Quote:
Originally Posted by foglesre
I guess the 100k-ohm resistors jumpering the pins in the "no buttons" case are kind of superfluous. I should be able to leave those connections open. That's the state it is in now, eh?
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I don't know. From what I remember from my testing, you can just short the pins with the correct resistors to work. If you just place a 330 ohm on it, it will do something, it's not like there is some logic that looks for a 100K ohm resistor and says "Oh, SWCs are installed, I'll pay attention to the pins now" like there is for the backup camera. You can go from open to shorted with a 330 or whatever ohm resistor and it will do something, you don't need to go from shorted with 100K to shorted with a 330. I don't see why you'd need the 100K resistors, but they are in the stock SWCs, so I personally wouldn't take a chance on deleting them, but it's your car. I'm not sure whether it is "We want to have some resistor that is so high that the HU can't even detect it to aid troubleshooting SWCs" or whether it does something. I couldn't get the SWCs to react to anything over 11.26K ohms, so that might be the smallest current that the radio can detect.
It's probably also worth mentioning here that the resistance values the SWC works with have a pretty high tolerance, and they nearly overlap. So, for instance, Seek down is 330 ohm and vol up is 1000 ohms. If you put in a 400 ohm, it will do seek down. If you do a 900 ohm, it will do volume up. Any resistor between 330 and 1000 ohms will do something. There's some crossover point that it will switch over, there is not a "gap" during which it won't do anything. For my HU, it was at 529. Anything from 330-529 was seek down, anything from 530 to 1000 was volume up, there was no value in between that didn't do anything. It probably shouldn't be an issue for you, but keep it in mind if you start having problems.
I don't remember if I posted it in my thread or not, but what gave me some confusion was that if you hold down seek up/down it turns into tune up/down (and I assume ff/rewind during CDs). So a quick press goes to the next preset, a long press will give you a beep then it will start going to the next radio station. Holding down the Mode button also acts as a Mute.