DTC B28A0: Vehicle Model Judgment

Detected when the model code for stereo camera and the model code used for CAN data are different.

DTC detecting condition:

Defective CAN system
Defective stereo camera
In the aiming operation, there is an open circuit in the +B harness of the stereo camera.
In the completion of the aiming operation, the switching from IGN OFF to IGN ON takes place too early, and the recording of the model information has not yet been finished.

Trouble symptom:

All functions of EyeSight system do not operate.
EyeSight warning light illuminates.

Wiring diagram:

EyeSight system Ref. to WIRING SYSTEM>EYESIGHT SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

CAUTION: Before performing diagnosis, refer to "CAUTION" in "General Description". Ref. to EYESIGHT (DIAGNOSTICS)>General Description>CAUTION .

CHECK RELATED CONTROL MODULE .
Check the part number of the ECM, TCM, VDC control module and combination meter.

Is each control module a genuine part?

Yes : Go to 2 .

No : Replace the non-genuine control module with a genuine one.
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 .
CHECK LAN SYSTEM .
Perform the diagnosis for LAN system. Ref. to LAN SYSTEM (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .

Is the check result OK?

Yes : Go to 4 .

No : Perform the diagnosis for LAN system.
CHECK WORK SUPPORT DISPLAY .
Using the Subaru Select Monitor, select [Work Support] on the [Select Function] display of [EyeSight].

Is [Confirm on parameter] displayed?

Yes : Go to 5 .

No : Perform the adjustment or inspection of the camera. Ref. to EYESIGHT>CAMERA ADJUSTMENT, INSPECTION . Go to 10 .
CHECK DTC .
1. Using the Subaru Select Monitor, perform the clear memory of [EyeSight]. Ref. to COMMON (DIAG)>CLEAR MEMORY .
2. Turn the ignition switch OFF → ON.
3. Read the DTC of [EyeSight] using the Subaru Select Monitor. Ref. to Eyesight (Diagnostics)>Diagnostic Trouble Code (DTC) .
Does DTC B28A0 stay as a current malfunction?

Yes : Go to 6 .

No : Currently, it is normal. Finish the diagnosis.
CHECK FUSE .
Check fuses No. 11 and No. 22 in the fuse and relay box. Ref. to EYESIGHT>RELAY AND FUSE .

Is the check result OK?

Yes : Go to 7 .

No : Replace the defective fuse. When the replaced fuse blows out easily, check the short circuit in harness.
CHECK HARNESS (POWER SUPPLY CIRCUIT) .
1. Disconnect the stereo camera.
2. Turn the ignition switch to ON.
3. Using a tester, measure the voltage between connector of stereo camera and chassis ground.
  Connector and terminal
  
  (Rf21) No. 6 (+) - Chassis ground (-):
  
  (Rf21) No. 8 (+) - Chassis ground (-):
Is the voltage 10 V or more?

Yes : Go to 8 .

No : Check the power supply system circuit, and if any fault is found, repair the defective parts or replace the harness.
CHECK HARNESS (GROUND CIRCUIT) .
1. Turn the ignition switch to OFF.
2. Disconnect the ground terminal from battery sensor. Ref. to REPAIR CONTENTS>NOTE>BATTERY .
3. Using a tester, measure the resistance between stereo camera and chassis ground.
  Connector and terminal
  
  (Rf21) No. 7 - Chassis ground:
Is the resistance less than 10 Ω?

Yes : Go to 9 .

No : Check the ground system circuit, and if any fault is found, repair the defective parts or replace the harness.
CHECK POOR CONTACT OF CONNECTORS .
Check stereo camera connector.

Is there poor contact of connector?

Yes : Repair the connector.

No : Go to 10 .
CHECK STEREO CAMERA .
1. Connect all connectors and battery terminals securely.
2. Using the Subaru Select Monitor, perform the clear memory of [EyeSight]. Ref. to COMMON (DIAG)>CLEAR MEMORY .
3. Read the DTC of [EyeSight] using the Subaru Select Monitor. Ref. to Eyesight (Diagnostics)>Diagnostic Trouble Code (DTC) .
Is DTC B28A0 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.