How to Install a Car Alarm in a VW Passat

Written by ehow cars editor
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Making a VW Passat more secure and lowering insurance rates are common reasons to install an alarm. Putting the alarm in the VW Passat requires a working knowledge of car electrical systems and basic tools. You can also add features like remote start and alert paging with an alarm system that includes expansion ports.

Skill level:
Moderately Challenging

Things you need

  • Alarm kit with vehicle wiring adapters
  • Zip ties
  • Drill
  • Screwdrivers

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  1. 1

    Read the alarm manual carefully and identify all of the parts. Open the hood and remove the positive battery cable. Look for an open area and mount the alarm siren so that it faces the engine or back of the car. Attach the alarm power wire to the positive battery cable and run all the wires to the driver's side of the firewall. Feed the wires through the existing hole where the engine wires are.

  2. 2

    Locate the starter wire in the ignition harness under the steering wheel. Attach the start disable relay and run the wire into the dash of the Passat. Find the door lock relay if the car is equipped and connect the alarm's power lock module.

  3. 3

    Mount the shock sensor as directed by the manufacturer and run the wire to the driver's side of the dash. Mount the alarm control module as far back in the dash as possible by securing it to an existing wire bundle with zip ties.

  4. 4

    Drill a small hole in the dash for the LED light and snap it into place. Connect the siren, power, LED, door lock and start disable wires to the control module.

  5. 5

    Reconnect the positive battery cable on the VW Passat and test the alarm. Adjust the alarms sensitivity if necessary and secure any loose wires with zip ties.

Tips and warnings

  • Call the technical support number supplied with the alarm if you have installation problems or questions.

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