Control Modules Flash (EEPROM) Programming: Notes

An EEPROM is an E  lectrically E  rasable P  rogrammable R  ead O  nly M  emory chip that is soldered onto the circuit board of a control module. This signifies that programs & data stored on the chip can be electrically erased and replaced with new/revised programs or data.

In order to erase the data on the chip a short duration low level voltage/charge is applied to a pin on the EEPROM and the stored data is erased, hence the name "Flash". Once the data is erased new data is loaded.

By using a this technology, control modules have the ability to be updated a total of 13 times before they need to be replaced.

Theoretically an EEPROM can be erased and reprogrammed more than 13 times, MINI set the number to 13, since a point will be reached where the update being installed may no longer be compatible with the hardware of the installed module which could result in erroneous operation. If the program is not compatible with the hardware version of the module, the program used to determine the correct update for the module will indicate that the module will need to be replaced before the update can be performed.

The reference to Flash programming is a result of the technology used to erase the EEPROM prior to installing a new program and or data.

The utilization of EEPROMs started with Engine Management Systems and has expanded into other control modules.