B1327
DTC B1327
CIRCUIT DESCRIPTION
The body control module (BCM) and onstar module (ONS) monitor the battery voltage to determine if it is between 9.0-15.9 volts.
DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC B1327 Device Power 1 Circuit Low
CONDITIONS FOR RUNNING THE DTC
This DTC shall run only if the BCM and ONS have power, ground and the ignition in not in START mode. This DTC shall execute regardless of the battery voltage, except when the DTC B1390 is set current.
CONDITIONS FOR SETTING THE DTC
- This DTC shall be set as current when the voltage falls below 9.0 volts for 1200 milliseconds.
- When the vehicle exits START the BCM and ONS shall delay checking the voltage for 2 seconds.
ACTION TAKEN WHEN THE DTC SETS
A message shall be sent out on the class 2 lines to illuminate the charge indicator lamp.
CONDITIONS FOR CLEARING THE MIL/DTC
In order to clear the DTC from a current status the voltage shall be greater than 9.54 volts for 1200 milliseconds.
TEST
