B0605

DTC B0605 BCM Internal Memory Malfunction:

CIRCUIT DESCRIPTION
The Body Control Module (BCM) calibrations are stored in the 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 current.

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

ACTION TAKEN WHEN THE DTC SETS
^ Stores a DTC B0605 in the BCM memory.
^ No driver warning message will be displayed for this DTC.

CONDITIONS FOR CLEARING THE DTC
^ The BCM no longer detects an internal memory malfunction condition (checksum error).
^ 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
^ Since the EEPROM is n0t removable from the BCM module and a DTC B0605 is an internal malfunction to the BCM. There is no repair procedure for this malfunction and module replacement is necessary. A service replacement BCM must be programmed and configured to the vehicle that is receiving the installation. Using a scan tool, make sure the BCM is properly programmed and configured for the correct PASS-Key (R) II and option content for that vehicle. Refer to New BCM Setup.

TEST DESCRIPTION
Numbers below refer to the step numbers on the diagnostic table.
1. Always perform the BCM Diagnostic System Check before attempting to diagnose a DTC B0605.
2. This repair procedure requires BCM replacement.
3. Always clear DTCs after repair procedure is complete.