3 Issues - Need Some Help
#31
All reputable battery replacement service centers will apply voltage in parallel with the car's battery so all electrically operated devices (e.g. clocks) and the car's electronics that have memory chips (that may not retain memory with a loss of voltage) will always remain powered-up. Most of today's memory chips do retain their memory with loss of power, unlike years ago. However...
To try to answer your question as best I can; I am unaware of anything, with the possible exception of the analog dash clock, that may need to be reset if power (voltage) is momentary lost. That said, it is my understanding that most vehicle's ECU is purposely designed to lose its memory after being powered-down for an extended period of time (say 30 minutes or more) so it will purposely automatically reset itself. To my knowledge most items like seat memory settings, AC control settings, radio, etc. would not lose their memory nowadays if power is briefly removed like when replacing a battery. However, it is always best to keep the car's electrical system powered-up when replacing the battery so there is no problem.
It should be noted that some vehicles are more prone to have issues with the engine's throttle body operation after the ECU resets from lack of voltage for a while, where the throttle body must be cleaned - otherwise the engine might not start, or if it does start the engine will likely idle and perform poorly compared to how it performed prior to voltage being removed.
Rarely will jump starting cause the types of issues mentioned above...unless the vehicle's battery was completely dead.
To try to answer your question as best I can; I am unaware of anything, with the possible exception of the analog dash clock, that may need to be reset if power (voltage) is momentary lost. That said, it is my understanding that most vehicle's ECU is purposely designed to lose its memory after being powered-down for an extended period of time (say 30 minutes or more) so it will purposely automatically reset itself. To my knowledge most items like seat memory settings, AC control settings, radio, etc. would not lose their memory nowadays if power is briefly removed like when replacing a battery. However, it is always best to keep the car's electrical system powered-up when replacing the battery so there is no problem.
It should be noted that some vehicles are more prone to have issues with the engine's throttle body operation after the ECU resets from lack of voltage for a while, where the throttle body must be cleaned - otherwise the engine might not start, or if it does start the engine will likely idle and perform poorly compared to how it performed prior to voltage being removed.
Rarely will jump starting cause the types of issues mentioned above...unless the vehicle's battery was completely dead.
-Mike
#32
Lexus Test Driver
Thanks. Reason I ask is by the time I have to replace my OEM battery in a couple years, I'll end up doing it myself, just was wondering if there were any caveats to watch out for. I know on another thread here some dude had to reprogram his window switches, but this was pretty simple, just lower and raise each window from the drivers console and they "relearn".
-Mike
-Mike
I'd let whoever you buy the new battery from install it for you and dispose of the old one. If you choose a proper provider they'll keep voltage on the car's system as they replace the old battery with the new one and you're guaranteed of not having any issues.
#33
Pole Position
Thread Starter
I've got to say that I have never had anyone install a battery for me. I am not paying for such a simple job that a monkey could do with a 10mm wrench. My $.02
Also, update on my issue. The 3rd zone climate control does not work at all. No air on feet or face. Some servo clicking behind the dashboard like the servo is trying to fire but nothing. Just one small click.
Also, update on my issue. The 3rd zone climate control does not work at all. No air on feet or face. Some servo clicking behind the dashboard like the servo is trying to fire but nothing. Just one small click.
#34
Pole Position
Thread Starter
So I had my battery tested today as I suspected a problem with it and we are coming into winter. The batter was reading low voltage to I had it replaced. It is a PITA to replace yourself as I helped the Auto Zone guy replace it.
Good news is that it didnt affect any of my settings except for the clock.
Bad news is that it did not fix my Climate Control problem.
Are there any resets I should perform that I am missing other than windows and roof?
Thanks
Good news is that it didnt affect any of my settings except for the clock.
Bad news is that it did not fix my Climate Control problem.
Are there any resets I should perform that I am missing other than windows and roof?
Thanks
#35
Lexus Test Driver
#36
Lexus Test Driver
► Servo Motor/Gear Clicking Noise
Last edited by bclexus; 11-15-17 at 01:56 PM.
#37
Pole Position
Thread Starter
Lol!! It was free install so I took it. I surpervised though
Okay. I hooked up my Carista today and pulled quite a few codes. Mostly all the AC Servo faults and an AC Amplifier fault. i posted that service bulletin earlier in the thread here and I believe that will be the issue. $450 part.
You better hope one of the AC system damper door's servo motor/gear assembly doesn't need replacing...oftentimes it means pulling off major pieces of the dash to get to the servo assembly. The clicking noise is what it sounds like when the servo gear is stripped or has teeth missing. It is very likely that the AC 75° reset issue and the damper door servo assembly are connected.
► Servo Motor/Gear Clicking Noise
► Servo Motor/Gear Clicking Noise
#38
Pole Position
Thread Starter
i also had a problem where it was blowing a ton of cold air in my face even in heat mode and that is fixed as well.
If im a logical man, it seems like the battery’s low voltage knocked out some of the AC servos and Amplifier and then stayed knocked out until I cleared the codes and they tried again. Now they are getting proper voltage and working again.
Geez the woes of technology in cars.
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twylie (11-16-17)
#39
Advanced
iTrader: (3)
Quoting myself on this one. Got in my car this morning after clearing all those AC fault codes and replacing the battery and now the rear climate control works!
i also had a problem where it was blowing a ton of cold air in my face even in heat mode and that is fixed as well.
If im a logical man, it seems like the battery’s low voltage knocked out some of the AC servos and Amplifier and then stayed knocked out until I cleared the codes and they tried again. Now they are getting proper voltage and working again.
Geez the woes of technology in cars.
i also had a problem where it was blowing a ton of cold air in my face even in heat mode and that is fixed as well.
If im a logical man, it seems like the battery’s low voltage knocked out some of the AC servos and Amplifier and then stayed knocked out until I cleared the codes and they tried again. Now they are getting proper voltage and working again.
Geez the woes of technology in cars.
#40
Pole Position
Thread Starter
Thanks. Frustrating as hell and I would never have thought that just clearing the codes would have worked. Especially because there was no check engine light and nothing indicating there were faults. I scanned it out of curiosity and fixed it! Sometimes curiosity saves the cat some money lol
#41
Lexus Test Driver
Quoting myself on this one. Got in my car this morning after clearing all those AC fault codes and replacing the battery and now the rear climate control works!
i also had a problem where it was blowing a ton of cold air in my face even in heat mode and that is fixed as well.
If im a logical man, it seems like the battery’s low voltage knocked out some of the AC servos and Amplifier and then stayed knocked out until I cleared the codes and they tried again. Now they are getting proper voltage and working again.
Geez the woes of technology in cars.
i also had a problem where it was blowing a ton of cold air in my face even in heat mode and that is fixed as well.
If im a logical man, it seems like the battery’s low voltage knocked out some of the AC servos and Amplifier and then stayed knocked out until I cleared the codes and they tried again. Now they are getting proper voltage and working again.
Geez the woes of technology in cars.
Thanks. Frustrating as hell and I would never have thought that just clearing the codes would have worked. Especially because there was no check engine light and nothing indicating there were faults. I scanned it out of curiosity and fixed it! Sometimes curiosity saves the cat some money lol
Is there anything in the Lexus service history for this car that may offer a clue about what happened?
#42
Pole Position
Thread Starter
I'm curious 'why' the car had so many AC system related codes too. Just a weak battery should not have caused problems with the AC system where codes are thrown and the system goes into a safe mode. I don't doubt that clearing the codes brought the AC system back to a fresh reset, but I suspect there is more to the story that explains what really happened - that doesn't have anything to do with a weak battery in my opinion... I hope it remains working as it should...
Is there anything in the Lexus service history for this car that may offer a clue about what happened?
Is there anything in the Lexus service history for this car that may offer a clue about what happened?
service history is clean. Car was garage kept and never driven (which might have caused more issues than not)
im hoping the system is all set now as even when I started the car today the system booted and remembered my settings. So alls well that ends well? Lol
Last edited by OneFunGS; 11-16-17 at 03:32 PM.
#43
Lexus Test Driver
I'm curious 'why' the car had so many AC system related codes too. Just a weak battery should not have caused problems with the AC system where codes are thrown and the system goes into a safe mode. I don't doubt that clearing the codes brought the AC system back to a fresh reset, but I suspect there is more to the story that explains what really happened - that doesn't have anything to do with a weak battery in my opinion... I hope it remains working as it should...
Is there anything in the Lexus service history for this car that may offer a clue about what happened?
Is there anything in the Lexus service history for this car that may offer a clue about what happened?
Thanks. It is interesting. I’m thinking the low voltage and the 3 zone, 2 blower system in the luxury package has something to do with the system going into safe mode. That and a loose ground I found a few days ago on a fuse box (I lost turn signals and went hunting)
service history is clean. Car was garage kept and never driven (which might have caused more issues than not)
im hoping the system is all set now as even when I started the car today the system booted and remembered my settings. So alls well that ends well? Lol
service history is clean. Car was garage kept and never driven (which might have caused more issues than not)
im hoping the system is all set now as even when I started the car today the system booted and remembered my settings. So alls well that ends well? Lol
Last edited by bclexus; 11-16-17 at 04:26 PM.
#44
Pole Position
Thread Starter
That loose ground was my fault. Was dickin with the fuses and fuse boxes to try and fix the AC and probably loosened it up since it was the box I was messing with most. No biggie. 10mm and it was back on.
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