Had my windshield replaced last week, and then this week this black rectangular plastic thing dropped in front of me. Held in place by a wire attached to it going under the headliner - length of wire about 1". The thing is about 6-7" long, 3/4" high, 3/8" thick, more or less. It had been held in place on the inside of the windshield by double stick tape. This is a 2015 Honda Accord V6 with no add-ons (Lojack, etc.). (It does have standard collision detect and lane departure warnings. Doesn't have adaptive cruise control.)

enter image description here

(In the picture above, I've stuck it back on the windshield with the double stick tape. You can see the wire above it going under the headliner, this wire is about 1/8"-3/16" thick.)

I honestly believe I had never seen the thing attached to the inside of the windshield, ever - I've had the car a year. (But if its original position was shoved a bit higher against the headliner it would have been pretty much out of my sight line, and from the outside it would have been difficult to see behind the tint.)

Went to the Honda dealer and asked "what is that thing?" Stumped everyone, including the service manager (a long-time Master Technician). We couldn't find one on the inside of a showroom Honda Accord. He spent 30 minutes with me looking through (computerized) service manuals at various components - mainly antennas or sensors - and couldn't find it anywhere.

Based on those manuals (and his knowledge) it doesn't appear to have anything to do with XM radio, the collision warning system, the lane departure camera, the nav system's GPS, or anything else we could think of.

His only suggestion: Whatever it is, it was something that was supposed to be wedged between the headliner and windshield, and it dropped out when the old windshield was removed, and the windshield tech didn't know what to do with it after he replaced the windshield so he just taped it in place.

So .. what is this thing? Is it a Honda component for some purpose or other? Or did the FBI covertly install it to track me for some reason? (*)

(*) For the record, I know of no such reason.

P.S Reason I want to know is: The car is leased. I want/need to return it the way I got it. So if the thing is supposed to be under the headliner I need to go back to the glass vendor and have them redo it correctly.

  • Great question. Personally, I would take it back to the glass vendor anyway. Two reasons: if they have ever seen it before, they'll recognize what it is and why it's there; secondly, if it fell down after they did the glass, they should have fixed it correctly in the first place. Ultimately, you may need to do a trace on it, as in follow the wire to its destination to figure out what it is. If the Honda dealership cannot figure it out, I think my paranoid side would start to take over. Apr 4, 2016 at 23:59
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    @Pᴀᴜʟsᴛᴇʀ2 so to prevent making the question even longer than it was ... I left out that I did take it back to the glass people, and a different technician looked at it and said he had never seen anything like it. So I went to Honda. But I think you're right: if no one here identifies it then a) I need to take it back and get them to investigate it properly, and b) I need to lawyer up. :-)
    – davidbak
    Apr 5, 2016 at 0:02
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    I'm agreeing with you on both counts. Don't ever worry about giving too much information in a questions, as long as the info is pertinent. I think there is a character limit of 30,000 characters or something ... really, that's a novella. Apr 5, 2016 at 0:04
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    Do Accords offer the option of Syncing to a garage door opener?
    – mikes
    Apr 5, 2016 at 0:59
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    Thank you for following up with what it was! I JUST noticed this in my 2016 cr-v today (I've had it 2.5 years) and this post came up in my 3rd search attempt (after checking my manual). It was driving me a bit nuts... I do, in fact, have remote start!
    – Seren
    Jan 5, 2019 at 4:59

1 Answer 1


Figured out it (thanks to a shove in the right direction by @mikes): It's the remote engine start accessory's antenna.

I didn't think of it when I was asked if I had "add-ons" because it's an official Honda accessory (that I can't do without!) installed by the dealer before taking delivery.

Specifically, see this exploded diagram part #4:

exploded diagram of parts of the official Honda remote start accessory

I went back to the Honda dealer and got a copy of the installation instructions. (32 pages. To install the thing you first remove the roof console/sunglass holder, the sunvisors, the driver's door opening seal and driver's A-pillar trim, the driver's dashboard under cover and lower cover, a self-tapping screw from the rear trunk lid and fuel fill door opener cover, the driver's door sill trim, the driver's kick panel, the (steering wheel) column band, the upper column cover, a self-tapping screw on the lower column cover, and finally the lower column cover. Now you can install the f-ing antenna and you're only on page 13 of the instructions! You've still got the control units and wiring harness to go... No wonder this accessory, with installation, was so surprisingly expensive!)

Anyway, it's actually supposed to be installed on the windshield up flush against the headliner - but not under it. That's out of my sightline as a driver for sure - and probably any reasonably sized driver at that.

If I ever get the energy I'll peel it off and reattach it (with new tape!) in the proper place.

  • Nice one. That was a real head scratcher. Apr 6, 2016 at 16:12

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