Subaru Key Fob Not Working After Battery Change – A Troubleshooting Guide
Having a Subaru key fob that suddenly stops working after changing the battery can be frustrating. But don’t worry – in most cases this issue can be easily fixed with some basic troubleshooting. This guide will walk through the possible reasons your Subaru key fob isn’t working after a battery change plus provide tips to get it functioning again.
Overview of Subaru Key Fobs
Subaru key fobs provide drivers with convenient access to vehicle functions like:
- Locking/unlocking the doors
- Remote starting the engine
- Activating panic alarm
- Arming/disarming the security system
They operate using radio frequency signals over short distances. The integrated battery powers the fob to transmit these wireless signals.
The standard coin-style CR2032 lithium battery typically lasts 1-4 years before needing replacement. Warning signs it’s time for a new battery include:
- Reduced key fob range
- Intermittent functioning
- Warning light on the fob
- Failure to work at all
Changing the battery is usually a fast, straightforward process:
- Pry open the key fob housing using a small screwdriver
- Carefully remove the old battery using a non-metallic tool
- Insert new CR2032 battery with + side facing up
- Snap the case back together and resync with the car
However, if the key fob stops working after a battery change, don’t panic. In most instances, you can get it functioning again with a few troubleshooting steps.
Why Key Fob May Not Work After Battery Change
There are several possible reasons your Subaru key fob isn’t working after changing the battery:
- Incorrect battery orientation – If the battery is inserted backward or upside down, the key fob circuit won’t have proper electrical flow. Always check that the positive ‘+’ side is facing upward in the compartment.
- Residue buildup – Old leaked battery acid or corrosion in the fob casing can prevent a secure new battery connection. Clean all residue with rubbing alcohol and a cotton swab before inserting a fresh battery.
- Loss of synchronization – Key fobs “sync” with the car’s advanced keyless system. After a battery change, they may fail to reconnect and require a resync procedure.
- Faulty new battery – On rare occasions, brand-new batteries are defective right out of the package. Try replacing it again with a battery from a different pack or brand.
- Underlying key fob issue – In some cases, there may be an antenna, circuit board, or transmitter problem requiring fob repair by a dealership.
Tips for Getting Subaru Key Fob Working Again
If your Subaru key fob stops functioning after changing the battery, there are a number of troubleshooting steps to try:
1. Check proper battery orientation
Ensure the ‘+’ side is facing up in the compartment. If backward, remove and reinsert facing up.
**2. Clean battery contacts and compartment **
Use rubbing alcohol and a cotton swab to remove all residue buildup that could block secure battery connection.
3. Attempt to resynchronize the key fob
Most Subarus resync by pushing the unlock button on the fob next to the Subaru emblem on the car door with keyless access for up to 60 seconds until it reconnects. Refer to the owner’s manual for exact resync instructions.
4. Attempt key fob programming/coding sequence
Many Subarus require a programming sequence using the ignition button after a battery change. Refer to the owner’s manual for programming steps.
5. Test with a new battery from different brand/pack
In rare cases, a defective new battery prevents normal function. Try another new CR2032 battery as a replacement.
6. Have the dealer inspect the key fob for underlying issues
If still not working after the above steps, have Subaru technicians test the fob for antenna/transmitter problems and resolve any underlying faults.
By methodically working through these tips, you should be able to get your Subaru key fob successfully functioning again after a seemingly bad battery change.
Preventing Future Subaru Key Fob Issues
A few best practices will help avoid battery replacement problems in the future:
- Purchase quality lithium CR2032 batteries from reliable brands
- Take care when prying open/assembling the plastic housing
- Have the Subaru dealer replace the battery for you
Protecting the fob components and using quality replacement batteries reduces the risk of running into issues down the road. But even if your key fob fails after changing the battery yourself, this troubleshooting guide outlines steps to get it working again.
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