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iDatastart ADS-THR-MA3

Remote start T-harness for select 2013-up Mazda, Scion, and Toyota vehicles (CMHCXA0 module also required)

Item # 794THRMA3

Find what Fits your vehicle

Item # 794THRMA3

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About the iDatastart ADS-THR-MA3

Vehicle-specific T-harness for an iDatastart remote starter

iDatastart's ADS-THR-MA3 T-harness connects their iDatastart CMHCXA0 HC remote start module to your select Mazda, Scion, or Toyota vehicle. This T-harness plugs into your vehicle's electrical databus system, allowing you to start and stop the engine remotely, and control some basic factory security functions as well. Some wiring may be required — one to four connections, typically. You can identify your vehicle in our fit guide to see if this harness is compatible. Warranty: limited lifetime.

What's in the box:

  • 26" Main T-harness
  • 29" 12-pin harness
  • 29" One-wire harness
  • Two 8" optional terminal wires (pinned for Molex plug)

Customer reviews

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More details on the iDatastart ADS-THR-MA3

Research Team

Product Research


Overview: The iDatastart THR-MA3 installation harness is designed to simplify the installation of your iDatastart CMHCXA0 remote start module (sold separately) into select 2013 - up Mazda, Fiat, Scion, and Toyota vehicles.

Installation: The iDatastart kit includes various vehicle-specific harnesses designed to provide a direct connection into your compatible vehicle while connecting to the remote start module on the other end, saving you considerable time and effort. The main T-harness interfaces into the ignition system, providing direct connections for the Starter, Ignition, and Accessory wires. Other functions may include Door Lock operation, Parking Light flash, Horn Honk, as well as Door, Hood, and Trunk pin switch activation (individual functions will vary, please see vehicle specific information for details).

Note: The included harnesses will take care of the bulk of required wiring, but some hardwiring into the vehicle's wiring system will still be required.

Vehicle Compatibility Chart: Click here for a list of compatible Mazda, Fiat, Scion, and Toyota vehicles. Or, click here to find out what works with your particular vehicle.

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Customer Q&A

1 question already asked

What is the best way to connect the parking light wires to the existing harness?
[ Matthew  Aug 30, 2021 ]
4 answers
I removed the turn signal module, it un-clips and slides out super easily then used a low temp solder wire connector to complete the circuit after connecting the harness in
[ DAVID  Aug 31, 2021 ]
TL:DR - Don't bother. It works fine without hooking up the parking lights. I did not want to tear apart the steering column on my 2016 Mazda CX-5 to get at the required wires to tap into the parking lights. I also did not want to mess with the factory wiring outside of the adapter harness. I didn't bother to hook up the hood switch either. But it works as it should for my intneded purpose. I just wanted to warm up/cool down the car from my house before I leave.
[ TYLER  Aug 30, 2021 ]
I didn't. Since I'm using the factory remote, the process of hitting lock, unlock, lock, flashes the parking lights already. Once it starts though it's back to whatever lighting the car would be on a normal start.
[ Jesse  Aug 30, 2021 ]
I spliced, soldered, and heat shrunk. That fit in the space the best, and I knew it would be a good connection
[ KRAIG  Aug 30, 2021 ]

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