Just changed my battery and my vgrs light is now on ?? its a lexus lx470 05 model

Clean connectors.

Variable Gear Ratio Steering.

Did y replace your battery with the proper model that match the car requirments? Is the battery properly connected?

Be sure to use the correct battery, properly in place, clean the key contacts , See owner's manual for additional information.
There are specialized locksmiths for car keys

When this light is on it indicates a problem has occurred in the system, you must get it diagnosed and repaired and the light will then reset itself

Variable Gear Ratio Steering (Makes it easier to turn when stationary or moving slow)

Not knowing your model or year, I can't investigate any further with what you have provided.

Looking in other forums, the most useful comment that I can see says that a guy had this same problem after installing a Sat TV system, somehow that process fried the VGRS computer He called Lexus of Honolulu, who informed him that the car was both safe and driveable in the current state. A local dealer fixed the problem for him. The only effect of the light was that the steering did not become more sensitive for parking maneuvers. the job discussed was fixed under warranty, It is not a cheap fix.

The Lexus LS has a recall on it for VGRS issues. You can read more at:
http://lexusenthusiast.com/2010/05/19/lexus-ls-to-be-recalled-for-vgrs-issue/

I HAD THE SAME PROBLEM WITH 199 ES 300 LEXUS. TRY CHANGING THE POSITIVE BATTERY AND THAT SHOULD SOLVE THAT PROBLEM.

try to take cables off battery let sit for five or tem min. then put + on first

Every 90,000 miles or 72 months per manufacturers recommendations.