Audi Gamma CC Bose Instructions Manual

Page 1
Page 1 of 2Electrical Equipment
Stereo radio 'Gamma CC Bose' with CD changer, component layout
Front antenna amplifier, checking
Test conditions
Battery OK
Power window circuit breaker -S43- (in auxiliary relay panel I) OK
5 amp fuse on radio OK
Use multimeter (Fluke 83 or equivalent) and connector test kit VW 1594 for all electrical tests
 Always use appropriate wiring diagram when troubleshooting
Leave front antenna amplifier mounted (Ground (GND) connection).
Note:
FM signals are received by both front and rear window antennas.
Refer to illustration 90-912 => page 91-29 for component callout references.
Checking front
antenna amplifier
power supply
Disconnect
power supply (B+) wire 4 connector
Set multimeter
to milliamp range
Connect
multimeter between two halves of power supply (B+) wire 4 connector
• Test conditions
Test steps
• Set multimeter (Fluke 83 or equivalent) to volt range
Connect multimeter
between power supply connector and Ground (GND)
Switch radio ON
Switch radio ON
Specified
reading
 Approx.
12 V
 Approx.
20 - 50 mA
Repairing malfunction
Check wiring for open
circuit according to wiring diagram, repair as necessary
Check wiring for open
circuit according to wiring diagram, repair as necessary or
Replace front antenna
amplifier
If specified readings are obtained:
Remove radio.
Remove antenna cable from front antenna amplifier.
Set multimeter (Fluke 83 or equivalent) to measuring resistance ( ).
Connect multimeter between radio end and amplifier end of front antenna cable.
Page 2
Page 2 of 2Electrical Equipment
Center core: must be 0 ohms ( ) (continuity)
Braided shield: must be 0 ohms ( ) (continuity)
If NOT:
Replace antenna cable.
Note:
Foreign substances such as paint, primer and windshield adhesive may conduct electricity and cause an unwanted connection between antenna and car body (GND) resulting in poor radio reception.
Carefully remove any paint, primer or windshield adhesive from antenna connection on windshield.
When installing windshield, ensure antenna connection remains clean.
Loading...