Circuit Description
The driver door module (DDM) performs internal tests on the EEPROM each time that the DDM performs a write function to a memory address in the EEPROM. The DDM reads back the data that has been written and compares the data to the memory data. If the data does not match after 3 consecutive write and verify attempts, the DDM will indicate that a write malfunction is current.
Conditions for Setting the DTC
| • | The data read back after a write does not match the data being written 3 consecutive times. |
| • | The DDM detects an internal write malfunction. |
| • | The condition must occur when data is being written. |
Action Taken When the DTC Sets
| • | DTC B1656 is stored in the DDM memory. |
| • | No driver warning message is displayed for this DTC. |
| • | The DDM stores the value being written in another memory address in the EEPROM. |
Conditions for Clearing the DTC
| • | This DTC requires a successful write in order to change from current to history. |
| • | The DDM no longer detects an internal write malfunction. |
| • | A history DTC clears after 50 consecutive ignition cycles if the condition for the malfunction is no longer present. |
| • | Use a scan tool. |
Diagnostic Aids
As DTC B1565 is an internal DDM malfunction, and the EEPROM cannot be removed from the DDM, the DDM may need to be replaced. Refer to the diagnostic table.
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
-
Perform the Power Door Diagnostic System Check prior to diagnosing DTC B1656.
-
Clear all DTCs and cycle the ignition in order to verify that the DTC is set correctly.
-
Clear any DTCs after completing the repair procedure.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Did you perform the Power Door Diagnostic System Check? | -- | Go to Step 2 | ||
Is the DTC still present? | -- | Go to Step 3 | ||
3 | Replace the DDM. Refer to Front Door Module Replacement . Did you complete the repair ? | -- | Go to Step 4 | -- |
Are all the DTCs cleared? | -- | -- |
