B3882
DTC B3881 or B3882
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC B3881 02
-
Tail Lamp Circuit Short to Ground
DTC B3881 04
-
Tail Lamp Circuit Open
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 body control module (BCM) energizes the tail lamps by applying voltage to the tail lamp control circuit. When the tail lamp control circuit is energized, the tail lamps are illuminated.
Conditions for Running the DTC
Headlamp switch in park or low beam position.
Conditions for Setting the DTC
B3881 02
The BCM detects a short to ground on the left park lamp supply voltage circuit.
B3881 04
The BCM detects an open/high resistance on the left park lamp supply voltage circuit
B3882 02
The BCM detects a short to ground on the right park lamp supply voltage circuit.
B3882 04
The BCM detects an open/high resistance on the right park lamp supply voltage circuit
Action Taken When the DTC Sets
The appropriate tail lamp will be inoperative.
Conditions for Clearing the DTC
* The DTC will be current for as long as the fault is present.
* When the fault is no longer present, the DTC will be a history DTC.
* A history DTC will clear after 50 ignition cycles.
Reference Information
Schematic Reference
Exterior Lights Schematics Exterior Lights Schematics
Connector End View Reference
Component Connector End Views Connector End Views By Name
Description and Operation
Exterior Lighting Systems Description and Operation Exterior Lighting Systems
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Programming and Relearning for scan tool information
Circuit/System Verification
Ignition ON, command the Left Park Lamps ON and OFF with a scan tool. The park lamps should turn ON and OFF while changing between the commanded states.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the appropriate E42 tail lamp assembly.
2. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 10 ohms between the ground circuit terminal F and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Connect a test lamp between the control circuit terminal A and the ground circuit terminal F.
4. Command the Park Lamps ON and OFF 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 control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
• If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
5. If all circuits test normal, test or replace the E42 tail lamp assembly.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Tail Lamp Bulb Replacement Service and Repair
* Control Module References Programming and Relearning for BCM replacement, programming and setup