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[Q] Slimport (HDMI) + bluetooth in car

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qaelith.2112
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Question [Q] Slimport (HDMI) + bluetooth in car

This may be such an unusual use case that it hasn't been an issue for anyone other than me, but here's to hoping for a solution...

I've just bought a new car (2015 Honda Fit) which has a decent size LCD panel in the dash (but I opted not to get the expensive navigation system) and which also has full bluetooth integration and, surprisingly, an HDMI port for the screen. HDMI is one of the "source" settings, and Bluetooth is a separate one.

I've paired my Nexus 5 to the car in order to take and make phone calls and get the other integration features such as music and podcast playback over the car's audio. I had this idea that if I were to run the Nexus 5 through the large screen using HDMI (via a Slimport adapter), I can have a much nicer Google Maps based navigation system that would give something close enough to the experience of the in-dash nav system minus the touchscreen -- which is fine, as I can set the route, put the phone in a cupholder, and not bother with it again.

Now, here's the fatal snag. While the phone is paired to bluetooth, it insists on sending 100% of its audio through Bluetooth and doesn't send it through HDMI. The car is either-or on the sources. If it's on HDMI, it only plays back HDMI. The screen displays exactly as I hoped -- but no audio at all (again, it's going to Bluetooth). Now, I can switch over to Bluetooth and hear the sound but not get the display. I could kill the pairing to get both through HDMI, but now I lose the ability to receive calls over bluetooth with the handy steering wheel call answering and all of the amenities associated with that.

I'm wondering if there is some kind of workaround -- Android configuration that I've somehow never noticed, or a third party app -- which will allow the Nexus 5 to remain paired and actively Bluetooth connected while still sending audio through the HDMI port (Slimport). I don't see that this would as likely be a car-side solution.

The Nexus 5 is rooted stock 4.3.3.

Thank you in advance for help toward a solution.
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samseed101
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Quote:
Originally Posted by qaelith.2112 View Post
This may be such an unusual use case that it hasn't been an issue for anyone other than me, but here's to hoping for a solution...

I've just bought a new car (2015 Honda Fit) which has a decent size LCD panel in the dash (but I opted not to get the expensive navigation system) and which also has full bluetooth integration and, surprisingly, an HDMI port for the screen. HDMI is one of the "source" settings, and Bluetooth is a separate one.

I've paired my Nexus 5 to the car in order to take and make phone calls and get the other integration features such as music and podcast playback over the car's audio. I had this idea that if I were to run the Nexus 5 through the large screen using HDMI (via a Slimport adapter), I can have a much nicer Google Maps based navigation system that would give something close enough to the experience of the in-dash nav system minus the touchscreen -- which is fine, as I can set the route, put the phone in a cupholder, and not bother with it again.

Now, here's the fatal snag. While the phone is paired to bluetooth, it insists on sending 100% of its audio through Bluetooth and doesn't send it through HDMI. The car is either-or on the sources. If it's on HDMI, it only plays back HDMI. The screen displays exactly as I hoped -- but no audio at all (again, it's going to Bluetooth). Now, I can switch over to Bluetooth and hear the sound but not get the display. I could kill the pairing to get both through HDMI, but now I lose the ability to receive calls over bluetooth with the handy steering wheel call answering and all of the amenities associated with that.

I'm wondering if there is some kind of workaround -- Android configuration that I've somehow never noticed, or a third party app -- which will allow the Nexus 5 to remain paired and actively Bluetooth connected while still sending audio through the HDMI port (Slimport). I don't see that this would as likely be a car-side solution.

The Nexus 5 is rooted stock 4.3.3.

Thank you in advance for help toward a solution.
I can't help ith your situation, but I'm wondering if you can help with mine. I also just bought the 2015 Honda Fit. What I want to be able to do is mirror my Galaxy S4 to the screen for navigation purposes. But from what I understand, it will only work in Park. I don't have the cable yet and did't want to buy it unless I knew it would work.

For a quick test, I plugged a roku stick in the HDMI port. As expected, it worked fine until I put the car in gear. Then the display gets disabled. Does this happen with phone mirroring? Would I be able to actually use google maps and see it while in motion or will the screen shut off? What does and doesnt work with mirroring?
 
qaelith.2112
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Originally Posted by samseed101 View Post
I can't help ith your situation, but I'm wondering if you can help with mine. I also just bought the 2015 Honda Fit. What I want to be able to do is mirror my Galaxy S4 to the screen for navigation purposes. But from what I understand, it will only work in Park. I don't have the cable yet and did't want to buy it unless I knew it would work.

For a quick test, I plugged a roku stick in the HDMI port. As expected, it worked fine until I put the car in gear. Then the display gets disabled. Does this happen with phone mirroring? Would I be able to actually use google maps and see it while in motion or will the screen shut off? What does and doesnt work with mirroring?
This behavior of the HDMI port / display actually became a far bigger problem than how to route the sound. I had been doing all of my testing with the car sitting in the garage, and because I wasn't ever able to get the sound to do what I needed, I didn't bother to go drive around with HDMI display enabled. I confirmed through this and consulting the manual that for "safety reasons" they have entirely disabled the HDMI input while the car is not in park. Unfortunately, I'd guess this is coded in the system's firmware which most of us aren't going to have a way to tamper with, so this is a fatal problem for what we're both looking to do. I was confident that there was probably some sort of solution to making audio go over both channels, but that's irrelevant in light of this problem.

So to summarize, I'll suggest not bothering with the Slimport (or the other kind of interface, if that's what your phone uses) because it will certainly be utterly useless for this and I don't foresee a solution. It looks like this thread is therefore dead. Thank you for bringing this to my attention, though -- I'd have continued working toward an audio solution and then discovered this bigger problem once I solved that one. You just saved me from wasting a lot of time.
 
qaelith.2112
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Quote:
Originally Posted by samseed101 View Post
I can't help ith your situation, but I'm wondering if you can help with mine. I also just bought the 2015 Honda Fit. What I want to be able to do is mirror my Galaxy S4 to the screen for navigation purposes. But from what I understand, it will only work in Park. I don't have the cable yet and did't want to buy it unless I knew it would work.

For a quick test, I plugged a roku stick in the HDMI port. As expected, it worked fine until I put the car in gear. Then the display gets disabled. Does this happen with phone mirroring? Would I be able to actually use google maps and see it while in motion or will the screen shut off? What does and doesnt work with mirroring?
One more thought (stating the obvious, I suppose) -- We've been hamstrung by the assumption that everyone is going to be using the display to watch movies while driving, even though we have excellent reasons which would actually make it safer (an easier to see navigation display). I guess Honda is mitigating lawsuits from the would-be idiots who might actually be watching American Idol episodes while driving to work.
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