I have a 2004 Ford that uses one wire resistor signal for steering wheel control. I wasn't able to get the AXXESS SWC-1 to work right so I tried removing it and just connecting the one wire from the steering wheel to the Key-1 wire. That made it work but for some reason i have to program the buttons more than once. I have three different programs for each of the 4 buttons. It's like there is some king of ground shift going on causing the radio to see a different resistance at different times. I have the SWC ground off the back of the radio connected to the same ground as the radio, should that be connected to the ground that feeds the steering wheel buttons?
It's not so much of a problem as it is an annoyance to keep having to assign the buttons again and again till i have all the possible scenarios covered.
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A while back I remember hearing that if you left your key fob for your car at home and accidentally left your keys in the car and locked yourself out, you could call home and have the person put the key fob to the microphone of the phone and you put your phone next to the door of your car. They press the remote, sending the radio signal over the phone. I've always wondered if this was actually possible and, if it is also possible to emulate the same radio frequency using your cellphone.
From my car/steering wheel I have to cables
Can high
Can low
Any way to get those connected to the MTCD unit?
On unit I have key 1 key 2?
Volvo V70
I believe looking at the instructions that key1 and key2 are keypress type inputs into the device similar to the illumination cables that tells the HU your lights are on and dims the display. I believe they work on a 12v signal (although you might want to confirm that and do a little more research before trying) idea being you could maybe hook up two dashboard buttons that when you press them you could get the unit to do something (run an app or trigger some code).
I think the Can High and Can Low are high and low signals from the onboard computer. I think the two are incompatible. But I am certainly no expert.
Key 1 and 2 are for resistive steering wheel controls. They have nothing to do with CANBUS.
You are going to need a CAN bus adapter for steering wheel control.
This transforms the CAN signal to the head unit into a resistive signal which can be connected to the key 1 and 2 of the head unit loom.
I would attach a picture of what this adapter looks like but I'm not allowed yet.
What year is your Volvo V70 ?
Hello,
I guess my headphone jack button event is handle by msm8974 because the input event name is msm8974-taiko-mtp-snd-card_Button_Jack.
It does work fine if I use a headset which does match the following technical specifications: source.android.com/devices/accessories/headset/plug-headset-spec
But I want to use a headphone jack button. Unfortunanaly all smart headphone jack buttons without microphone doesn't work with my msm8974 module. I did messure them an find out that the mic resistence is missing. According to source.android.com/devices/accessories/headset/plug-headset-spec the mic resistence is required. I guess the implementation of my msm8974 module can't handle this.
I did monitor the events and the only thing I got during button press with GND and Mic 10 Ohm is a headphone pluged in event.
I have the following ideas to solve the problem:
put a 0603 SMD resistor between GND and MIC on the male jack. It's very tight there and my be possible if I could grind the jack a little bit. But soldering on the male jack surface would be very painful. Well, I could use an resistor on top of the plug, like this: youtube.com/watch?v=mn_xYEkDMDQ but I don't want to add so much fragile offset to my phone. I prefer the integrated solution: google.com/search?q=quick+button+jack&tbm=isch
put a resistor inside the phone on the flex cable of the female connector. I have enough room inside my phone for another resistor but it's really difficult to solder on the flex cable because the lines are very small and tight together. I would not able to do this without a microscope.
change the implementation of msm8974 headphone jack handling to make it able to find the button events even without mic. There are many phone out there which are compatible with this incorrect headphone jack button. Does anybody know how to find the according kernel module and how to alter it?
change the headphone event check intervall of msm8974. If the headphone detection would be a lot faster I could listen for headphone plugin events instead of key events. But currently it does take 1-3s until the event fires. Which means I need to hold the button 3 seconds to close the circuit long enough until the headphone detection event got detected.
do you know other ways to add another hardware button to the phone without try to fit an arduino into the phone?
My msm8974 device is a Sony Z3 Compact.
I hope some of you have ideas to solve this problem.
Hi, i'm looking for universal head unit, with preferably latest HW, or px5 at least, that is 7" so I can stick matte screen "protector" on it.
What I can find is unit that still has hw button for next/skip song and volume knob (NOT volume +/- buttons). Or support BT remote that I can put on my steering wheel. I have old car with no resistivity based neither can steering wheel controls.
S far only unit I found that at least remotelly looks usable is some sony with android auto, but I kinda wanted to go with chinese android unit as I can have apps directly on it etc. Thought no next song HW button or buttons instad of knob for volume are really deal breaker.
I know modern cars are full of touchscreen so chinese manufacturers are probably going that way, well I have old car so I obviously don't like that
Anyway do you know of any chinese HU with form factor I would like or with working support for bluetooth steering wheel remote at least?
I’ve got a PX6 12.1 screen for my ranger but the steering wheel buttons have been playing up with the volume down putting volume up and volume up skipping track it would sometimes be fine other times play now it’s permanently swapped to the buttons are doing the wrong thing. It’s had a new canbus module and no difference. Does it sound like a hardware fault? Are there any other setting that I can check. I’ve tried reprogramming the buttons in the steering settings but my unit doesn’t support that.