Question about 2005 Buick LaCrosse

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Keys won,t lock or unlock doors

I have a 2005 Buick Lacrosse and on the keyless remote the only thing that will open is the trunk and the panic button will go off.The doors won't lock or unlock.I replaced the battery with a new one.

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Use this Procedure for Buick Vehicles "With" Driver Information Center Buttons.

This information is in your "Owners Manual" in the "Drivers Information Center Section."

1. Insert Key and turn to ON position so you can access Driver Information Center.

2. Press the vehicle information button until PRESS TO RELEARN REMOTE KEY displays.

3. Press the set/reset button until REMOTE KEY LEARNING ACTIVE displays.

4. Press and hold the lock and unlock buttons on the key-less remote at the same
time for approximately 15 seconds. A chime will sound indicating that the remote is
programmed.

5. To program additional remotes at this time repeat step 4. This vehicle can have a maximum of eight remotes programmed.

6. To exit programming mode turn key off and remove key. Test remote(s).


Use this Procedure for Buick Vehicles "Without" Drivers Information Center Buttons.

To access this display, the vehicle must be in Park (P) with key in the on position (as far as you can go without cranking engine).

1. Press the trip odometer reset stem until RELEARN REMOTE KEY displays.

2. Press and hold the trip odometer reset stem for three seconds. The message REMOTE KEY LEARNING ACTIVE will display

3. Press and hold the lock and unlock buttons on the first key-less remote at the same
time for approximately 15 seconds. A chime will sound indicating that the remote is
programmed.

4. To program additional remotes at this time repeat step 3. This vehicle can have a maximum of eight remotes programmed.

5. To exit programming mode turn key off and remove key. Test remote(s).

Good Luck !

Posted on Apr 28, 2013

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Aparrently you have to reset the remote, I have the same problem and a trying to figure out how to reset it.

Posted on May 16, 2009

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2009 Buick Lacrosse automatic door locks, interior button and fob not working


Have you had it checked to see if DTC'S - diagnostic trouble codes stored in the BCM - body control module ? That's the first thing you should have done . Dealer or other independent reair shop that has a factory or professional type scan tool . Auto part stores can't pull these codes .
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RFA / MOD fuse 10amp . location - insturment panel fuse box. Fuse Block - I/P
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DTC B3102
DTC B3103
DTC B3106

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DTC B3102 Keyless Entry Data Link Circuit Low
DTC B3103 Keyless Entry Data Link Circuit High
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