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A few more hours of some really in depth searching and I managed to stumble upon the mating connector. The issue is that the official mating connector isn't in stock, the alternative mating connector has a minimum order quantity higher than I want to buy at the moment, and I'm not 100% sure if the alternative will properly mate with the 90980-12558 based on drawings alone.

There's another cheaper and more readily available way to do this that isn't as nice, and it involves inserting unshrouded header pins into the connector and taping it up securely. That will have to do for testing when the parts arrive.
 
The connectors and terminals were delivered and I made a pass through harness in order to measure the power and speaker voltages and tap into the CAN bus at the speaker controller. I captured some CAN data while shifting from park to reverse to neutral to drive and back to park, but there are a lot of messages to sift through before knowing what alters the behavior of the speaker controller with any certainty. That would be the ideal situation though, making a CAN interceptor board that just alters the necessary messages that the speaker controller sees to change the volume.

Anyway, I'll verify if the amplifier output is single ended or bridged (it's likely bridged) because that will determine how to design the resistor attenuation network to reduce the volume.
 

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Anyway, I'll verify if the amplifier output is single ended or bridged (it's likely bridged) because that will determine how to design the resistor attenuation network to reduce the volume.
I don't see why it matters if it's bridged or not. It's a 2-terminal amplifier driving a 2-terminal transducer. Any attenuator that will work for a single-ended amp will work for a bridged amp as long as no external connections are added to the network, e.g. a connection to chassis ground.
 
If the attenuation network is only made of resistors between the two output terminals then you're right that it wouldn't matter if the amplifier output is single ended or bridged.

I'd like to use FETs to switch in different value resistors for different levels of attenuation, but it's not just a simple FET to ground in parallel with the load if the output is bridged. It's only speculation that it is bridged until I get a chance to measure the outputs while the speaker is active.

Edit: Relays instead of FETs would simplify things a bit... not terribly fond of clicking relays but it would be the easier approach.
 
When I'm driving very slowly thru parking lots and people are walking in front of me unawares I'm behind them the lower volume in forward mode is barely loud enough to let them know I'm there so moving the speaker would make that condition worse. I actually wish the forward volume was a bit higher for this sort of thing as I've actually had to toot the horn briefly to wake someone up in this scenario.
Making the forward driving alert sound louder would be horrible. My Toyota Corolla has no real insulation and the alert sound comes straight inside the car while driving under 25mph. I drive 6-8 hours a day and has to listen to this horrible sound constantly since I drive a lot in low speed areas. It is making me crazy. I am at the point only after 1 week of owning this hybrid that I don't want to drive it. It is truly a torture to listen to this screeching sound while driving. This sound meant to be to alert pedestrians. Why is driver tortured instead? There has to be a better solution to this.
 
furthermore, no one has taken charge of the problem that that noise (probably frequencies/harmonics) make the horses "run amok"!
the stables that I frequent has forbidden to park inside if the noise is not disabled!
not too long ago I pulled up next to a couple of horses. they seemed a little bewildered but otherwise did not react much.
 
In the US

"49 CFR § 571.141 - Standard No. 141; Minimum Sound Requirements for Hybrid and Electric Vehicles."

"In 2011 the European Commission drafted guidelines for acoustic vehicle warning systems (AVAS). The goal is to provide manufacturers with recommendations for systems installed in vehicles to provide audible signals to pedestrians and vulnerable road users."


Might be prudent 🤔 to .understand the laws regarding electric and hybrid, vehicle warning sounds in your area or country before disabling
 
Making the forward driving alert sound louder would be horrible. My Toyota Corolla has no real insulation and the alert sound comes straight inside the car while driving under 25mph.
You have a very unusual, uncommon use of a car. The purpose of the warning is to ALERT pedestrians. Let's hope they don't design this feature for one-off users like yourself otherwise it will be even more worthless than it already is.
 
I relate to you wanting to be considerate to equine friends. What if you forget to turn it back on when you are away from them? I was at a Toyota dealer where someone was driving a Prius with the sound removed. I almost got hit because I did not hear the car. I really don’t want to get hit or take someone to a court. Ultimately, we all lose.
Modern ICE cars are a lot quieter than that dang noise. I recently startled a woman walking down the middle of an aisle in a parking lot. I had been driving behind her in my Mustang (Ecoboost, not GT) for about 20 seconds before she turned and noticed I was there. If my RAV4 just made a similar level of noise as my Mustang at slow speeds I wouldn't mind it.
 
May I ask how this is the giant RISK that everyone seems to think it is? When I put my stock, gas engine, 2015 4runner in reverse it does not make an overly loud and disruptive noise while I am backing up? Unless you have a diesel or a modified vehicle (more specifically modified headers and/or exhaust) most gas engines do not even make very much noise when in reverse. Let alone, how fast are you back up? If I m in a parking lot moving at 1 mph in reverse, what is the RISK here?
Not to mention, in addition to rear-view mirrors, my RAV4 comes with a back-up camera, parking/pedestrian sensors, cross-traffic alert, and automatic braking if it does detect a pedestrian. Yet they still have to make this annoying racket?
 
Yet they still have to make this annoying racket?
First they required loud backup beepers on heavy equipment, then they required workers to wear hearing protection.
Next step will be to require pedestrians to wear earplugs when crossing a public street, then they will mandate louder AVAS, then ... :LOL:

Kind of reminds me of the very early days of horseless carriages, when (up until 1896) they had to have a flagman walk ahead of them to warn people they were coming.
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