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Inspection Procedure 2: The FCM does not activate the automatic braking normally.
 
 
caution
  • The system may not also work correctly under certain external factors (such as weather, road conditions, or ambient environments). Prior to the diagnosis, refer to trouble symptom chart . Grasp the details if necessary.
  • Whenever the ECU is replaced, ensure that the CAN bus lines are normal.
 
 
COMMENTS ON TROUBLE SYMPTOM
Any of the followings are suspected: bad weather (heavy rain, snow, icing), unfavorable road condition, ambient environment, or vehicle condition (heavy load, wheel alignment, tire punctuation), blocked FCM/LDW/AHB-ECU sensor or its surroundings (cracks, contamination, icing, fog on the windshield or the sensor), a faulty FCM/LDW/AHB-ECU.
 
 
TROUBLESHOOTING HINTS
  • Faults on the windshield glass (such as scratch, cracks, contamination or drain drops on the glass surface)
  • FCM/LDW/AHB-ECU improperly installed
  • Malfunction of the FCM/LDW/AHB-ECU
 
 
DIAGNOSIS
STEP 1. Check the FCM/LDW/AHB-ECU mounted surface on the windshield.
Visually check the FCM/LDW/AHB-ECU mounted surface on the windshield for scratch, cracks, contamination or drain drops.
Is the check result normal?
Go to Step 2.
Windshield glass replacement (Refer to GROUP 42A - windshield glass removal and installation ).
 
STEP 2. Retest the system.
(1) Drive the vehicle for approx. ten minutes.
(2)
cautionAfter the road test, do not turn off the ignition switch. If yes, a DTC may be erased.
Check if DTC is set.
Is the DTC set?
Troubleshoot the relevant DTC (Refer to ).
This symptom is caused by a bad weather or environments. It is not a malfunction.