How To Add Remote Start To Car

So, you're thinking about adding remote start to your car? Excellent choice! It’s a fantastic upgrade, especially during those brutal winters or scorching summers. This article will guide you through the process, assuming you already have some basic automotive electrical knowledge and aren't afraid to get your hands dirty. We'll break down the key components, wiring, and potential pitfalls to help you tackle this project with confidence. Remember, safety first, and when in doubt, consult a professional.

Purpose of Understanding Remote Start Installation

Understanding the intricacies of a remote start system is crucial for several reasons. Firstly, it allows you to perform the installation yourself, saving a significant amount of money on labor costs. Secondly, having this knowledge empowers you to troubleshoot any issues that might arise down the line. Whether it's a faulty connection, a programming glitch, or a component failure, you'll be equipped to diagnose and rectify the problem. Finally, it deepens your understanding of your car's electrical system, making you a more competent and confident DIYer.

Key Specs and Main Parts of a Remote Start System

A typical remote start system consists of several key components, each playing a vital role in its operation. Let's break them down:

Remote Start Module: This is the brain of the system. It receives the signal from the remote, interprets it, and initiates the starting sequence. This module often includes safety features such as a hood pin switch that prevents the car from starting if the hood is open.
Remote Control (Fob): This allows you to remotely control the system. Different models offer varying ranges and features, such as keyless entry or trunk release.
Wiring Harness: This collection of wires connects the module to the car's electrical system. Proper wiring is absolutely crucial for correct functionality and safety.
Bypass Module (Transponder Bypass): Many modern cars have immobilizer systems that prevent the car from starting without the correct key present. A bypass module tricks the car into thinking the key is present during remote start. There are two main types:
- Data Bypass: Communicates with the car's computer network (CAN bus) to bypass the immobilizer. Generally easier to install but requires specific vehicle compatibility.
- Key-in-the-Box Bypass: Involves physically hiding a spare key inside a box near the ignition switch. Less elegant but works with a wider range of vehicles.
Hood Pin Switch: A safety device that prevents the car from starting remotely if the hood is open. This is essential to prevent accidental starting during maintenance.
Antenna: Receives the signal from the remote control. Proper placement is important for optimal range.

Key specifications you need to consider include:

Compatibility: Ensure the system is compatible with your car's make, model, and year. Not all systems work with all vehicles, especially those with complex security systems.
Range: Consider the effective range of the remote control. If you need to start your car from a distance, choose a system with a longer range.
Features: Look for features that suit your needs, such as keyless entry, trunk release, or smartphone control.
Power Requirements: Most systems run on 12V DC power, but verify the specific requirements to ensure compatibility with your car's electrical system.

Understanding the Wiring Diagram: Symbols, Lines, and Colors

The wiring diagram is your roadmap for a successful installation. Let's decode the common symbols, lines, and colors you'll encounter:

Wires: Represented by solid lines. Different colors indicate different functions (e.g., red for power, black for ground). Dashed lines often indicate optional connections or connections for specific features.
Connectors: Represented by circles or squares where wires connect. The diagram will often indicate the type of connector and its location in the vehicle.
Relays: Represented by a square with a coil symbol inside. Relays are used to switch circuits on and off, often used for high-current applications.
Resistors: Represented by a zig-zag line. These components limit the flow of current in a circuit.
Diodes: Represented by a triangle pointing towards a vertical line. Diodes allow current to flow in only one direction.
Ground: Represented by a symbol resembling an inverted tree. Ground connections are crucial for completing circuits.

Color Coding: Automotive wiring typically follows a color-coding convention. While not always consistent across all manufacturers, some common colors include:

Red: Positive power (+)
Black: Ground (-)
Yellow: Ignition
White: Often used for accessory power or data signals
Blue: Often used for remote start activation or other control signals
Green: Often used for tachometer signal

Always refer to the specific wiring diagram provided with your remote start system. Color coding can vary, and relying solely on general conventions can lead to errors.

How a Remote Start System Works: A Step-by-Step Breakdown

The remote start process can be broken down into these key steps:

Remote Activation: You press the start button on the remote control. The remote transmits a radio frequency (RF) signal to the antenna connected to the remote start module.
Module Verification: The remote start module receives the signal and verifies its authenticity. This may involve a security code or other authentication measures.
System Check: The module performs a series of checks to ensure it's safe to start the car. This includes verifying that the hood is closed (via the hood pin switch), the parking brake is engaged, and the transmission is in park (for automatic transmissions).
Immobilizer Bypass: If your car has an immobilizer, the bypass module is activated. It sends a signal to the car's computer, mimicking the presence of the key.
Starter Activation: The module activates the starter motor, cranking the engine. It monitors the engine's RPM (often using the tachometer signal) to determine when the engine has started.
Engine Running: Once the engine is running, the module continues to monitor its operation. It may adjust the engine's idle speed to compensate for cold weather.
Shutdown: The engine will automatically shut off after a pre-determined time (typically 15-20 minutes) or if the brake pedal is pressed without the key in the ignition.

Real-World Use and Basic Troubleshooting Tips

Even with careful installation, issues can sometimes arise. Here are some common problems and troubleshooting tips:

Remote not working: Check the battery in the remote. Ensure the antenna is properly connected and positioned. Try reprogramming the remote to the module (refer to the manufacturer's instructions).
Car starts but shuts off immediately: This could be due to a problem with the immobilizer bypass. Double-check the bypass module's connections and programming. Also, verify the tachometer signal connection.
Car doesn't start at all: Verify all power and ground connections to the remote start module. Check the hood pin switch to ensure it's properly installed and functioning. Ensure the parking brake signal is correctly wired.
System interfering with other electronics: Ensure all wiring is properly insulated and routed away from sensitive electronic components. Consider using shielded wiring for critical connections.

If you're encountering persistent issues, don't hesitate to consult a professional installer. Diagnosing electrical problems can be complex, and it's better to seek expert help than to risk damaging your car's electrical system.

Safety Considerations: Highlighting Risky Components

Working with automotive electrical systems can be dangerous if proper precautions aren't taken. Here are some key safety considerations:

Disconnect the Battery: Always disconnect the negative terminal of the battery before working on any electrical components. This will prevent accidental shorts and potential electrical shocks.
Work in a Well-Ventilated Area: Working with wiring can sometimes involve soldering, which produces fumes. Ensure adequate ventilation to avoid inhaling harmful fumes.
Use Proper Tools: Use high-quality wiring tools, such as wire strippers, crimpers, and soldering irons. Using the wrong tools can damage wires and create unreliable connections.
Avoid Cutting Factory Wiring: Whenever possible, use wire taps or connectors to avoid cutting into the car's original wiring. Cutting wires can void your car's warranty and make it difficult to revert to the original configuration. If you absolutely must cut a wire, ensure you make a clean cut and properly insulate the connection.
Properly Insulate Connections: Use electrical tape or heat shrink tubing to insulate all connections. This will prevent shorts and ensure a reliable connection.
Understand the Wiring Diagram: Carefully study the wiring diagram before starting the installation. Misunderstanding the diagram can lead to incorrect connections and potentially damage your car's electrical system.
Airbag Systems: Never work on or near airbag systems without proper training and precautions. Airbags can deploy unexpectedly and cause serious injury. If you need to access wiring near airbags, consult a professional.
Fuel System: Be extremely cautious when working near the fuel system. Fuel is highly flammable and can be ignited by sparks. Avoid smoking or using open flames in the vicinity of the fuel system.

Adding remote start to your car can be a rewarding project, but it requires careful planning, attention to detail, and a strong understanding of automotive electrical systems. By following these guidelines and taking the necessary safety precautions, you can successfully install a remote start system and enjoy the convenience and comfort it provides. Remember, if you're ever unsure about any aspect of the installation, don't hesitate to seek professional assistance.

We have a detailed wiring diagram available for download that complements this article. It includes specific wire locations and connection points for various vehicle makes and models. This diagram will further enhance your understanding of the installation process and help you avoid common pitfalls.