The GPS module stopped working after updating the map.

Follow these steps if you are unable to use the GPS feature on the car stereo after updating the map on the GPS module:

1. Turn off the GPS module
2. Disconnect the GPS module from the head unit and reconnect it.
3. Remove the memory card from the GPS module and re-insert it.
4. Turn on the GPS module.
5. Start the navigation function. 

IMPORTANT: If the issue is not resolved after following the steps, follow the retry updating the map again.