Audi A4 Owners & Service Manuals

Audi A4: Seat Belt Latch, Function Test

Seat Belt Latch, Checking

- Insert the belt tongue into the seat belt latch until it clicks into place. Check whether the locking mechanism is properly engaged by giving the seat belt webbing a firm jerk.

  • Replace the entire seat belt with the seat belt latch if the belt tongue fails even once to engage properly in the seat belt latch during at least five tests.

Release, Checking

- Press the seat belt latch with finger pressure to release the seat belt. With the seat belt webbing relaxed, the belt tongue must spring out of the seat belt latch without assistance.

  • Perform the test at least five times. Replace the entire seat belt with the seat belt latch if the belt tongue fails to spring out even once.


Under no circumstances may lubricant be used to eliminate noise or stiffness at the seat belt latch buttons.

Seat Belt Relays and Belt Tongue, Checking

The plastic-covered guides show fine parallel grooves after straining of the belt system (belt was fastened during accident). (Wear from frequent belt use can be identified by smooth signs of wear that are free of scoring.)

- Check plastic for deformation, rupture and the formation of cracks.

  • For groove build-up and/or damage, replace the entire seat belt with the seat belt latch.

Fasteners and Mounting Points, Checking After a Collision

  • Seat belt latch tongue deformed (fully extended).
  • Height adjustment not functional.
  • Mounting points (seat, pillar, vehicle floor) distorted or threads damaged.
  • If damage is found on the components, replace the entire seat belt with the seat belt latch.
  • If parts of the seat belt system are removed due to an accident, replace the belt system bolts.
  • Replace the mounting points.


If damage is discovered that did not result from an accident, For example wear, replace only the particular part which is damaged.

Seat Belt for Child Seat, Checking Child Seat Restraint Function, Market-Specific, Not for Driver Seat Belt

To check the function, the entire belt system must be installed, including the side trim panel.

Hold Function, Switching On

  • Pull out the seat belt all the way.

Proper Function

  • The belt must retract with a chattering sound.
  • If the retracting process is stopped, the belt cannot be pulled out anymore.

Switching Off

  • Belt retraction to about 100 mm (3.93 in.) remaining.
  • Hold function must switch off with a remainder of 100 mm (3.93 in.), at the latest. The belt functions normally again.

If the seat belt for the child seat restraint function does not work, replace the seat belt

Child Seat Anchors, Checking After Collision

Inspection Points

  • Child seat anchors must be checked for damage or deformation after a collision.
  • Child seat anchors welded or bolted into the body or the seat or backrest must not be repaired or straightened.
  • Child seat anchors bolted into the body, seat or backrest must be replaced if damaged or deformed.
  • The bolts used to secure the child seat anchors must be replaced if the bracket is damaged.

Safety Precautions, Automatic Dimming Interior Rearview Mirror


Health risk due to electrolyte.

  • To produce its unique properties, the interior rearview mirror glass is composed of several layers and contains an electrolyte. Be careful of electrolyte fluid leaking from a broken mirror.
  • The electrolyte fluid can cause irritation to the skin, eyes and respiratory system.
  • If electrolyte fluid comes into contact with the eyes or skin, flush thoroughly with plenty of water. If irritation persists, seek medical attention immediately.


Electrolyte fluid leaking from a broken mirror will damage all plastic surfaces it comes in contact with. Remove spilled electrolyte immediately using clean water and a sponge.

Repair Information

Contact Corrosion

Contact corrosion can occur if incorrect fasteners (bolts, nuts, washers, etc.) are used.

For this reason, only fasteners with a special surface coating are installed.

Rubber or plastic parts and adhesives are also made of non-conductive materials.

If there are any doubts as to whether parts can be reused or not, use new parts. Refer to the Parts Catalog.


  • The use of original replacement parts is recommended, since they are tested and are compatible with aluminum.
  • The use of Audi accessories is recommended.
  • Contact corrosion damage is not covered under warranty!

Line Routing and Securing

When loosening or removing and installing hydraulic, pneumatic lines or wires, draw sketches or take pictures. This ensures installation is the same as the original.


     Interior Equipment

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     Battery Charger -VAS5095A-

      WARNING Risk of injury. Follow all warning messages and safety precautions. Refer to → Chapter "Warnings and Safety Precautions". In order to prevent damage to the Battery -A- or vehicle, observe the battery type information. Refer to → Chapter "Battery Types".   WAR

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