2024 NX 450h: Dead as a door knob
06-20-24, 03:06 PM
#107
Thanks for the reply.
I don't know! That's why I put it in my post. I see both possible scenarios and am wondering if one is "right."
Since my incident yesterday, it's now locked. However it is our habit, and I think many (most?) others to leave a car unlocked in the garage. I think it's safer unlocked, as well.
I don't know! That's why I put it in my post. I see both possible scenarios and am wondering if one is "right."
Since my incident yesterday, it's now locked. However it is our habit, and I think many (most?) others to leave a car unlocked in the garage. I think it's safer unlocked, as well.
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Sallywelsh (06-20-24)
06-20-24, 04:18 PM
#108
Thanks for your response. I like that you have the monitoring data from which to draw your conclusions. Based on those, would you say that if my trip to an airport is 2 to 3 hours and the NX will be parked there 2 weeks that I could park in ready mode and let it charge until the 1 hr auto shutdown? Then maybe try to do a remote start from the app mid-trip?
Thanks, again.
Thanks, again.
06-20-24, 04:40 PM
#109
Thanks for your response. I like that you have the monitoring data from which to draw your conclusions. Based on those, would you say that if my trip to an airport is 2 to 3 hours and the NX will be parked there 2 weeks that I could park in ready mode and let it charge until the 1 hr auto shutdown? Then maybe try to do a remote start from the app mid-trip?
Thanks, again.
Thanks, again.
06-20-24, 05:20 PM
#110
Intermediate
In case you folks haven't tried these already, please take a look at things the RX hybrid owners did to get some level of mitigation of their battery problems. These are very long threads, but I'm pointing out a specific post.
Personally, I have swtiched off the Drive Stats portion of the app and kept all the other functions on now - but if someone is keeping car unlocked or keeping windows open, it likely makes sense to switch off all the data alerts from the car to Lexus server/apps - so as to minimize continuous wake-up and lose charge scenario of the 12V. My car has also survived a 26 day trip when I was away from home with the key fob, likely because it doesn't have any other problem (such as DC-DC inverter or DCM module parasitic drain etc) other than the dismal charging algorithm plaguing all RX and NX hybrids in general. During that trip, I meant to do remote start, but did not know you can't do it after 7 days and also that one can't do it more than twice in succession. After getting back, the car ran for 1 week, until the temperature dipped to 4 C and had to be jump-started then.
Personally, I have swtiched off the Drive Stats portion of the app and kept all the other functions on now - but if someone is keeping car unlocked or keeping windows open, it likely makes sense to switch off all the data alerts from the car to Lexus server/apps - so as to minimize continuous wake-up and lose charge scenario of the 12V. My car has also survived a 26 day trip when I was away from home with the key fob, likely because it doesn't have any other problem (such as DC-DC inverter or DCM module parasitic drain etc) other than the dismal charging algorithm plaguing all RX and NX hybrids in general. During that trip, I meant to do remote start, but did not know you can't do it after 7 days and also that one can't do it more than twice in succession. After getting back, the car ran for 1 week, until the temperature dipped to 4 C and had to be jump-started then.
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Sallywelsh (07-11-24)
06-20-24, 06:50 PM
#111
Not sure if it was a “Recommendation” vs more that she was just trying to problem solve other ways to possibly mitigate the drain. I interpreted as a safety guard rail to help keep us more in check. 🤷🏻♂️ I didn’t even know that option even existed.
06-21-24, 02:54 AM
#112
Thanks NX450Guy. Your info is encouraging.
When you say "I still drive short hops, and occasionally not for three weeks at a time, with no problems." My biggest concern right now is that we have an overseas trip coming up and the NX will be at a long-term airport parting lot for about 2 weeks. Would you use the same approach in such a situation.
Other things I don't understand are:
Also, the dealer didn't mention short trips, or driving mostly in EV mode as being something that requires additional attention and nobody at the dealership has said anything like..."Don't use ACC mode!" Those of us that are old enough to remember regularly using ACC mode to listen to music and neck certainly should be warned not to.
Sorry if I'm ranting. But this whole thing seems so wrong for a highly computerized luxury vehicle. Our 10-year old Nissan Leaf AUTOMATICALLY boosts the 12v battery from the traction battery and could sit for months just fine. No user intervention required (just like my wife likes). NEVER got stranded and NEVER had to call roadside service.
When you say "I still drive short hops, and occasionally not for three weeks at a time, with no problems." My biggest concern right now is that we have an overseas trip coming up and the NX will be at a long-term airport parting lot for about 2 weeks. Would you use the same approach in such a situation.
Other things I don't understand are:
- I've heard that the car will "go to sleep" faster if it's locked, rather than unlocked. What is this all about? Do you lock your car in your garage?
- Does having a window open (e.g., to pass a charger cord through) drain the battery? (Does the car keep trying to alert me of that and drain the 12v?)
- Does having the car plugged in (i.e., before/after a scheduled charge) deplete the battery?
- Is there any way the car displays the 12v to alert to so many other things that a "pre-death" low battery alert should be on the list.)
- Can the 12v battery be trickle charged by connecting to the jump terminal at the fuse box under the hood? Does having the hood up/open during this process defeat the purpose by also draining the battery to tell me the hood's open?
Also, the dealer didn't mention short trips, or driving mostly in EV mode as being something that requires additional attention and nobody at the dealership has said anything like..."Don't use ACC mode!" Those of us that are old enough to remember regularly using ACC mode to listen to music and neck certainly should be warned not to.
Sorry if I'm ranting. But this whole thing seems so wrong for a highly computerized luxury vehicle. Our 10-year old Nissan Leaf AUTOMATICALLY boosts the 12v battery from the traction battery and could sit for months just fine. No user intervention required (just like my wife likes). NEVER got stranded and NEVER had to call roadside service.
Haven’t had a problem with the 12 v after leaving it parked for two weeks.
Is there any way the car displays the 12v to alert to so many other things that a "pre-death" low battery alert should be on the list.)
This would be so helpful, but no, unfortunately. Makes no sense with everything else it monitors.
Also, the dealer didn't mention short trips, or driving mostly in EV mode as being something that requires additional attention and nobody at the dealership has said anything like..."Don't use ACC mode!" Those of us that are old enough to remember regularly using ACC mode to listen to music and neck certainly should be warned not to.
Driving mostly in EV mode doesn’t see to be the issue. It’s a matter of did you drive long enough to let the 12 v charge. If you use a lot of juice for ACor heat or something, it may need longer to charge. That’s why sitting in ready mode with few things one will charge it up faster.
Yes, ACC used to be useful. Now it’s something you need to avoid. It will drain the 12v fast.
like you said, frustrating that a vehicle this expensive needs to be babysat.
A forum member has a YouTube page you will find helpful in answering your other questions:
https://m.youtube.com/@lsft
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Sallywelsh (07-11-24)
06-21-24, 08:19 AM
#113
Intermediate
In case you folks haven't tried these already, please take a look at things the RX hybrid owners did to get some level of mitigation of their battery problems. These are very long threads, but I'm pointing out a specific post.
Personally, I have swtiched off the Drive Stats portion of the app and kept all the other functions on now - but if someone is keeping car unlocked or keeping windows open, it likely makes sense to switch off all the data alerts from the car to Lexus server/apps - so as to minimize continuous wake-up and lose charge scenario of the 12V. My car has also survived a 26 day trip when I was away from home with the key fob, likely because it doesn't have any other problem (such as DC-DC inverter or DCM module parasitic drain etc) other than the dismal charging algorithm plaguing all RX and NX hybrids in general. During that trip, I meant to do remote start, but did not know you can't do it after 7 days and also that one can't do it more than twice in succession. After getting back, the car ran for 1 week, until the temperature dipped to 4 C and had to be jump-started then.
Personally, I have swtiched off the Drive Stats portion of the app and kept all the other functions on now - but if someone is keeping car unlocked or keeping windows open, it likely makes sense to switch off all the data alerts from the car to Lexus server/apps - so as to minimize continuous wake-up and lose charge scenario of the 12V. My car has also survived a 26 day trip when I was away from home with the key fob, likely because it doesn't have any other problem (such as DC-DC inverter or DCM module parasitic drain etc) other than the dismal charging algorithm plaguing all RX and NX hybrids in general. During that trip, I meant to do remote start, but did not know you can't do it after 7 days and also that one can't do it more than twice in succession. After getting back, the car ran for 1 week, until the temperature dipped to 4 C and had to be jump-started then.
I’ve been on a campaign to preserve battery charge, i.e., minimize current flow when the vehicle is turned off. I had over 300 mA (0.3 A) of “dark current” before doing anything; that was draining the battery every couple of days. The following steps helped:
1. Turn off the Digital Key system on the vehicle (this was the biggie—most of the current draw in my case):
Settings -> Info & Security -> Enable digital keys -> OFF
2. Have the radio, display, etc. turn off immediately when the car is turned off:
Settings -> Vehicle customize -> Utility -> ACC customize -> ON
3. Have the lights turn off ASAP when vehicle turns off:
Settings -> Vehicle customize -> Lights -> Exterior lights: Auto off timer -> 7.5 seconds
Settings -> Vehicle customize -> Lights -> Interior lights: Auto off timer -> 7.5 seconds
4. Turn off all Push notifications in the Lexus App. This is what sends messages to your phone that something is in your back seat, doors are unlocked, etc.
5. Turning off the dome light above rear-view mirror (ok, this is excessive!)
Doing these things reduced my parasitic current to 28 mA (0.028 A) as measured by the Lexus dealer; they said this was the low end of the “dark current” spec and should be fine. And yet, with our normal driving (30 - 45 minutes per day) we could not keep the battery charged (see first figure below). My battery monitor said I was between 0 and 30% charged every day.
1. Turn off the Digital Key system on the vehicle (this was the biggie—most of the current draw in my case):
Settings -> Info & Security -> Enable digital keys -> OFF
2. Have the radio, display, etc. turn off immediately when the car is turned off:
Settings -> Vehicle customize -> Utility -> ACC customize -> ON
3. Have the lights turn off ASAP when vehicle turns off:
Settings -> Vehicle customize -> Lights -> Exterior lights: Auto off timer -> 7.5 seconds
Settings -> Vehicle customize -> Lights -> Interior lights: Auto off timer -> 7.5 seconds
4. Turn off all Push notifications in the Lexus App. This is what sends messages to your phone that something is in your back seat, doors are unlocked, etc.
5. Turning off the dome light above rear-view mirror (ok, this is excessive!)
Doing these things reduced my parasitic current to 28 mA (0.028 A) as measured by the Lexus dealer; they said this was the low end of the “dark current” spec and should be fine. And yet, with our normal driving (30 - 45 minutes per day) we could not keep the battery charged (see first figure below). My battery monitor said I was between 0 and 30% charged every day.
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Sallywelsh (07-11-24)
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