Code No.C1753: ACC/FCM radar blockage detected
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- When the FCM-ECU is replaced, calibrate the radar (refer to
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The radar may not function normally if foreign object or dirt (snow or ice) is adhered on the radar or its surrounding area, or the road condition is bad due to a severe weather (heavy rain or snow). In that case, the system will deactivate the FCM as system protection and display an alert message ("FCM temporarily not available") on the combination meter.
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OPERATION
The FCM-ECU monitors whether the radar or its surrounding area is contaminated or its beam is blocked by foreign material.
DIAGNOSIS CODE SET CONDITION
This diagnosis code is set when any of the following conditions is detected:
- If any of the following conditions are satisfied with the FCM switch "ON", the system will determine that the radar detection performance is deteriorated.
- The radar or its surrounding area is contaminated with dirt or foreign material (snow or ice).
- The system can not monitor a vehicle-travelling-ahead steadily due to a water splash, etc.
- The system receives little radar reflection from a distance (traffic is not heavy and free of obstacles, or the obstacles are covered with snow).
PROBABLE CAUSES
- The radar or its surrounding area is contaminated by dirt or foreign material, etc.
- Improperly installed FCM-ECU
- Malfunction of the FCM-ECU
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STEP 1. Check the radar or its surrounding area for dirt or foreign material.
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(1)Wipe off the dirt or foreign material from the FCM-ECU radar or its surrounding area.
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(2)Erase the diagnosis code.
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(3)Drive the vehicle for approx. five minutes.
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(4)Check if the diagnosis code is set.
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Q.
Is diagnosis code No.C1753 set?
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 Go to Step 2.
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 This diagnosis is complete. The system has deactivated the FCM temporarily for safety reason. This is not a malfunction.
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STEP 2. Check whether the FCM-ECU is installed properly.
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Check whether the FCM-ECU is installed correctly (Refer to ).
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Q.
Is the check result normal?
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Go to Step 3.
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Reinstall the FCM-ECU correctly (Refer to ).
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STEP 3. Check whether the diagnosis code is set again.
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Check again if the diagnosis code is set in the FCM-ECU.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
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(4)On completion, check that the diagnosis code is set again.
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Q.
Is diagnosis code No. C1753 set?
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Replace the FCM-ECU (Refer to ).
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
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