Starting and Charging Diagnosis
DTC B1325
CIRCUIT DESCRIPTION
The control modules on this vehicle monitor the battery voltage through the battery positive voltage circuits.
DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC B1325 Device Power 1 Circuit
This vehicle has DTCs that include DTC symptoms. For more information on DTC symptoms, refer to DTC Symptom Description in Vehicle DTC Information. DTC Symptom Description
CONDITIONS FOR RUNNING THE DTC
The voltage supplied to the control modules is in the range of 7-26 volts.
CONDITIONS FOR SETTING THE DTC
B1325 03
The control module detects a system voltage below 9 volts and the condition is present at least 5 seconds.
B1325 07
The control module detects a system voltage above 18 volts and the condition is present at least 5 seconds.
ACTION TAKEN WHEN THE DTC SETS
- The control module immediately disables all outputs when a high voltage condition is detected, with the exception of GMLAN and Run/Crank relay that are disabled after a 3 minute delay.
- The setting of other DTCs is inhibited.
CONDITIONS FOR CLEARING THE DTC
- A current DTC clears when the malfunction is no longer present.
- A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction.
TEST
