Service Information

Captiva

DTC B3887

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 B3887 02: Trailer Left Indicator Circuit - Short to Ground

DTC B3887 05: Trailer Left Indicator Circuit - Short to Battery or Open

When the left indicator switch is placed in the ON position, ground is applied to the auxiliary body control module (XBCM) through the indicator lamp switch circuit. The XBCM then applies voltage on the trailer indicator lamp circuit to the trailer left indicator lamp.

Conditions for Running the DTC

•	The ignition is ON.

•	The left indicator lamps must be ON and the left indicator lamp must be commanded ON.

Conditions for Setting the DTC

The body control module (BCM) detects an open, short to ground, or short to voltage on the trailer left indicator lamp circuit while trying to apply a voltage to the circuit.

Action Taken When the DTC Sets

The trailer left indicator lamp does not illuminate.

Conditions for Clearing the DTC

•	The conditions for setting the DTC are no longer present.

•	A history DTC clears after 100 malfunction-free ignition cycles.

•	The BCM receives the clear code command from the scan tool.

Reference Information

Schematic Reference

Exterior Lamps Schematics

Connector End View Reference

Component Connector End Views

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, activate with a scan tool the Trailer Left Indicator Lamp switch, trailer left indicator lamp should illuminate.

Circuit/System Testing

Inspect the trailer left indicator lamp bulb for an open or shorted filament.

⇒	If the bulb is inoperable, replace the bulb.

Indicator lamp switch OFF. Clear the DTC. Test the trailer left indicator lamp circuit for a short to voltage, short to ground, an open, or high resistance.

⇒	If all circuits/connections test normal, replace the XBCM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for XBCM replacement, setup, and programming