Buick Regal: DTC B3883
Diagnostic Instructions
- Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
- Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
- Diagnostic Procedure Instructions provides an overview of each
diagnostic category.
DTC Descriptor
DTC B3883 02
License Plate Lamp Circuit Short to Ground
Diagnostic Fault Information
1. Park, License, and/or Tail Lamps Malfunction
Circuit/System Description
When the turn signal/multifunction switch is placed in the HEAD or PARK
position, ground is applied
to the park lamp switch ON signal circuit to the body control module (BCM). The
BCM responds by
applying voltage to the park lamps, tail lamps, and license lamps control
circuits illuminating the park,
tail, and license lamps.
Conditions for Running the DTC
- Battery voltage must be between 9-16 V.
- Turn signal/multifunction switch in AUTO, PARK or ON positions.
Conditions for Setting the DTC
The BCM detects a short to ground in the license plate lamps control circuit.
Actions Taken When the DTC Sets
License plate lamps inoperative.
Conditions for Clearing the DTC
- The condition responsible for setting the DTC no longer exists.
- A history DTC will clear once 100 consecutive malfunction-free ignition
cycles have occurred.
Reference Information
Schematic Reference
Exterior Lights Wiring Schematics
Connector End View Reference
COMPONENT CONNECTOR END VIEWS - INDEX
Description and Operation
Exterior Lighting Systems Description and Operation
Electrical Information Reference
- Circuit Testing
- Connector Repairs
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
Scan Tool Reference
Control Module References for scan tool information.
Circuit/System Testing
License Plate Lamps Malfunction
1. Ignition OFF, exterior lamps OFF, disconnect the appropriate E7 License
Plate Lamp. It may take
up to 2 min for all vehicle systems to power down.
2. Test for less than 10 Ω between each ground circuit at the socket terminal
and ground.
- Ignition OFF.
- Test for less than 2 Ω in the ground circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, repair the open/high resistance in the ground
connection.
- Go to next step: If less than 10 Ω
3. Connect a test lamp between the control circuit at the socket terminal and
ground, ignition ON.
4. Verify the test lamp turns ON and OFF when commanding the License Plate Lamps
ON and OFF
with a scan tool.
- If the test lamp is always OFF
- Ignition OFF, disconnect the X4 harness connector at the K9 Body Control
Module.
- Test for infinite resistance between the control circuit and ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- Go to next step: If infinite resistance
- Test for less than 2 Ω in the control circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, replace the K9 Body Control Module.
- If the test lamp is always ON
- Ignition OFF, disconnect the X4 harness connector at the K9 Body Control
Module, ignition
ON.
- Test for less than 1 V between the control circuit terminal and ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- If less than 1 V, replace the K9 Body Control Module.
- Go to next step: If the test lamp turns ON and OFF
5. Test or replace the appropriate E7 License Plate Lamp.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
- Rear License Plate Lamp Replacement
- Control Module References for BCM replacement, programming, and setup
READ NEXT:
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
SEE MORE:
AUTOMATIC DAY-NIGHT MIRROR DESCRIPTION AND OPERATION
Inside Rearview Mirror with the Automatic Day-Night Feature System
Operation
The inside rearview mirror uses 2 photocell sensors. One sensor is the
headlight sensor, located on the
face side of the mirror. The headlight sensor is used to determi
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diagnostic Procedure Instructions provides an overview of each
diagnostic category.
DTC Descriptor
DT