B1983

CIRCUIT DESCRIPTION
The BCM and IPC monitor their input voltages to determine if it is above 9.0 V.

The ACM, IRC, MMM, MSM, and PHN receive a class 2 message from the BCM notifying these modules of high system voltage.

CONDITIONS FOR RUNNING THE DTC
This DTC shall run only if the setting module has power, ground and the ignition is not in START mode. This DTC shall execute regardless of the battery voltage.

CONDITIONS FOR SETTING THE DTC
DTC B1982 sets when the battery voltage drops below 9.0 volts.

ACTION TAKEN WHEN THE DTC SETS
^ A message shall be sent out on the class 2 lines to notify all other modules of high battery voltage.
^ The modules disable the setting of U codes and other DTCs.

CONDITIONS FOR CLEARING THE DTC
^ The DTC will clear current status when the voltage is greater than 9.5 volts for 1.2 seconds.
^ A history DTC will clear after 50 consecutive ignition cycles if the condition for the malfunction is no longer present.
^ Use the ON-Board clearing DTCs feature.
^ Use a scan tool.

DIAGNOSTIC AIDS

IMPORTANT: If DTC B1982 is set as current in the ACM, IRC, MMM, MSM, or PHN use the table to diagnose the BCM.

TEST DESCRIPTION

Steps 1-9:

The numbers below refer to the step numbers on the diagnostic table.
3. Tests for the proper operation of the complete circuit.
4. Tests for the proper operation of the battery positive voltage circuit.