Circuit Description
The season odometer, which keeps track of vehicle mileage, is stored in Instrument Cluster (IPC) EEPROM. The IPC is capable of displaying up to 999999 km (621,500 miles), depending on the units selected. Extensive security measures are incorporated into the IPC in order to prevent corruption of odometer values.
Conditions for Setting the DTC
DTC B1556 sets if the odometer portion of the IPC EEPROM has an unrecoverable error and is no longer accurate.
Action Taken When the DTC Sets
| • | DTC B1556 is stored in IPC memory. |
| • | The IPC displays ERROR in place of the mileage on the season odometer whenever this DTC is current. |
Conditions for Clearing the DTC
| • | DTC B1556 clears (status changes from current to history) when the IPC no longer detects the conditions which caused the DTC to set. |
| • | A history DTC clears after 50 consecutive ignition cycles if the condition for the malfunction is no longer present. |
| • | Current and history DTCs may be cleared using a scan tool or using the IPC on-board clearing DTCs feature. |
Diagnostic Aids
Clear the DTC. If the DTC resets as current, replace the IPC. To obtain an approximate mileage, refer to the most recent service information and contact an authorized service center. The service center may use the failed IPC to obtain the approximate odometer data for the replacement IPC.
Test Description
The numbers below refer to the step numbers on the diagnostic table:
-
Perform the Instrument Cluster Diagnostic System Check before continuing with the diagnosis of this DTC.
-
Clear all DTCs and cycle ignition to check that the DTC did not falsely set.
-
Clear all DTCs after the repair procedure is complete.
Step
| Action | Value(s) | Yes | No |
|---|---|---|---|---|
Was the Instrument Cluster Diagnostic System Check performed? | -- | |||
Is the DTC still present? | -- | System OK | ||
3 | Replace the IPC. Refer to Instrument Cluster Replacement . Is the module replacement complete? | -- | -- | |
Are all DTCs cleared? | -- | -- |
