You'll need this diode to install a Code Alarm security or remote start system in most vehicles that have a factory-installed alarm or keyless entry system. Warranty: 1 year.

Code Alarm Door Trigger Diode Interface Reviews

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Door Trigger Diode

Written By hawaiiguy, Honolulu on Wednesday, June 19, 2013

Crutchfield Customer Review (What's this?)

First time to purchase on this site and I was amazed for the fast and good service. The item has a good quality and was properly insulated. I used it on my underglow project for my car and it works well. I will buy again on this company in the future.


Written By Barry S, Harleysville, PA on Tuesday, February 26, 2013

Crutchfield Customer Review (What's this?)

Didn't need these.

Hands-on research

What's in the box?

Download owner's manual

  • Door Trigger Diode interface with 5.5" wires on each end (5 wires on one end and 1 wire on the other)
  • Installation instructions

Product Research


Overview: The Code Alarm Door Trigger Diode Interface (DTDI1) can be used to connect the individual door ajar wires (-) in the vehicle to the door trigger input (-) of the alarm system.

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