When I tried this, warning icon popped up with "P" letter and check engine "idiot light" came on. I don't know what it means, so I reconnected it. Unfortunately, I forgot to take photos. However, I did measure sound; all are approximate. Noisemaker is only active when in R, D, L.WattEV wrote:Just disconnect the noise maker control unit. Super easy to get to. It is on the floor behind the center console next to the accelerator pedal. Where the driver side and passenger side carpets meet behind the center console, you can separate the two pieces easily as they are attached with just Velcro. Pull the Velcro apart and you will see the only control unit which is for the noise maker...It's small. Disconnect the connector and that's it.
car off: outside = 32 dBA, inside = 31 dBa
car on, normal: outside = 44 dBA, inside = 36 dBA
car on, no noise maker: outside = 32 dBA, inside = 31 dBA. It's pretty much same as in P or N.
Without the noise maker, car is silent. You might think 4 dB is not a lot, but it is very noticeable in when stopped at traffic light. It sounds like "freight train" to exaggerate a bit.
If you plan to test, removing the connector involves pulling the white tab on top toward rear of the car. That allows pressing down on the black part, and you can slide out the connector. However, it could damage the car, so don't do it unless you can afford broken car.
Edit Apr. 3, 2016
Thanks to Zoomit, it was found that removing 7.5A fuse #23 (labeled PFAF) is the way to disable the fake nose maker.
http://www.mychevysparkev.com/forum/vie ... 6&start=23
Even without the noise maker, there's still slight humming sound from the pumps, though much less. It's probably as quiet as the car can get.
As for "safety", Toyota Prius is quieter than SparkEV even without the fake noise maker. As such, I don't see this "safety" feature as doing anything useful.