Circuit Description

BCM calibrations are stored in Electronically Erasable Programmable Read Only Memory (EEPROM). When ignition switch is first turned to RUN position, BCM performs internal tests on EEPROM and determines integrity of its non-volatile memory. BCM will also compare the present checksum with the checksum previously stored.

DTC B0605 will set when stored checksum does not match calculated checksum, or when an internal memory malfunction (checksum error) is detected by BCM when ignition switch if first turned to RUN position. No driver warning message will be displayed.

If conditions for malfunction no longer exist, history DTC will clear after 100 consecutive ignition cycles. DTC B0605 will also clear when conditions no longer exist or when scan tool is used to clear codes.