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Old 01-16-2013, 11:03 AM   #1
auto feature
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Join Date: Sep 2010
Location: jamaica
Posts: 141
My Ride: E46 318i
Key charging

If a key that seems to be dead because of not actively driving the car, can the key be recharged by just placing the key in the ignition without actually starting and driving the car?
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Old 01-16-2013, 11:19 AM   #2
shanneba
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Join Date: May 2008
Location: Indiana
Posts: 2,096
My Ride: 2003 330Ci
You must turn the ignition switch to position 1 or 2 to charge the key battery-

Key transmitter

A distinction must be made between two basic versions of radio-control keys:
Up to 9/99, radio-control key with replaceable battery (commercially available lithium battery)
From 9/99, radio-control key with permanently integrated, rechargeable battery. The rechargeable battery is charged in the vehicle via the EWS loop aerial when inserted in the ignition lock and terminal R is switched on (ignition lock in position 1 or 2).


If undervoltage occurs:
The battery in radio-control keys with a replaceable battery must be renewed
The rechargeable battery in radio-control keys with a rechargeable battery must be charged via the ignition lock for at least 30 minutes
A voltage-independent memory in the radio-control key ensures that the initialization data is not deleted even when the battery/rechargeable battery is discharged.
Note
In the case of radio-control keys with rechargeable battery as from 9/99, it should be noted that self-discharge, normal for rechargeable batteries, takes place while not in use. The rechargeable battery discharges after approx. 1 year. A fully discharged rechargeable battery must be recharged for approx. 30 hours until it has regained its full capacity.
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Old 01-16-2013, 12:12 PM   #3
auto feature
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Join Date: Sep 2010
Location: jamaica
Posts: 141
My Ride: E46 318i
Quote:
Originally Posted by shanneba View Post
You must turn the ignition switch to position 1 or 2 to charge the key battery-

Key transmitter

A distinction must be made between two basic versions of radio-control keys:
Up to 9/99, radio-control key with replaceable battery (commercially available lithium battery)
From 9/99, radio-control key with permanently integrated, rechargeable battery. The rechargeable battery is charged in the vehicle via the EWS loop aerial when inserted in the ignition lock and terminal R is switched on (ignition lock in position 1 or 2).


If undervoltage occurs:
The battery in radio-control keys with a replaceable battery must be renewed
The rechargeable battery in radio-control keys with a rechargeable battery must be charged via the ignition lock for at least 30 minutes
A voltage-independent memory in the radio-control key ensures that the initialization data is not deleted even when the battery/rechargeable battery is discharged.
Note
In the case of radio-control keys with rechargeable battery as from 9/99, it should be noted that self-discharge, normal for rechargeable batteries, takes place while not in use. The rechargeable battery discharges after approx. 1 year. A fully discharged rechargeable battery must be recharged for approx. 30 hours until it has regained its full capacity.
Thanks for the info, very useful
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