Porsche 996 TT, Repair Manual

Page: 1793 / 2099

13. Remove any audio cables which are
causing the problem from the wiring
harness.
Noise still present?
7
14. If the suspected component uses the
same ground connection as a
component of the audio system,
establish a problem−free ground
connection.
15. If ground connections are running via
the same wiring harness, separate
them from each other.
16. Wrap the terminal 30 and 15 lead of
the suspected component with a film
or a metal tape and connect the lead
to a ground connection.
17. Check the ground connection
with an ohmmeter at the
negative terminal of the battery.
Noise still present?
’ Step 8 ’ End
8
18. Find the positive cable of the
suspected component and cut the
cable at the component side.
19. Insert an interference filter between
the connecting cables.
’ End ’ End
Interference noises due to all looudspeakers
Note
The loudspeaker leads are twisted together as standard. •
Work instruction Yes No
1 Check all connections to the amplifier or the
radio. Take particular note of loose or bent pins,
corrosion or other damage.
Damage present? Repair the lead connection.
Noise still present? ’ Step 2.
Noise remedied? ’ End ’ Step 2
2
1. Localise the ground connection cable of the
amplifier.
2. Disconnect the ground connection cable on
the amplifier side.
3. Lay the ground connection cable separately
Disconnect all amplifiers but
one from the power supply
’ Step 3 ’ End
einordnung
Interference noises due to all looudspeakers 1730