Navigation upgrade?
Hi and welcome to the forums. I moved this thread from the Frequently Asked Questions forum to the applicable 3G TL forum .
Please click here to read the announcement at the top of the FAQ Forum for more information.
Please click here to read the announcement at the top of the FAQ Forum for more information.
And the answer to your question is 
Taken from the 3G TL Audio & Electronics FAQ

Taken from the 3G TL Audio & Electronics FAQ
Originally Posted by datmrman
Q: Is it possible to add MP3/XM Nav Traffic/backup camera from the '07 TL and install it into the '04-'06 TL?
A: It has yet to be proven, but the newer system seems to be integrated such that to obtain full functionality of the '07 system, a majority of the system will need to be upgraded. The headunit needs to be upgraded to incorporate MP3 functionality; the navi DVD drive needs to be upgraded to use the new 4.X system and the backup camera; the XM module needs to be upgraded to add XM Nav Traffic. The costs to do such a revamp will run in the thousands.
More details can be found in the following threads:
A: It has yet to be proven, but the newer system seems to be integrated such that to obtain full functionality of the '07 system, a majority of the system will need to be upgraded. The headunit needs to be upgraded to incorporate MP3 functionality; the navi DVD drive needs to be upgraded to use the new 4.X system and the backup camera; the XM module needs to be upgraded to add XM Nav Traffic. The costs to do such a revamp will run in the thousands.
More details can be found in the following threads:
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