(How-to) Hybrid Noise Emissions Reduction
Disclaimer:Use at your own risk! Not responsible for any damages or injury. It is only recommended to perform this modification in areas where lawful to do so.
The humming of the hybrid models never really bothered me, but recently the question was posed on the forum. I thought I would see if I could answer the question of the easiest way to disable the noise without any warning lights. I suspect the reduction in electrical load will provide a Minute efficiency increase.
I did not measure the resistance of the original speaker, however I found that a 40 ohm resistor is enough to satisfy the module and not cause a warning light. In theory, a 5W resistor would be required for a 12v Circuit, however I checked current with an amp-meter and only measured .05a (.6 w) so I’ve been using a ½w resistor for awhile and have not had any problem. But I’ve already ordered 5W resistors so that’s what I’ll be using here for my project.
My 2020 Hybrid has two speakers, but I'm told that for 2021 they've removed the rear speaker.
Parts needed(per speaker):
WPT-1193 connector
40 ohm 1W resistor
Constructing the harness:
This is the WPT-1193 connector. It fits snugly onto your car harness, but it will fit without modification to either connector.
Constructing the harness is very simple, simply solder or crimp each wire to either side of the resistor and wrap with electrical tape or heat shrink:
Locating the rear speaker:
Locating the front speaker is much harder, but it can be accomplished without removing the front bumper:
Find and Follow this Harness:
Reach with your arm under the radiator hose and you can find and disconnect the speaker (you may want to disconnect the battery to prevent the fan from coming on or an autostart event, I did not):
I connected my speaker simulator and zip tied it to the ground wire:
