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High-voltage system - General information - Edition 02.2021
2
Repair instructions
⇒ c2.1 orrosion”, page 3
⇒ a2.2 nd attachment of lines”, page 3
⇒ f2.3 or cleanliness when working on high-voltage system”,
page 3
2.1
Contact corrosion
Contact corrosion can occur if non-approved fasteners are used
on the vehicle (bolts, nuts, washers etc.).
For this reason, only connecting elements with a special surface
coating have been fitted.
Furthermore, rubber and plastic components as well as adhe‐
sives are made of non-conductive materials.
If there is any doubt about the suitability of parts, a general rule
is to use new parts ⇒ Electronic parts catalogue (ETKA).
Please note
♦ Only use genuine replacement parts which are tested and
compatible with aluminium.
♦ Only use Volkswagen Genuine Accessories.
♦ Damage resulting from contact corrosion is not covered by
the warranty.
2.2
Routing and attachment of lines
♦ Mark lines prior to removal to prevent them from being inter‐
changed and to ensure that they are fitted in their original
positions. This applies for fuel, hydraulic and vacuum lines
as well as lines for activated charcoal filter system and elec‐
trical wiring. Make sketches or take photographs if necessa‐
ry.
♦ To avoid damaging pipes and wires, ensure adequate clear‐
ance from all moving or hot components in the engine com‐
partment on account of the confined space.
2.3
Rules for cleanliness when working on
high-voltage system
When working on the high-voltage system, pay careful attention
to the following rules for cleanliness:
♦ Thoroughly clean all connections/inspection holes and cor‐
responding surrounding areas before disconnecting/opening
them.
♦ Place removed parts onto a clean surface and cover. Use
lint-free cloths only.
♦ Carefully cover opened components or seal them if repairs
cannot be carried out immediately.
♦ Install only clean components.
♦ Remove packing from replacement parts immediately prior
to installation and not before.
♦ Do not use parts that have been kept unpackaged (for ex‐
ample in toolboxes).
♦ Transportation and protective packaging and sealing caps
must be removed only immediately before fitting.
2. Repair instructions
3
English 
