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Do I need a bypass module to install a keyless entry alarm on my 2003 Honda Civic LX?

 
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what do you mean bypass module ? You lost me on this one. Generally bypass modules are used in conjuntion with a remote start sytem to fool the factory anti theft units.If you are just installing an alrm with a keyless option you won't need one.12 VOLT CONSTANT WHITE (+) IGNITION SWITCH HARNESS STARTER BLACK/WHITE (+) IGNITION SWITCH HARNESS IGNITION 1 BLACK/YELLOW (+) IGNITION SWITCH HARNESS IGNITION 2 N/A IGNITION 3 N/A ACCESSORY/HEATER BLOWER 1 BLACK/RED (+) IGNITION SWITCH HARNESS ACCESSORY/HEATER BLOWER 2 WHITE/RED (+) IGNITION SWITCH HARNESS PARKING LIGHTS ( - ) BLUE (-) @ FACTORY ALARM PARKING LIGHTS ( + ) RED/BLACK (+) @ BACK OF FUSEBOX POWER LOCK WHITE/BLUE (TYPE B) IN GRAY PLUG, ABOVE DRIVERS KICK PANEL POWER UNLOCK WHITE/GREEN (TYPE B) IN GRAY PLUG, ABOVE DRIVERS KICK PANEL LOCK MOTOR WIRE YELLOW/BLACK (+) @ BACK of FUSEBOX, TOP LEFT Plug HORN ORANGE (-) @ STEERING COLUMN HARNESS TACH BLUE @ TACH TEST CONNECTOR BRAKE WHITE/BLACK (+) @ SWITCH ABOVE BRAKE PEDAL FACTORY ALARM DISARM N/A NOTE *1 THE DRIVERS SIDE DOOR TRIGGER IS GREEN (-), THE FRONT PASSENGER DOOR IS LIGHT GREEN/RED (-) AND THE REAR DOOR TRIGGER IS GREEN/WHITE(-).WHEN CONNECTING TO AN ALARM SYSTEM, USE ALL 3 DOOR TRIGGER WIRES AND DIODE ISOLATE.Keep in mind you have a negative door pin isolation on that model, Therefore your door pin trigger input wire will feed all door pin switches. But you must use a 1 amp general purpose diode, every door switch needs its own diode.