B1327

DTC B1327

CIRCUIT DESCRIPTION
The body control module (BCM) monitors vehicle system voltage. Also, other modules monitor system voltage. The BCM sends a system voltage message to other modules that do not monitor system voltage via class 2 message.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC B1327 Device Power 1 Low

CONDITIONS FOR RUNNING THE DTC
This DTC shall run only if the 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
- This DTC shall be set as current when the voltage falls below 9.0 volts for 1.2 seconds.
- When the vehicle exits START the module 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 notify all other modules of low 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 a scan tool.

TEST

Steps 1-11:

Step 12: