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I simply yanked the Data Communications Module (DCM) fuse on my GR Corolla, but that has the unfortunate side-effect of also disabling the microphone. That mean
by steelframe 2y ago
I simply yanked the Data Communications Module (DCM) fuse on my GR Corolla, but that has the unfortunate side-effect of also disabling the microphone. That means the only way for me to take hands-free phone calls is with the speaker phone option, so I've simply stopped taking phone calls at all when I'm driving.
When researching how I might be able to do something more surgical I ran across this post by someone who did it with their Tacoma:
https://www.tacomaworld.com/threads/simpler-solution-for-disabling-the-dcm-telematics-silencing-antennas.821649/ https://www.tacomaworld.com/threads/simpler-solution-for-dis...
Reading this HN post on the Chevy Volt it's starting to look to me like the general approach of installing a 50ohm "silencing antenna" could end up working for a lot of different cars out there. I'll certainly be giving it a try on my GR Corolla now so I can get the microphone back while still keeping the DCM disabled.
- tivert 2y ago> I simply yanked the Data Communications Module (DCM) fuse on my GR Corolla, but that has the unfortunate side-effect of also disabling the microphone.... > Reading this HN post on the Chevy Volt it's starting to look to me like the general approach of installing a 50ohm "silencing antenna" could end up working for a lot of different cars out there. I'll certainly be giving it a try on my GR Corolla now so I can get the microphone back while still keeping the DCM disabled. I started researching this again because of this, and it looks like you may need to watch out for "Dark Draws" (https://www.reddit.com/r/subaru/comments/1bn1c3a/dcm_bulletins_updates_and_clarifications_1531824r/ https://www.reddit.com/r/subaru/comments/1bn1c3a/dcm_bulleti...) where the DCM trains the battery because it couldn't make a connection. Apparently this has been a problem with some 3G based units when they shut 3G down. It looks like Subaru, at least, has made a replacement DCM "bypass" box to allow the DCM to be removed without disabling other car features: https://static.nhtsa.gov/odi/tsbs/2024/MC-10251102-0001.pdf https://static.nhtsa.gov/odi/tsbs/2024/MC-10251102-0001.pdf
- steelframe 2y agoThanks for the heads-up about that. If I go this route then it looks like I'll want to measure battery drain both before and after installing the silencing antenna.
- joshu 2y agoah yes, i recall the excitement of my GRC calling emergency services repeatedly while i was out on track. definitely just what i wanted.