[ Model - ECLIPSE CROSS / Year - 2018 ]
2018 / ECLIPSE CROSS / EC - Workshop Manual
54 -CHASSIS ELECTRICAL > 54A-CHASSIS ELECTRICAL > ULTRASONIC MISACCELERATION MITIGATION SYSTEM/CORNER SENSOR SYSTEM > SYMPTOM PROCEDURES > The system cannot be switched on or off when the FCM/UMS ON/OFF switch is operated
Inspection Procedure 2: The system cannot be switched on and off when the forward collision mitigation system (FCM) and ultrasonic misacceleration mitigation system ON/OFF switch is operated.
 
 
 
 
COMMENTS ON TROUBLE SYMPTOM
When the system cannot be switched on and off when the forward collision mitigation system (FCM) and ultrasonic misacceleration mitigation system ON/OFF switch is operated, the forward collision mitigation system (FCM) and ultrasonic misacceleration mitigation system ON/OFF switch, the CAN bus lines, the ASC-ECU, or the clearance warning control unit may have a problem.
 
 
PROBABLE CAUSES
  • Malfunction of CAN bas line
  • Malfunction of forward collision mitigation system (FCM) and ultrasonic misacceleration mitigation system ON/OFF switch
  • Malfunction of ASC-ECU
  • Malfunction of clearance warning control unit
  • Damaged harness wires and connectors
 
 
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-IIISE CAN bus diagnostics.
Use the M.U.T.-IIISE to diagnose the CAN bus lines.
Is the check result normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ).
 
STEP 2. M.U.T.-IIISE data list.
Check the ASC-ECU service data (Refer to GROUP 35C - Data List Reference Table ).
  • Operate the forward collision mitigation system (FCM) and ultrasonic misacceleration mitigation system ON/OFF switch.
 
Item No.Item nameNormal condition
66FCM ON/OFF switchWhen the switch is operated: ON
When the switch is not operated: OFF
OK: Normal condition is displayed.
Is the check result normal?
Go to Step 3.
Troubleshoot the ASC-ECU (Refer to GROUP 35C - Troubleshooting ).
 
STEP 3. M.U.T.-IIISE data list.
Check the clearance warning control unit service data (Refer to ).
  • Operate the forward collision mitigation system (FCM) and ultrasonic misacceleration mitigation system ON/OFF switch.
 
Item No.Item nameNormal condition
18FCM OFF SW input signal (CAN)When the switch is operated: ON
When the switch is not operated: OFF
OK: Normal condition is displayed.
Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace the clearance warning control unit (Refer to ).