DTC Descriptor
DTC B3884 00
- Center High Mounted Stop Lamp (CHMSL) Circuit
Diagnostic Fault Information
Circuit/System Description
North American or European
The stop lamp switch is used to sense the action of the driver application of the brake pedal. The body control module (BCM) provides a low
reference signal and a B+ reference voltage to the stop lamp switch. When the stop lamp switch contacts close indicating the brakes have been
applied, the BCM will apply battery voltage to stop lamp relay control circuit and the center high mounted stop lamp (CHMSL). When the stop lamp
relay receives battery voltage from the BCM, the relay coil is energized and the stop lamp relay switch contacts close applying battery voltage to the
STOP LAMPS fuse to illuminate the left and right stop lamps.
Conditions for Running the DTC
* The ignition is ON.
* The stop lamps must be commanded ON.
Conditions for Setting the DTC
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