2005 xc70, gremlins in the taillights
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    1. #1
      Junior Member
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      2005 xc70, gremlins in the taillights

      hey all, cross post from MVS.

      got some electrical gremlins in my wife's car. we seem to be loosing the taillights. at the same time we loose the front and rear fog lights. the headlights, brake lights and reverse lights continue to work the fuse is ok.


      it seems shutting off and restarting solves the issue, at least temporarily.

      any thoughts

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    3. #2
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      Top-left relay in CEM is for front fog lights:



      Relays for tail lights and rear fog lights are in REM, I didn't open it up yet.

      Do you read any errors in VIDA? Does the odo stops counting when the gremlins happen?

    4. #3
      Junior Member
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      Quote Originally Posted by vtl View Post
      Top-left relay in CEM is for front fog lights:



      Relays for tail lights and rear fog lights are in REM, I didn't open it up yet.

      Do you read any errors in VIDA? Does the odo stops counting when the gremlins happen?
      thanks. don't tell me the CEM...sent that off to Xemodex a few year back for a rebuild.

      a relay makes sense. with all the arcing and contacts sticking.

      the REM looks easier than the CEM to access and a relay is fairly easy to remove and replace. any chance you have a source & p/n for the relay? i'll see if i can pull it this weekend.

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    6. #4
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      Quote Originally Posted by mrscullini View Post
      the REM looks easier than the CEM to access and a relay is fairly easy to remove and replace. any chance you have a source & p/n for the relay? i'll see if i can pull it this weekend.
      TYCO is no more, it was bought by TE, some p/n were cancelled. You have to look at what relay is gone and try to find an alternative. Try to avoid Chinese relay, they don't live long...

    7. #5
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      Quote Originally Posted by vtl View Post
      TYCO is no more, it was bought by TE, some p/n were cancelled. You have to look at what relay is gone and try to find an alternative. Try to avoid Chinese relay, they don't live long...
      thanks.

      got a reply over on MVS, suggestion was to check fuse 5 on the rear panel, it is to the CEM apparently. the poster found corrosion on the fuse which was causing an intermittent outage. will check it out and report back.

    8. #6
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      Quote Originally Posted by mrscullini View Post
      thanks.

      got a reply over on MVS, suggestion was to check fuse 5 on the rear panel, it is to the CEM apparently. the poster found corrosion on the fuse which was causing an intermittent outage. will check it out and report back.
      pulled fuse 5 from the rear panel, sure enough corrosion. see the MVS thread here,

      https://www.matthewsvolvosite.com/fo...hp?f=9&t=73056

      my fuse looked worse than that.

      didn't have the correct amperage in the garage, cleaned the contacts with sand paper. we'll see.

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