DTC B3884
Diagnostic Instructions
DTC Descriptor
| DTC B3884 02: Center High Mounted Brake Lamp
Circuit Short to Ground |
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
Center High Mounted Brake Lamp Control
|
B3884 02
|
1
|
2
|
-
|
1. Center High Mounted Brake Lamp Always OFF
2. Center High Mounted Brake Lamp Always ON
|
|
| |
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 analog voltage signal to the body control module
(BCM). The BCM will apply battery voltage to the right, left and
center stop lamp control circuits and to the trailer lighting
converter if installed in the vehicle.
Conditions for Running the DTC
Brakes are applied.
Conditions for Setting the DTC
The BCM detects a short to ground on the control circuit.
Action Taken When the DTC Sets
Brake lamp does not illuminate.
Conditions for Clearing the DTC
The condition for setting the DTC is no longer present.
Reference Information
Schematic Reference
Exterior Lights Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Exterior Lights Schematics
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Ignition ON, perform the Center Brake Lamp test. The center
brake lamp should be ON/OFF.
Circuit/System Testing
| 1. |
Ignition OFF, disconnect the
harness connector at the E6 Center High Mounted Stop Lamp.
|
| 2. |
Test for less than 5 Ω
between the ground circuit terminal 1 and ground. |
| ⇒ |
If greater than the specified value, test the
ground circuit for an open/high resistance. |
| 3. |
Connect a test lamp between
the control circuit terminal 2 and ground. |
| 4. |
Command the Center Brake Lamp
Command test 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 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 Center High Mounted Stop Lamp. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
