2012 Audi A8 (D4) Service & Repair Manual
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Adaptive Cruise Control, Calibrating
Before starting a calibration check if the vehicle is equipped with
an infrared system. If this is the case depending on the damage
claim the night vision system camera must be calibrated first.
Conditions
– The distance regulation control module must be calibrated
during the following conditions:
The Distance Regulation Control Module -J428-/Distance
Regulation Control Module 2 -J850- was be replaced.
The Distance Regulation Control Module -J428-/Distance
Regulation Control Module 2 -J850- was be removed and
installed.
The front bumper was damaged.
The front bumper was loosened, adjusted, or removed and
installed.
The rear axle toe was adjusted.
The adjustment angle is greater than –0.8° to +0.8°.
Too large of a vertical adjustment for the distance regulation
control module (leads to a blind spot deactivation). Functional
limitations emerge due to limited sensor sight, which is not the
result of a dirty sensor or inclement weather conditions (for
example, heavy rain-/snowfall, iced over sensor, etc.).
The DTC “no or incorrect basic setting/adaptation” is stored in
the DTC memory.
Additional procedures. Refer o → Suspension, Wheels,
Steering; Rep. Gr.44; Adaptive Cruise Control; Adaptive Cruise
Control, Calibrating.
Page 1 of 1 Adaptive Cruise Control, Calibrating
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Distance Regulation Control Module -J428-
/Distance Regulation Control Module 2 -J850-
Retaining Plate, Removing and Installing
Special tools and workshop equipment required
Digital Caliper -VAS6335-
Removing
– Remove the distance regulation control module. Refer o
→ Chapter „Distance Regulation Control Module -J428-
/Distance Regulation Control Module 2 -J850-, Removing and
Installing“.
– Turn the quick release -1-
counterclockwise.
– Remove the quick release from the stud
bolts.
– Remove the retaining plate -2- from the
distance regulation control module -3-.
Installing
Install in the reverse order of removal. Note
the following:
Note
Replace the quick release.
The stud bolts in the bracket are pre-set.
If necessary, correct the setting.
If the stud bolts were removed, then the
clips on the distance regulation control
module must be replaced. Refer o
→ Chapter „Distance Regulation Control
Module -J428-/Distance Regulation
Control Module 2 -J850- Clip, Replacing“.
– Place the control module on a soft and
clean surface.
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– Measure the dimension -a- at all stud bolts
using the Digital Caliper -VAS6335- and
correct if necessary.
Dimension -a- = 43.3 mm.
– Position the retaining plate -3- onto the
distance regulation control module -1-.
– Carefully press the new quick release -4-
onto the stud bolt -2-.
– Turn the quick release clockwise onto the
retaining plate to the stop -arrow-.
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Distance Regulation Control Module -J428-
/Distance Regulation Control Module 2 -J850-,
Removing and Installing
Note
If replacing the control module, select the “Replace Control
Module” function using the Vehicle Diagnostic Tester.
Removing
– Remove the air intake grille. Refer o → Body Exterior; Rep.
Gr.63; Front Bumper; Attachment, Removing and Installing.
– Unclip the cover.
– Remove the bolts -1 to 4-.
– Remove the distance regulation control
module -A- from the bumper cover.
Note
Clean and dry the area around the control
module connector.
– Disconnect the connector -arrow-.
Installing
Install in the reverse order of removal. Note
the following:
Note
Check the connector for damage, contact
corrosion and water ingress, and service if
necessary. Refer o → Electrical Equipment
General Information; Rep. Gr.97; Wring
Harness and Connector Repair.
– Calibrate the adaptive cruise control.
Refer o → Chapter „Adaptive Cruise
Control, Calibrating“.
Tightening Specifications
Refer to → Chapter „Overview - Adaptive
Cruise Control Component Location“.
Page 1 of 1 Distance Regulation Control Module J428/Distance Regulation Control Module 2 J850, R...
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Distance Regulation Control Module -J428-
/Distance Regulation Control Module 2 -J850- Clip,
Replacing
Note
If the stud bolts were removed, then the clips on the distance
regulation control module must be replaced.
The clips cannot be removed without being damaged.
Procedure
– Remove the distance regulation control module retaining
plate. Refer o → Chapter „Distance Regulation Control
Module -J428-/Distance Regulation Control Module 2 -J850-
Retaining Plate, Removing and Installing“.
– Remove the stud bolt -1- using a suitable
tool -2-.
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– Place a screwdriver between the hook
and the housing.
– Bend every hook all the way around with
the screwdriver until it audibly breaks off.
– To prevent the broken hook from getting
caught on the housing, remove it from the
inside of the clip using needle nose pliers.
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– Insert the new clip into the hole in the
housing from the left and then press on it
by hand until it clicks into place.
The tabs on the clip must sit correctly in
the recesses.
– Install the stud bolt.
The stud bolt must be parallel inside the
hole and correctly aligned to the clip.
– Turn the stud bolt into the distance
regulation control module up to the
dimension -a-.
Dimension -a- = 43.3 mm.
– Repeat this procedure on all the other clips,
if necessary.
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Overview - Adaptive Cruise Control Component Location
1 - Nut
2 - Stud Bolt
Note the
adjustment
dimension.
Refer o
→ Anchor
3 - Clip
Must always
be replaced
if the stud
bolt -2- was
removed.
Replacing.
Refer o
→ Chapter
„Distance
Regulation
Control
Module -
J428-
/Distance
Regulation
Control
Module 2 -
J850- Clip,
Replacing“
4 - Connector
Check for damage, contact corrosion and water ingress, and service if necessary. Refer o
→ Electrical Equipment General Information; Rep. Gr.97; Wring Harness and Connector Repair.
5 - Cover
6 - Distance Regulation Control Module
Right: Distance Regulation Control Module -J428-
Left: Distance Regulation Control Module 2 -J850-
Removing and installing. Refer o → Chapter „Distance Regulation Control Module -J428-/Distance
Regulation Control Module 2 -J850-, Removing and Installing“.
7 - Bracket
8 - Bolt
Page 1 of 2 Overview - Adaptive Cruise Control Component Location
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2.5 Nm
Quantity: 4
Page 2 of 2 Overview - Adaptive Cruise Control Component Location
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Jump Start Point, Removing and Installing
Removing
– Turn off the ignition and disconnect the ground cable from the
battery; vehicles without high voltage system. Refer o
→ Chapter „Battery, Disconnecting and Connecting, Vehicles
without High Voltage System“, vehicles with high voltage
system. Refer o → Chapter „Battery -A- and Auxiliary Battery -
A1-, Disconnecting and Connecting“.
– Remove the windshield wiper arms. Refer o → Chapter
„Windshield Wiper Arms, Removing and Installing“.
– Remove the seal -1- near the plenum
chamber cover.
Caution
Danger of damaging the plenum
chamber cover.
Coat the space between the windshield
and the plenum chamber cover with
some soapy water.
– Carefully remove the plenum chamber
cover -2- starting at the edge of the glass
vertically from the windshield -arrows B-.
– Disengage the plenum chamber cover on
the outside of the cover -3-. To do this, lift
the cover in the center and disengage it
from the guides -4-.
Page 1 of 5 Jump Start Point, Removing and Installing
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What's Included?
Lifetime Access
Fast Download Speeds
Offline Viewing
Access Contents & Bookmarks
Full Search Facility
Print one or all pages of your manual
$39.99
Fixing problems in your 2012 Audi A8 (D4) is a do-it-yourself approach with the 2012 Audi A8 (D4) Service & Repair Manual. This manual contains comprehensive instructions and procedures on how to repair and maintain this specific model, making it an essential guide for both professional mechanics and DIY enthusiasts. The durability of your Audi A8 is unquestionable, but even the toughest vehicles experience wear and tear over time. When components begin to deteriorate, the manual will guide you through the process of replacing or repairing them. With clear illustrations, technical diagrams, and a complete list of car parts, even the most novice mechanic can confidently tackle repairs and maintenance tasks.
The information contained in this repair manual is the very same used by the engineers at Audi. The manual covers all these sections and contains hundreds of detailed photos and more:
- Maintenance
- Engine
- Control System
- Mechanical
- Fuel Service Specifications
- Emission Control
- Intake Exhaust Cooling
- Lube
- Ignition Starting Charging
- Auto Transmission Clutch
- Manual Transmission
- Transfer Propeller Shaft
- Drive Shaft
- Differential
- Axle Suspension
- Tire & Wheel
- Brake Control
- Brake
- Parking Brake
- Steering Column
- Power Steering
- Air Condition
- Suppression Restraint System
- Seat Belt
- Engine Immobilizer
- Cruise Control
- Wiper & Washer
- Door Lock
- Meter Audio/Visual
- Horn
- Windshield/Glass Mirror
- Instrument Panel
- Seat
- Engine Hood/Door
- Exterior & Interior
- Electrical
- Multiplex/Can Communication
- And much more...
Additional information about this service repair manual:
- Compatible: All Versions of Windows and Mac
- Printable: Yes
- Language: English
- Requirements: Adobe Reader and Windows (free and available online)
The 2012 Audi A8 (D4) Service & Repair Manual is designed to save you time and expense. Complete with all the essential technical data and step-by-step guides, you will enjoy learning how to repair and maintain your Audi A8 without always having to rely on a mechanic. You can print off the pages you need and refer to them directly in your garage or workshop, keeping your manual safe on your PC and easily accessible at all times.
