[ Model - ECLIPSE CROSS / Year - 2018 ]
2018 / ECLIPSE CROSS / EC - Workshop Manual
35 -SERVICE BRAKES > 35C-ACTIVE STABILITY CONTROL SYSTEM (ASC) > TROUBLESHOOTING<ASC-ECU><ASC-ECU> > SYMPTOM PROCEDURES > BRAKE WARNING LAMP DOES NOT ILLUMINATE WHEN THE IGNITION SWITCH IS TURNED TO ON POSITION (ENGINE STOPPED).
Inspection Procedure 5: Brake warning lamp does not illuminate when the ignition switch is turned to ON position (engine stopped).
 
 
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
  • ASC-ECU sends the illumination request signal of the break warning lamp to the combination meter through ETACS-ECU via the CAN communication.
  • ASC-ECU illuminates brake warning lamp via ETACS-ECU for approximately 3 seconds for bulb check with the ignition switch turned to the ON position.
 
 
 
COMMENTS ON TROUBLE SYMPTOM
This may be caused by faults in the CAN bus line, ETACS-ECU, combination meter or ASC-ECU.
 
 
 
PROBABLE CAUSES
  • Damaged wiring harness and connectors
  • Malfunction of ETACS-ECU
  • Malfunction of the combination meter
  • ASC-ECU malfunction
 
 
 
 
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-IIISE CAN bus diagnostics
Use M.U.T.-IIISE to diagnose the CAN bus lines.
Is the check result normal?
Go to Step 2.
Repair the CAN bus lines. (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
 
STEP 2. M.U.T.-IIISE diagnosis code
Use M.U.T.-IIISE to check the diagnosis code for the ASC system.
Is the diagnosis code set?
Carry out the diagnosis for the diagnosis code (Refer to ).
Go to Step 3.
 
STEP 3. M.U.T.-IIISE Special Function for other system
Perform the following special function by the combination meter system, and check if the ABS warning lamp illuminates (Refer to GROUP 54A - Combination Meter ).
  • Item 6: Indicator (AUTO)
Is the check result normal?
Go to Step 4.
Replace the combination meter.
 
STEP 4. M.U.T.-IIISE other system diagnosis code
Using M.U.T.-IIISE, check that diagnosis code No.U0141 is not set in the combination meter system.
Is the diagnosis code set?
Diagnose the combination meter (Refer to GROUP 54A - Combination Meter/Diagnosis Code ).
Go to Step 5.
 
STEP 5. M.U.T.-IIISE other system diagnosis code
Using M.U.T.-IIISE, check that diagnosis code No.U0121 is not set in the ETACS system.
Is the diagnosis code set?
Perform troubleshooting on ETACS-ECU (Refer to GROUP 54A - ETACS/Diagnosis Code ).
Go to Step 6.
 
STEP 6. Retest the system.
Does the brake warning lamp turn ON and OFF
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ).
Replace the hydraulic unit (ASC-ECU) (Refer to ).