07-21-2012, 06:13 PM | #1 |
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Radar Detector False
We took delivery of our new 328i this morning. We're getting a continuous K-band false signal from behind on our V1. It's not a strong signal, but enough to be annoying. Does that happen to others? What could be causing it?
It's clearly something on the car. If I turn off the ignition, the signal stops. We don't have the adaptive cruise control feature. Does anything else on the car radiate in that band? Maybe it's the foot-opening trunk feature? (Surely that's not active when the car is in motion?) I'm going to try moving the detector around to other spots to see if that helps. |
07-21-2012, 11:29 PM | #3 |
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07-21-2012, 11:29 PM | #4 |
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No, PDC is typically not on al the time. Do you have active blind spot monitoring? I understand that will set off radar detectors.
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07-21-2012, 11:36 PM | #5 | |
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I just noticed that the owner's manual claims that the PDC uses ultrasound rather than radar. |
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07-21-2012, 11:36 PM | #6 |
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Active Blind spot Detection? Try turning it off.
Two radar sensors below the rear bumper monitor the area behind and next to the vehicle at speeds above approx. 30 mph/50 km/h. The transmitter and receiver units comply with part 15 of the FCC/Federal Communication Commission regulations. |
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07-21-2012, 11:38 PM | #7 | |
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07-22-2012, 10:56 AM | #8 | |
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07-22-2012, 12:27 PM | #9 |
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It's the Active Blind Spot Detection feature that causes this. You must not be shutting it off (maybe you can't turn it all the way off?).
Anyway, from the BMW website: "At the rear of the vehicle the Active Blind Spot Detection uses radar sensors to inform the driver via a symbol on the wing mirror if there is a vehicle currently in their blind spot or if a vehicle is approaching quickly from the rear. As soon as the driver uses the indicator to change lanes, they are warned in potentially dangerous situations by a flashing LED signal and vibrations." |
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07-22-2012, 02:03 PM | #10 | |
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By "helped", do you mean helped to isolate the source, or helped to solve the problem so that you could use the V1 in the car? If the second, what did you do about it? |
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07-22-2012, 02:06 PM | #11 | |
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The irony is we were on the fence for adaptive cruise control, and didn't get it because of the potential for this very problem :-) |
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07-22-2012, 02:50 PM | #12 |
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This is a common issue with these systems. Audi's are also notorious for it. My Passport 9500ix often goes crazy when I approach a newer model Audi on the road. It sure would be nice if car manufacturers would use a different radar band than that used by police (police use both K and KA bands, depending on the radar gun manufacturer), for this very reason. They could use X band, since no law enforcement agencies use that band anymore - at least not in the US.
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07-22-2012, 03:12 PM | #13 | |
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07-22-2012, 03:22 PM | #14 |
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Heh. My wife and I tend to refer to the laser detector on the V1 as the "Infiniti Detector", since they use lidar for their adaptive cruise control. We see well more of those than we do actual police lidar. (But there's still too much police lidar to turn the laser detector off).
Along those lines, I see that I can program the V1 to mute K-band signals from the rear. I may give that a try. I wonder if all this on-board radar effects police radar? |
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07-24-2012, 03:15 PM | #16 |
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Set the V1 to "L" mode
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07-24-2012, 03:17 PM | #17 |
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09-18-2012, 08:20 AM | #18 |
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How did you turn POP off??
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09-18-2012, 08:26 AM | #19 | |
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On a separate note, this thread has me wondering if a radar detector is even worth it anymore with all these car-based false-positives? More and more police / highway patrols are switching to LIDAR, and if your detector goes off with a LIDAR hit it's probably too late anyway as the cop already has you. Not sure if the false-positives are worth dealing with for the few remaining situations / locations that use K or Ka band. Has anyone tried installed a LIDAR shifter into their F30? That to me seems like it would be worthwhile. Of course, it's difficult to tell if the darn system is actually installed properly and working, so that's a concern too... |
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09-18-2012, 08:39 AM | #20 | |
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According to V1 site, its for the specific type of radar that is fast on short bursts, sort of stealthy radar pulses rather than just a continuous beam. The V1 is a saver and very necessary, even if you have to live with the false positives, its worth it from my point of view. Laser is very different and has pros and cons from a LEO point of view, its not as widely used in my locale and has some issues with usage.
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09-18-2012, 09:21 AM | #21 |
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09-18-2012, 09:26 AM | #22 | |
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OTOH, lidar is not used that heavily around here--I guess it's usually too hot for them to roll down a window much of the time :-) When you do see it, it's often from a motorcycle. It makes for a really good Infiniti detector, though. |
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