For 1990-2009 cars only
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:
- Clear the DTC with a scan tool.
- Cycle the ignition switch.
- If DTC B1556 is still current, replace the BCM. Refer to Body Control Module Replacement .
