 | Home > In Car Electronics > Hands free microphone problem |
 
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| SteveK Member Since: 21 Jan 2015 Location: Bromsgrove Posts: 331   
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I fitted a JVC/Kenwood KW-M745-DBT unit around two years ago and until recently everything worked fine.
The hands free phone option is (or was) a useful feature, however the microphone doesn’t work properly now. I don’t think the microphone is faulty though, this is because when I press the phone icon on the screen and say “Hey Siri call xxxx” it dials the number. The person that I’m calling can’t hear anything. Somehow the microphone is being muted. I have reset the unit to factory settings, but this didn’t work. I’ve been around in circles looking through the menus on the unit and I can’t see anything of relevance in the manual. Any thoughts anyone? |
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5th Mar 2023 6:17pm |
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| SteveK Member Since: 21 Jan 2015 Location: Bromsgrove Posts: 331
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It’s on the B pillar and was working perfectly fine until recently. If it can pick up “Siri” commands then surely it should also work for ordinary speech?!
As mikes are relatively cheap I will try a replacement and see if that makes a difference. |
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5th Mar 2023 6:45pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 19568
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That’s true, sometimes these things do just stop working and like you said they aren’t overly expensive.
Damp and corrosion inside electronics wouldn’t surprise me. Diesel$ Live$ Matter. ⛽️🛢️👨🔧🧰⚙️ RED, WHITE & BOOST! 🇬🇧 |
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5th Mar 2023 9:13pm |
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| discomog Member Since: 09 May 2015 Location: Notts/Lincs Border Posts: 2495 
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Just a thought. Is "Hey Siri" being sensed by your iPhone and not through the microphone as you suggest. The Siri command is then being sent from your iPhone to the head unit totally bypassing your car mike. Defender 90XS SW
Mini Countryman Cooper S Morgan Plus 8 |
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6th Mar 2023 7:49am |
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| SteveK Member Since: 21 Jan 2015 Location: Bromsgrove Posts: 331
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Yes, that is a very good suggestion! I’ve picked up a new microphone for a tenner and I will test it out as soon as I get a chance.
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6th Mar 2023 10:43am |
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| matchap801 Member Since: 05 Aug 2021 Location: Somerset Posts: 120 
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Check the manufacturers website for a firmware update. Usually a download, send to USB stick, hove it into the stereo, switch on, update, restart, all good 👍 2009 Defender 90 CSW 2.4 TDCI.
Ex Army Mechanic still living the dream. |
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6th Mar 2023 2:08pm |
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| nosnibod Member Since: 15 Aug 2007 Location: West Midlands Posts: 365 
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I suggest it might be very worthwhile to make sure that the microphone is still plugged into the back of the head unit. With heavy cables vibrating around behind the dash it’s very easy for the microphone to work it’s way out. Dave
Gracie - 2015 110 XS County Station Wagon |
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6th Mar 2023 3:14pm |
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| SteveK Member Since: 21 Jan 2015 Location: Bromsgrove Posts: 331
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I will certainly try a firmware update - just downloading now!
I have already checked and cleaned the connection to the mike. |
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6th Mar 2023 3:42pm |
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| SteveK Member Since: 21 Jan 2015 Location: Bromsgrove Posts: 331
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Oh dear! I've just updated the firmware and now the unit won't turn on!!
I will have to investigate later as I have to go and visit my wife in hospital. |
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6th Mar 2023 5:11pm |
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| matchap801 Member Since: 05 Aug 2021 Location: Somerset Posts: 120
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Nightmare. Did you follow the update guide PDF part way down the page - there are two parts to it. The ARM part and the MCU part.
https://www.jvc.net/cs/car/firmware/2018/kwm745dbt/ 2009 Defender 90 CSW 2.4 TDCI. Ex Army Mechanic still living the dream. |
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6th Mar 2023 7:43pm |
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| SteveK Member Since: 21 Jan 2015 Location: Bromsgrove Posts: 331
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Yes, i followed the instructions. Tomorrow i will have a look and perhaps disconnect the battery for a while if it still doesn’t switch on.
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6th Mar 2023 8:22pm |
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| matchap801 Member Since: 05 Aug 2021 Location: Somerset Posts: 120
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Ooohhh.
 . I searched for the model number and added "bricked" there is an issue around radio stations.
On a previous device I owned, I updated the firmware and mcu = black screen. Following forum advice, I downloaded an older version of the firmware - and flashed that. Then updated to the next version, then next version etc up to the latest version. The issue seemed to be that each update didn't wipe the memory fully so by going from an earlier to the very latest left traces of the old programme causing it not to boot properly. Hopefully you will get sorted quickly and please let me know how you get on 😊 2009 Defender 90 CSW 2.4 TDCI. Ex Army Mechanic still living the dream. |
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6th Mar 2023 9:24pm |
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| SteveK Member Since: 21 Jan 2015 Location: Bromsgrove Posts: 331
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That sounds like a plan. I will see if it’s working tomorrow and try disconnecting the battery if it doesn’t. Finally I will try the firmware version option.
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6th Mar 2023 9:30pm |
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| matchap801 Member Since: 05 Aug 2021 Location: Somerset Posts: 120
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Good luck. 2009 Defender 90 CSW 2.4 TDCI.
Ex Army Mechanic still living the dream. |
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6th Mar 2023 9:50pm |
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