Why does the horn and lights go on and off when I connect both battery cables?

2004 LEXUS RX 330
120,000 MILES
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KSWITZER
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I tried to install a new battery because the old battery kept going dead if I didn't drive the car for a week. I put on the positive cable and when I put the neg cable on it acts the same as if I pressed the panic button on the remote.
Jan 28, 2012 at 3:39 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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