Interference Noises Due To Power Supply - Porsche 996 TT Repair Manual

with a multimeter at the
negative terminal of the
battery.
Interference noise still present?
2
7. Cut the ground cable to the radio
approx. 30 cm from the device.
8. Make a ground connection directly
to the radio housing.
9. Connect the 30−cm−long end
of the ground cable to the
radio housing.
10. Connect the new ground connection
to a suitable point on the car body.
11. Check the ground connection
with a multimeter at the
negative terminal of the
battery.
Interference noise still present?

Interference noises due to power supply

Note
• Use this test routine for interference noises which originate from the vehicle electrics.
Work instruction
1
1. Temporarily disconnect the
connections to terminals 30, 15 and
ground on the radio.
2. Connect terminals 30, 15 and ground
temporarily via a separate lead.
3. Connect the other end of this lead
to the vehicle battery.
Interference noise still present?
Interference noise due to antenna
einordnung
=> Interference noises due to power supply
' End
Yes
The interference noise is triggered
via the radio
' Step 2
Replace
defective
components
' End
No
4. Reconnect the
original cable
connections to
the radio.
5. Temporarily
disconnect the
connections to
terminals 30,
15 and ground
on the
amplifier.
6. Connect
terminals 30,
15 and ground
temporarily
via a different
lead.
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