Circuit Description
A DTC B1552 indicates that the keep alive or the long term memory in the Body Control Module (BCM) is reset. It is a normal occurrence whenever the power or the ground is removed from the BCM. For example: anytime the battery is disconnected and reconnected.
Conditions for Setting the DTC
| • | A loss of battery input to the BCM. |
| • | A loss of ground to the BCM. |
Action Taken When the DTC Sets
The BCM memory resets Keep Alive Memory (KAM) to initial default values.
Conditions for Clearing the DTC
| • | The conditions for the fault are no longer present. |
| • | A history DTC will clear after 50 consecutive ignition cycles if the condition for the fault is no longer present. |
Diagnostic Aids
Check the following if DTC B1552 sets without a battery disconnect:
| • | Battery and battery terminal condition |
| • | Good terminal contact at battery positive voltage |
| • | Good terminal contact at BCM ground |
| • | A good clean and tight connection at the body ground connection. |
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Body Control System Schematics | |||
1 | Did you perform the Diagnostic System Check for the system exhibiting the symptom? | Go to Step 2 | Go to Diagnostic System Check for the system exhibiting symptoms |
2 | Is the DTC retrieved current? | Go to Step 3 | Go to Diagnostic Aids |
3 |
Important: Perform the set up procedure for the Body Control Module (BCM). Replace the BCM. Refer to Body Control Module Replacement . Did you complete the replacement? | System OK | -- |
