Results 1 to 17 of 17

Thread: radio interference from headlights - help!

  1. #1
    Super Moderator Yamazaki's Avatar
    Join Date
    May 2009
    Location
    MD, USA
    Posts
    2,617
    Points
    17,786
    Level
    84
    Points: 17,786, Level: 84
    Level completed: 88%, Points required for next Level: 64
    Achievements:
    10000 Experience PointsSocialO.G.Recommendation Second ClassOverdrive
    Awards:
    Community Award

    radio interference from headlights - help!

    So the Forester has an issue where the radio is nice and clear.... until I turn on the lights. Then a noticeable amount of static comes in. This only happens when I turn the lights to the driving lights position, full on position, or turn on the top column switch. I've checked and double checked the connections on the radio, antenna, and antenna amplifier. I don't know what it could be. It has been suggested that it may be the integrated body unit, but I don't have any other vehicles that have one so I cannot switch it out until I get my hands on one. Anybody else have any ideas?
    Current lineup(click on links):
    His: '05 Impreza STi / '91 Suzuki Cappuccino / '15 Honda NM4
    Hers: '04 Forester XT / '02 S401

    Past lineup:
    His: '95 Legacy Brighton / '93 Suzuki Cappuccino / '08 Kawasaki Ninja 250R
    Hers: '97 Legacy GT-B Ltd / '05 Mercedes E500 4matic / '02 H6 VDC Sedan

  2. #2
    Th3 EviL OvErLORd Reason's Avatar
    Join Date
    Apr 2005
    Location
    Rhode Island U.S. of A(wesome)!
    Posts
    10,454
    Points
    57,313
    Level
    100
    Points: 57,313, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Achievements:
    O.G.SocialOverdrive50000 Experience Points

    Re: radio interference from headlights - help!

    Sounds like a grounding issue.
    4Zero1 Motorsports

    2010 BM GT
    1998 BD L EJ25/EJ22 High Compression
    1993 GSX-R 750 (version 2.0)
    1993 Suzuki GSX-R 750
    1998 BK L PARTED
    1991 Legacy SS SOLD
    1997 BD GT R.I.P. 12/24/06 Running Mean with 117 whp!
    1989 Honda CR-X A.K.A. "The Beast"
    1991 Suzuki GSX-R 750 R.I.P. 11/10/06

    SLi Facebook
    4Zero1Motorsports Facebook

    "No matter how much you've done, or how successful you've been, there's always more to do, always more to learn, and always more to achieve." - Barack Obama

  3. #3
    "Proby"
    Join Date
    Mar 2012
    Location
    San Jose, CA
    Posts
    242
    Points
    4,606
    Level
    43
    Points: 4,606, Level: 43
    Level completed: 28%, Points required for next Level: 144
    Achievements:
    1000 Experience PointsO.G.

    Re: radio interference from headlights - help!

    Check ground wire attach to your radio mount/frame loose or missing. If you have HID, check those grounds too.
    03 350Z - 120K DD
    99 RS - Currently swapping JDM V9 207
    98 RS - 145K JDM 20K V4 WRX
    02 WRX - 150K DD
    95 Legacy Wagon - 200K Winter Tahoe tank

  4. #4
    Super Moderator Yamazaki's Avatar
    Join Date
    May 2009
    Location
    MD, USA
    Posts
    2,617
    Points
    17,786
    Level
    84
    Points: 17,786, Level: 84
    Level completed: 88%, Points required for next Level: 64
    Achievements:
    10000 Experience PointsSocialO.G.Recommendation Second ClassOverdrive
    Awards:
    Community Award

    Re: radio interference from headlights - help!

    I don't have HIDs, and I've checked all the grounds of the system. Would it help if I added a grounding kit?
    Current lineup(click on links):
    His: '05 Impreza STi / '91 Suzuki Cappuccino / '15 Honda NM4
    Hers: '04 Forester XT / '02 S401

    Past lineup:
    His: '95 Legacy Brighton / '93 Suzuki Cappuccino / '08 Kawasaki Ninja 250R
    Hers: '97 Legacy GT-B Ltd / '05 Mercedes E500 4matic / '02 H6 VDC Sedan

  5. #5
    Th3 EviL OvErLORd Reason's Avatar
    Join Date
    Apr 2005
    Location
    Rhode Island U.S. of A(wesome)!
    Posts
    10,454
    Points
    57,313
    Level
    100
    Points: 57,313, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Achievements:
    O.G.SocialOverdrive50000 Experience Points

    Re: radio interference from headlights - help!

    It wouldn't hurt...
    4Zero1 Motorsports

    2010 BM GT
    1998 BD L EJ25/EJ22 High Compression
    1993 GSX-R 750 (version 2.0)
    1993 Suzuki GSX-R 750
    1998 BK L PARTED
    1991 Legacy SS SOLD
    1997 BD GT R.I.P. 12/24/06 Running Mean with 117 whp!
    1989 Honda CR-X A.K.A. "The Beast"
    1991 Suzuki GSX-R 750 R.I.P. 11/10/06

    SLi Facebook
    4Zero1Motorsports Facebook

    "No matter how much you've done, or how successful you've been, there's always more to do, always more to learn, and always more to achieve." - Barack Obama

  6. #6
    Super Moderator Yamazaki's Avatar
    Join Date
    May 2009
    Location
    MD, USA
    Posts
    2,617
    Points
    17,786
    Level
    84
    Points: 17,786, Level: 84
    Level completed: 88%, Points required for next Level: 64
    Achievements:
    10000 Experience PointsSocialO.G.Recommendation Second ClassOverdrive
    Awards:
    Community Award

    Re: radio interference from headlights - help!

    Okay, I installed a grounding kit. It didn't hurt, but it didn't really help either (with my radio problem anyway). Should I run a direct connection from the headunit to the negative terminal on the battery or would that not do anything? Are there any other ideas? It's freaking annoying to not be able to play the radio whenever the lights are on....
    Current lineup(click on links):
    His: '05 Impreza STi / '91 Suzuki Cappuccino / '15 Honda NM4
    Hers: '04 Forester XT / '02 S401

    Past lineup:
    His: '95 Legacy Brighton / '93 Suzuki Cappuccino / '08 Kawasaki Ninja 250R
    Hers: '97 Legacy GT-B Ltd / '05 Mercedes E500 4matic / '02 H6 VDC Sedan

  7. #7
    SLi nOOb
    Join Date
    May 2013
    Location
    Plainfield ct.
    Posts
    153
    Points
    3,393
    Level
    36
    Points: 3,393, Level: 36
    Level completed: 29%, Points required for next Level: 107
    Achievements:
    1000 Experience PointsVeteran

    Re: radio interference from headlights - help!

    Where is the antenna on that year forester?
    91 Legacy SS Monster Sedan (The Cleg)
    99 Legacy wagon H6 swap (Sparky)
    00 Legacy GT wagon (Red)
    02 Outback 3.0 LL Bean (Renee)
    74 Subaru DL

  8. #8
    Super Moderator Yamazaki's Avatar
    Join Date
    May 2009
    Location
    MD, USA
    Posts
    2,617
    Points
    17,786
    Level
    84
    Points: 17,786, Level: 84
    Level completed: 88%, Points required for next Level: 64
    Achievements:
    10000 Experience PointsSocialO.G.Recommendation Second ClassOverdrive
    Awards:
    Community Award

    Re: radio interference from headlights - help!

    The rear driver side window. There is also an antenna amplifier (I think) right by the antenna, but I can't read that it gets any power with my multimeter. It must be working though, since I get no radio signal if I unplug it.
    Current lineup(click on links):
    His: '05 Impreza STi / '91 Suzuki Cappuccino / '15 Honda NM4
    Hers: '04 Forester XT / '02 S401

    Past lineup:
    His: '95 Legacy Brighton / '93 Suzuki Cappuccino / '08 Kawasaki Ninja 250R
    Hers: '97 Legacy GT-B Ltd / '05 Mercedes E500 4matic / '02 H6 VDC Sedan

  9. #9
    SLi nOOb
    Join Date
    May 2013
    Location
    Plainfield ct.
    Posts
    153
    Points
    3,393
    Level
    36
    Points: 3,393, Level: 36
    Level completed: 29%, Points required for next Level: 107
    Achievements:
    1000 Experience PointsVeteran

    Re: radio interference from headlights - help!

    Hmm. You check under the rear seat area and right rear sill plate for rodent activity?

    It's doesn't look like the body module ties into the radio at all. And the only point any illumination is involved is at the head unit.
    Is it a factory radio?
    91 Legacy SS Monster Sedan (The Cleg)
    99 Legacy wagon H6 swap (Sparky)
    00 Legacy GT wagon (Red)
    02 Outback 3.0 LL Bean (Renee)
    74 Subaru DL

  10. #10
    Administrator rkrenicki's Avatar
    Join Date
    Jun 2009
    Location
    Northeastern CT
    Posts
    2,651
    Points
    23,967
    Level
    94
    Points: 23,967, Level: 94
    Level completed: 62%, Points required for next Level: 383
    Achievements:
    10000 Experience PointsO.G.SocialOverdrive

    Re: radio interference from headlights - help!

    He had the same issue with both the factory radio, and the Kenwood navigation unit, so it is not the radio itself that is having the issue.

  11. #11
    Super Moderator Yamazaki's Avatar
    Join Date
    May 2009
    Location
    MD, USA
    Posts
    2,617
    Points
    17,786
    Level
    84
    Points: 17,786, Level: 84
    Level completed: 88%, Points required for next Level: 64
    Achievements:
    10000 Experience PointsSocialO.G.Recommendation Second ClassOverdrive
    Awards:
    Community Award

    Re: radio interference from headlights - help!

    I know the rear seat area is clear of issues; I removed them to install and run the wires for the rearview camera.
    Now that I've solved the wind noise issue, I REALLY want the radio to work whenever I want it.
    I've contemplated wiring the taillights in with the DRL and just leaving the lights "off", but that would be ridiculous and I'd rather not do that.
    Current lineup(click on links):
    His: '05 Impreza STi / '91 Suzuki Cappuccino / '15 Honda NM4
    Hers: '04 Forester XT / '02 S401

    Past lineup:
    His: '95 Legacy Brighton / '93 Suzuki Cappuccino / '08 Kawasaki Ninja 250R
    Hers: '97 Legacy GT-B Ltd / '05 Mercedes E500 4matic / '02 H6 VDC Sedan

  12. #12
    t3h ch33se Wiscon_Mark's Avatar
    Join Date
    May 2005
    Location
    Plover, WI
    Posts
    9,869
    Points
    43,397
    Level
    100
    Points: 43,397, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Achievements:
    25000 Experience PointsO.G.Overdrive

    Re: radio interference from headlights - help!

    Maybe try installing a filter inline with all of your power sources to the HU and see if that helps?

    My 03 does not have this issue, aftermarket JVC unit installed.

    The only TSB I've seen on an issue like this is the rear defogger causing problems with the antenna.
    ~Mark [SLi Admin]
    2015 Dodge Charger AWD
    2008 Subaru Tribeca Limited, 7 passenger w/ Navigation

    Former vehicles:
    03 Forester
    95 Legacy Outback

  13. #13
    SLi Supporter
    Join Date
    May 2010
    Location
    NJ - near NYC
    Posts
    128
    Points
    4,737
    Level
    43
    Points: 4,737, Level: 43
    Level completed: 94%, Points required for next Level: 13
    Achievements:
    1000 Experience PointsO.G.

    Re: radio interference from headlights - help!

    There is a TSB about the rear defogger and the radio? My 2000 Sedan does that and it is quite annoying. The defogger and the antenna share the rear window in my car and every time the defogger is turned on the radio goes to static. It sucks.
    Regardie
    1997 Legacy L sedan 2.2 auto - crushed by a tree during Sandy
    All upgrades stripped and returned to stock, started up when they hauled it away

    New to me 2000 Legacy GT Limited sedan 5 speed 180K miles
    184K and running on a JDM Bilstein struts and springs set and a replacement RS 5MT
    187K, engine top half rebuilt, Delta 1500 cams, PNP, converted EJ252 to EJ251 for Delicious Stage 1 flash
    190K worked out some engine issues with the swap, now Cobb EL headers and High Flow Cat and mid pipe, muffler shop axle back

  14. #14
    Super Moderator Yamazaki's Avatar
    Join Date
    May 2009
    Location
    MD, USA
    Posts
    2,617
    Points
    17,786
    Level
    84
    Points: 17,786, Level: 84
    Level completed: 88%, Points required for next Level: 64
    Achievements:
    10000 Experience PointsSocialO.G.Recommendation Second ClassOverdrive
    Awards:
    Community Award

    Re: radio interference from headlights - help!

    Quote Originally Posted by Wiscon_Mark
    Maybe try installing a filter inline with all of your power sources to the HU and see if that helps?

    My 03 does not have this issue, aftermarket JVC unit installed.

    The only TSB I've seen on an issue like this is the rear defogger causing problems with the antenna.
    Well, the antenna on the Forester is on a different window than the defogger. Also, I just checked and the defogger has no effect on the radio.

    I am curious about this "filter" you speak of. What is it?
    Current lineup(click on links):
    His: '05 Impreza STi / '91 Suzuki Cappuccino / '15 Honda NM4
    Hers: '04 Forester XT / '02 S401

    Past lineup:
    His: '95 Legacy Brighton / '93 Suzuki Cappuccino / '08 Kawasaki Ninja 250R
    Hers: '97 Legacy GT-B Ltd / '05 Mercedes E500 4matic / '02 H6 VDC Sedan

  15. #15
    t3h ch33se Wiscon_Mark's Avatar
    Join Date
    May 2005
    Location
    Plover, WI
    Posts
    9,869
    Points
    43,397
    Level
    100
    Points: 43,397, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Achievements:
    25000 Experience PointsO.G.Overdrive

    Re: radio interference from headlights - help!

    It was a recall for all models, but obviously it's not affecting you if you have it off and still have the issue.

    I'm not necessarily recommending any of these, but here are some examples:

    http://www.amazon.com/Pyramid-NS12-InLi ... ine+filter

    http://www.amazon.com/Metra-AX-ANR1000- ... ine+filter

    Quote Originally Posted by Regardie
    There is a TSB about the rear defogger and the radio? My 2000 Sedan does that and it is quite annoying. The defogger and the antenna share the rear window in my car and every time the defogger is turned on the radio goes to static. It sucks.
    Yes, it's here: http://www.cars101.com/recalls.html

    Customer complaint of radio static when the radio and rear window defogger are on at the same time, there is the possibility of a break in one or more of the defogger grids. When the grid is broken, a high resistance field is created at the break point which can create static on some radio stations. The level of resistance is usually high enough to create a field of interference which projects out from the glass. The break can be detected visually or by using a portable radio.
    Using a portable radio, set the radio to the same frequency and station being disturbed by static. From the outside of the vehicle, slowly move the radio’s antenna across the defogger grids. When interference is encountered, inspect that specific area closely for a break. Depending upon the size of the break, a magnifying glass and/or eyeloupe may be required.
    Once the break is identified, it should be repaired using the Permatex® repair kit instead of replacing the rear glass. Note: Make sure to carefully read and follow the instructions
    and precautions that are included with the Permatex® repair kit.
    Permatex® Quick Grid™ Rear Window Defogger Repair Kit, part # 15067, used for repairing damaged rear window defogger grids, is available at local automotive parts stores.
    ~Mark [SLi Admin]
    2015 Dodge Charger AWD
    2008 Subaru Tribeca Limited, 7 passenger w/ Navigation

    Former vehicles:
    03 Forester
    95 Legacy Outback

  16. #16
    Super Moderator Yamazaki's Avatar
    Join Date
    May 2009
    Location
    MD, USA
    Posts
    2,617
    Points
    17,786
    Level
    84
    Points: 17,786, Level: 84
    Level completed: 88%, Points required for next Level: 64
    Achievements:
    10000 Experience PointsSocialO.G.Recommendation Second ClassOverdrive
    Awards:
    Community Award

    Re: radio interference from headlights - help!

    I will try that, thanks.
    Current lineup(click on links):
    His: '05 Impreza STi / '91 Suzuki Cappuccino / '15 Honda NM4
    Hers: '04 Forester XT / '02 S401

    Past lineup:
    His: '95 Legacy Brighton / '93 Suzuki Cappuccino / '08 Kawasaki Ninja 250R
    Hers: '97 Legacy GT-B Ltd / '05 Mercedes E500 4matic / '02 H6 VDC Sedan

  17. #17
    SLi Supporter
    Join Date
    May 2010
    Location
    NJ - near NYC
    Posts
    128
    Points
    4,737
    Level
    43
    Points: 4,737, Level: 43
    Level completed: 94%, Points required for next Level: 13
    Achievements:
    1000 Experience PointsO.G.

    Re: radio interference from headlights - help!

    I know I have a break in one of the rear defroster lines as I can see it not work every time I use it. Now to find the time and a sunny day for the fix.

    Thanks
    Regardie
    1997 Legacy L sedan 2.2 auto - crushed by a tree during Sandy
    All upgrades stripped and returned to stock, started up when they hauled it away

    New to me 2000 Legacy GT Limited sedan 5 speed 180K miles
    184K and running on a JDM Bilstein struts and springs set and a replacement RS 5MT
    187K, engine top half rebuilt, Delta 1500 cams, PNP, converted EJ252 to EJ251 for Delicious Stage 1 flash
    190K worked out some engine issues with the swap, now Cobb EL headers and High Flow Cat and mid pipe, muffler shop axle back

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •