B1552 Loss of BCM Keep Alive Memory

Diagnostic Trouble Code Chart:

Wiring Schematic:

CIRCUIT DESCRIPTION
The body control module (PZM) contains a data storage area which can save pertinent data when the ignition is turned OFF. The Keep Alive Memory (KAM) data is lost if battery power is removed from the PZM.

CONDITIONS FOR SETTING THE DTC
DTC B1552 indicates that the KAM has been reset. This is a normal occurrence whenever power or ground is removed from the PZM, such as during a battery disconnect.

ACTION TAKEN
The PZM memory is reset to the initial values. The PZM sets the following defaults:
^ Fuel Level: Empty
^ Afterblow Mode: Disable
^ Afterblow Alarm: Disable
^ Controlled Power Timer: Set to Full Time
^ Power Down Hours: Clear
^ Storage Mode State: Disable
^ Key Cylinder State: Inactive
^ Driver Door Jamb: Closed
^ Other Doors Jamb: Closed
^ Ignition State: Current State

CONDITIONS FOR CLEARING THE DTC
^ This DTC requires an ignition cycle in order to change to history.
^ The PZM no longer detects the condition.
^ A history code clears after 50 ignition cycles, the condition is no longer present.

DIAGNOSTIC AIDS
If DTC B1552 sets without a battery disconnect, inspect the terminal contacts at PZM connector C1 terminal A12 and terminal B1.