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DTC U1232: Lost Communication With Rear/Side Radar Control Module

DTC DETECTING CONDITION: 

No data is received from radar sensor.

TROUBLE SYMPTOM: 

Radar sensor does not operate normally.

Step Check Yes No
1 CHECK PERFORMING OF BASIC DIAGNOSTIC PROCEDURE  . Was the basic diagnostic procedure performed up to STEP 8? Go to step 2  . Perform the basic diagnostic procedure. Ref. to BASIC DIAGNOSTIC PROCEDURE .
2 CHECK DTC  .
Check the displayed DTC.		 Are DTCs other than U*** displayed? Perform the diagnosis according to DTC. Go to step 3  .
3 CHECK DTC  .
Check the displayed DTC.		 Is U1232 a current malfunction? Go to step 4  . Go to step 8  .
4 CHECK DTC  .
  1. Check CAN communication circuit. Ref. to CAN COMMUNICATION CIRCUIT CHECK .
  2. Read the DTC using Subaru Select Monitor.

    Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) .

 Is U1232 a current malfunction? Go to step 5  . Go to step 8  .
5 CHECK DTC  .
Using the Subaru Select Monitor, read DTC of all the systems. Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) .		 Is the radar data no-receive detected in several modules? Replace the radar sensor LH. Ref. to Radar Sensor . Go to step 6  .
6 REPLACE MODULE  .
  1. Replace the radar sensor LH.
  2. Read the DTC using Subaru Select Monitor.

    Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) .

 Is U1232 a current malfunction? Go to step 7  . System is normal.
7 CHECK MODULE  .
  1. Reinstall the radar sensor LH.
  2. Replace the module that the DTC has been detected.
  3. Read the DTC using Subaru Select Monitor.

    Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) .

 Is U1232 a current malfunction? Replace the radar sensor LH. Ref. to Radar Sensor . System is normal.
8 CHECK HARNESS  .
  1. Shake the harness, and check for poor contact.
  2. Read the DTC using Subaru Select Monitor.

    Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) .

 Is U1232 a current malfunction? Repair the poor contact of harness, or replace the harness. Go to step 9  .
9 CHECK CONNECTOR  .
Check the connector used for high speed CAN for poor contact.		 Is there poor contact of connector? Repair the connector that has poor contact, or replace harness. It is possible that temporary poor communication occurs. Delete the DTC. Ref. to CLEAR MEMORY MODE .
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