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DTC B3889

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 B3889 02: Trailer Brake Lamps Circuit Short to Ground

DTC B3889 04: Trailer Brake Lamps Circuit Open

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Trailer Brake Lamps Control

3889 02

3889 04

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Circuit/System Description

The brake pedal position sensor is used to sense the action of the driver application of the brake pedal. The brake pedal position sensor provides an analogue voltage signal to the body control module (BCM). The BCM sends this message to the trailer lighting converter. The trailer lighting converter then applies a voltage to the trailer brake lamp through there supply circuit.

Conditions for Running the DTC

B3889 02 or B3889 04

The appropriate trailer brake lamp signal is active.

Conditions for Setting the DTC

B3889 02

The trailer lighting converter detects a short to ground on the control circuit.

B3889 04

The trailer lighting converter detects an open control circuit.

Conditions for Clearing the DTC

The condition for setting the DTC is not longer present.

Action Taken When the DTC Sets

The appropriate trailer brake lamp is inoperative.

Reference Information

Schematic Reference

Exterior Lamps Schematics

Connector End View Reference

Component Connector End Views

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 Trailer Brake Lamps test. The trailer brake lamps should be ON/OFF.

Circuit/System Testing
  1. Ignition OFF, test for less than 5 Ω between the X88 Trailer Connector terminal 3, 11, 13 and ground.
    2. ⇒If greater than the specified value, test the appropriate ground circuit for an open/high resistance.
  2. Connect a test lamp between the X88 Trailer Connector terminal 6 and ground.
  3. Command the Trailer Brake Lamps Active/Inactive test with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    4. ⇒If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K68 Trailer Lighting Control Module.
    ⇒If the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the K68 Trailer Lighting Control Module.
  4. If all the circuits test normal, test the brake lamp circuit at the trailer.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for trailer lighting converter replacement, setup and programming

   


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