C0281

DTC C0281 Brake Switch Circuit:

DTC C0281 Brake Switch Circuit 1 Of 2:

DTC C0281 Brake Switch Circuit 2 Of 2:

CIRCUIT DESCRIPTION
The Stop Lamp Switch is normally closed. With the ignition in the RUN position and the brake pedal not depressed, the Electronic Brake Control Module (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 EBCM will be zero.

CONDITIONS FOR SETTING THE DTC
- After power-up, the microprocessor never sees the brake switch released and the vehicle reaches a speed above 24 km/h (15 mph), or
- The vehicle is in an ABS stop for more than 2 seconds and the brake switch is not depressed

ACTION TAKEN WHEN THE DTC SETS
- The ABS indicator lamp will not be illuminated
- The ABS will not be disabled

DTC C0281 is advisory code only. The DTC is stored in memory, but the ABS indicator lamp will not light, and ABS will not be disabled.

CONDITIONS FOR CLEARING THE DTC
Repair the conditions responsible for setting the DTC

Use the Scan Tool Clear DTCs function

DIAGNOSTIC AIDS
DTC C0281 can be set by a faulty Stop Lamp Switch, misadjusted Stop Lamp Switch or damage in Circuit (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 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.