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XpressKit 509U

Ultrasonic sensor for Python® and Viper security systems

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Item # 607509U

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Our take on the XpressKit 509U

Get more out of your Python or Viper security system with XpressKit accessories. These handy add-ons let you incorporate luxury, security and convenience features into your vehicle.

Get more out of your Python or Viper security system with XpressKit accessories. These handy add-ons let you incorporate luxury, security and convenience features into your vehicle.

The 509U ultrasonic sensor monitors the airspace inside your vehicle and is sophisticated enough to detect subtle window tampering, such as the slight change caused by pressure on a side window when a thief tries to "slim-jim" your doorlock. You'll enjoy an extra measure of protection when your alarm is armed. Warranty: 1 year

Note: If you know how to use a multimeter and have experience working with your vehicle's electrical system, you should be able to install this car security equipment. If you're unfamiliar with installing car security equipment, please call 1-888-955-6000 to discuss your purchase with one of our Advisors.

What's in the Box:

  • Ultrasonic sensor control module
  • 3-Pin to 4-Pin wiring harness
  • 2 Ultrasonic transducers with attached 11.75' wire
  • Wire tie
  • 2 Mounting screws
  • 2 Mounting bracket
  • 2 Mounting plates
  • Two-sided tape
  • Installation Instructions

Hands-on research

Product Research


Overview: The 509U Ultrasonic Sensor is used to proved coverage of a vehicle's interior cabin area. The sensors detect movement inside the vehicle by sensing air disturbance. The will trigger the alarm if a thief has gained access to the interior of your vehicle.

Compatibility: The 509U can interface with the 4-piin MUX port of all Directed security systems using the supplied wiring harness. For other Directed and non-Directed security systems that doe not have the 4-pin MUX ports, the 509U can be hard-wired to a negative instant trigger sensor input.

Mounting: The 509U should be mounted under the dashboard that is close enough that the supplied 40" wire harness can reach your alarm control module and the supplied transducers will reach the top of the A-pillar on both the driver and passenger sides of your vehicle. The transducers come supplied with mounting brackets which allow you to angle and position the transducers for maximum coverage.

Controls: the 509U features a sensitivity adjuster control which allows you to adjust the sensitivity of the Ultrasonic Sensor.

Connections: The 509U is equipped with two 2-pin ports used for the two supplied transducers and one 3-pin port used for the supplied wiring harness. The wiring harness features three wires that will need to hardwired to your vehicle's and alarm wiring.

  • Red (+) 12V Constant: connect this wire to a fused 12V constant power source
  • Black (-) Chassis Ground: connect this wire to chassis ground of the vehicle
  • Blue (-) Trigger Output: connect this wire to the instant trigger input of the vehicle security system


  • Ultrasonic Sensor Module: Width = 2.125", Height = 0.565", Depth = 1.415"
  • Transducers: Width = Diameter = 0.565", Length = 0.995"

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Q & A

Customer Q&A

1 question already asked

You will want to contact an Advisor by phone or online chat to discuss compatibility. They will be able to pull up your gear and see if this will integrate. If it does not, then they will also be able to discuss other options with you. [ Jeff  Jan 03, 2014 ]  Staff