0Excessive Key Fob Battery Drain
#1
Rennlist Member
Thread Starter
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Has anyone else had their key fob drain batteries in a week or two?
Mine continues to drain the battery even after the button has been released (between 3 and 7 mA).
I think both my key fobs do this, which is more than a simple fluke.
My last battery lasted less than 1 week.
Mine continues to drain the battery even after the button has been released (between 3 and 7 mA).
I think both my key fobs do this, which is more than a simple fluke.
My last battery lasted less than 1 week.
#2
Race Director
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No.
Try this: Take a new battery and insert it backwards. Plus to minus and minus to plus. Then remove and insert it the correct way round.
Also, be sure a battery button doesn't get pressed and held down when you sit down. I always remove my car keys from my pockets to avoid this.
Try this: Take a new battery and insert it backwards. Plus to minus and minus to plus. Then remove and insert it the correct way round.
Also, be sure a battery button doesn't get pressed and held down when you sit down. I always remove my car keys from my pockets to avoid this.
#3
Rennlist Member
Thread Starter
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No.
Try this: Take a new battery and insert it backwards. Plus to minus and minus to plus. Then remove and insert it the correct way round.
Also, be sure a battery button doesn't get pressed and held down when you sit down. I always remove my car keys from my pockets to avoid this.
Try this: Take a new battery and insert it backwards. Plus to minus and minus to plus. Then remove and insert it the correct way round.
Also, be sure a battery button doesn't get pressed and held down when you sit down. I always remove my car keys from my pockets to avoid this.
I resoldered all the surface mount leads on the IC chips, then washed everything in acetone to remove any flux. It seems to be working correctly now - no current draw after the button is pressed.
I will have to check my second set of keys to see if they do the same thing.
#4
Rennlist Member
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The Printed Circuit Board switches may be sticking/bad.
If it is the switch you can replace it.
Part #CKN9193CT-ND
http://search.digikey.com/scripts/Dk...T-ND&x=26&y=17
--------------------------------------------------------------------------------
http://www.renntech.org/forums/topic...opped-working/
From the above link"
"Dave:
There is an interesting article in the June 2010 issue of Excellence Magazine entitled: "Fob 4 Less: Fixing a modern Porsche key for less than $3 bucks". The article describes rescuing a dysfunctional key by replacing a couple of small, inexpensive momentary switches. Looks relatively easy to do and since the electronic functions of your key are already messed up you don't have much to lose. I have one non-functional fob, but since the other is working I haven't tried this idea yet. I did call the dealer about a replacment. They offered to solve the problem for $375. If you go the diy route please let folks know how it works out.
The article lists the source for the momentary switch as: www.digikey.com, phone # (800-344-4539). The three switches (this is a reply to a targa owner 3 switch Remote) are normally off (part # CKN9193CT-ND). The web link is:
http://search.digike...CT-ND&x=27&y=19"
If it is the switch you can replace it.
Part #CKN9193CT-ND
http://search.digikey.com/scripts/Dk...T-ND&x=26&y=17
--------------------------------------------------------------------------------
http://www.renntech.org/forums/topic...opped-working/
From the above link"
"Dave:
There is an interesting article in the June 2010 issue of Excellence Magazine entitled: "Fob 4 Less: Fixing a modern Porsche key for less than $3 bucks". The article describes rescuing a dysfunctional key by replacing a couple of small, inexpensive momentary switches. Looks relatively easy to do and since the electronic functions of your key are already messed up you don't have much to lose. I have one non-functional fob, but since the other is working I haven't tried this idea yet. I did call the dealer about a replacment. They offered to solve the problem for $375. If you go the diy route please let folks know how it works out.
The article lists the source for the momentary switch as: www.digikey.com, phone # (800-344-4539). The three switches (this is a reply to a targa owner 3 switch Remote) are normally off (part # CKN9193CT-ND). The web link is:
http://search.digike...CT-ND&x=27&y=19"
#5
Rennlist Member
Thread Starter
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Not in stock, but I suspect that a sub could be found if needed
However, that could be the problem. So far resoldering seems to have it working, but time will tell.
However, that could be the problem. So far resoldering seems to have it working, but time will tell.
The Printed Circuit Board switches may be sticking/bad.
If it is the switch you can replace it.
Part #CKN9193CT-ND
http://search.digikey.com/scripts/Dk...T-ND&x=26&y=17
--------------------------------------------------------------------------------
http://www.renntech.org/forums/topic...opped-working/
From the above link"
"Dave:
There is an interesting article in the June 2010 issue of Excellence Magazine entitled: "Fob 4 Less: Fixing a modern Porsche key for less than $3 bucks". The article describes rescuing a dysfunctional key by replacing a couple of small, inexpensive momentary switches. Looks relatively easy to do and since the electronic functions of your key are already messed up you don't have much to lose. I have one non-functional fob, but since the other is working I haven't tried this idea yet. I did call the dealer about a replacment. They offered to solve the problem for $375. If you go the diy route please let folks know how it works out.
The article lists the source for the momentary switch as: www.digikey.com, phone # (800-344-4539). The three switches (this is a reply to a targa owner 3 switch Remote) are normally off (part # CKN9193CT-ND). The web link is:
http://search.digike...CT-ND&x=27&y=19"
If it is the switch you can replace it.
Part #CKN9193CT-ND
http://search.digikey.com/scripts/Dk...T-ND&x=26&y=17
--------------------------------------------------------------------------------
http://www.renntech.org/forums/topic...opped-working/
From the above link"
"Dave:
There is an interesting article in the June 2010 issue of Excellence Magazine entitled: "Fob 4 Less: Fixing a modern Porsche key for less than $3 bucks". The article describes rescuing a dysfunctional key by replacing a couple of small, inexpensive momentary switches. Looks relatively easy to do and since the electronic functions of your key are already messed up you don't have much to lose. I have one non-functional fob, but since the other is working I haven't tried this idea yet. I did call the dealer about a replacment. They offered to solve the problem for $375. If you go the diy route please let folks know how it works out.
The article lists the source for the momentary switch as: www.digikey.com, phone # (800-344-4539). The three switches (this is a reply to a targa owner 3 switch Remote) are normally off (part # CKN9193CT-ND). The web link is:
http://search.digike...CT-ND&x=27&y=19"