DTC B1390 Device Voltage Reference Input CKT Malf. Cadillac Seville 2000

For 1990-2009 cars only

Makes 🢒 Cadillac 🢒 2000 🢒 Seville 🢒 DTC 🢒 DTC B1390 Device Voltage Reference Input CKT Malf

Refer to

DIM Power and Ground

Body Control Module Components
Body Control System Circuit Description
DIM Ignition Inputs
Handling ESD Sensitive Parts Notice
IGN SW, HTDST LR, HTDST RR, and HTDST RF Fuses
IGN SW, HTDST LR, HTDST RR, and HTDST RF Fuses
Class 2 Serial Data Line (LH Drive)
G201 (Partial)

The DIM has an internal battery voltage sensor and a reference voltage. The DIM compares these two voltages via the battery positive voltage circuit and the voltage sense circuit every 500 milliseconds.

Conditions for Running the DTC

This DTC will run only if the DIM has power and ground. This DTC will execute regardless of the source voltage.

Conditions for Setting the DTC

This DTC shall be set after 2 consecutive reads that the battery positive voltage and the voltage sense circuits differ by 1 volt or greater.

Action Taken When the DTC Sets

All writes to the EEPROM will be suspended. All loss of communication and low/high voltage DTC codes are suspended.

Conditions for Clearing the MIL/DTC

In order to clear the DTC from a current status, the two voltages will differ less than 1 volt for 2 consecutive reads.

Step

Action

Value(s)

Yes

Did you perform the Diagnostic System Check - Engine Electrical?

Go to Step 2

Go to Diagnostic System Check - Engine Electrical in Engine Electrical

Turn OFF the ignition.
Disconnect the dash integration module (DIM).
Turn ON the ignition, with the engine OFF.
Measure and record the voltage of the DIM battery positive voltage circuit and the DIM voltage sense circuit to ground.
Compare the two recorded voltages.

Is the voltage difference less than the specified value?

1 V

Go to Step 5

Go to Step 3

Test the following DIM circuits for a high resistance or an open:

•	battery positive voltage circuit

•	voltage sense circuit

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 7

Go to Step 4

Test both DIM ground circuits for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 7

Go to Step 5

Inspect for poor connections at the harness connector of the DIM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 7

Go to Step 6

Important:: After replacement of the DIM perform the set up procedure for the DIM. Refer to Body Control Module (BCM) Programming/RPO Configuration .

Replace the DIM. Refer to Dash Integration Module Replacement .

Did you complete the replacement?

Go to Step 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