Service Procedure
For concerns of poor radio reception:- Use the following as a guide for trouble shooting.
Tip:
This Technical Bulletin is divided into four sections:
^ Section 1: Includes antenna systems by vehicle.
^ Section 2: Includes radio antenna system diagnosis procedures for AM/FM concerns using internal radio diagnostics.
^ Section 3: Includes antenna lead diagnosis.
^ Section 4: Antenna cables
Tip:
^ Perceived reception issues may be a result of environmental factors.
^ Reception may be diminished in certain areas due to power wires, buildings and/or overpasses.
^ Aftermarket window tint may interfere with reception.
^ In cases that are questionable, locate identical vehicle and verify concern (if the like vehicle is same, condition may be normal).
Section 1 - Antenna systems by vehicle
Tip:
For more detail see Repair Manual Group 91- Communication of the vehicle you are working on.
Passat (W8 only)
- Antenna Selection Control Module -J515- (Diversity box) -3-:
^ Location Wagon; behind left luggage compartment side trim, below rear side window.
^ Location, Sedan: under rear parcel shelf.
Antennas:
All models use four antennas -1-, -8-.
^ Location Wagon: Integrated with rear side windows.
^ Location Sedan: Integrated with rear window.
Antenna amplifiers:
All models use four antenna amplifiers -2-.
^ Location,Wagon: 2 each behind left and right luggage compartment side trim, below rear side windows.
^ Location Sedan: 2 under rear parcel shelf and 1 each behind left and right rear D-pillar trim.
Touareg
- Antenna Selection Control Module -J515- (Diversity box)
All models use an Antenna Selection Control Module -J515- item -8-.
^ Location: Behind rear section of molded headlining.
Antennas
All models use four antennas items -2-, 4- (qty. 2) & -7-.
^ Antennas (R130, R131) are integrated into rear hatch glass.
^ Antenna R11 in left rear side glass.
^ Antenna R93 in right rear side glass.
Antenna amplifiers
All models use four antenna amplifiers items -1-, -3-, -5- & -6-.
^ Item 1 - Antenna Amplifier 1 -R24- (for AM and FM reception). Above left side window.
^ Item 3 - Antenna Amplifier 2 -R111- (for FM reception). In upper section of rear lid.
^ Item 5 - Antenna Amplifier 3 -R112- (for FM reception). In upper section of rear lid.
^ Item 6 - Antenna Amplifier 4 -R113- (for FM reception). Above right side window.
Phaeton
- Antenna Selection Control Module -J515- (Diversity box)
All models use an Antenna Selection Control Module -J515- item -4-.
^ Location: Above rear glass under headliner.
Antennas
All models use four antennas.
^ Antennas -2-, -7- and -8- (for FM reception). Integrated into rear glass -5-
^ Antenna -3- (for AM and FM reception). Integrated into rear glass -5-.
- Jetta / Golf / Passat (non W8) - Antenna system
^ All models use External amplified antenna mast -1-.
Section 2 - Radio antenna system diagnosis through radio unit
Premium VI radios are capable of signal diagnosis through operating internal diagnostics of the radio unit.
All models except Touareg and Phaeton:
- Select AM or FM.
- Press and hold the mix button (black arrow).
- Screen will appear that shows "Service Test mode" (white arrow).
- Press mix button briefly.
^ Test one indicates current antenna status, i.e. ON or OFF (arrow).
- Press mix button briefly again.
- Screen displays strength of signal (LEVEL) in bar graph form (can be used for AM and FM).
- Press mix button briefly again.
^ Screen indicates number of stations broadcasting close to frequency band of selected station.
^ As the number increases for [mp] and (adj], static and signal crossing will increase.
To exit service mode:
- Depress and hold the mix button or switch radio OFF then back ON
Navigation units
^ No internal diagnosis functions. Continue to antenna lead diagnosis.
Section 3 - Antenna Lead Diagnosis
After initial radio diagnosis using internal service functions, use the following procedures:
- Locate antenna lead/s from radio at system end-point, i.e. diversity box or antenna mast base.
- Check for proper connection. (follow steps for your type of system).
- For all systems, locate cable end-point at either diversity box or antenna mast base.
- Disconnect cable from either diversity box or antenna mast base.
- Carefully ground center wire in cable to chassis.
If reception returns:
^ Cable and radio are ok.
If reception does not return:
^ Problem is located further forward in the system.
For problems forward of the antenna system:
- Continue with Section 3a.
For problems at antenna system:
Skip to Section 3b.
For problems at antenna systems:
Tip:
All checks should be done outdoors away from buildings.
Section 3a - Problems forward of antenna system
- First verify connection at Radio (check for bent or crushed connections and proper fit).
If all connections appear ok:
- Ground antenna lead at radio or attach external antenna mast to radio unit (check for reception).
If reception returns:
^ Problem is located between radio and antenna.
- Check connections near center console:
If connections are OK:
- Check resistance of cable from end to end.
^ If More than .4 ohms:
- Replace cable.
If reception does not return;
- Replace radio unit.
Section 3b - Problems at antenna system, Diversity Antenna (Touareg, Passat W8)
If concern is only AM poor / no reception;
Locate AM antenna amplifier.
^ Touareg: located above left side window.
^ Passat W8: Sedan above rear window.
^ Passat Wagon: located on left rear window.
- Check for proper connections at amplifier both from diversity box and to glass.
If connection issue is at glass or on glass:
- Glass must be replaced.
If connection problem to amplifier:
- Repair connection (replace cable or amplifier).
If no apparent connection problems:
- Replace amplifier.
If concern is poor FM reception:
- Disconnect all amplifiers, tune radio to high-powered station for your area.
- Connect amplifiers one at a time.
If reception is indicated:
- Disconnect that amplifier and move on to next amplifier.
If at any point in reconnecting amplifiers there is a loss in reception and there are no connection issues:
- Replace that amplifier and check again.
If there is no reception change when disconnecting and reconnecting all amplifiers:
- Replace diversity/antenna selection box.
Jetta / Golf / Passat (non W8) - Antenna system (Amplified Antenna Mast)
- Check connections at antenna base.
- Check for corrosion at mounting.
If corrosion is found:
- Clean mount and apply anti-seize gel to mounting.
If concern is no AM and/or little or poor AM/FM reception,
- Replace antenna base.
Section 4- Antenna cables
If antenna cables are required:
- Antenna cables - single DIN (Premium V) radio.
- Antenna cables - double DIN (Premium VI) radio.
- Antenna cables - Phaeton 2004 > 2006
- Antenna cables - Satellite radio (Hard top vehicles)
- Antenna cables - New Beetle with Satellite radio (convertible)
- Antenna cables - W8 Passat
- Antenna cables - Touareg 2004 > 2006
Tip:
Part numbers listed in this bulletin are for reference only Always check with your Parts Dept. for the latest parts information.