Circuit Description
The instrument panel cluster (IPC) uses no external circuits for the operation that sets this DTC. The IPC stores 3 redundant copies of the vehicle odometer mileage within the electrically erasable programmable read-only memory (EEPROM). The 3 EEPROM mileage records stored mileage records must agree.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B1556 EEPROM Odometer/Configuration
Conditions for Running the DTC
The diagnostic test is performed once every 0.3 seconds during normal running mode and service diagnostics mode.
Conditions for Setting the DTC
The 3 redundant copies of the vehicle odometer mileage within the EEPROM do not agree.
Action Taken When the DTC Sets
| • | The IPC displays the word ERROR in the odometer display |
| • | The odometer will not operate. |
| • | The trip odometer is not affected. |
Conditions for Clearing the DTC
| • | A current DTC clears when the malfunction is no longer present. |
| • | A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction. |
Diagnostic Aids
| • | This DTC may be stored as a history DTC with out affecting the operation of the module. If stored only as a history DTC and not retrieved as a current DTC, do not replace the module. |
| • | This DTC will never set as current during testing unless there is a non-recoverable memory failure. |
| • | Intermittent interruptions to either the Hot At All Times supply or the processor ground will cause the module to set the DTC. |
| • | If this DTC is retrieved as both a current and history DTC, replace the module. |
Step | Action | Yes | No |
|---|---|---|---|
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Is the DTC retrieved as a current DTC? | Go to Step 3 | Go to Diagnostic Aids |
3 | Replace the control module setting the DTC as current. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 4 | -- |
4 |
Does the DTC reset? | Go to Step 2 | System OK |
