Code No. C2256: Brake Switch Signal Fail
Code No. C2276: Brake Switch Signal


caution
  • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C - Troubleshooting ).
  • Whenever the ECU is replaced, ensure that the CAN bus lines are normal.
  • When the ACC/FCM-ECU is replaced, calibrate the radar (refer to ).

OPERATION


The ACC/FCM-ECU receives stop lamp switch signal from the ETACS-ECU.

DIAGNOSIS CODE SET CONDITION


The ACC/FCM-ECU sets the diagnosis code when it receives an abnormal stop lamp switch signal from the ETACS-ECU.
note Diagnosis code No. C2276 is not set as a historic fault.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.

Q. Is the check result normal?
Go to Step 2.
Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting ). On completion, go to Step 2.

STEP 2. M.U.T.-III data list for other system
Check the ETACS-ECU system data list (Refer to GROUP 54A - ETACS, Troubleshooting, Service Data Reference Table).

  • Item No. 108: Stop lamp switch

Q. Is the check result normal?
Go to Step 3.
Troubleshoot the ETACS-ECU (Refer to GROUP 54A - ETACS, Troubleshooting, Input Signal Procedures, Inspection Procedure 10). Then go to Step 3.

STEP 3. Check whether the diagnosis code is set again.
Check again if the diagnosis code is set in the ACC/FCM-ECU.
(1)Erase the diagnosis code.
(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3)Start the engine.
(4)Press the FCM and UMS ON/OFF switch to turn the FCM system to ON.
(5)Depress the brake pedal several times.
(6)On completion, check that the diagnosis code is set again.

Q. Is diagnosis code No. C2256 or C2276 set?
Replace the ACC/FCM-ECU (Refer to ).
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunctions).