B3881

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 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

When the headlamp switch is placed in either the HEAD or PARK position, ground is applied to the park lamp 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, side marker, and license lamps.

Conditions for Running the DTC

* Battery voltage must be between 9-16 V.
* Park lamps ON.

Conditions for Setting the DTC

B3881 01

The BCM detects a short to voltage in the left rear tail lamp control circuit.

B3881 02

The BCM detects a short to ground in the left rear tail lamp control circuit.

B3881 04

The BCM detects an open in the left rear tail lamp control circuit.

B3882 01

The BCM detects a short to voltage in the right rear tail lamp control circuit.

B3882 02

The BCM detects a short to ground in the right rear tail lamp control circuit.

B3882 04

The BCM detects an open in the right rear tail lamp control circuit.

Actions Taken When the DTC Sets

The appropriate tail lamp will not operate.

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 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 Testing

1. Ignition OFF, disconnect the harness connector at the appropriate tail lamp.
2. Ignition OFF, exterior lamps OFF, test for less than 5 ohm between the ground circuit terminal listed below and ground:

* E5 Tail/Stop and Turn Signal Lamp - terminal 1
* E2 Side Marker Lamp-Rear - terminal 2

• 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 listed below and ground:

* E5 Tail/Stop and Turn Signal Lamp - terminal 2
* E2 Side Marker Lamp-Rear - terminal 1

4. Ignition ON, command the Rear Park Lamp Test 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 tail lamp.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Tail Lamp Replacement - Inboard (Tail Lamp Replacement - Inboard)
* Tail Lamp Replacement - Outboard (Tail Lamp Replacement - Outboard)
* Rear Side Marker Lamp Replacement (Rear Side Marker Lamp Replacement)
* Control Module References (Programming and Relearning) for BCM replacement, setup, and programming