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DTC C1753 Radar blockage detected
 
 
caution
  • Prior to this DTC, check the area in the proximity of the sensor for cleanness (Refer to ).
  • Whenever the ECU is replaced, ensure that the CAN bus lines are normal.
 
 
OPERATION
The FCM/LDW/AHB-ECU monitors whether the sensor or its surrounding area is contaminated or its beam is blocked by foreign material.
 
 
DIAGNOSTIC FUNCTION AND TROUBLE JUDGMENT
This DTC is set when any of the following conditions is detected:
  • If any of the following conditions is satisfied, the system will determine that the sensor detection performance is deteriorated.
    • Extremely bad weather (heavy rain, snow fall, or icing)
    • Unfavorable road condition or environments
    • The windshield is contaminated or blanked off ahead of the sensor (foreign material, e.g. snow, icing, condensation, or fog on the windshield)
 
 
TROUBLESHOOTING HINTS
  • Faults on the windshield glass (such as scratch, cracks, contamination or drain drops on the glass surface)
  • 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. Using scan tool (M.U.T.-IIISE), read the DTC again.
Check again if the DTC is set in the FCM/LDW/AHB-ECU.
(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) Erase the DTC.
(3) Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(4) Drive the vehicle for approx. five minutes.
(5) Check if DTC is set.
Is the DTC set?
Replace the FCM/LDW/AHB-ECU (Refer to ).
A component protection has been triggered due to a bad weather or unfavorable environments. This is not a malfunction.