Information electronics 1 CAN  
FlexRay  
The illustration shows the control units that are involved in the maneuver assist. The main tasks of the individual control units are  
explained below. The master control unit for the maneuver assist is driver assist systems control unit J1121.  
Control units and their tasks  
Driver assist systems control unit J1121  
Is the master control unit for the maneuver assist  
Is the master control unit for the parking aid  
Reads in the sensor signals from the ultrasonic sensors and evaluates them  
Receives the camera images from the four overhead view cameras and processes them  
Extracts objects from the camera images received from the overhead view cameras and localises them within the technical limits  
Enters all available sensor data in a shared internal map (sensor data fusion)  
Initiates braking to bring the vehicle to a standstill in critical situations via control unit J104  
Initiates corresponding displays for the maneuver assist on the MMI and in the instrument cluster  
ABS control unit J104  
Implements braking interventions requested by the system  
Keeps the vehicle stationary after a protective braking intervention has brought it to a standstill  
Automatic gearbox control unit J217  
Transmits the current transmission position (the maneuver assist is always deactivated in transmission position N so as to  
avoid protective braking when the vehicle is inside a car wash)  
Adaptive cruise control unit J428  
Transmits whether the adaptive cruise assist is currently active. The maneuver assist must be deactivated when the adaptive  
cruise assist is active.  
Control unit 1 for information electronics J794  
Sends the maneuver assist's display content to the upper MMI display  
Sends the information to control unit J1121 when the MMI display registers that a soft key has been pressed  
Control unit in dash panel insert J285  
Displays messages for the maneuver assist  
MMI display J685  
Displays the driver messages for the maneuver assist  
Displays the graphics for the parking aid/the image from the overhead view cameras in which maneuver assist information is  
also shown  
Registers when soft keys on the MMI display that affect the maneuver assist are pressed  
Driver and front passenger door control units J386 and J387  
Put the current status of the driver’s and front passenger’s doors (“door open/door closed”) on the convenience CAN bus  
Put the current status of the exterior mirrors (“left/right exterior mirror folded in/not folded in”) on the convenience CAN bus  
In both cases, the image from the affected overhead view camera must be excluded from the calculations.  
Data bus diagnostic interface J533  
Is the interface between the different vehicle bus systems  
Routes relevant information from one bus system to one or more other bus systems  
Reference  
For further information on the maneuver assist, please refer to SSP 667 “Audi - new park assist systems 2020” (refer  
to article “”).  
Park assist plus  
Introduction  
The park assist plus makes parking incredibly convenient. It guides the vehicle into parking spaces parallel or perpendicular to the  
road by taking over the steering, acceleration, braking and changes of transmission position.  
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The driver monitors the parking maneuver while sitting in the vehicle as he/she is still fully responsible for it. To allow the driver to  
monitor the vehicle’s surroundings better, the image from the overhead view cameras is shown on the MMI display throughout the  
maneuver. All vehicles with the park assist plus are also equipped with the optional overhead view cameras.  
The procedure for searching for suitable parking spaces is the same as for the third generation park assist that was introduced in  
2015 on the Audi Q7 (type 4M). It is carried out by measuring parking spaces with the front side ultrasonic sensors as the vehicle  
passes them. The geometrical requirements that a parking space must fulfil are also the same as for the third generation park as-  
sist.  
The system detects suitable parking spaces parallel or perpendicular to the road even if the driver has not yet activated the park  
assist plus display. Suitable parking spaces are always detected as long as the vehicle’s speed remains below 45 km/h. The system  
always searches on both sides of the vehicle.  
If the driver would like to use one of the parking spaces offered, he/she begins driving into it until prompted by the system to brake  
the vehicle to a standstill. If several parking spaces are offered, the driver can choose whether to use the parking space prioritised  
by the system or select a different identified parking space on the MMI. To start the parking maneuver with the park assist plus,  
the driver must take both hands off the steering wheel, press the brake pedal and then press the park assist plus button. The sys-  
tem starts the parking maneuver as soon as the driver releases the brake pedal. The driver must keep holding the button down  
during the entire parking maneuver. By continuing to hold the button down, the driver signals to the system that he/she is moni-  
toring the maneuver and that the system should continue with it.  
If the driver identifies a hazard during the parking maneuver, he/she can let go of the button to interrupt the maneuver at any  
time. If the interruption does not last too long, he/she can then continue with the parking maneuver by pressing the button again.  
If the interruption lasts for a longer period, the park assist plus ends the maneuver by applying the electromechanical park-ing  
brake, selecting transmission position P and then deactivating the drive system.  
Similarities and differences compared to the third generation park assist  
The park assist plus works in a similar way to the familiar third generation park assist. However, the driver receives considerably  
more assistance from the park assist plus compared to the third generation park assist. The system now takes complete control of  
the longitudinal movement of the vehicle and activates the overhead view camera display on the MMI. Nevertheless, the driver  
must still monitor the automatic parking maneuvers. This is important because he/she retains full responsibility for the entire  
parking maneuver.  
To enable a better understanding of the new parking system, the main similarities and differences between the park assist plus and  
the third generation park assist are described below. The comparison refers to the technical status of the two systems on vehicles  
based on the second generation of the MLBevo platform (model year 2021).  
Similarities between the park assist plus and the third generation park assist  
Park assist display activated on MMI by pressing button for steering assist  
Parking space search runs continuously on both sides of the vehicle whenever the vehicle is moving in the corresponding speed  
range  
Desired parking scenario selected on MMI  
The system takes over the steering for the different parking scenarios.  
The driver takes full responsibility for the parking maneuver. For this reason, the driver must monitor the vehicle’s surround-  
ings carefully and act accordingly in the event of any hazards.  
Both systems support the following parking scenarios:  
Reversing into a parking space parallel to the road  
Reversing into a parking space perpendicular to the road  
Driving forwards into a parking space perpendicular to the road after driving past it  
Driving forwards directly into a parking space perpendicular to the road  
Both systems support driving forwards out of a parking space parallel to the road  
Criteria for a suitable parking space parallel to the road:  
When parking: length of parking space parallel to the road ≥ vehicle length + 90 cm  
When driving out of a parking space (unparking): length of parking space parallel to the road ≥ vehicle length + 50 cm  
Criteria for a suitable parking space perpendicular to the road:  
When parking: width of parking space perpendicular to the road ≥ vehicle width + 95 cm  
Differences compared to the third generation park assist  
Park assist plus  
Third generation park assist  
Level 2 driver assist system  
Level 1 driver assist system  
System takes complete control of longitudinal movement of the vehicle. The driver is responsible for longitudinal movement of  
The driver only needs to hold a button down during the parking the vehicle.  
maneuver  
After the parking maneuver has been completed successfully, the sys-  
After the parking maneuver has been completed suc-  
tem engages the parking lock and the electromechanical parking brake. cessfully, the driver must select transmission position P  
and engage the parking brake himself/herself.  
221  
Park assist plus  
Third generation park assist  
The master control unit is driver assist systems control unit J1121 – ver- The master control unit is onboard supply control unit  
sion C.  
J519  
Uses 12 sixth generation ultrasonic sensors  
The system is linked to the optional overhead view cameras.  
Uses 12 fifth generation ultrasonic sensors  
The system works independently of the overhead view  
cameras.  
In addition to the measurement data from the 12 ultrasonic sensors, the The system only uses the measurement data from the  
system also uses data from the overhead view cameras via sensor data  
fusion.  
12 ultrasonic sensors.  
PR numbers: 7X5 and FT3/FT1  
PR numbers: 7X5 and FT0  
Parking scenarios for the park assist plus  
The park assist plus supports exactly the same parking scenarios as the third generation park assist. A schematic overview of all  
supported parking scenarios is provided in the diagram below.  
684_039  
Displays and operation  
The park assist plus searches for parking spaces on both sides of the road when the vehicle’s speed is below 45 km/h. The parking  
space search runs automatically in the background and does not have to be activated by the driver. To use the park assist plus, the  
driver must then activate the park assist plus display.  
There are two ways of activating the park assist plus display:  
1. Pressing the button for steering assist in the row of buttons on the centre console  
222  
684_049  
or  
2. Pressing the soft key for steering assist in the parking aid display on the MMI. In this case, the parking aid must already be ac-  
tive.  
684_230  
223  
Park assist plus button (E888)  
684_048  
The park assist plus button (button for automated driving E888) is the main control for the park assist plus. It is located above the  
selector lever and marked with “>>P”.  
Firstly, this button allows the driver to have a parking maneuver performed but also to interrupt it quickly if necessary. The driver  
must keep holding the button during the entire parking maneuver. Secondly, the LED integrated in the button indicates the cur-  
rent status of the function.  
The LED can indicate the following statuses:  
LED flashing in white  
LED lit up in green  
LED lit up in red  
The park assist plus is ready to start the parking maneuver or to resume after an interruption.  
The system is currently performing a parking maneuver.  
The park assist plus has aborted or completed the current parking maneuver.  
A parking maneuver may be aborted for the following reasons:  
The driver braked the vehicle to a standstill.  
The driver intervened in the steering.  
The driver pressed the accelerator.  
The system was switched off manually.  
The defined time limit was exceeded.  
The maximum permissible number of possible manoeuvring movements was reached.  
The current parking maneuver cannot be continued due to an obstacle.  
The ESC intervened.  
Note  
With the park assist plus, the driver remains fully responsible for the parking maneuvers, even though they are con-  
trolled by the system.  
Hardware and sensors  
Driver assist systems control unit J1121  
684_051  
224  
The master control unit for the park assist plus is driver assist systems control unit J1121. It was first introduced on the Audi A8  
(type 4N) launched in 2017. Control unit J1121 integrates several control units that were separate on other models into one cen-  
tral driver assist systems control unit. This enables the data from many sensors to be processed centrally in one control unit, elimi-  
nating the need for them to first be transmitted via bus systems, as well as the associated delay.  
Due to the large number of driver assist systems that can be ordered, several versions of driver assist systems control unit J1121  
were developed. The higher the number of driver assist systems fitted in a vehicle, the higher the version required. The basic ver-  
sion is called version A. As the number of driver assist systems in a vehicle increases, version B or C of the control unit becomes  
necessary.  
The park assist plus requires version C of control unit J1121.  
Central sensor technology for the park assist plus  
For the park assist plus to plan its parking maneuver in the best possible way, the system requires detailed information about the  
vehicle’s surroundings. The park assist plus receives this information from the following sensors:  
12 sixth generation ultrasonic sensors  
(G203, G204, G205, G206, G252, G253, G254, G255, G568, G569, G716, G717)  
4 overhead view cameras  
(R243 - R246)  
The image data from the overhead view cameras are analysed by image processing software in control unit J1121 which searches  
for objects in the images and fuses these data with the data from the ultrasonic sensors. Using and fusing data from two complete-  
ly different types of sensor increases the quality of the data used to calculate parking maneuvers.  
Reference  
For further information on driver assist systems control unit J1121, please refer to SSP 668 “Audi A8 (type 4N) (refer  
to chapter “Driver assistance systems control unit J1121”).  
225  
Networking of sensors with master control unit J1121  
684_040  
Key:  
E888  
Button for automated driving  
G203  
G204  
G205  
G206  
G252  
G253  
G254  
G255  
G568  
G569  
G716  
G717  
Rear left parking aid sender  
Rear centre left parking aid sender  
Rear centre right parking aid sender  
Rear right parking aid sender  
Front right parking aid sender  
Front centre right parking aid sender  
Front centre left parking aid sender  
Front left parking aid sender  
Front left sender for park assist steering on left side of vehicle  
Front right sender for park assist steering on right side of vehicle  
Rear left park assist steering sender  
Rear right park assist steering sender  
H22  
Front parking aid warning buzzer  
Selector lever sensors control unit  
J587  
R243  
R244  
R245  
R246  
Front overhead view camera  
Left overhead view camera  
Right overhead view camera  
Rear overhead view camera  
Convenience CAN  
226  

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