How To Fix Full Accessory Power Active

How to Fix Full Accessory Power Active: Troubleshooting Your Car's Electrical System

Is your car's battery draining even when the engine is off? A persistent "Full Accessory Power Active" message often points to a problem with your vehicle's electrical system. This issue can be frustrating, but with some systematic troubleshooting, you can usually identify and fix the culprit. This guide will walk you through the steps to diagnose and solve this common automotive problem.

Understanding "Full Accessory Power Active"

The "Full Accessory Power Active" message (or similar wording depending on your car's make and model) indicates that your car's accessories are drawing power even when the ignition is off. This constant drain can quickly deplete your battery, leaving you stranded. Several components could be the cause, ranging from simple oversights to more complex electrical faults.

Common Causes and Troubleshooting Steps

Let's delve into the most common reasons behind a persistent "Full Accessory Power Active" message and how to troubleshoot them:

1. Lights Left On

This is the most common and often easiest fix. Check all interior and exterior lights. Make sure headlights, taillights, dome lights, and even glove compartment lights are turned off. A single malfunctioning light can drain your battery over time.

2. Doors Not Properly Closed

Sometimes, a door not fully closed can trigger interior lights to stay on. Carefully check each door to ensure it's securely latched. This is especially relevant for cars with courtesy lights that remain on until all doors are closed.

3. Malfunctioning Accessory

This is where things get slightly more complex. Systematically turn off each accessory one by one. This includes the radio, heated seats, climate control, and any other features that draw power. If turning off a particular accessory stops the drain, you've likely found your culprit. Consider having the faulty component repaired or replaced.

4. Faulty Electrical Component

If you've ruled out the obvious culprits, a faulty electrical component might be at play. This could include:

• Alternator: A malfunctioning alternator may not charge your battery properly, leading to rapid drainage even with the engine off.
• Radio: A faulty radio can draw significant power even when switched off.
• Interior Lights: A short circuit in the wiring of your interior lights could cause them to remain on.
• Aftermarket Accessories: Newly installed accessories may have faulty wiring or draw excessive power.
• Body Control Module (BCM): In some cases, a problem with the BCM can lead to unexpected power draws.

5. Parasitic Draw Test

If you're still unable to pinpoint the problem, a parasitic draw test is recommended. This requires a multimeter to measure the current draw when the car is off. This procedure is best left to experienced mechanics or automotive electricians as incorrect handling could damage your vehicle's electrical system. A parasitic draw above a certain level (typically around 50mA) indicates a significant problem.

6. Battery Issues

While not always the direct cause of the "Full Accessory Power Active" message, a weak or failing battery can exacerbate the problem and even trigger the warning. Have your battery tested at an auto parts store to ensure it's holding a sufficient charge. A faulty battery may need replacement.

Preventing Future Issues

Regular maintenance can significantly reduce the likelihood of encountering this problem:

• Regularly check your lights and accessories. Ensure everything is turned off before exiting your vehicle.
• Have your car's electrical system inspected periodically. This includes the battery, alternator, and other key components.
• Be cautious when installing aftermarket accessories. Ensure they are properly wired and don't draw excessive power.

By following these troubleshooting steps, you should be able to identify and resolve the cause of your "Full Accessory Power Active" message and keep your car's electrical system running smoothly. Remember to always prioritize safety and consult with a professional mechanic if you're unsure about any repair steps.