Circuit Description
The BCM has an internal voltage sensor that monitors the battery voltage to determine if it is below 18.5 volts.
Conditions for Running the DTC
This DTC shall run only if no communication codes are set.
Conditions for Setting the DTC
The ignition positive voltage level is greater than 18.5 volts for approximately 5 seconds or more.
Action Taken When the DTC Sets
The BCM sets DTC B1328 and disables the setting of all other BCM DTCs.
The dome light, PWM Dim, SEC, Telltale and chime are disabled.
Conditions for Clearing the DTC
| • | The battery positive voltage level is less than 17.9 volts for approximately 1/2 seconds. |
| • | A history DTC clears after 100 malfunction free ignition cycles. |
| • | The BCM receives the clear code command from the scan tool. |
Diagnostic Aids
This DTC may set when the vehicle is placed on a battery charger, on fast charge, for a long period of time.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Body Control System Schematics in Body Control System | ||||
1 | Did you perform the Engine Electrical Diagnostic System Check? | -- | Go to Step 2 | |
2 |
Does the scan tool indicate the battery voltage is greater than the specified value? | 18.5 volts | Go to Step 3 | Go to Step 4 |
3 | Measure the voltage across the battery terminals. Is the battery voltage greater than the specified value? | 18.5 volts | Go to Generator Replacement | Go to Step 4 |
4 |
Important: Perform the setup procedure for the BCM. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System. Replace the BCM. Refer to Body Control Module Replacement in Body Control System. Did you complete the replacement? | -- | Go to Step 5 | -- |
5 |
Does the DTC reset? | Go to Step 2 | System OK | |
