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Sorry to bring up a sore subject but I cannot find specific answer to my question anywhere on the forum or anywhere for that matter. I have an 05 DX Sedan with Viper 5701 Security and Auto Start. I got front keyless power locks done by Best Buy when the Auto start was done. Long story short, they wired 524n actuators to 451m box (i think thats the #) and spliced each color wire together coming from actuators to wires coming off of 451m box. If I decide to install rear door actuators can I just splice (same colors of course) wires where front ones are spliced into on the 451m box. It would make sense but don't want to accidentally cook my ECU or something. Thanks!

 
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If you get another 451m module you can wire it like they did for the front doors to another pair of actuators and share the same negative pulse wire from the keyless entry module to activate the back 451m module.

 
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Thanks GolNat. I talked to guy at Best Buy and he said I can add another module but don't have to. Has anyone had a bad experience wiring in 4 actuators to 1 451m module?