Audi A6 Typ 4G: Electrical/Electronic Components and Component Locations

1 - All Wheel Drive Control Module -J492-

• Installed location A4 Sedan, A5 Coupe and A5 Cabriolet. Refer to → Fig. " All Wheel Drive Control Module -J492- in the A4 Sedan, A5 Coupe and the A5 Cabriolet"
• Installed location A4 Avant. Refer to → Fig. " All Wheel Drive Control Module -J492- in the A4 Avant"
• Installed location A5 Sportback. Refer to → Fig. " All Wheel Drive Control Module -J492- in the A5 Sportback"
• Installed location A6 and A7. Refer to → Fig. " All Wheel Drive Control Module -J492- in the Audi A6/A7"
• Installed location A8. Refer to → Fig. " All Wheel Drive Control Module -J492- in the A8"
• Removing and installing. Refer to → Chapter "All Wheel Drive Control Module -J492-, Removing and Installing".
• Additional work after replacing the control module. Refer to → Chapter "All Wheel Drive Control Module -J492-, Additional Work after Replacing".
• Important signals from engine control module and ABS Control Module -J104- are transmitted via the Data bus to the All Wheel Drive Control Module -J492-.

2 - ABS Control Module -J104-

• Installation location, removing and installing.

3 - Diagnostic Connection

• Installed location: Driver side footwell. Refer to → Fig. "Data Link Connector"
• Connect the Vehicle Diagnostic Tester and select the function. Refer to → Chapter "All Wheel Drive Control Module -J492-, Removing and Installing".

4 - Hydraulic Control Unit

• Component location: on rear final drive
• Removing and installing. Refer to → Chapter "Hydraulic Control Unit, Removing and Installing".
• Disassembling and assembling. Refer to → Chapter "Hydraulic Control Unit, Disassembling and Assembling".
• Hydraulic control unit with:
  • All Wheel Drive Pump -V415-
  • Oil Pressure/Temperature Sensor 2 -G640-
  • Oil Pressure/Temperature Sensor -G437-
  • All Wheel Drive Clutch Valve 2 -N446-
  • All Wheel Drive Clutch Valve -N445-

5 - Display in Instrument Cluster

Data Link Connector

Component location: The data link connector for the Vehicle Diagnostic Tester is located in the driver side footwell.

All Wheel Drive Control Module -J492- in the A4 Sedan, A5 Coupe and the A5 Cabriolet

Component location: The All Wheel Drive Control Module -J492--A- is located in the spare wheel well in front of the battery.

All Wheel Drive Control Module -J492- in the A4 Avant

Component location: The All Wheel Drive Control Module -J492--1- is in the luggage compartment on the right in front of the spare wheel well.

All Wheel Drive Control Module -J492- in the A5 Sportback

Component location: the All Wheel Drive Control Module -J492--1- is located on the right wheel housing behind the luggage compartment side trim panel.

All Wheel Drive Control Module -J492- in the Audi A6/A7

Component location: The All Wheel Drive Control Module -J492--A- is located on the right in the spare wheel well.

All Wheel Drive Control Module -J492- in the A8

Component location: The All Wheel Drive Control Module -J492--A- is located on the left in the spare wheel well.

All Wheel Drive Control Module -J492-, Removing and Installing

  Note

• All Wheel Drive Control Module -J492- component location -item 1-.
• Removing and installing is on the A4 Sedan.
• The ignition is off.

- Remove the luggage compartment floor covering.

- Remove the covering and the vehicle tools mount.

- Remove the All Wheel Drive Control Module -J492--A- from the bracket -C-.

- Disconnect the connector -B- from the All Wheel Drive Control Module -J492-.

- Install the All Wheel Drive Control Module -J492- in reverse order of removal.

• If the All Wheel Drive Control Module -J492- was replaced then additional work is necessary. Refer to → Chapter "All Wheel Drive Control Module -J492-, Additional Work after Replacing".

All Wheel Drive Control Module -J492-, Additional Work after Replacing

  Note

Only perform the additional work only if the All Wheel Drive Control Module -J492- was replaced.

- Connect the Vehicle Diagnostic Tester and switch on the ignition.

- On the Vehicle Diagnostic Tester select the function 22 - Control Module, Replacing under Guided Functions in the directory 22 - AWD electronics.

• Follow the instructions given by the Vehicle Diagnostic Tester exactly.

"Adapt" the installed rear final drive to the All Wheel Drive Control Module -J492- with the Vehicle Diagnostic Tester.

  Note

A system check will take place when the 22 - Control Module, Replacing function is complete. If malfunctions appear, then use "Guided Fault Finding" to correct them.

Overview - Rear Final Drive

  Caution

Only some components on the rear final drive can be disassembled.

• Currently both chambers -item 11- and -item 25- cannot be removed from the final drive.
• It is therefore currently not possible to repair the interior components.

1 - Bolt

• 50 Nm + 180º turn
• Always replace.

2 - Right Flange Shaft

• Removing and installing. Refer to → Chapter "Flange Shaft Seals, Replacing, Rear Final Drive Removed".
• Do not confuse with the left flange shaft, they are different

3 - Protective Ring

• Replacing. Refer to → Chapter "Flange Shaft Protective Ring, Replacing".

4 - ATF Breather Pipe

• For the left chamber
• Clip onto the bleed pipe

5 - Gasket

• With strainer

6 - Hydraulic Control Unit

• With the All Wheel Drive Pump -V415- and lines to the chambers
• Removing and installing. Refer to → Chapter "Hydraulic Control Unit, Removing and Installing".
• Disassembling and assembling. Refer to → Chapter "Hydraulic Control Unit, Disassembling and Assembling".

7 - Bolt

• 20 Nm
• Quantity: 2
• M8; 50 mm long
• Follow the tightening sequence.

8 - Bolt

• 20 Nm
• M8; 50 mm long
• With a permanent seal under the bolt head
• Coat the threads with Sealing Compound -D 176 501 A1-.
• Follow the tightening sequence.

9 - Bolt

• 20 Nm
• M8; 30 mm long
• Follow the tightening sequence.

10 - Shaft Seal

• For the left flange shaft
• Replacing. Refer to → Chapter "Flange Shaft Seals, Replacing, Rear Final Drive Removed".

11 - Left Chamber

12 - ATF Check Plug

• 15 Nm
• Always replace.
• With permanent seal

13 - Left Flange Shaft

• Removing and installing. Refer to → Chapter "Flange Shaft Seals, Replacing, Rear Final Drive Removed".
• Do not confuse with the right flange shaft, they are different

14 - Protective Ring

• Replacing. Refer to → Chapter "Flange Shaft Protective Ring, Replacing".

15 - ATF Drain Plug

• 15 Nm
• Always replace.
• With permanent seal

16 - Gear Oil Drain Plug

• 15 Nm
• Always replace.
• With permanent seal

17 - Final Drive Housing

18 - Shaft Seal

• For the flange/driveshaft
• Replacing on rear final drive 0BF. Refer to → Chapter "Shaft Seal for Flange/Propshaft, Replacing".
• Replacing on rear final drive 0BE. Refer to → Chapter "Rear Final Drive 0BE - Replacing, Flange/Driveshaft Shaft Seal".

19 - Protective Ring

• Replacing. Refer to → Chapter "Flange/Driveshaft Seal, Replacing".

20 - Flange/Driveshaft

• Removing and installing on final drive 0BF. Refer to → Chapter "Shaft Seal for Flange/Propshaft, Replacing".
• Removing and installing on final drive 0BE. Refer to → Chapter "Rear Final Drive 0BE - Replacing, Flange/Driveshaft Shaft Seal".

21 - Circlip

• Always replace.
• Installing.

22 - Gear Oil Check Plug

• 15 Nm
• Always replace.
• With permanent seal

23 - Bracket

• For the wiring harness

24 - Bolt

• 9 Nm

25 - Right Chamber

26 - Shaft Seal

• For the right flange shaft
• Replacing. Refer to → Chapter "Flange Shaft Seals, Replacing, Rear Final Drive Removed".

27 - ATF Breather Pipe

• For the right chamber
• Clip onto the bleed pipe

28 - Final Drive Bleeder

• Clip onto the bleed pipe

READ NEXT: