See also:

Battery replacement
CAUTION: Be careful not to allow children to swallow the battery or removed parts. ...

Reporting safety defects (US only)
If you believe that your vehicle has a defect which could cause a crash or could cause injury or death, you should immediately inform the National Highway Traffic Safety Administration (NHTSA) ...

Programming trouble-diagnosis
If the HomeLink does not quickly learn the handheld transmitter information: ● replace the hand-held transmitter batteries with new batteries. ● position the hand-held transmitter with ...