How to Install a Remote Start in Your Car

By Car Audio and Tint | Car Toys | Washington, Texas, Colorado ... | Published: 2026-10-25

Category: How-to Guides

Learn the step-by-step process for installing an aftermarket remote start system, including wiring, soldering, and programming tips for a reliable setup.

Quick answer

Installing a remote start yourself is possible if you have basic electrical skills, but proper soldered connections and careful wiring are critical for reliability. For most 2015 or newer vehicles, an iDatalink ADS-THR module simplifies the process.

Why soldering matters for remote start wiring

Remote start systems handle multiple power and signal wires that must stay connected under vibration and temperature changes. Properly soldered connections are the gold standard for any wire that has to be spliced. Cheap plastic connectors or twist-and-tape methods can loosen over time, causing intermittent failures or even a no-start condition.

If you are not comfortable soldering, consider having the installation done by a shop. Many remote start kits come with installation included, but the quality of the install depends on the technician's technique.

Vehicle compatibility and module selection

Not every vehicle supports a plug-and-play remote start. For cars 2015 or newer, an iDatalink ADS-THR module often eliminates the need to splice into the factory anti-theft system. This module communicates digitally with the vehicle's computer, making installation faster and more reliable.

Older vehicles may require hardwiring into ignition, starter, and accessory circuits. Always check compatibility before buying a kit.

Step-by-step remote start installation guide

1. Disconnect the battery and gather tools: Disconnect the negative battery terminal to prevent shorts. Gather a soldering iron, solder, heat shrink tubing, wire strippers, multimeter, and the remote start kit. Never skip disconnecting the battery — a short can damage the vehicle's ECU.
2. Locate and identify vehicle wiring: Use a multimeter to find constant 12V, ignition, starter, accessory, and ground wires at the ignition switch harness. Refer to your vehicle's wiring diagram. Double-check each wire with the multimeter; color codes vary by year and trim.
3. Solder and heat-shrink all connections: Strip 1/4 inch of insulation, twist wires together, apply solder until it flows, then slide heat shrink over the joint and shrink it. Do not use crimp connectors or electrical tape. A cold solder joint will fail — ensure the solder melts fully and bonds both wires.
4. Connect the remote start module: Follow the kit's wiring diagram to connect the module to the vehicle wires. If using an iDatalink ADS-THR, connect the data cable to the vehicle's OBD-II port instead of hardwiring. Label each wire before connecting to avoid confusion later.
5. Program the remote start system: Turn the ignition to the ON position without starting the engine. Follow the kit's programming sequence — usually pressing the brake pedal or valet button a set number of times. If programming fails, check all connections and try again. Some modules require a firmware update.
6. Test all safety features: Reconnect the battery. Test the remote start with the hood closed, doors locked, and the vehicle in Park. Verify that the engine shuts off if the brake is pressed or the hood is opened. Never skip safety testing — a remote start that ignores the hood switch is a serious hazard.
7. Secure wiring and reassemble: Zip-tie all wires away from moving parts and sharp edges. Reinstall the steering column covers and any trim panels you removed. Loose wires can cause shorts or interfere with pedals — route them carefully.

Recommended product for your install

Remote Start Installed!: Installation Included but not just any install. Properly soldered connections are the gold standard for any wire that has to be spliced. Remote Starts are complex systems and at Car Toys we use the highest install standards on every connection. No cheap plastic connectors. Choosing a professionally installed remote start ensures every connection is soldered and tested, reducing the risk of future electrical issues.
Remote Start Installed!