scn101 Posted January 22, 2021 (edited) I noticed today that I cannot lock or unlock any of the three passenger doors via Intelligent Access (IA). The driver's door lock and unlock using Intelligent Access works just fine so the FOB is OK (same issue using the spare FOB). The FOB's lock/unlock buttons works properly on all doors (1st push unlocks the driver's, 2nd push unlocks all, lock locks all four). Trunk opens when I push the trunk button on the trunk if I have the FOB when the car is locked, as expected. Keypad works as expected too. I know IA used to work but recently had 2019 MKZh in for an oil change and a rattle, not sure if that's related. I can't find any setting that disables IA on all doors except the driver's. Thoughts? Seems like a problem for the dealer to sort. Edited January 23, 2021 by scn101 Share this post Link to post Share on other sites
bbf2530 Posted January 23, 2021 4 hours ago, scn101 said: I noticed today that I cannot lock or unlock any of the three passenger doors via Intelligent Access (IA). The driver's door lock and unlock using Intelligent Access works just fine so the FOB is OK (same issue using the spare FOB). The FOB's lock/unlock buttons works properly on all doors (1st push unlocks the driver's, 2nd push unlocks all, lock locks all four). Trunk opens when I push the trunk button on the trunk if I have the FOB when the car is locked, as expected. Keypad works as expected too. I know IA used to work but recently had 2019 MKZh in for an oil change and a rattle, not sure if that's related. I can't find any setting that disables IA on all doors except the driver's. Thoughts? Seems like a problem for the dealer to sort. Hi scn. My first recommendation would be to check the Driver Information Center to see if a setting had been accidentally changed. However, if you already checked and that is not the case, then I agree that it sounds like a problem for the Dealer to sort. Let us know how you make out and good luck. Share this post Link to post Share on other sites
scn101 Posted January 23, 2021 As I thought more about the issue I figured I'd try a hard reboot of all the computers in the vehicle before taking it to the dealer. I disconnected the negative battery terminal for about an hour. Reconnected the battery and low and behold, IA now works on all doors. These really are rolling computers. Share this post Link to post Share on other sites
bbf2530 Posted January 23, 2021 (edited) 29 minutes ago, scn101 said: As I thought more about the issue I figured I'd try a hard reboot of all the computers in the vehicle before taking it to the dealer. I disconnected the negative battery terminal for about an hour. Reconnected the battery and low and behold, IA now works on all doors. These really are rolling computers. Hi scn. Happy to hear the battery disconnect worked for you. However, if this (or other similar issues) happens again, I would make one recommendation: Disconnecting the battery is often a temporary band-aid/fix for a deeper issue that may/will probably reoccur at some point. And when it does, it will often be after your warranty has expired. So if this happens again, I would make a service appointment to have the problem properly diagnosed to find the underlying issue, while your 2019 MKZ is still within warranty. Hope this information helps and good luck. Edited January 23, 2021 by bbf2530 Share this post Link to post Share on other sites
scn101 Posted January 23, 2021 That's my plan. If it happens again, off to the dealer for further diagnosis. Share this post Link to post Share on other sites
scn101 Posted January 29, 2021 Furthering the story. IA again quit on all passenger doors. So this time I decided to disconnect the battery and fully recharge it. Put it back in the vehicle and did a BMS reset (ignition on without starting the car [don't press the brake], flash the high beam 5 times, then press the brake three times and you'll see the little red battery icon flash 3 or 4 times indicated the BMS was reset). That worked for about a day. I also noticed that if you sat in the vehicle after driving it and turned off the ignition without opening a door, the radio and center screen would cut out and die after about a minute instead of the usual 20 minutes, after that IA no longer worked on the passenger doors. So I went to the dealer and they diagnosed it as a failing battery. This is surprising as I tested the battery using a Schumacher BT-250 battery tester that has always reliably called out bad batteries vs good ones and the one year old battery showed up as good on it. Anyways, the dealer replaced the battery. If that's the fix then I guess I can't trust the BT-250, but if IA fails again, I'll go back to the dealer and report back here. 1 R2D2 reacted to this Share this post Link to post Share on other sites
