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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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Old 03-31-2015, 12:01 PM
2vols 2vols is offline
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Join Date: Nov 2014
Posts: 120
Mein Auto:
Key wont start my car!

Ok so my battery died last week on me. I replaced it and everything is good except for my key diamond keys. One of them will lock and unlock my car, but not start it. The other Diamond key will start my car, but will not lock or unlock it. What is going in with this? Anyone have any suggestions or ideas? I have reprogrammed both keys, and the same result. Any help would be appreciated.
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Old 03-31-2015, 02:49 PM
edjack edjack is online now
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Location: San Jose, CA
Join Date: May 2007
Posts: 13,351
Mein Auto: '97 540i 6 speed
Try rebooting the system: With the trunk open, wait 16 min until the trunk lights go out. Then disconnect the negative battery cable, easiest at the chassis connection.

Wait 5 min or so, and reconnect.

If this doesn't work, you may need to take the car to the dealer for a diagnostic.

In future, identify the model year, model, and mileage.

Ed in San Jose '97 540i 6 speed aspensilber over aubergine leather. Build date 3/97. Golden Gate Chapter BMW CCA Nr 62319.

Last edited by edjack; 03-31-2015 at 02:50 PM.
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