Adding BT to JDM 100 with Nav--thoughts?

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mdcoa

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Bought a 1999 JDM UZJ100 (with Nav-ugh) in Feb. Would love to be able to listen to music in it; if I could just get BT streaming working, I'd be pretty content.

Challenges:
  • FM frequencies in Japan are different than here (with just a couple MHz overlap), so no radio. Radio sucks anyway. And this means US BT adapters that use FM frequencies won't help me out. And Japanese BT adapters that broadcast on Japanese FM channels are technically illegal here.
  • Cassettes suck, and I got rid of all mine about 30 years ago.
  • Factory CD changer works only once in a while--most of the time it can't tell there's a magazine inserted, and therefore won't even eject the magazine
  • Cassette adapters for BT suck--I actually replaced my speakers becasue the sound was so bad I thought my speakers were blown.
  • Plugs in the back of the factory audio unit are different from those of US NAV models, so something like the GROM BT3 is a non-starter (I ordered one and tried)

Possible ways forward:
  • Aftermarket unit to replace whole Nav/Climate/Audio system, like this. But @ActionJimson tried one of these in a JDM with Nav and couldn't get climate control to work, so probably not the best idea.
  • Replace factory amp with an Amp that also has BT connectivity and a controller for BT (JVC KS-DR2104DBT for example). If I can figure out the wiring, this would retain (the mostly useless) factory audio AND let me stream BT.
  • Bypass factory stereo completely and add a marine digital media receiver (either one with a built in amp like this or one with no amp which I could wire in before the factory amp)
  • Or a marine black-box receiver like this, which would also get wired in before the factory amp, and would allow BT, AM, FM, and wired AUX input. Would also render factory audio inop.
I'll obviously be calling Crutchfield for their thoughts on those last three, but wanted to ask the hive-mind here what might be cleanest/easiest/least destructive to existing systems and harness. And am I failing to think of another way ahead that might be even simpler (like splicing an AUX input into the existing harness)? Thanks for any thoughts!
 
New JDM owner and dealing with the same issue, any luck with a good solution? Mine just has a double din radio, not integrated touch screen. Thanks!
 
I realized this note has a long preamble and a very short answer; feel free to skip down to SHORT ANSWER.

----long preamble----
I think I found a good solution, right about the time a ton of other issues came up, so haven't installed or tested the audio solution I came up with.

Which is basically bypassing the entire factory system upstream of the amp-speaker wires using:
1) a Memphis Audio SMCHLA headless unit with a neat little switch for volume, source, track, power, play/pause
2) a custom M2 V1 Left that @BenCC made up for me, in which the SMCHLA switch will fit. Here's the normal one
3) 2 Deutsch 8-pin connector kits , which I will use to hack into the speaker wires down at the factory amp under the seat. I'll put one of these connectors on the stubs left after I cut so the whole process can be reversed by just plugging the speakre wires back into the factory amp (in case I want to return to having no audio functionality.

SHORT ANSWER:
But if you've got a non-nav double-DIN system, rejoice! I think there are sooo many easy options, and it should be basically the same as replacing the Double-DIN in a US model (although I may be worng on that).

Head unit for 100 series.


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Update the Head unit in a 1999 LC100?


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Installing aftermarket double din in an 01 non navi


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