C0281

C0281 or C081

CIRCUIT DESCRIPTION
The Stop Lamp Switch is normally closed. With the ignition in the RUN position and the brake pedal not depressed, the EBCM will have ignition voltage present at terminal C of the 10-way connector. When the brakes are applied, the ignition voltage present at the Electronic Brake Control Module (EBCM) will be zero.

CONDITIONS FOR SETTING THE DTC
^ The vehicle is above 15 mph
^ The Stop Lamp Switch never switches during the condition above

ACTION TAKEN WHEN THE DTC SETS
^ Diagnostic Trouble Code (DTC) C0281 is advisory code only
^ The ABS indicator lamp will not be illuminated
^ The ABS will not be disabled

DTC C0281 is an Ignition Latched DTC, which indicates that the above actions remain true until the ignition is turned to OFF (even if the cause of the DTC is intermittent).

CONDITIONS FOR CLEARING THE DTC
^ Repair the conditions responsible for setting the Diagnostic Trouble Code (DTC)
^ Use the Scan Tool Clear DTCs function

DIAGNOSTIC AIDS
Diagnostic Trouble Code (DTC) C0281 can be set by a faulty Stop Lamp Switch, mis-adjusted Stop Lamp Switch or damage in CKT 420 or CKT 441.
Thoroughly check any circuitry that is suspected of causing the intermittent complaint for the following conditions:
^ Backed out terminals
^ Improper mating
^ Broken locks
^ Improperly formed or damaged terminals
^ Poor terminal to wiring connections
^ Physical damage to the wiring harness

TEST DESCRIPTION
The numbers below refer to the steps in the diagnostic table:
2. This step checks the functionality of the Stop Lamp Switch circuit using the Scan Tool.
3. This step checks for a short to voltage in the Stop Lamp Switch circuit between the Stoplamp Switch and the Electronic Brake Control Module (EBCM).
4. This step checks the functionality of the Stop Lamp Switch circuit using the Scan Tool.
5. This step checks for an open in the Stop Lamp Switch circuit between the Stoplamp Switch and the EBCM.