For 1990-2009 cars only
Circuit Description
The Sensing and Diagnostic Module (SDM) learns the source ID of the battery voltage report message. The SDM monitors this message every 300 milliseconds.
Conditions for Running the DTC
The SDM monitors the Class 2 serial data line during CONTINUOUS MONITORING for the battery voltage report.
Conditions for Setting the DTC
The battery voltage report indicates the battery voltage is below 9.5 volts and CRANK mode is not active.
Action Taken When the DTC Sets
The SDM sets DTC B1327 and disables the State Of Health (SOH) DTCs U1064, U1096, U1255, U1300, and U1301.
Conditions for Clearing the MIL/DTC
The SDM receives a battery voltage report message that the battery voltage is above 9.5 volts.
Diagnostic Aids
Refer to Charging System Check to diagnose a vehicle undercharging condition.
