Mach-Lee
Well-Known Member
- First Name
- Lee
- Joined
- Jul 16, 2021
- Threads
- 262
- Messages
- 11,356
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- 24,983
- Location
- Wisconsin
- Vehicles
- 2022 Mach-E Premium AWD
- Occupation
- Sci/Eng
- Thread starter
- #1
The 12V lockout recall software (25S65) has been released for all Mach-E's as of today. You can now schedule to have it installed at your dealer if you have a '21-24 vehicle. The update will take the technician about 30 minutes to apply. I've already installed the software on my car, and as expected:
After the update, you may notice the slight hum of a cooling pump running after driving and parking the car (if it's warm outside). This is normal, it is cooling the DC/DC converter producing the 12V power. If it's cool outside, the vehicle will be silent with no indications the 12V is actively charging. The high voltage system now stays energized during the 12-minute post-shutdown period. After 12 minutes have elapsed, you will hear two successive clunks, which are the main high voltage contactors in the HVBJB opening.
This update will also be beneficial if you drive many short trips (<10 minutes), because you will have additional 12V charging time after shutdown. This will help keep the 12V battery charged up, and covers the load of headlights, screens, and opening/closing doors during the post-shutdown period. Before, all those accessories would drain the 12V battery by about 5-10% after each shutdown.
One important service change—if you are replacing the 12V battery from now on, you will now need to wait at least 12 minutes after the vehicle is shut down before removing the battery terminals. The charging system will remain powered up (and may be silent). The same is true if you are removing a terminal to do a 12V reset. If you don't wait 12+ minutes, you could short out the DC/DC converter or blow a mega fuse if the positive cable touches ground, even after removing the negative terminal. Terminal voltage should be less than 13V before removal.
- The charging system will maintain 14.5V for 12 minutes after vehicle shutdown.
- If the 12V battery were to fail while driving, the DC/DC converter will continue to provide power to the door latches through the 12-minute post-shutdown period, allowing unlock and entry/exit.
After the update, you may notice the slight hum of a cooling pump running after driving and parking the car (if it's warm outside). This is normal, it is cooling the DC/DC converter producing the 12V power. If it's cool outside, the vehicle will be silent with no indications the 12V is actively charging. The high voltage system now stays energized during the 12-minute post-shutdown period. After 12 minutes have elapsed, you will hear two successive clunks, which are the main high voltage contactors in the HVBJB opening.
This update will also be beneficial if you drive many short trips (<10 minutes), because you will have additional 12V charging time after shutdown. This will help keep the 12V battery charged up, and covers the load of headlights, screens, and opening/closing doors during the post-shutdown period. Before, all those accessories would drain the 12V battery by about 5-10% after each shutdown.
One important service change—if you are replacing the 12V battery from now on, you will now need to wait at least 12 minutes after the vehicle is shut down before removing the battery terminals. The charging system will remain powered up (and may be silent). The same is true if you are removing a terminal to do a 12V reset. If you don't wait 12+ minutes, you could short out the DC/DC converter or blow a mega fuse if the positive cable touches ground, even after removing the negative terminal. Terminal voltage should be less than 13V before removal.
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