B1556

CIRCUIT DESCRIPTION
DTC B1556 is an internal Body Control Module (BCM) fault.

CONDITIONS FOR SETTING THE DTC
The BCM performs a data check on every EEPROM write. The BCM sets this fault if the data does not match after three consecutive attempts.

ACTION TAKEN WHEN THE DTC SETS
Stores a DTC B1556 in the BCM memory.

CONDITIONS FOR CLEARING THE DTC
^ The conditions for the fault are no longer present.
^ The use of the scan tool.
^ A history DTC will clear after 50 consecutive ignition cycles if the condition for the fault is no longer present.

DIAGNOSTIC AIDS
Perform the following steps if DTC B1556 is set:
1. Clear the DTC with a scan tool.
2. Cycle the ignition switch.
3. If DTC B1556 is still current, replace the BCM.