Where is computer module 1989 ford F-250 xlt lariat?

There's no single "computer module" in a 1989 Ford F-250 XLT Lariat. These trucks used a distributed system with several modules controlling different aspects of the vehicle. The main control module, often referred to as the Powertrain Control Module (PCM) or Engine Control Module (ECM), is typically located under the hood, often near the firewall or on the driver's side fender area. However, its exact location might vary slightly depending on the specific engine and options.

Other modules like the Body Control Module (BCM) would be elsewhere in the vehicle, likely under the dash or in a similar less accessible location.

To find the specific module you're looking for (if you know which one it is), you'll need to:

1. Consult a wiring diagram: A wiring diagram specific to your 1989 F-250's year, engine, and options will show the location of all the modules. These can sometimes be found online (through forums dedicated to classic Ford trucks) or in a repair manual for your vehicle.

2. Look for labels: Modules often have labels indicating their function. Look carefully under the hood and inside the cab, particularly near wiring harnesses.

3. Check online forums: Ford truck enthusiast forums are an excellent resource. Search for your specific year, model, and the module you're looking for. Others may have already documented the location.

Without knowing *which* computer module you need to find, it's impossible to give you a more precise location.