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Toyota Sienna Key/Fob Not Working (How To Fix)

A Toyota Sienna key fob controls the vehicle’s essential functions, including the power lock, unlocking or locking the trunk, and allowing keyless entry. Hence, you may face problems when the key/fob stops working.

The following section identifies the various causes of this problem and suggests ways to resolve the issue.

Hand holding car key fob

Toyota Sienna key/fob not working can be due to depleted batteries, a blown fuse, a dead 12V battery, a faulty key fob, a broken key, a damaged car lock, or a faulty ignition cylinder. Replace the dead batteries or damaged components to resolve the issue.

The newest Toyota Sienna models have a keyless entry system that detects the key fob and unlocks the vehicle without pressing any button. Thus, your car won’t unlock if the key fob is not working.

Your Toyota Sienna key fob may not work due to dead batteries. The essential fob batteries can last 2-3 years, so if your fob suddenly starts acting up, replacing the batteries may resolve the issue.

If you replace the essential fob batteries but fail to resolve the issue, check the fuse below the steering wheel and replace it if it’s blown. Check the status of the 120 V battery if your car is more than three years old and you have never replaced the battery. Clean the terminals and replace the battery if it’s depleted.

An older Toyota Sienna model whose key is not working can be due to a faulty lock, damaged key, or faulty ignition cylinder. Hence, replace the damaged components to resolve the issue.

Toyota Sienna Key Not Detected

Hand dangling car keys out window

A Toyota Sienna is one of the most reliable minivans on the market, and it offers excellent fuel economy, adaptive cruise control, and, most importantly, a keyless entry system. But what do you do when the keyless entry system doesn’t detect the key?

A Toyota Sienna key not detected can be due to dead key fob batteries, a malfunctioning keyless entry system, a dead car battery, radio interference, or a damaged key fob. Use the manual key and replace the key fob and car batteries.

Also, you can contact a professional to check the keyless entry system and reprogram the key fob.

A Toyota Sienna keyless entry system detects signals from the keyfob to unlock the doors or start the engine. However, it sometimes fails to pick up these signals and displays a ‘key is not detected’ warning sign on the dashboard.

A dead keyfob battery, a weak or dead car battery, or a damaged key fob can cause a Toyota Sienna key detection problem. Additionally, wireless devices such as the anti-theft system can cause signal interference.

The keyless entry system may experience malfunctions and cause this problem. Consider contacting a professional to check the car battery and reprogram the wireless system.

Toyota Sienna Key Stuck In Ignition

Car key in ignition

It can be frustrating when your Toyota Sienna key gets stuck in the ignition, especially when rushing somewhere. However, do not panic. Read the following section to learn how to solve the issue and prevent future recurrence.

A Toyota Sienna key stuck in the ignition can be due to locked steering, the vehicle not being in parking, a dead battery, damaged key, or a faulty ignition cylinder. Put the vehicle in parking and rotate the steering wheel as you jiggle the key. Replace the damaged components to resolve the issue.

Toyota Sienna Key Won’t Turn In

Hand turning car key in ignition

A Toyota Sienna key that won’t turn in means you won’t be able to start your engine. Several reasons can cause the situation. Read the section below to discover why your key won’t turn in the ignition and learn how to solve the issue.

The Toyota Sienna key won’t turn in due to a locked steering wheel, a damaged key, or a faulty ignition cylinder. Rotate the steering wheel as you jiggle the key. Spray a multipurpose lubricant into the ignition and replace the damaged components to resolve the issue.

Your Toyota Sienna key won’t turn in when you accidentally lock the steering. Rotate the wheel in the opposite direction as you turn the key to unlock it. A damaged key won’t turn in the ignition. Hence use a different key and replace the damaged one.

Sometimes a Toyota Sienna key won’t turn in due to dirt or debris in the ignition keyway. Use a multipurpose lubricant to loosen the dirt. Thus, contact a professional to replace the ignition cylinder and resolve the issue.

Toyota Sienna Key Doesn’t Start

Female with hands over face while sitting in car

A Toyota Sienna key that won’t start your vehicle can make a bad day worse, especially when you are late for an important meeting. Before you spend money hiring a professional, read the section below to learn how to fix the problem yourself.

A Toyota Sienna key that doesn’t start can be due to a dead battery, bad starter, damaged key, bad ignition cylinder, malfunctioning security system, or a bad fuel pump. Replace the damaged key and other broken components to resolve the issue.

Your Toyota Sienna key won’t start your vehicle with a dead battery or a bad starter. Likewise, a worn-out key will turn in the ignition but not start your vehicle.

When your Sienna experiences ignition cylinder problems, a bad fuel pump, and a malfunctioning security system, the key will not start. Contact a professional to check the components and replace the damaged ones.

Toyota Sienna Key Fob Not Working

Fingers dangling car keys

A Toyota Sienna key fob that won’t work means you don’t get to enjoy the benefits of the keyless entry system. However, you can identify and fix the problem by reading the section below.

A Toyota Sienna key fob not working can be due to dead batteries, blown fuse, a dead 120V battery, damaged key fob. Replace the key fob batteries and the blown fuse. Clean the battery terminals and replace the damaged key fob.

Replace the 120V battery if cleaning the terminals does not resolve the issue.

Toyota Sienna Key Light Flashing

Car key fob

A Toyota Sienna key light will flash when you put the ignition switch in the OFF or ACC position, indicating an operating security system, and stop when you insert the correct key, indicating the system has been canceled. Thus, if the key light keeps flashing, it indicates a problem. Keep reading to discover why this happens and learn how to solve the issue.

A Toyota Sienna key light flashing can be due to a faulty key, dead key fob, malfunctioning car security system, weak car battery, or faulty car antenna. Use a different key and replace the dead key fob batteries. Contact a professional to service the vehicle security system and resolve the issue.

Toyota Sienna Key fob battery Low

A Toyota Sienna key fob with a low battery can affect the regular operation of the keyless entry system and will not open the vehicle when in your pocket. You may have to move close to the vehicle to unlock it, and your vehicle may not start in worst-case scenarios. Do not fret; This is a minor problem you can fix yourself. Read the following section to learn how to fix the issue.

You can fix a Toyota Sienna key fob battery low issue by replacing the battery. Get new batteries from an authorized Toyota accessories dealer and open the key fob. Please take a picture of the old battery before removing it and replacing it with the new one to resolve the issue.

How To Program Toyota Sienna Key Fob

When your Toyota Sienna key fob runs into problems, your typical reaction would be to replace it. However, it would help if you programmed the fob to work with your vehicle. 

Although purchasing a keyfob from Toyota saves you the process, programming is a simple DIY process that you can perform in a few minutes. Please read the section below to learn how to do it correctly.

You can program your Toyota Sienna key fob by turning the key in the ignition from the off to the on position and repeating the process after a few seconds. Close and open the driver’s door twice, then put and remove the key from the ignition. Ensure to perform the processes 30 seconds apart.

You can program your Toyota Sienna key fob in the following steps.

Step 1: Put the key in the ignition and turn it from OFF to ON. Repeat the procedure after a few seconds.

Step 2: Wait 30 seconds and open and close the driver’s door twice.

Step 3: Insert and remove the key from the ignition, and you will have a programmed key fob.

Depleted batteries, blown fuses, dead 12V batteries, malfunctioning key fobs, broken keys, broken car locks, and defective ignition cylinders can all cause Toyota Sienna key/fob problems. Replace the damaged components to fix the issue.

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KnowMyAuto is the sole owner of this article was published on Oct 9, 2022 and last updated on .

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