B1325
DTC B1325
Circuit Description
The body control module (BCM) monitors the battery voltage through the battery voltage signal circuit. Refer to Body Control System Schematics.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B1325 Device Power 1 Circuit Voltage
Conditions for Running the DTC
The voltage supplied to the BCM is in the range of 7-26 volts.
Conditions for Setting the DTC
B1325 Type 03
* The BCM detects a system voltage below 9 volts.
* The above condition is present at least 5 seconds.
B1325 Type 07
* The BCM detects a system voltage above 18 volts.
* The above condition is present at least 5 seconds.
Action Taken When the DTC Sets
* The BCM immediately disables all outputs when a high voltage condition was detected, with the exception of GMLAN and Run/Crank relay that are disabled after a 3 minutes 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.
Diagnostic Aids
* The following may cause an intermittent:
- A damaged terminal
- A backed out terminal
- A poor terminal tension
- A chafed wire
- A broken wire inside the insulation
* When diagnosing an intermittent short or an open, manipulate the wire harness while watching the test equipment for changes.
Test
