Code No. C1000 Brake SW (stuck)


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 - CAN Bus Diagnostics Table ).
  • Whenever ECU is replaced, ensure that the CAN bus lines are normal.

OPERATION
ETACS-ECU sends the ON signal generated when the brake pedal is depressed and OFF signal generated when it is released to ABS-ECU via the CAN bus lines.

DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set in the following case.

  • When the vehicle has run for a long time with the stop lamp switch turned ON.
  • When the OFF status of the stop lamp switch does not match the vehicle attitude

PROBABLE CAUSES

  • Damaged wiring harness and connectors
  • Improper adjustment of stop lamp switch installation position
  • Malfunction of the stop lamp switch
  • Malfunction of ETACS-ECU
  • ABS-ECU malfunction

DIAGNOSTIC PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?
Go to Step 3.
Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ). On completion, go to Step 2.

STEP 2. Diagnosis code recheck after resetting CAN bus lines

Q. Is diagnosis code No.C1000 set?
Go to Step 3.
This diagnosis is complete.

STEP 3. M.U.T.-III other system’s data list
Check the ETACS-ECU system data list.

  • The brake pedal is depressed.
Item No.
 Item name
 Normal condition
290
 Stop lamp switch
 OFF to ON

Q. Is the check result normal?
Go to Step 4.
Refer to GROUP 54A - ETACS, Inspection Procedure 12 "The stop lamp switch signal is not received."

STEP 4. Diagnosis code recheck
Erase the diagnosis code.

Q. Is diagnosis code No.C1000 set?
Replace the hydraulic unit (integrated with ABS-ECU) (Refer to ). Then go to Step 5.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ).

STEP 5. Diagnosis code recheck
Erase the diagnosis code.

Q. Is diagnosis code No.C1000 set?
Return to Step 1.
This diagnosis is complete.