How do I get my Acura MDX out of accessory mode?
To exit accessory mode on an Acura MDX, you generally need to move the ignition from ACCESSORY to ON, and then start the engine if you want to drive. The exact method depends on whether your MDX uses a traditional key or a push-button start.
Understanding the ignition options in the MDX
MDX models use either a traditional key ignition or a modern push-button start. Both setups have an ACCESSORY position, but the steps to exit that mode differ slightly. Below are the steps for each type to help you return the vehicle to normal operation.
Traditional key ignition
In models with a physical key, you switch the ignition from ACCESSORY to ON to power more systems, and from ON to START to crank the engine if you want to drive. Here are the typical steps:
- With the key in the ignition, rotate the key from OFF/ACC toward ON to exit ACCESSORY mode.
- If you want to start the engine, continue turning to START while pressing the brake pedal (automatic transmission) or follow your normal starting procedure. Release the key when the engine starts or after you’ve reached the desired RPM.
- Once the engine is running, the key will typically return to the ON position automatically.
Leaving ACCESSORY and moving to ON allows all essential systems (dial clusters, radio, power windows, and other electronics) to operate while keeping the engine ready to start.
Push-button start (keyless) MDX
For MDX models with a Start/Stop button, you generally move from ACCESSORY to ON by pressing the button once (with your foot off the brake). To start the engine, you’ll usually press the brake and press the button again. Here are the steps:
- Make sure the fob is inside the vehicle. With your foot off the brake, press the Start/Stop button once to move from ACCESSORY to ON.
- To start the engine, press the brake pedal and press the Start/Stop button again. The engine should crank and start, after which the vehicle returns to normal operation.
If the engine is already running, pressing the Start/Stop button once with the brake not pressed typically returns the vehicle from START mode to ON/Ready.
Troubleshooting common issues
If you’re unable to exit accessory mode, check these common causes before seeking help:
- The transmission should be in Park for many models to exit ACC; verify the selector is in Park before attempting to start.
- The brake pedal must be pressed when starting, especially on push-button start models.
- Battery or key fob issues can prevent the system from recognizing ACC or enabling a proper start. Ensure the fob has a charged battery and is within range.
- In some situations, a security or immobilizer warning can limit starting until reset or a manual relearn is performed. If you see a security light, consult the manual or dealer.
If problems persist, consult your owner's manual or contact Acura Roadside Assistance for guidance specific to your vehicle’s VIN and configuration.
Summary
Exiting accessory mode on an Acura MDX is usually a quick shift from ACCESSORY to ON, followed by starting the engine if you intend to drive. For key-based models, rotate the key to ON and then to START as needed. For push-button starts, press the Start/Stop button once to reach ON, then press again with the brake to start. If issues arise, ensure the vehicle is in Park, the brake is pressed, and the key fob is functioning properly, and consult your manual or dealer if problems continue.
