DTC B28A1: Eyesight Communication (ECM)

Detected when the engine control module (ECM) detects the malfunction of stereo camera, or when the stereo camera or ECM is assembled incorrectly.

DTC detecting condition: 

• Defective CAN system
• Defective engine control module (ECM)
• Defective stereo camera
• Incorrect assembly of stereo camera (when the stereo camera designed for EyeSight (Ver. 2) type vehicle is installed to the EyeSight (Ver. 3) type vehicle, etc.)
• Incorrect assembly of ECM (when the ECM designed for another model is installed, etc.)

Trouble symptom: 

• All functions of EyeSight system do not operate.
• EyeSight warning light illuminates.
  CAUTION: Before performing diagnosis, refer to "CAUTION" in "General Description". Ref. to EYESIGHT (DIAGNOSTICS) (EXCEPT FOR HEV)>GENERAL DESCRIPTION>CAUTION .

1. CHECK ECM  .

   Check the part number of the ECM.

   Is the ECM genuine?

   Yes  : Go to  2.

   No  : Replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO) (EXCEPT FOR HEV)>ENGINE CONTROL MODULE (ECM)>REMOVAL .

2. CHECK STEREO CAMERA  .
   1. Remove the camera cover.
   2. Check the part number of the stereo camera.

   Is the stereo camera genuine?

   Yes  : Go to  3.

   No  : Replace the stereo camera. Ref. to EYESIGHT>STEREO CAMERA>REMOVAL .

3. CHECK LAN SYSTEM  .

   Perform the diagnosis for LAN system. Ref. to LAN SYSTEM (DIAGNOSTICS) (EXCEPT FOR HEV)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .

   Is the check result OK?

   Yes  : Go to  4.

   No  : Perform the diagnosis for LAN system.

4. CHECK ECM  .

   Perform the diagnosis for the engine. Ref. to ENGINE (DIAGNOSTICS) (H4DO) (EXCEPT FOR HEV)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .

   Is the check result OK?

   Yes  : Go to  5.

   No  : Perform the diagnosis for the engine.

5. CHECK CONNECTOR  .

   Check the ECM connector and the stereo camera connector.

   Is the check result OK?

   Yes  : Go to  6.

   No  : Repair or replace the connector.

6. CHECK STEREO CAMERA  .
   1. Turn the ignition switch to ON.
   2. Read the DTC of [EyeSight] using the Subaru Select Monitor. Ref. to EYESIGHT (DIAGNOSTICS) (EXCEPT FOR HEV)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC other than DTC B28A1 displayed?

   Yes  : Perform the diagnosis for DTC other than DTC B28A1.

   No  : Go to  7.

7. CHECK STEREO CAMERA  .
   1. Using the Subaru Select Monitor, perform the clear memory of [EyeSight]. Ref. to COMMON (DIAG)>CLEAR MEMORY .
   2. Read the DTC of [EyeSight] using the Subaru Select Monitor. Ref. to EYESIGHT (DIAGNOSTICS) (EXCEPT FOR HEV)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC B28A1 displayed?

   Yes  : Replace the stereo camera. Ref. to EYESIGHT>STEREO CAMERA>REMOVAL

   No  : Even if DTC is displayed, the circuit has returned to a normal condition at this time.

   Reproduce the failure, and then perform the diagnosis again.

   NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.