Tools
- Plastic pry tool or documented mechanical key
- Clean dry cloth
Replace a key-fob battery
Renew the fob battery without damaging the case or losing the mechanical key.
5–15 min2 toolselectrical
Parts and supplies
- Exact battery chemistry and size printed in the manual or old cell
Before starting
- A working spare key is available when practical
- Replacement battery polarity is understood
One step at a time
Realistic views show the component and hand action for each step. Exact layout varies by vehicle, so always confirm access in the applicable manual.
STEP 1
Remove the mechanical key
Operate the documented latch and place the mechanical key safely aside.
CheckpointThe latch moves freely and no emergency key is lost.
STEP 2
Open at the service notch
Use the documented notch and a plastic tool to separate the case without twisting circuit components.
CheckpointCase clips release without cracking.
STEP 3
Match and install the cell
Record polarity, remove the old cell and install the exact replacement in the same orientation.
CheckpointThe cell is fully seated and contacts are not bent.
STEP 4
Close and test
Snap the case evenly, reinstall the key and test lock/unlock plus the documented backup start position.
CheckpointButtons work and the case seam is fully closed.
Post-repair verification
- Remote functions work
- Vehicle recognizes the key
- Old coin cell is recycled safely