The Toyota Corolla has one of the highest theft rates of any vehicle, which makes installing an alarm an easy decision. Installing an alarm in this vehicle requires considerable car wiring skills and the correct wiring diagram. Professional installation is needed for 2007 and later models as Toyota has incorporated a complex data system to thwart would be thieves and unfortunately, most do-it-yourselfers.
Read the alarm manufacturer's manual carefully and identify each of the parts included. Open the hood and remove the positive battery cable from the terminal. Connect the alarm power wire to the positive cable and run it along the firewall to the driver's side.
Find an open area in the engine bay and mount the siren facing the engine. Pull the wires to the driver's side of the firewall and feed all of the wires through the firewall and into the cabin.
Remove the lower dash panel beneath the steering wheel and open the fuse box. Snap the alarm's door lock module into the existing door lock relay, located in the driver door by unsnapping the trim clips. Drill a small hole for the LED light and snap it into place.
Mount the shock sensor per the manufacturer's instructions and locate the starter wire in the ignition harness in the steering wheel column. Attach the start disable relay and run all of the wires under the dash.
Connect the power, LED, siren, door lock and disable relay wires to the control module. Mount the control module as far into the dash as possible by securing it to a heavy wire bundle or cross member with zip ties.
Reconnect the positive battery cable on the Toyota Corolla and test the alarm. Adjust the alarm's sensitivity as needed and secure any loose wires with zip ties.
