New battery & Alternator causing Trans. Failsafe Prog

[mcfee03]

Originally Posted by andrewwynn

Both of my keys suffered a broken solder joint. I reflowed the solder and brought the back to life.

How could I tell it has a broken solder joint?

I've only driven short journeys (total of 12kms)- should the battery charge at all in that time?

Say two period of 14 minutes.

[andrewwynn]

It takes a good amount of driving to charge but takes many months to self drain.

You would have to cut open to determine if the battery is charging and it's tough to determine what contacts may be shot.
My fob is screwed together so I'll probably open up to Repair but I've been planning to replace my lost key before doing this in case I killed the immobilizer chip but I can maybe open to take a photo to show you.


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[Crowz]

On the charging part I ran across this but I have not tested this :

Experiment

I had to figure out the condition under which the key would be charging.

So, I put together a little experiment:


As it turns out, just leaving the key in the ignition (position 0) will charge the battery :


And no difference if key is turned to position 1:


Or, position 2:


So, if you're going to charge your spare key battery, just leave it in the ignition and make sure to have your car on the battery maintainer.

Cheers!

[andrewwynn]

That's awesome feedback!


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[upallnight]

I use a wireless toothbrush charger to charge my keys. It seems to be working since the battery is never dead.

[andrewwynn]

I'm not sure the frequency used for the keys. The technology is the same but if may not be very effective. That said. You can leave 24/7 on the tooth brush charger. I am curious now


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[Crowz]

I ran across several people saying that leaving the key on the toothbrush charger fried the key eventually. I have NO CLUE if that is right or not just passing on what I read.

[upallnight]

Originally Posted by Crowz

I ran across several people saying that leaving the key on the toothbrush charger fried the key eventually. I have NO CLUE if that is right or not just passing on what I read.

I have been using the wireless toothbrush charger for the past three years and none of my FOB are fried or dead. Which toothbrush charger were they using?

[Crowz]

Originally Posted by upallnight

I have been using the wireless toothbrush charger for the past three years and none of my FOB are fried or dead. Which toothbrush charger were they using?

I don't remember but I will try to find the posts again and see.

It was a long drawn out argument thread about it.

[andrewwynn]

They did not hurt a key fob from constant charging. The fob likely coincidentally just had a short joint failure.

It's not great to trickle charge any modern chemistry battery so I wouldn't leave them charging for days. If the frequency is compatible it would work for sure.


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