DTC B1552, Loss Of BCM Keep Alive Memory (KAM)
DTC B1552 indicates keep alive memory or long term memory has been reset. Keep alive memory or long term memory will reset when power or ground is removed from BCM. This is a normal occurrence when battery is disconnected and reconnected. When DTC B1552 is set, BCM memory is reset to initial values. BCM will initialize keep alive memory contents to default the following:
- Controlled Power Timer - Set To Full Time
- Low Power State - Set To Unknown
- Power Down Hours - Clear
- Key Cylinder State - Inactive
- Class 2 Bus State - Unknown
- Driver Door Jamb - Closed
- Other Doors Jamb - Closed
- Ignition State - Current State
If DTC B1552 is set and battery was not disconnected, check for poor connections at BCM 24-pin, connector C1, terminal B03 (Red wire) and BCM 32-pin, connector C2, terminal C01 (Black wire).