How do you reset the transmission light in a 1991 Jaguar Sovereign?

To reset the transmission light in a 1991 Jaguar Sovereign, first ensure that the vehicle is in park or neutral. Disconnect the battery for about 10-15 minutes to reset the electronic control module. After reconnecting the battery, start the vehicle and check if the transmission light has turned off. If it remains illuminated, it may indicate a persistent issue that requires further diagnosis.