I bought Rx450h 2010 model few weeks ago and the keyfob all of a sudden started malfunctioning. Sometimes it opens the doors and sometimes it doesn’t. Any time it doesn’t open the doors AFS light and ABS light will be on. I have changed the battery 4 times but I didn’t fix the problem. I took the fob to auto smith technician, he run some diagnosing on the fob and said the fob is working properly that I should take the car to dealership which i did and few days later it started again. Have anyone experienced this issue before?

 

Sounds like an issue inside the vehicle, not the fob. Any furry little buddies been snacking on wires?

 

When ever you have 2 of an item, one should test with the other. Place the suspect key-Fob far away and see if the second key-Fob makes the problem go away.

Other than critters, I would be concerned about 'clean prior history'. unexplained random problems are hard to trace. Can you return the vehicle or have the seller fix the problem

Salim

 

I bought the car for auction. This is what the dealership is suggesting.

 

12 volt battery has been known to cause all sorts of mysterious problems on the hybrid, sounds like your loose battery connections may of been the source.

 

Another thing I notice is that anytime the fob fails to open the door the roof lights will all be off, The fog lights won’t on, Some rear lights won’t turn on.

 

What do you suggest I should do? Get another keyfob since the car has just one keyfob. Or replace the 12v battery?

 

I only recommend evidence based diagnoses.
2nd FOB: You need to be sure you want to keep the vehicle as it is a financial decision. Personally I say 2nd key is a MUST. Have it programmed as a Master.

12V battery: I assume the loose terminal was the 12v battery. That has been addressed. Being an auction vehicle, it might have sat and drained the battery low. Charge it overnight and have it tested under load [any auto store can do it for you for free].

See if the problem goes away as suggested by the dealer. If problem persists .. then let's revisit armed with new evidence.

Salim

PS: Was the vehicle ever exposed to rising or excessive falling water? First gen had the fuse panel near the left knee of the driver.

 

I will go ahead and order another keyfob online and let locksmith technician program it for me cause if cheaper than dealer. Do you know any website that I can get a good deal on the fob?

 

My Rx450h 2102 keyfob doesn’t work sometimes. I took the car to Lexus dealership and the said the error code on the dashboard is as result of low power and the remove the terminals and clean up the battery and replace the terminals and calibrate the car everything started working properly. But the recommended that I should get another keyfob is problem reoccurs again. After two days the problem started all over again. I went and purchased another aftermarket keyboard and contacted locksmith technician around me. He came but his machine couldn’t communicate with the car. And I called the dealership they told me they can’t touch the keyfob because is aftermarket. Any solution?

 

They cleaned up the 12volt battery? Has it been actually tested?

Many on here have had numerous starting issues resolved by replacing the 12 volt battery with a new one.

Being a 2012 I wouldn’t be surprised if it’s the original. At the very least, have it load tested properly and replace if needed before chasing down other issues.

 

They dealership tested the 12v battery and said it ok. That They can’t see anything wrong but if it occurs again I should get another keyfob which i did after it started again but i don’t really know why the locksmith technician programming machine was unable to communicate with the car and dealership can’t program it because it’s aftermarket.

 

Try visiting another locksmith or check with the seller of the key fob.

Salim
PS: Better still, return your purchase and ask the locksmith to procure and program a replacement keyFOB

 

From what I read it seems like no one have tried to just replace the key fob battery and see if that solves the problem. Sometimes key fobs may work sporadically if the battery voltage is too low.

Edit: Never mind; post #1 stated that a battery was changed four times which I assume was the key fob battery. Therefore, it could be a defective key fob transmitter module.

You may need one of these.

 

I had a problem with a set of cheap Amazon key fob batteries lasting less than 2 weeks and causing various problems such as the door touch not always working and warnings of low fob batteries from the vehicle. . After obtaining Duracell batteries no more problems.