DTC B0856: Dirty Battery Failure: Description
WARNING: This page is about a different car, the 1998 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
Memory Seat Module (MSM) is supplied battery voltage from SEATS circuit breaker (30-amp) in left maxi-fuse block using circuit No. 742 (Red wire). This battery voltage is used to operate seat motors. DTC B0856 will set when battery voltage falls out of range of 9-15.5 volts. DTC B0856 will clear when dirty battery voltage is within a valid operating range during the last monitoring cycle.