DTC B1328 Device Power Circuit High. Cadillac DeVille 2000

For 1990-2009 cars only

Makes 🢒 Cadillac 🢒 2000 🢒 DeVille 🢒 Body and Accessories 🢒 Body Control System 🢒 DTC B1328 Device Power Circuit High

Engine Electrical Components
Generator and Battery
Serial Data Class 2 (1 of 3)
Handling ESD Sensitive Parts Notice
Rear Fuse Block Battery Voltage
G300, G303, G304, G306

Circuit Description

The Dash Integration Module (DIM) has a designated circuit for monitoring vehicle system voltage. Also, other modules monitor system voltage. The DIM sends the system voltage status to other modules that do not monitor system voltage via Class 2 message. When the DIM sets B1390, the system voltage status sent to the modules will default to 12.9 Volts.

Conditions for Running the DTC

The ignition switch is not in the OFF or CRANK mode.

Conditions for Setting the DTC

This DTC will set as current when the voltage is greater than 15.9 volts for 1.2 seconds and DTC B1390 is not set current in the DIM.

Action Taken When the DTC Sets

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 the ON-Board clearing DTCs feature.

•	Use a scan tool.

Diagnostic Aids

The following conditions are independent of the DTC, but will occur with the DTC set current.

•	The battery charge indicator is illuminated on the instrument cluster.

•	The BATTERY VOLTS HIGH message is displayed on the driver information center (DIC).

Test Description

The numbers below refer to the step numbers on the diagnostic table.

Tests for the proper voltage at the DIM. If the voltage is not within the proper operating range, the charging system needs to be checked.

Tests for the proper voltage at the module setting the DTC B1328. If the voltage is not within the proper operating range, the charging system needs to be checked.

Step	Action	Value(s)	Yes	No
1	Did you perform the Starting and Charging Diagnostic System Check?	--	Go to Step 2	Go to Diagnostic System Check - Engine Electrical
2	Install a scan tool. Turn ON the ignition, with the engine OFF. With a scan tool, observe the battery voltage parameter in the Dash Integration Module (DIM) data list. Does the scan tool indicate the battery voltage is less than specified value?	15.5 Volts	Go to Step 3	Go to Step 4
3	With a scan tool, observe the battery voltage parameter in the data list of the module setting the DTC B1328. Does the scan tool indicate the battery voltage is less than specified value?	15.5 Volts	Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems	Go to Step 5
4	Turn OFF the ignition. Disconnect the DIM harness connector. Turn ON the ignition, with the engine OFF. Measure the voltage between the voltage sense circuit of the DIM and the ground sense circuit of the DIM. Does the voltage measure less than specified value?	15.5 Volts	Go to Step 6	Go to Charging System Test
5	Turn OFF the ignition. Disconnect the harness connector of the module setting the DTC B1328. Turn ON the ignition, with the engine OFF. Measure the voltage between the battery positive voltage circuit of the module setting the DTC 1328 and the ground circuit of the module setting the DTC B1328. Does the voltage measure less than specified value?	15.5 Volts	Go to Step 6	Go to Charging System Test
6	Important: Perform the setup procedure for the module setting the code, if necessary. Replace the module setting the code. Refer to the appropriate Repair Instructions for module replacement. Did you complete the replacement?	--	Go to Step 7	--
7	Use the scan tool in order to clear the DTCs. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text. Does the DTC reset?	--	Go to Step 2	System OK