Audio System Quirk

Smooth Operator · 09-04-2004, 12:53 AM

I was adjusting the loudness today using the steering wheel control and decided to change the station. No go.

I later experimented using the radio knob, the steering wheel controls, and the video screen. I couldn't change the station while adjusting the loudness using any combination.

Not that I would want to do that frequently, but I found it a curious piece of information.

**TonyPSchaefer** · 09-04-2004, 01:07 AM

Is your Prius white, per chance?
Could be a blonde thing.

brosnan · 09-04-2004, 08:49 PM

At least for the switches on the steering wheel, several functions are shared per wire. So it can't detect multiple button press operations for related functions. The car distinguishes which button is pressed on each shared wire based on the resistance each switch presents to ground when pressed, but when 2 or more buttons are pressed, only the one with the lowest resistance (usually 0) "wins".

09-04-2004, 12:53 AM	#1
Smooth Operator Join Date: Jan 2004 Location: Cowichan Bay, BC Canada Posts: 166 My Car: Model: Package: Thanks: 0 Thanked 0 Times in 0 Posts Friends: 0	Audio System Quirk I was adjusting the loudness today using the steering wheel control and decided to change the station. No go. I later experimented using the radio knob, the steering wheel controls, and the video screen. I couldn't change the station while adjusting the loudness using any combination. Not that I would want to do that frequently, but I found it a curious piece of information.

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09-04-2004, 01:07 AM	#2
TonyPSchaefer Your Friendly Moderator Join Date: May 2004 Location: Far-North Chicagoland Posts: 10,503 My Car: 2004 Prius Model: Package: #9 Thanks: 39 Thanked 165 Times in 106 Posts Friends: 23	Is your Prius white, per chance? Could be a blonde thing.

09-04-2004, 08:49 PM	#3
brosnan Senior Member Join Date: May 2004 Location: Silicon Valley Posts: 159 My Car: 2010 Prius Model: IV Package: Navigation Thanks: 0 Thanked 0 Times in 0 Posts Friends: 0	At least for the switches on the steering wheel, several functions are shared per wire. So it can't detect multiple button press operations for related functions. The car distinguishes which button is pressed on each shared wire based on the resistance each switch presents to ground when pressed, but when 2 or more buttons are pressed, only the one with the lowest resistance (usually 0) "wins".