The body control module (BCM) has an internal voltage sensor with a dedicated circuit that checks the battery positive voltage and battery negative circuit voltage to determine if it is below 15.5 volts.
This diagnostic procedure supports the following DTC:
DTC B1328 Device Power 1 Circuit High
This DTC shall run only if the BCM has power, ground, and the ignition is not in START mode. This DTC shall execute regardless of the battery voltage.
This DTC shall be set as current when the voltage raises above 16.5 volts for 1,200 milliseconds.
• | A message shall be sent out on the class 2 lines to notify all other modules of high battery voltage. |
• | This DTC shall be set as current when the voltage raises above 17 volts for 1,200 milliseconds. |
• | The modules disable the setting of U codes and other DTCs. |
In order to clear the DTC from a current status, the ignition must be cycled and the voltage shall be less than 17 volts.
The number below refers to the step number on the diagnostic table.
Step | Action | Value(s) | Yes | No |
---|---|---|---|---|
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |
2 |
Does the scan tool indicate the battery voltage is less than the specified value? | 17 V | Go to Step 4 | Go to Step 3 |
Are the voltages within the specified value? | 1 V | Go to Charging System Test | Go to Step 4 | |
4 | Inspect for poor connections at the harness connector of the body control module (BCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 6 | Go to Step 5 |
5 |
Important: Perform the setup procedure for the BCM. Replace the BCM. Refer to Control Module References 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 |