Piston Slap: A GPS-targeting Sleeper Agent?

TTAC Commentator Waftabletorque writes:

Dear Sajeev,

I’m having an issue diagnosing a navigation system problem on my 2002 LS430. I’ve gone a few years with the GPS link not working, which means it no longer receives a satellite signal and defaults to dead-reckoning mode (the GPS symbol disappears on the touchscreen). It’s a nuisance issue but it’s low on my priorities.

It also happens that I’ve been using a dashcam for the last four years. I never linked the two together until I had a couple of dashcams go bad in 2016, and spent the whole summer without one. Well, my GPS started working again, and I chalked it up to a warm summer fixing some sort of electrical wiring fault in the antenna.

Once I got my fourth dashcam in September, I noticed my GPS stopped working again. It was getting cold in the mornings and I thought my good luck spell had ended. Then, it occurred to me that maybe the GPS gets disabled when the 12V was in use. I’ve since found that it’s true for all three of my 12-volt ports (cigarette lighter, arm rest, rear seat cigarette lighter).

None of my other electrical loads (seat heaters, defrosters, seat massagers, headlights, fridge, etc) seem to trigger this issue, and I replaced the car battery in 2013.

So, what’s my next step? Is this a grounding issue? Voltage issue? A conspiracy of aftermarket electronics deliberately disabling automotive functionality?

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  • Arthur Dailey Good. Whatever upsets the Chinese government is fine with me. And yes they are probably monitoring this thread/site.
  • Jalop1991 WTO--the BBB of the international trade world.
  • Dukeisduke If this is really a supplier issue (Dana-Spicer? American Axle?), Kia should step up and say they're going to repair the vehicles (the electronic parking brake change is a temporary fix) and lean on or sue the supplier to force them to reimburse Kia Motors for the cost of the recall.Neglecting the shaft repairs are just going to make for some expensive repairs for the owners down the road.
  • MaintenanceCosts But we were all told that Joe Biden does whatever China commands him to!
  • Rick T. If we really cared that much about climate change, shouldn't we letting in as many EV's as possible as cheaply as possible?