DTC B1009: EEPROM Checksum Mismatch Performance: Notes

The On-Star Communication Interface Module (CIM) performs an internal Electronic Erasable Programmable Read Only Memory (EEPROM) checksum as a part of its internal diagnostics as the CIM is initialized on start up. If the check sum does not match the predetermined value, this DTC will fail. If the condition corrects its self on the next power up the DTC will clear.