2018 / ECLIPSE CROSS / EC - Workshop Manual
17 -ENGINE AND EMISSION CONTROL > ADAPTIVE CRUISE CONTROL SYSTEM (ACC) > DIAGNOSIS CODE PROCEDURES > CODE NO. C2256: BRAKE SWITCH SIGNAL FAIL
Code No. C2256: Stop Lamp Switch Signal Failure
| 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.
- Whenever the ECU is replaced, ensure that the CAN bus lines are normal.
- When the ETACS-ECU of vehicles without KOS is replaced, the encrypted code of the ignition key needs to be registered to the ETACS-ECU. (If the encrypted code is not registered, the engine cannot be started. Register the encrypted code as described in GROUP 54A, Immobilizer System - How to Register Key ID
 .) - When the ACC/FCM-ECU is replaced, calibrate the radar (refer to ).
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OPERATION
ACC/FCM-ECU communicates with the ETACS-ECU via the CAN bus lines.
DIAGNOSIS CODE SET CONDITION
Check Conditions
- More than 2 seconds have passed since the ignition switch was turned to "ON" position.
- ACC/FCM-ECU power voltage is more than 9 V and is less than 18 V.
Judgement Criterion
- Abnormality is detected in the stop lamp switch signal received from the ETACS-ECU.
PROBABLE CAUSES
- Malfunction of the CAN bus line
- Malfunction of the ETACS-ECU
- Malfunction of the ACC/FCM-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-IIISE CAN bus diagnostics.
STEP 2. Check whether the diagnosis code is set again.
STEP 3. Check whether the diagnosis code is set again.
Go to Step 2.
Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting, Can Bus Diagnostics Table