I finalized the installation of the ACC system in my Q7, and i am happy to report that everything is working perfectly.
The following parts are required:
4L0 910 561 A - radar sensor with incorporated control unit
4L0 907 574 - holder for radar sensor
4F0 972 708 - connector housing for radar unit
4E0 953 521 C - switch for cruise control with ACC
7M3 927 810 - distance sensor for diafragm position
3D0 973 703 - connector housing for distance sensor
I had to replace the gateway interface with 4L0 907 468 C. This one is compatible with E-CAN controllers like ACC.
Component Protection has to be removed from ACC Controller and Gateway after installation.
Coding:
Engine LOGIN-II (do not use this codes until ACC sensor is in place, CP removed, and no errors in gateway)
16167 - Deactivate Cruise Control System
13647 - ACC Activation
ABS Control Unit
0562321 - Activation of ACC functions this is valid for 3.0 TDI engines
Instrument Cluster
????xxxx
???? add 128 to whatever coding you have here
MMI
Use DIAG MENU (SETUP+CAR) go to Config, APKx01 and check mark the ACC option, scroll down to ACCEPT CHANGES, exit this menu and restart MMI.
Steering Wheel
Sixth Digit from left put 5 (On Board Computer with ACC), usually here is 4(On Board Computer with CCS)
Connector on ACC Controller has the following pins connected:
Pin 8 - Terminal 15 (12v) ignition
Pin 7 - Heater Output
Pin 2 - ECan High - Gateway Pin 13
Pin 3 - ECan Low - Gateway Pin 26
Pin 1 - GND
I dont have the heater in the licence plate holder so to avoid the error go to Adaptation Ch.03 and save "0" as the new value. This means "Heater OFF". Value "1" means Heater ON.
My ACC sensor required calibration. The error "Sensor Misaligned" was permanent and could not be erased. I had to go to Audi Service to calibrate the sensor in order to remove that error.
Now, the tricky part.
ACC in Q7 requires a different brake servo that has an extra sensor for diafragm position. It is a mechanical sensor that sends a variable resistor value to the ABS control unit in order to determine the position of the diafragm inside the servo and therefor the brake pressure the driver puts on the brake pedal.
This information is not used by the ABS for ACC operation, it is only for HILL HOLD ASSIST, a function that helps the driver to keep a constant speed when driving down a hill. Not having this sensor in place will trigger an error in the ABS unit which will cause ACC to turn OFF. Any error in the ABS controller will make the ACC unusable, i think this is a safety issue.
The sensor is about 60 euros including the connector. It has 3 pins that goes directly in the ABS controller as follows:
Pin 1 -> ABS Pin 26
Pin 2 -> ABS Pin 27
Pin 3 -> ABS Pin 38
Having the sensor connected to the ABS servo requires the replacement of the ABS servo with the ACC model part no. 7L8 612 105 F.
I found a way around this as the ABS servo costs around 450 euros + installation.
I connected the sensor at the ABS control unit and locked it in the OPEN position as if the brake pedal is not pressed. Open position means the actuator of the sensor is pressed inside 2 milimeters.
This is enough to trick the ABS control unit that the sensor is there, and the brake pedal is not pressed.
To connect the sensor to the ABS controller you have to remove the ECU. Access to the ABS connector is pretty hard, but with patience the pins can be inserted in the connector.
The ACC works perfectly even to a full stop, i tested it for few hours driving in the city and about 30 km on a motorway.
I did not tested the cars behavior driving it down hill. I assume i have to keep the foot on the brake pedal as it will not brake itself due to the sensor not being installed in its proper position. I will test it tomorrow and let you know.
I did not replaced the instrument cluster as the original one has all the functions except the leds in the speedometer. This is replaced by a digital display of the speed in the FIS when you set the ACC. The set speed is displayed for 2-3 seconds than the distance indicator comes in the same place.
ACC in Q7 comes with an extra function called "Audi Braking Guard" which is also fully functional. This feature will issue an warning when you drive to close to the car in front at high speed. The system can calculate if at the actual speed of the car you can brake safely in the distance to the car in front of you, if that car brakes suddenly. The warning is visible in the FIS as a RED car and the flashing red color word "DISTANCE", together with a warning chime.
I will make some pictures tomorrow to demonstrate.
All together i am happy with the result and i consider the retrofit as DONE.
Maybe in the future i will replace also the brake servo with the right one if i will find a bargain.
The following parts are required:
4L0 910 561 A - radar sensor with incorporated control unit
4L0 907 574 - holder for radar sensor
4F0 972 708 - connector housing for radar unit
4E0 953 521 C - switch for cruise control with ACC
7M3 927 810 - distance sensor for diafragm position
3D0 973 703 - connector housing for distance sensor
I had to replace the gateway interface with 4L0 907 468 C. This one is compatible with E-CAN controllers like ACC.
Component Protection has to be removed from ACC Controller and Gateway after installation.
Coding:
Engine LOGIN-II (do not use this codes until ACC sensor is in place, CP removed, and no errors in gateway)
16167 - Deactivate Cruise Control System
13647 - ACC Activation
ABS Control Unit
0562321 - Activation of ACC functions this is valid for 3.0 TDI engines
Instrument Cluster
????xxxx
???? add 128 to whatever coding you have here
MMI
Use DIAG MENU (SETUP+CAR) go to Config, APKx01 and check mark the ACC option, scroll down to ACCEPT CHANGES, exit this menu and restart MMI.
Steering Wheel
Sixth Digit from left put 5 (On Board Computer with ACC), usually here is 4(On Board Computer with CCS)
Connector on ACC Controller has the following pins connected:
Pin 8 - Terminal 15 (12v) ignition
Pin 7 - Heater Output
Pin 2 - ECan High - Gateway Pin 13
Pin 3 - ECan Low - Gateway Pin 26
Pin 1 - GND
I dont have the heater in the licence plate holder so to avoid the error go to Adaptation Ch.03 and save "0" as the new value. This means "Heater OFF". Value "1" means Heater ON.
My ACC sensor required calibration. The error "Sensor Misaligned" was permanent and could not be erased. I had to go to Audi Service to calibrate the sensor in order to remove that error.
Now, the tricky part.
ACC in Q7 requires a different brake servo that has an extra sensor for diafragm position. It is a mechanical sensor that sends a variable resistor value to the ABS control unit in order to determine the position of the diafragm inside the servo and therefor the brake pressure the driver puts on the brake pedal.
This information is not used by the ABS for ACC operation, it is only for HILL HOLD ASSIST, a function that helps the driver to keep a constant speed when driving down a hill. Not having this sensor in place will trigger an error in the ABS unit which will cause ACC to turn OFF. Any error in the ABS controller will make the ACC unusable, i think this is a safety issue.
The sensor is about 60 euros including the connector. It has 3 pins that goes directly in the ABS controller as follows:
Pin 1 -> ABS Pin 26
Pin 2 -> ABS Pin 27
Pin 3 -> ABS Pin 38
Having the sensor connected to the ABS servo requires the replacement of the ABS servo with the ACC model part no. 7L8 612 105 F.
I found a way around this as the ABS servo costs around 450 euros + installation.
I connected the sensor at the ABS control unit and locked it in the OPEN position as if the brake pedal is not pressed. Open position means the actuator of the sensor is pressed inside 2 milimeters.
This is enough to trick the ABS control unit that the sensor is there, and the brake pedal is not pressed.
To connect the sensor to the ABS controller you have to remove the ECU. Access to the ABS connector is pretty hard, but with patience the pins can be inserted in the connector.
The ACC works perfectly even to a full stop, i tested it for few hours driving in the city and about 30 km on a motorway.
I did not tested the cars behavior driving it down hill. I assume i have to keep the foot on the brake pedal as it will not brake itself due to the sensor not being installed in its proper position. I will test it tomorrow and let you know.
I did not replaced the instrument cluster as the original one has all the functions except the leds in the speedometer. This is replaced by a digital display of the speed in the FIS when you set the ACC. The set speed is displayed for 2-3 seconds than the distance indicator comes in the same place.
ACC in Q7 comes with an extra function called "Audi Braking Guard" which is also fully functional. This feature will issue an warning when you drive to close to the car in front at high speed. The system can calculate if at the actual speed of the car you can brake safely in the distance to the car in front of you, if that car brakes suddenly. The warning is visible in the FIS as a RED car and the flashing red color word "DISTANCE", together with a warning chime.
I will make some pictures tomorrow to demonstrate.
All together i am happy with the result and i consider the retrofit as DONE.
Maybe in the future i will replace also the brake servo with the right one if i will find a bargain.
(
