2009 Subaru Outback Owner's Manual - Page 104

2-12 Keys and doors To replace the battery: 1. Remove the screw on the key head. 3. Remove the transmitter case from the key head. 1) Negative (−) side facing up 5. Replace the old battery with a new battery (Type CR1620 or equivalent) making sure to install the new battery with the negative (−) side facing up. 6. Put together the transmitter case by fitting the hooks on the case. 7. Reinstall the transmitter case in the key head. 8. Reinstall the screw on the key head. After the battery is replaced, the transmitter must be synchronized with the remote keyless entry system's control unit. Press either the " " or " " button six times to synchronize the unit. 2. Open the key head using a flat-head screwdriver. 4. Open the transmitter case by releasing the hooks.