B0605

DTC B0605 BCM Internal Memory Malfunction:

CIRCUIT DESCRIPTION
The Body Control Module (BCM) stores calibrations in an EEPROM (Electronically Erasable Programmable Read Only Memory). When the ignition switch is first turned to RUN, the BCM performs internal tests on the EEPROM and can determine the integrity of its non-volatile memory. The BCM compares its previously stored checksum with checksum calculated when the ignition switch is first turned to RUN. If the two checksums do not match, the BCM will indicate a calibration malfunction (checksum error) is present. If the two checksums do not match, the BCM will indicate a calibration malfunction (checksum error) is present.

CONDITIONS FOR SETTING THE DTC
^ The stored checksum does not match the calculated checksum.
^ The BCM detects an internal memory (checksum error) malfunction.
^ Condition must occur when ignition switch is first turned to the RUN position.

ACTION TAKEN WHEN THE DTC SETS
The BCM stores DTC B0605 in memory.

CONDITIONS FOR CLEARING THE DTC
^ The BCM no longer detects an internal memory (checksum error) malfunction.
^ A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.
^ Using a scan tool.

DIAGNOSTIC AIDS
DTC B0605 is related to an internal malfunction of the EEPROM in the BCM. The EEPROM is not removable from the BCM; therefore, replace the BCM. A service replacement BCM must be programmed and configured to the vehicle. Using a scan tool, make sure the BCM is properly programmed and configured for the correct PASS-Key(R) II and vehicle option content. Refer to Setup New BCM for more information.

TEST DESCRIPTION
Number below refer to the step number on the diagnostic table.
2. Determines whether the condition is intermittent or the BCM is faulty.