Audi Q5: Vehicle Electrical System, General Repair Information
Caution
When disconnecting and connecting battery, the
procedure must be followed as described in the Repair
Manual.
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 manual
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.).
- For the wiring harnesses if possible a high quality
replacement part is always delivered. This means that previously
not required connector housings may be present on the
replacement part.
- Additionally bend back the non-necessary connector housing
when possible in a dry area of the vehicle and route them so
that no noises can result.
- Additionally to prevent capillary action seal the
non-necessary connector housing and single wires in wet areas of
the vehicle with water tight heat-shrinkable tube. The necessary
components to seal the single wires can be found in the Parts
Catalog.
- Further information, for example, installing and removing
the individual components, can be found in the appropriate
Repair Manual.
- Soldering is not permissible for repairs to the vehicle
electrical system.
- Wiring harness and connector repairs on the vehicle
electrical system may only be performed using Wiring Harness
Repair Set -VAS1978B- and previous versions such as the Wiring
Harness Repair Set -VAS631001- and the Wiring Harness Repair Set
-VAS631003-. Only use the yellow wires from the corresponding
wiring harness-repair kit.
- 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.
- Pinch and butt connectors must not 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. Connectors with
corresponding heat-shrinkable tube must be protected 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.
READ NEXT:
Wiring Harness Repair Set -VAS1978-
The Wiring Harness Repair Set -VAS1978- makes optimal repair
quality possible in the realm of vehicle electronics. Using the
tools, repairs affecting harness conn
Crimping Pliers with Insert
The Crimping Pliers without Insert -VAS1978/1- with Crimping
Pliers - Insert 2 -VAS1978/2- is a component of the Wiring
Harness Repair Set -VAS1978- and is used to crimp
Note
Observe general notes for repairs on the vehicle electrical
system. Refer to
→ Chapter "Vehicle Electrical System, General Repair
Information".
Airbag and Belt Tensioner Wires,
SEE MORE:
Overview - Electric Vacuum Pump
1 - Brake System Vacuum Pump -V192-
Can be checked in the "Guided Fault Finding" using the Vehicle
Diagnostic Tester
2 - Nut
9 Nm
3 - Check Valve
4 - Adjusting Buffer
5 - Vacuum Hose
6 - Sleeve
7 
Tread wear
Traction AA А В C
Temperature ABC
Quality grades can be found where applicable on the tire side wall between
tread shoulder and maximum section width > fig. 204.
For example: Tread wear 200, Traction AA, Temperature A.
All passenger car tires must conform to Federal Safety Req