C0281

Circuit Description
The stoplamp switch is closed when the brake is released. Ignition voltage is supplied through the closed stoplamp switch to the EBCM. When the brake is applied, the switch is open and the signal to the EBCM is low.

Conditions for Running the DTC
^ The ignition is ON.
^ The vehicle experiences an ABS event involving all 3 brake circuits.
OR:
^ The ignition is ON.
^ The vehicle is moving at a speed of less than 56 km/h (35 mph) when the IPC completes the ABS bulb check.
^ The vehicle reaches a speed of greater than 56 km/h (35 mph) after the above criteria are met.

Conditions for Setting the DTC
Either of the following conditions will set DTC C0281:
^ The EBCM detects that the brake is released during an ABS event involving all 3 brake circuits.
^ The E13CM detects that the brake is applied for the entire time that the ignition is ON.

Conditions for Clearing the DTC
^ Repair the condition(s) responsible for setting the DTC.
^ Use a scan tool in order to clear the DTC.

Diagnostic Aids
Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to Testing for Intermittent and Poor Connections, Connector Repairs and Wiring Repairs under Diagrams, Diagnostic Aids.

Test Description
The numbers below refer to the step numbers on the diagnostic table:
4. This step tests for a shorted stoplamp switch.
5. This step tests for an open stoplamp switch.
12. If the system is functioning properly, the scan tool displays On when the brake is applied and Off when the brake is released.