Circuit Description
The control modules on this vehicle monitor vehicle system voltage through the battery positive voltage circuits. Damage to components, and incorrect data can occur when the voltage is out of range. This vehicle has multiple modules that will set this DTC. For more information on which modules refer to Diagnostic Trouble Code (DTC) List - Vehicle
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 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 raises above 16 volts for 1.2 seconds.
Action Taken When the DTC Sets
| • | A message shall be sent out to notify all other modules of high 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 less than 15.5 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. |
Step | Action | Values | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Does the scan tool indicate that DTC B1328 is current in more than one module? | -- | Go to Step 4 | Go to Step 3 |
3 | With a scan tool, observe the Battery Voltage Signal parameter in the body control module (BCM). Does the scan tool indicate that the voltage is greater than the specified value? | 16 V | Go to Step 5 | Go to Charging System Test |
4 | With a scan tool, observe the Battery Voltage Signal parameter in the affected module. Does the scan tool indicate that the voltage is greater than the specified value? | 16 V | Go to Step 5 | Go to Charging System Test |
5 | Replace the affected module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 6 | -- |
6 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
