Genuine Audi 100 Relay Boxes

Audi 100 Relay Boxes Parts and Q&A

• Relay Box
  4A0-941-803
  Q: Where are the Fuse Box and Relay Boxes located, and how can they be accessed and replaced on Audi 100?

  A:

  Fuses are found in the fusebox behind the end cover on the driver's side of the facia panel, with additional fuses, including automatic circuit breakers, located in the fuse/relay box in the rear corner of the engine compartment. More fuses can be accessed behind the front footwell side trim panels and the footwell floor plastic cover. To access the fusebox, open the driver's side door and unclip the end cover from the facia. For the engine compartment fuses, release the retaining clip and remove the cover from the fuse/relay box. Each fuse protects specific circuits, and to remove a fuse, switch off the relevant circuit or ignition, then pull the fuse out; a blown fuse will show a broken or melted wire. Always replace a fuse with one of the same rating, as indicated on the fuse, and avoid using a different rating or substituting anything else. If a new fuse blows immediately, investigate the cause, as faulty insulation may be the issue. Spare fuses of each relevant rating should be kept in the vehicle. Most relays are located in the fuse/relay box in the engine compartment or behind the driver's side facia storage compartment panel and footwell side trim panels. Access to the engine compartment relays is gained by removing the lid, while those behind the driver's side storage compartment require removing retaining screws and the panel. To access footwell trim panels, remove the trim strip and screws, with relay details available on a sticker on the rear of the panel. If a relay-controlled circuit develops a fault, listen for a click when the system is operated; if no click is heard, the relay may not be receiving power or could be faulty. Testing can be done by substituting with a known good relay, keeping in mind that while some relays may look identical, they can perform different functions. To replace a relay, ensure the ignition is off, pull out the old relay, and press in the new one.