Engine Electrical

DTC B1328

CIRCUIT DESCRIPTION
The body control module (BCM) has an internal voltage sensor with a dedicated circuit that checks the battery positive voltage and battery negative circuit voltage to determine if it is below 15.5 volts.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC B1328 Device Power 1 Circuit High

CONDITIONS FOR RUNNING THE DTC
This DTC shall run only if the BCM 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
This DTC shall be set as current when the voltage raises above 16.5 volts for 1,200 milliseconds.

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.
- This DTC shall be set as current when the voltage raises above 17 volts for 1,200 milliseconds.
- The modules disable the setting of U codes and other DTCs.

CONDITIONS FOR CLEARING THE MIL/DTC
In order to clear the DTC from a current status, the ignition must be cycled and the voltage shall be less than 17 volts.

TEST DESCRIPTION

Step 1 - Step 6:

The number below refers to the step number on the diagnostic table.
3. This step compares battery voltage with the voltage that the BCM calculates.