For 1990-2009 cars

### Removal Procedure

1. Insert a coin into the slot on the battery access cover on the back of the transmitter.
2. Turn the coin counterclockwise to remove the transmitter rear cover.
3. Remove the battery.

### Installation Procedure

Important: Use the proper battery size or damage to the transmitter may result.

1. Install a GM P/N 90541381 battery type or equivalent.
2. Install the transmitter rear cover.
3. Test the transmitter operation.