[ Model - ECLIPSE CROSS / Year - 2018 ]
2018 / ECLIPSE CROSS / EC - Workshop Manual
54 -CHASSIS ELECTRICAL > 54A-CHASSIS ELECTRICAL > LANE DEPARTURE WARNING SYSTEM (LDW) > SYMPTOM PROCEDURES > The system is not turned on and off by operating the LDW switch.
Inspection Procedure 1: The system is not turned on and off by operating the LDW switch.
 
 
caution
  • Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.
 
 
COMMENTS ON TROUBLE SYMPTOM
If the system is not turned on and off by operating the LDW switch, the ETACS-ECU or the FCM/LDW/AHB-ECU may be defective.
 
 
PROBABLE CAUSES
  • Malfunction of the LDW switch
  • Malfunction of the ETACS-ECU
  • Malfunction of the FCM/LDW/AHB-ECU
  • Damaged harness wires and connectors
 
 
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-IIISE other system data list.
Using the ETACS-ECU data list (Refer to ), check the LDW switch signal.
  • When the LDW switch is pressed.
 
Item No.Item nameNormal condition
109LDW switchON
  • When the LDW switch is not pressed.
 
Item No.Item nameNormal condition
109LDW switchOFF
OK: Normal condition is displayed.
Is the check result normal?
Go to Step 2.
NO : Go to Step 4.
 
STEP 2. M.U.T.-IIISE data list.
Check the FCM/LDW/AHB-ECU data list (Refer to ).
  • When the LDW switch is pressed.
 
Item No.Item nameNormal condition
26LDW switchON
  • When the LDW switch is not pressed.
 
Item No.Item nameNormal condition
26LDW switchOFF
OK: Normal condition is displayed.
Is the check result normal?
Go to Step 3.
Replace the FCM/LDW/AHB-ECU (Refer to ).
 
STEP 3. Retest the system.
Check whether system is turned on and off by operating the LDW switch.
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 FCM/LDW/AHB-ECU (Refer to ).
 
STEP 4. Check of short to earth, and open circuit in LDWS line between ETACS-ECU connector and LDW switch connector.
Is the check result normal?
Go to Step 5.
Repair the connector(s) or wiring harness.
 
STEP 5. Check of open circuit in earth line between LDW switch connector and body earth.
Is the check result normal?
Go to Step 6.
Repair the connector(s) or wiring harness.
 
STEP 6. Check the LDW switch.
Check the LDW switch (Refer to ).
Is the check result normal?
Go to Step 7.
Replace the LDW switch (Refer to ).
 
STEP 7. M.U.T.-IIISE other system data list.
Using the ETACS-ECU data list (Refer to ), check the LDW switch signal.
  • When the LDW switch is pressed.
 
Item No.Item nameNormal condition
109LDW switchON
  • When the LDW switch is not pressed.
 
Item No.Item nameNormal condition
109LDW switchOFF
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 ).
NO : Replace the ETACS-ECU (Refer to ).