Instead of searching for a dedicated tach wire, remote start installers typically use one of these methods to get the engine running signal:
* Data wire from the car's computer (preferred): This is the cleanest and most reliable method. A properly programmed remote start system will communicate with the car's computer via the data bus (usually a CAN bus system) and obtain the necessary information to start the engine. This often avoids the need to tap into any other wires. This requires a compatible interface module designed for your specific car's year, make, and model.
* Ignition wire (less preferred): Some simpler remote start systems might use the ignition wire as a "tach signal." However, this is less precise and can lead to problems. The system might interpret other electrical events as the engine running. The ignition wire is usually easily located.
Finding the information:
1. Consult the remote start system's instructions: The manual for your specific remote start kit will be your best resource. It should provide specific instructions and wiring diagrams for a 1998 Cavalier.
2. Wiring diagrams: You can find wiring diagrams online (often on forums dedicated to car electronics or specific car models) or through a subscription service like AllDataDIY or Mitchell1. These diagrams can help locate the relevant wires. Be extremely careful when using these; misinterpreting a wiring diagram can damage your car's electrical system.
3. Professional installation: The most reliable approach is to have a professional installer do the work. They have the experience and tools to correctly identify the necessary signals and install the remote starter safely. This will save you time, prevent potential damage to your vehicle, and ensure the system functions correctly.
Attempting to install a remote starter without proper knowledge can be risky. Incorrect wiring could damage your car's electrical system or even create a fire hazard. Proceed with caution or consult a professional.
