Buick Regal: DTC B3881 or B3882
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 Descriptors
DTC B3881 01
Tail Lamp Circuit Short to Battery
DTC B3881 02
Tail Lamp Circuit Short to Ground
DTC B3881 04
Tail Lamp Circuit Open
DTC B3882 01
Right Tail Lamp Circuit Short to Battery
DTC B3882 02
Right Tail Lamp Circuit Short to Ground
DTC B3882 04
Right Tail Lamp Circuit Open
Diagnostic Fault Information
Circuit/System Description
The headlamp switch is supplied with ground at all times. When the headlamp
switch is placed in either
the park or low beam position, ground is applied to the tail lamp signal circuit
to the body control
module (BCM). The BCM responds by applying battery voltage to the left and to
the right tail lamp
control circuits. This energizes the tail lamps.
Conditions for Running the DTC
B3881 01 or B3882 01
- The ignition is turned OFF.
- The headlamp switch is in OFF or AUTO position.
B3881 02, B3882 02, B3881 04 or B3882 04
The headlamp switch is in park or low beam position.
Conditions for Setting the DTC
B3881 01 or B3882 01
The BCM detects a short to voltage on the control circuit.
B3881 02 or B3882 02
The BCM detects a short to ground on the control circuit.
B3881 04 or B3882 04
The BCM detects an open control circuit.
Action Taken When the DTC Sets
The appropriate tail lamp is inoperative.
Conditions for Clearing the DTC
The condition for setting the DTC is no longer present.
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 Verification
Ignition ON, perform the appropriate Rear Park Lamp test. The appropriate
tail lamp should be
ON/OFF.
Circuit/System Testing
1. Ignition OFF, disconnect the appropriate harness connector at the tail
lamp listed below:
- E42L Tail Lamp Assembly - Left
- E42R Tail Lamp Assembly - Right
2. Test for less than 5 Ω between the appropriate ground circuit harness
connector terminal listed
below and ground:
- E42L Tail Lamp Assembly - Left harness connector terminal C
- E42R Tail Lamp Assembly - Right harness connector terminal D
- If greater than the specified value, test the appropriate ground
circuit for an open/high
resistance.
3. Connect a test lamp between the appropriate control circuit harness
connector terminal listed
below and ground:
- E42L Tail Lamp Assembly - Left harness connector terminal B
- E42L Tail Lamp Assembly - Left harness connector terminal F
- E42R Tail Lamp Assembly - Right harness connector terminal A
- E42R Tail Lamp Assembly - Right harness connector terminal E
4. Command the appropriate Rear Park Lamp test with a scan tool. The test
lamp should turn ON
and OFF when changing between the commanded states.
- If the test lamp is always ON, test the appropriate control circuit for
a short to voltage. If the
circuit tests normal, replace the K9 Body Control Module.
- If the test lamp is always OFF, test the appropriate control circuit for
a short to ground or an
open/high resistance. If the circuit tests normal, replace the K9 Body
Control Module.
5. If all circuits test normal, test or replace the appropriate tail lamp.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic
procedure.
- Tail Lamp Replacement (5-Door Hatchback 68) Tail Lamp Replacement
(5-Door Wagon 35)
- Control Module References for BCM replacement, setup and programming
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:
Locks
Locks are lubricated at the factory.
Use a de-icing agent only when
absolutely necessary, and have the
locks greased after using.
Washing the Vehicle
To preserve the vehicle's finish,
wash it often and out of direct
sunlight.
Caution:
Do not use petroleum-based,
acidic, or abrasive cleaning
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.
Refer to Diagnostic Procedure Instructions for an overview of each
diagnostic category.
DTC Descripto