Circuit Description
DTC B1557 indicates that the option bit portion of the instrument
cluster EEPROM has an unrecoverable error. The option bit portion of the instrument
cluster EEPROM stores the manufacturing information.
Conditions for Setting the DTC
DTC B1557 sets when the instrument cluster detects an error in the option
bit portion of the EEPROM during a diagnostic system self-test.
Action Taken When the DTC Sets
When DTC B1557 sets, the following actions may occur:
| • | The instrument cluster display does not operate. |
| • | The instrument cluster illuminates the SERVICE VEHICLE SOON indicator. |
Diagnostic Aids
| • | The IPC uses default calibrations. |
| • | The OPTIONS NOT SET message is displayed on the driver message
center. |
| • | The manufacturing data and the vehicle identification number are
changed to zero. |
| • | The override display information is set as follows: |
| - | Universal Theft Deterent enable OFF |
| - | Memory/Personalization present OFF |
| - | European Economic Community Mode OFF |
| - | Premium Unleaded Fuel Display disable OFF |
| - | Cellular Telephone present OFF |
| - | Brake to Shift Interlock Message suppression OFF |
| - | Options Not Set Message suppression ON |
| - | Low Fuel Level Message suppression OFF |
| - | Coolant Temp message suppression OFF |
| - | Battery Volts message suppression OFF |
| - | Engine RPM message suppression OFF |
| - | AVG MPH message suppression OFF |
| - | MPH message suppression OFF |
| - | Fuel Used message suppression OFF |
| - | INST MPG message suppression OFF |
