You can't. Only the dealer or independent garage can retrieve the security code via the GEKO system from the factory. Independents must pay for the service to access.
Yes, you can have a car alarm without remote keyless entry. You can read more at www.ecarsecurity.com or www.autotechs.com
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You have to have the dealership program a key less entry remote for 2011 Toyota Camry.
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The 1989 Buick Park Avenue does not come with a remote keyless entry. The keyless remote entry was not available till 1997.
A dealership has to do it for you if it is the original from the dealer. If it is aftermarket, like one from car toys they will have to do it for you. Only the company that installed it will have the codes to program it. I have a 2003 xtreme myself, and i have a dealer keyless entry, but I had car toy's install an alarm with other remote functions, only they can program the newer one.
disconect or cut the alarm speaker wire