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DTC B3884

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 B3884 01: Centre High Mounted Brake Lamp Circuit Short to Battery

DTC B3884 02: Centre High Mounted Brake Lamp Circuit Short to Ground

DTC B3884 04: Centre High Mounted Brake Lamp Circuit Open

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Centre High Mounted Brake Lamp Control

B3884 02

B3884 04

B3884 01

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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 will apply battery voltage to the right, left and centre brake lamp control circuits.

Conditions for Running the DTC

B3884 01

Brakes are not applied.

B3884 02 or B3884 04

Brakes are applied.

Conditions for Setting the DTC

B3884 01

The BCM detects a short to voltage on the control circuit.

B3884 02

The BCM detects a short to ground on the control circuit.

B3884 04

The BCM detects an open control circuit.

Action Taken When the DTC Sets

The centre high mounted brake lamp is inoperative.

Conditions for Clearing the DTC

The condition for setting the DTC is not longer present.

Reference Information

Schematic Reference

Exterior Lamps Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Exterior Lamps Schematics

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 Centre Brake Lamp test. The centre brake lamp should be ON/OFF.

Circuit/System Testing
  1. Ignition OFF, disconnect the harness connector at the E6 Centre High Mounted Stop Lamp.
  2. Test for less than 5 Ω between the E6 Centre High Mounted Stop Lamp ground circuit harness connector terminal 1 and ground.
    3. ⇒If greater than the specified value, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the E6 Centre High Mounted Stop Lamp control circuit harness connector terminal 2 and ground.
  4. Command the Centre Brake Lamp test with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    5. ⇒ If the test lamp is always ON, test the 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 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, replace the E6 Centre High Mounted Stop Lamp.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  High Mount Brake lamp Replacement
    •  Control Module References
   


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