Sign in to follow this  
poppop1000

Avensis remote key works bad.

Recommended Posts

Hi everyone!
My Avensis 08 sedan remote key works like this: Everything works normally in two days. After that Battery dies. Tried to switch batteries four times. Tried to put precision cleaner for electronics. Tried to took off rubber buttons. Why the Battery dies after two days?

 

DSC_0272.JPG

Share this post


Link to post
Share on other sites

Our you certain the Battery is being drained or is it simply the act of removing and refitting a Battery that gets it working again ?

The sprung contact under the Battery is know to be troublesome. The fix is to remove it carefully (pry it out) and to retention it. Refitting it back is the reverse of removal. It can also be helpful to clean the pads on the circuit board that this connector contacts using isopropyl alcohol or similar.

Share this post


Link to post
Share on other sites

Can you show me how to do it? Remove the sprung?

Share this post


Link to post
Share on other sites

This image is from the web but shows the spring contact. In this version the spring can be removed completely by carefully prising it upward. The contacts can then be gently bent to tension them more. There are a couple of contacts that touch the circuit board and the other contact the Battery. The contacts that touch the board are at the 12:00 and 19:00 positions. 

 

 

Annotation 2019-04-04 144135.jpg

Share this post


Link to post
Share on other sites

Done. Now we have to wait two days.

Share this post


Link to post
Share on other sites

Fingers crossed then 😉

Share this post


Link to post
Share on other sites

And the Battery is empty. 😭
What is the plan B?

 

Share this post


Link to post
Share on other sites

My plan B would be to now test that Battery and make sure it really has been discharged by the remote. Ideally that means checking the voltage under load which is tricky. If you find leaving it out for a while and then refitting the same Battery back causes it to work again then something else is going on. 

If however the Battery has genuinely been flattened by the remote then its not diy repairable I'm afraid, well unless it was something like the case pressing on one of the buttons and it was discharging it that way by it transmitting all the time.  

Share this post


Link to post
Share on other sites

A bit of a long-shot here!  I have accidentally bought counterfeit (branded) button cells a few years back in a similar size to this, they didn't last as long as the genuine item, but their life was not as terrible as your ones.  But, before you condemn the remote, have you tried a different brand or supplier of Battery?  These lithium batteries have a long shelf-life, so age shouldn't be the problem.

Share this post


Link to post
Share on other sites
1 hour ago, Mooly said:

My plan B would be to now test that battery and make sure it really has been discharged by the remote. Ideally that means checking the voltage under load which is tricky. If you find leaving it out for a while and then refitting the same battery back causes it to work again then something else is going on. 

If however the battery has genuinely been flattened by the remote then its not diy repairable I'm afraid, well unless it was something like the case pressing on one of the buttons and it was discharging it that way by it transmitting all the time.  

Tested Battery on voltage tester. Allmost empty. Tested refitting the same Battery. Completely dead. 😭

Share this post


Link to post
Share on other sites
27 minutes ago, Gerg said:

A bit of a long-shot here!  I have accidentally bought counterfeit (branded) button cells a few years back in a similar size to this, they didn't last as long as the genuine item, but their life was not as terrible as your ones.  But, before you condemn the remote, have you tried a different brand or supplier of battery?

Yes. Tried 3 different brand. Made in Japan.

Share this post


Link to post
Share on other sites

So based on all that has been done and tested so far it would appear that the remote is discharging the Battery itself. Thats pretty much game over on a diy level.

Disclaimer... what follows next is something I would try but be aware this may wreck what functionality the remote still has.

Has moisture or any contamination entered the remote at all?

It is possible to wash electronic circuitry like this to clean the circuit board. You would need to remove the board completely from the case and using a little detergent and a soft brush/water gently wash the board. Having done that pat it dry with paper towel tryng to wick as much mosture up from the component side and around the switches. Place on a hot radiator or in the sun for several hours before trying it. Temperatures up 50C wont do any harm at all. 

Post #10 here:

https://www.diyaudio.com/forums/car-audio/301813-washing-amplifier-board-post4942703.html

 

 

 

 

Annotation 2019-04-09 075113.jpg

Share this post


Link to post
Share on other sites

I dont see any moisture or any contamination entered the remote.  Is there any picture how to remove the board completely from the case? Yes i have tried, but no succeed.

On 4/8/2019 at 10:05 PM, Gerg said:

 

Share this post


Link to post
Share on other sites

The board just clips into place. A little gentle prising with a tiny jewellers screwdriver should release it.

Share this post


Link to post
Share on other sites

I took case to local locksmith. They inform me when its ready.
Second question:

If i order new key from ebay, how can I know frequency? Use in Finland. Blade is TOY47. Thats for sure. Case was marked 89071-05010. What about transponder chip?

 

Share this post


Link to post
Share on other sites

Hi.

Do you keep the remote chip/key close to the car? I take it you know if they are close to each other the key fob and car communicate to each other all the time, it's best to store the key fob as far away from the car as you physically can, just a thought. If stored too close to each other the drain on the key fob Battery is much, much quicker, worth a try.

Mike.

Share this post


Link to post
Share on other sites
On 4/11/2019 at 8:28 AM, Mike169 said:

Hi.

Do you keep the remote chip/key close to the car? I take it you know if they are close to each other the key fob and car communicate to each other all the time, it's best to store the key fob as far away from the car as you physically can, just a thought. If stored too close to each other the drain on the key fob battery is much, much quicker, worth a try.

Mike.

No i dont keep key close to the car.

Share this post


Link to post
Share on other sites

Local locksmith said that they cannot see any problem with board. They didnt find the problem... What next??

Share this post


Link to post
Share on other sites

Very little you can do from a diy perspective. Powering the board from an external 3 volt supply and monitoring the current draw would be next. When not actively transmitting the current draw should be essentially zero, certainly less than a couple of microamps.

Share this post


Link to post
Share on other sites

I wouldn't like to say on whether it would be suitable or not. The immobilser chip (thats the unpowered one embeded in the plastic of the key) would need programming to allow it to talk to the cars ECU and allow it to start. The remote locking chip would also need programming to be able to talk to and unlock the doors.

A lot of if's and but's there to me.

 

Share this post


Link to post
Share on other sites

How do I know the correct chip? 4D67 or 4D70?

Share this post


Link to post
Share on other sites

I've no idea on that. The seller of the replacement module is the one to advise on that I'm afraid.

 

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
Sign in to follow this  

  • Club Hybrid Poll

  • 215 Hybrid Reliability

    1. 1. If you were to consider buying a Hybrid model over 5 years old, would you be worried about the reliability of the Hybrid system?


      • Not really as Hybrid systems are always reliable
      • Not if it had a Manufacturers Warranty on the Hybrid system
      • I would not buy a Hybrid model over 5 years old