When does the battery need to be replaced in our keys? Also, is this done as a part of service?

For some reason I thought I read two years but am not sure...

 

it depends on use, when you start to loose range or if you have to press the unlock button very close to the door.

i don't think they do it as part of the service, coz' it could be very random

 

Yes, it is DIY based on what I remember, although it can be years before it needs replacing. Also supposedly storing the key fobs next to each other can drain the battery.

 

On my RX350 it was a little over a year

and I don't really think it needed replacing.

I just replaced it as a precautionary step.

 

I have to do it also on my RX. Did you take it in or do it yourself? If you did it yourself, where does the battery go in the RX key?

 

On the RX, you unscrew the screw on the key, and remove the cover. Inside is the key module, you slide the lithium battery out of the key module and slide the new one in IIRC.

On the LS, you remove the mechanical key and also remove the cover, with a similar module inside but the battery is lying flat, you remove and replace each. The manual has more detailed instructions, I would be very careful...but the battery life is around 1-2 years at least, and in my experience with moderate regular use it can last quite a while.

 

The battery life will be greatly shortened if you leave the fob in the car with the ignition off for long periods of time. The transponder will be continually addressing the fob and vice versa, which uses up the battery power.

 

My dealer replaces the battery every six months. It may not need it, but if I remember correctly the charge is minimal and it falls under that better safe than sorry category.

 

Is there a DIY write-up out there?

No success on a search.

 

A lot has been said about the key battery.

Here are some links that might be helpful:

https://www.clublexus.com/forums/ls4...y-battery.html

https://www.clublexus.com/forums/ls4...-question.html

https://www.clublexus.com/forums/ls4...placement.html

 

Thanks, brother!

 

I got five (5) batteries on Amazon for $6.29 including free shipping.

 

I just had mine replaced after a year. Cost was $8 and the guy at the parts counter replaced it for free. As was mentioned before, pull the metal key out and use it to open the case. Battery is flat on a circuit board. I plan on a yearly replacement as long as I have the car.
Steve

 

$8 doesn't sound like 'free' around these parts.

 

Any LS460 part that only costs $8 with no labor charge at a Lexus dealer is awfully close to "free".
Steve