Interior lights not coming on when entering

[ZABSMAV]

Okay here is what worked for me. I have a 24 XL Hybrid. Same issue, interior lights not coming on when I opened the door. I went to the dealer with the problem, they said they never heard of this problem (no surprise there). They wanted me to leave it for a "full diagnostic". I wouldn't be able to wait they'd need it overnight. I asked if disabling all connectivity settings might help. The service guy said "no way". I then had a suspicion that this was the answer. I tested the battery, it was fine.
I disabled all the infotainment screen connectivity settings. I reset the BMS (very simple) and now all is perfect. I really didn't want or use their connectivity stuff so no problem disabling these useless things. Try this and use your car for transportation and not as a mobile pc. You may be pleasantly surprised.

You do not want to do the BMS update unless you have fully charged the battery. Otherwise it will learn the state of charge it currently happens to be at and "think" that State of Charge level is a full charge. You should attach a charger to the charge points under the hood, and watch the charger until it shows 100%. It is only at that point that you should do the BMS update with the flashing of the headlights etc. as per the manual. Then leaving the vehicle off and locked for more than 8 hours.

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[JasonDroninAround]

My Tremor still has the old school toggle switch up by the dome light. Center is automatic dome light, one way is always on, and the other way is always off. Hopefully, maybe, you are overlooking something simple like that switch?

 

[Ranger 87]

You do not want to do the BMS update unless you have fully charged the battery. Otherwise it will learn the state of charge it currently happens to be at and "think" that State of Charge level is a full charge. You should attach a charger to the charge points under the hood, and watch the charger until it shows 100%. It is only at that point that you should do the BMS update with the flashing of the headlights etc. as per the manual. Then leaving the vehicle off and locked for more than 8 hours.

My Maverick hybrid started doing the same thing with the interior lights not coming on when I opened the door. I took it to the dealer left it for a couple of days. They said everything was operating normally. So now what?

 

[ZABSMAV]

My Maverick hybrid started doing the same thing with the interior lights not coming on when I opened the door. I took it to the dealer left it for a couple of days. They said everything was operating normally. So now what?

Tell your dealer to replace the battery under warranty. If you're getting deep sleep the battery is already damaged and will soon completely fail leaving you stranded somewhere. Don't take no for an answer. If they give any guf,tell them you want to talk to the general manager, not some penny pinching service writer.

 

[Kenv24]

My Tremor still has the old school toggle switch up by the dome light. Center is automatic dome light, one way is always on, and the other way is always off. Hopefully, maybe, you are overlooking something simple like that switch?

I believe all of the Mav trims have the same type of toggle switch up there. Takes about 5 seconds to figure out what position it's in...if you didn't read the manual.

 

[Ranger 87]

Tell your dealer to replace the battery under warranty. If you're getting deep sleep the battery is already damaged and will soon completely fail leaving you stranded somewhere. Don't take no for an answer. If they give any guf,tell them you want to talk to the general manager, not some penny pinching service writer.

 

[Ranger 87]

I did exactly what you suggested and it worked. I took my Maverick to a different dealership than the first time. They tested the battery, found it wouldn't take a charge and replaced it with an AGM battery under warranty. Thanks.

 

[ZABSMAV]

I did exactly what you suggested and it worked. I took my Maverick to a different dealership than the first time. They tested the battery, found it wouldn't take a charge and replaced it with an AGM battery under warranty. Thanks.

Hopefully they did a battery reset after fully charging the AGM. This will help but the solution was to set the maximum state of charge to 100% as Ford set it at the factory to only 85% because they were shipping the Maverick with FLA type batteries that are temperamental when potentially overcharged.

 

[HeyBales]

I did exactly what you suggested and it worked. I took my Maverick to a different dealership than the first time. They tested the battery, found it wouldn't take a charge and replaced it with an AGM battery under warranty. Thanks.

Did you follow rest of the instructions in the manual?
Because they did not.

Many people garage park the truck so don't lock it overnight ever.

And if you have a charger - even better to charge it up before overnight, do the reset, and let it relearn locked up.

 

[Old Sweet]

Well, see what volts your battery is at, if low then charge, worth a try instead of just going out and buying a new battery, mine was 12.3 volts, a 2025 with no issues, charged over nite, now it is staying right at 12.8 12.9...I do not know why...if your battery is low that is not good for the battery...Your choice, good luck
[/QUOTE

I'll take a meter to it today but damn I may need a new batter in a 2024?

Ford just replace the 12v battery in my '24 with an AGM. This is the second battery under warranty. The first a year ago was non AGM.

 

[gzebrick]

I confirmed this with a Ford engineer a while back who actually volunteered this when I mentioned that sometimes, if it's been a few days when I've not used the Maverick, when I open the doors, the interior lights don't turn on. I keep the truck on a battery tender in my garage so it's got NOTHING to do with the battery voltages.

It's the way FORD engineered a short-cut by making a timed "battery saver" function. It does NOT look at the battery voltage! If you don't operate the truck for about 100 hours, FORD FIRST times-out just some of the electronics, including the module that controls the interior lights. When this happens, your lights won't go on when you open the doors.

This occurs automatically yet does not generate the battery-saver message. That comes some time later (and also disables the remote start). After some additional period of time, the
battery saver function continues to the next step where it disables even more modules including the remote start. That's when you get the message.

These steps are based on TIME. Even with a battery tender in place 24/7 and full 12v+ battery voltage available, the truck still goes into a COMA. It's NOT a bug. It's a feature.

I've complained to FORD directly. Seems like they're not interested in making the battery saver actually LOOK at the battery. Even the Ford engineer I spoke with said it sucked (happens on his vehicle too!)

 

[HeyBales]

I confirmed this with a Ford engineer a while back who actually volunteered this when I mentioned that sometimes, if it's been a few days when I've not used the Maverick, when I open the doors, the interior lights don't turn on. I keep the truck on a battery tender in my garage so it's got NOTHING to do with the battery voltages.

It's the way FORD engineered a short-cut by making a timed "battery saver" function. It does NOT look at the battery voltage! If you don't operate the truck for about 100 hours, FORD FIRST times-out just some of the electronics, including the module that controls the interior lights. When this happens, your lights won't go on when you open the doors.

This occurs automatically yet does not generate the battery-saver message. That comes some time later (and also disables the remote start). After some additional period of time, the
battery saver function continues to the next step where it disables even more modules including the remote start. That's when you get the message.

These steps are based on TIME. Even with a battery tender in place 24/7 and full 12v+ battery voltage available, the truck still goes into a COMA. It's NOT a bug. It's a feature.

I've complained to FORD directly. Seems like they're not interested in making the battery saver actually LOOK at the battery. Even the Ford engineer I spoke with said it sucked (happens on his vehicle too!)

Yes, there have been some threads on that change to the 25MY last year.

Not just voltage, but time since last running.

Which makes sense - someone could be in and out of their truck, lights on max time each time they close the door. Truck doesn't know how many days until you plan to start it, so battery can charge.
Why wait until it reaches 12.1 V if it can just stop doing the lights and causing it get down there.
Same way the Deep Sleep Mode would disable the modem with 14 days of no turn on.
Modem is a rather wimpy draw (but things could go haywire of course) - but turns it off since it has no clue how much longer it'll be.

Which means there is probably a Forscan setting now to stop that 25/26MY limit from kicking in.

 

[gzebrick]

Yes, there have been some threads on that change to the 25MY last year.

Not just voltage, but time since last running.

Which makes sense - someone could be in and out of their truck, lights on max time each time they close the door. Truck doesn't know how many days until you plan to start it, so battery can charge.
Why wait until it reaches 12.1 V if it can just stop doing the lights and causing it get down there.
Same way the Deep Sleep Mode would disable the modem with 14 days of no turn on.
Modem is a rather wimpy draw (but things could go haywire of course) - but turns it off since it has no clue how much longer it'll be.

Which means there is probably a Forscan setting now to stop that 25/26MY limit from kicking in.

IIMHO, I can't agree with the idea that turning off modules based on time is a valid approach. It doesn't take into account battery tenders. The battery saver really should just look at the state of charge only.

If you find a parameter to disable this feature (or set the time limit to something like 999,999 hours) that would be great but I know of no way to do that. Thanks

 

[Chops]

Yes, there have been some threads on that change to the 25MY last year.

Not just voltage, but time since last running.

Exactly - the interior lights on my 25 EB will not turn on upon entry if my truck has sat for a couple or so days. Just the algorithm - my battery is fine. Happens once a week at least. Of course there could be other issues related to the Hybrid interior lights that don’t affect me - but the “auto disable” of the interior lights based on sitting does.

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