20 02 Checking Complaints About Car Radio System; Malfunctions In Radio System - Porsche 996 TT Repair Manual

91 20 02 Checking complaints about car radio system

Malfunctions in radio system

Reduced sound quality in one or more loudspeakers
Remedying problems with the amplifier
Interference noises
Electromagnetic compatibility (EMC) − Troubleshooting
Tools
top of page
Malfunctions in radio system
1. Check error and customer complaint.
2. Switch ignition off and remove ignition key.
3. Remove radio fuses (ignition and memory).
4. Wait approx. 3 minutes until all components are free of tension.
5. Insert fuses again.
6. Check error and customer complaint
again.
Work instruction
1 Check error and customer complaint
again.
Radio function OK?
2 Does radio have a display?
3 Does the system now function
perfectly?
4
7. Check all radio connections.
8. Check voltage at the connections
battery and ignition .
9. Check ground connection of
radio.
Radio function OK?
5
10. Disconnect audio connections
from radio.
11. At maximum volume setting,
measure the alternating voltage at
91 20 02 Checking complaints about car radio system
Yes
Check battery charging condition and
battery cables for perfect contacts.
If the problem persists, contact radio
manufacturer
' End
If an audio signal can be heard, connect
a functional radio
' Step 3
If no audio signal can be heard ' Step 5
Replace radio
' End
Repair wiring harness or plug
connection
' End
13. Check connection between the
radio and the amplifier with a
multimeter.
14.
No
Does radio have a
CD player or a
magnetic−tape
drive?
Yes ' Check
signal lead
No ' Go to Step 2
' Step 6
=> Interference
noises
' End
Connect
functional radio
' Step 3
Connect
functional radio
' Step 3
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