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Anonymous Posted on May 06, 2011
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Poor radio reception.I've tried a new aerial mast,no improvement. CD player sounds fine. Any ideas? (Passat Est.2003)

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  • Posted on May 06, 2011
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Important! Please give copies to all your VW Technicians C 91--99--07 E 1999 Volkswagen of America, Inc. 1 Subject: Model(s): Group: Number: Date: AM Radio, Poor Reception 1999, 2000 91 99--07 New Golf, New Jetta, Aug. 2, 1999 New Beetle, Passat Condition AM reception is poor. May be caused by: ? An incorrect antenna mast installed for the antenna base equipped with the vehicle ? Poor ground at the antenna base or radio ? Poor battery ground to chassis or engine ? Poor antenna cable connection at Radio ? Corrosion at the antenna coaxial connectors at radio or antenna Service Vehicles are equipped with either a Bosch or a Clarion antenna base mounted on the roof and (for shipping purposes) the appropriate matching mast is located in the luggage compartment. If radio antenna masts are removed from vehicles and stored until vehicles are sold, there is a chance that an incorrect mast can be installed at the time of delivery. Note: Mismatched antenna mast and base will cause poor AM radio reception. The antenna base and mast can be identified visually as follows: (Cont. on Page 2)91-A260 requires gloss finish antenna mast 57mm 49mm Bosch 91-A261 requires matte finish antenna mast 61mm 41mm Clarion 91-A262 Technical Bulletin Important! Please give copies to all your VW Technicians C 91--99--07 E 1999 Volkswagen of America, Inc. 2 Bosch antenna ? Base (although oval) is more circular in shape (approx. 57mm x 49mm). ? Made in Germany stamped on underside of base. ? Two screws on underside of base are unpainted. ? Requires gloss finish antenna mast. Clarion antenna ? Base is more oval in shape than Bosch (approx. 61mm x 41mm). ? Two screws on underside of base are painted. ? Requires matte finish antenna mast. If antenna mast matches the antenna base correctly: -- Check antenna coaxial cable connections --arrows-- for corrosion and clean if necessary (DO NOT apply stabilant). Passat coaxial cable connection for radio is under the carpet on right side of tunnel near shifter. -- Ensure that coaxial cable is firmly seated in radio (Passat cable connection, see previous step). -- Check ground at the antenna below roof Nut --4-- (torque = 7+1 Nm) must firmly secure antenna to roof). (Cont. on Page 3)Technical Bulletin Important! Please give copies to all your VW Technicians C 91--99--07 E 1999 Volkswagen of America, Inc. 3 -- Check ground for radio behind radio on cross member (On Passat models as of Nov. 1998 beginning VIN: XE285000 ground for radio is on right side of center tunnel). -- Check engine compartment ground, left side, below battery tray; frombattery GND to body. -- Check engine/transmission ground on transmission, near engine block. -- If all grounds and antenna mast are OK. -- Replace antenna and coaxial cable assembly

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2002 Oldsmobile bravada x going through batteries AutoZone everybody says there's nothing wrong with it in the radio you can touch any electrical control throughout the car you can even touch the gear...
Good advice from Ray but I recommend you check the aerial ground at the lead end - this also checks the cable, check also for continuity between the mast and the aerial plug centre.

If a signal preamplifier is fitted, which is often the case when a short antenna or window antenna is fitted, the antenna lead will connect to the preamp and similar check will have to be performed on the screened lead from the preamp to the radio. Check also the supply and ground to the preamp if fitted.

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Measuring between the centre and the outer there should be an infinity reading on an ohmmeter, indicating no short circuits in the cable or aerial base. Measuring between the outer and a good ground the reading should be very low, no more than a few ohms indicating a good ground connection to the aerial base and of the aerial base to the bodywork.
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It is always worth checking the aerial in any case of poor reception.

In the case of a standard mast-type aerial it is necessary for the mast to have very good continuity to the centre of the aerial plug, that the outer part of the aerial plug has good continuity to the aerial ground and thus to the vehicle bodywork and the two parts are electrically isolated from each other. A good independent radio ground connection also helps.

In the case of miniature aerials or those within a windscreen, a rear screen or rear quarter glass, the amount of signal available will be small and so an aerial preamplifier will be provided to boost the signal. The preamp might be part of the aerial or a separate unit fitted anywhere convenient. I once found one fixed to the front firewall behind the dashboard.
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Best way to check an aerial cable, which is coaxial type, is to disconnect it from the radio and use an ohm meter to check the continuity.

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