• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
B+ | B1325 03 | B1325 03 | -- | -- |
Ground | -- | B1325 03 | -- | -- |
The control modules on this vehicle monitor the battery voltage through the battery positive (B+) voltage circuits. The following control modules will set this DTC:
• | Body control module (BCM) |
• | Instrument panel cluster (IPC) |
• | Radio |
• | Sensing and diagnostic module (SDM) |
The battery voltage supplied to the control modules is in the range of 7-26 volts.
The control module detects a system voltage less than 9 volts for 5 seconds.
The control module detects a system voltage greater than 18 volts for 5 seconds.
• | The control module immediately disables all outputs when an out of range voltage condition has been detected, with the exception of GMLAN and the Run/Crank relay, which are disabled after a 3 minute delay. |
• | The setting of other DTCs is inhibited. |
The DTC passes when the malfunction is no longer present.
• | A high or low voltage value in multiple modules indicates a concern in the charging system. |
• | Overcharging with a battery charger or jump starting can cause this DTC to set. |
• | This DTC may set if the battery is disconnected for any reason. |
Charging System Description and Operation
Control Module References for scan tool information
⇒ | If not within the specified range, refer to Charging System Test. |
Warning: Refer to SIR Warning in the Preface section.
• | Terminal 6 (IPC) |
• | Terminal 31 (SDM) |
• | Terminal 8 X1 (Radio) |
• | Terminal E12 X4 (BCM) |
⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
• | Terminal 1 (SDM) |
• | Terminal 14 (IPC) |
• | Terminal 1 X1 (Radio) |
• | Terminal D12 X3 (BCM) |
⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for the appropriate module replacement, setup, and programming