* The Body Control Module (BCM): This is the "brain" of the system. It's a computer module that receives signals from other components and controls the anti-theft functions. Its location varies slightly depending on the trim level, but it's usually found under the dashboard, often near the steering column or under the glove compartment. You'll need to consult a wiring diagram for the exact location.
* The Engine Control Module (ECM): The ECM is also involved in immobilizing the engine as part of the anti-theft system. This is usually found under the hood, but its precise location varies by engine type.
* Transponder in the Key: The key itself contains a transponder chip that communicates with the BCM/ECM to authorize starting the vehicle. This isn't a "location" in the traditional sense, but is crucial to the system.
* Sensors (Possibly): Some systems include additional sensors (e.g., a shock sensor) that trigger an alarm or disable the vehicle if it's tampered with. These sensors would be located within the vehicle’s body. The 1997 model might or might not have these.
In short, there's no single "anti-theft system location." To find specific components, you'd need a wiring diagram specific to your 1997 Dodge Grand Caravan's year, make, model, and engine type. A repair manual would be your best resource. Consulting a mechanic is also recommended if you're having trouble with your anti-theft system.
