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00858 - Connection: Radio ZF Output to Antenna Amplifier

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Old 09-22-2003, 04:08 PM
  #1  
rotto
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Default 00858 - Connection: Radio ZF Output to Antenna Amplifier

I found this fault code waiting for me today (full text included at end). Does any one have more insight into what this condition from the Radio is? I have cleared the code and am waiting to see if it comes back.


Address 56 -------------------------------------------------------
Controller: 8E0 035 195 A
Component: symphony II NP2 0050
Coding: 00201
Shop #: WSC 00000
1 Faults Found:
00858 - Connection: Radio ZF Output to Antenna Amplifier
44-10 - Short Circuit - Intermittent
Old 09-22-2003, 05:29 PM
  #2  
rotto
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Default HF and ZF

OK. So in radio terms (English to German):
Radio frequency (RF) = Hochfrequenz (HF)
IF Alignment = ZF Abgleich

I then looked in my Bentley manual and see that there is a "Control unit for antenna selection, Underneath the roof frame trim" on my car and in the diagram it has HF and ZF marked on it. I can't be certain but I am guessing the ZF is NOT a signal return cable but a power output cable for the controller. The Bentley manual mentions "...the original Audi radio units have a remotely driven antenna (the voltage supply of the antenna amplifier is driven via a center wire of the high frequency cable)."

So does this error mean that the power supply cable to the antenna control has shorted? Or is this something else?
Old 10-01-2003, 05:40 AM
  #3  
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Default Do you have an RF device?

I got this code After i install XM Radio RF module. But after i installed an amplified one it went away but i still have another code for the radio.

Manity
2002 2.7T
Old 10-02-2003, 01:20 PM
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rotto
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Default Nope, no XM, no mods... got this info...

...from the Bentley forum:
Check the antenna at the top of the rear window they are having an issue with board cracking at the hf/zf connections.

Looks like it will be time for yet another dealer visit... grumble grumble.
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