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DTC C1000 Brake SW (Stuck)
 
 
caution
  • If there is any problem in the CAN bus lines, an incorrect DTC 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 ASC-ECU via the CAN bus lines.
 
 
 
DTC SET CONDITIONS
This DTC is set in the following case.
  • When the vehicle has run for a long time with the stoplight switch turned ON.
  • When the OFF status of the stoplight switch does not match the vehicle attitude
 
 
 
PROBABLE CAUSES
  • Incorrect adjustment of brake pedal height
  • Master cylinder malfunction
  • Brake booster malfunction
  • Damaged wiring harness and connectors
  • Improper adjustment of stoplight switch installation position
  • Malfunction of the stoplight switch
  • ETACS-ECU malfunction
  • ASC-ECU malfunction
 
 
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), diagnose the CAN bus line.
(1)
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-IIISE).
Connect scan tool (M.U.T.-IIISE). Refer to "How to connect the Scan Tool (M.U.T.-IIISE) ."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
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. DTC recheck after resetting CAN bus lines.
Is DTC C1000 set?
Go to Step 3.
This diagnosis is complete.
 
STEP 3. Brake pedal check.
Refer to GROUP 35A - On-vehicle Service, Brake Pedal Check and Adjustment .
Is the check result normal?
Go to Step 4.
repair it.
 
STEP 4. Check for stoplight switch installation.
Refer to GROUP 35A - On-vehicle Service, Brake Pedal Check and Adjustment .
Is the check result normal?
Go to Step 5.
Install the stoplight switch correctly (Refer to GROUP 35A - Brake Pedal ).
 
STEP 5. Stoplight switch continuity check.
Refer to GROUP 35A - Brake Pedal/Inspection .
Is the check result normal?
Go to Step 6.
Replace the stoplight switch (Refer to GROUP 35A - Brake Pedal ).
 
STEP 6. Brake drag check.
Check the brake system for drag (Refer to GROUP 35A - Front Disc Brake or Rear Disc Brake <Vehicles without electric parking brake>, <Vehicles with electric parking brake>).
Is the check result normal?
Go to Step 7.
Repair it.
 
STEP 7. Brake booster check.
Refer to GROUP 35A - On-vehicle Service/Brake Booster Operation Check .
Is the check result normal?
Go to Step 8.
Replace the brake booster (Refer to GROUP 35A - Master Cylinder Assembly and Brake Booster ).
 
STEP 8. Using scan tool (M.U.T.-IIISE), check other system's data list
Check the ETACS-ECU system data list.
  • The brake pedal is depressed.
 
Item No.Item nameNormal condition
113Stoplight switchOFF to ON
Item No.Item nameNormal condition
113Stoplight switchOFF to ON
Is the check result normal?
Go to Step 9.
Refer to GROUP 54A - ETACS, Inspection Procedure 12 "The stoplight switch signal is not received." .
 
STEP 9. Check whether the DTC is set again.
Erase the DTC.
Is DTC C1000 set?
Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ).
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/How to Cope with Intermittent Malfunctions .)