Audi Gamma CC Bose User manual

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
‒Remove right side A-pillar trim.
‒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.
If specified readings are obtained:
‒Remove radio.
‒Remove antenna cable from front antenna amplifier.
‒Set multimeter (Fluke 83 or equivalent) to measuring resistance ( Ω).
‒Connect multimeter between radio end and amplifier end of front antenna cable.
Checking front
antenna amplifier
power supply
●• Test conditions
‒Test steps
Specified
reading Repairing malfunction
‒Disconnect
power supply
(B+) wire 4
connector
●• Set multimeter
(Fluke 83 or equivalent)
to volt range
‒Connect multimeter
between power supply
connector and Ground
(GND)
‒Switch radio ON
 Approx.
12 V
‒Check wiring for open
circuit according to
wiring diagram, repair
as necessary
‒Set multimeter
to milliamp
range
‒Connect
multimeter
between two
halves of power
supply (B+) wire
4 connector
‒Switch radio ON
 Approx.
20 - 50
mA
‒Check wiring for open
circuit according to
wiring diagram, repair
as necessary or
‒Replace front antenna
amplifier
Page 1 of 2Electrical Equipment
4/1/2009vw-wi://rl/A.en-US.4A-EA-EA.wi::27980645.xml?xsl=2

●Center core: must be 0 ohms ( Ω) (continuity)
●Braided shield: must be 0 ohms ( Ω) (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.
Page 2 of 2Electrical Equipment
4/1/2009vw-wi://rl/A.en-US.4A-EA-EA.wi::27980645.xml?xsl=2