Circuit Description
Each control module runs a program to detect internal memory faults. No external circuits are involved. If a control modules keep alive memory (KAM) has been reset, that control module may set DTC B1004. It is a normal occurrence when battery positive voltage or ground is removed from the module, such as during a battery disconnect.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B1004 Keep Alive Memory (KAM) Reset
Conditions for Running the DTC
| • | The control module has power and ground. |
| • | The control module is active/awake. |
Conditions for Setting the DTC
The KAM in the control module has been reset.
Action Taken When the DTC Sets
The control module reverts back to the base programmed critical operating data until new data is learned and stored in KAM.
Conditions for Clearing the DTC
| • | A current DTC clears when the ignition is cycled, and the malfunction is no longer present. |
| • | A history DTC clears when the ignition has been cycled 100 times without a repeat of the malfunction. |
Diagnostic Aids
| • | DTC B1004 may be stored as a history DTC without 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. |
| • | DTC B1004 is retrieved as both a current and history DTC, replace the control module. |
Step | Action | Yes | No |
|---|---|---|---|
1 | Did you perform the Diagnostic System Check for the system exhibiting the symptom? | Go to Step 2 | Go to Control Module References for the applicable Diagnostic System Check |
2 |
Is DTC B1004 retrieved as a current DTC? | Go to Step 3 | Go to Diagnostic Aids |
3 |
Important: Perform the programming or setup procedure for the module, if required. Replace the control module setting DTC B1004 as current. Refer to Control Module References . Did you complete the replacement? | Go to Step 4 | -- |
4 |
Does DTC B1004 reset? | Go to Step 2 | System OK |
