Vehicle Electrical System, General Repair Information
WARNING: This page does not describe the selected car, but rather 18 other vehicles, including the 2016 Audi S4, 2016 Audi A4 Quattro, 2016 Audi A4, 2015 Audi S4, and 2015 Audi A4 Quattro. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
When disconnecting and connecting battery, the procedure must be followed as described in the Repair Information.
WARNING:
Some tools are supplied with a tool safety clip, which is slid over the tool points after using the tool, in order to protect other workers from injuries and tool points from damage.
- Observe the current notes in the corresponding repair information for all repairs.
- Observe country-specific regulations.
- Before working on the electrical system, the battery Ground (GND) cable must be disconnected. By disconnecting the battery GND cable (current disruption), the electrical system is guaranteed to be safe to work on. Disconnecting the positive battery cable is only required when removing the battery.
- Before starting a repair, the cause of the damage must be eliminated first (for example sharp edges on chassis parts, faulty electrical consumers, corrosion etc.).
- Further information, for example, installing and removing the individual components, can be found in the appropriate Repair Information.
- Soldering is not permissible for repairs to the vehicle electrical system.
- Repair to the wiring harnesses and connectors on the vehicle electrical system may only be performed using the Wiring Harness Repair Set VAS1978B and with previous versions. Only use the yellow wires from the Wiring Harness Repair Set VAS1978B.
- Wiring harness repairs may not be performed again in the wrapping of the vehicle-specific wiring harness and are to be marked with yellow adhesive tape. This indicated a previous repair.
- Crimp connections must never be repaired. If necessary, lay a wire parallel to the faulty wire. After crimping, crimp connections must be heat-shrunk using hot air gun to prevent moisture penetration.
- Always observe the supplementary notes for repairing wiring harnesses on airbag- and seat belt tensioner systems, fiber optic cables, CAN bus lines, FlexRay wires, and antenna wires.
- A function test must be performed after every repair. If necessary, check Diagnostic Trouble Code (DTC) memory, erase and/or bring systems into basic setting.
- If possible, do not loosen grounding straps from the body (danger of corrosion).
- Not all wire cross-sections in the vehicle are contained in the Wiring Harness Repair Set VAS1978B and its previous versions. If the required wire cross-section is not present, the next greater cross-section must be used.
- Heat-resistant wires have been installed in the vehicle at various locations, mainly in the engine compartment. Heat-resistant wires can be recognized by their somewhat duller and softer insulation. Only heat-resistant wires may be used to repair these wires.