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The Grand Prix was updated for 2004 on a revised version of the GM W platform and was unveiled at the 2002 Chicago International Auto Show on February 7, 2002 as the Grand Prix G-Force Concept.

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Why will the door behind the driver not unlock with key

All the other door locks unlock with the key with the exception of the one behind the driver.

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Hi,

Do you mean that the rear door power lock actuator doesn’t operate when you press the key or that you cannot open the door from the inside when the door is unlocked?

If you cannot open the door from the inside then check if the rear door security lock is activated.

Here’s an image taken from the owner manual that may help.

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(click on image to enlarge for better viewing)

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paul seefeldt will be eternally grateful.
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