DTC B2230: MFD Led

WARNING: This page is about a different car, the 2021 Subaru Ascent. However, it is still accessible from the selected car via links, so may be relevant.

DTC detecting condition:

When the image microcomputer performs periodical monitoring and after malfunction is detected, malfunction is detected by four consecutive judgments.

Trouble symptom:

Back-up light illumination fault
Faulty illumination operation

Wiring diagram:

Multi-function display (MFD) system Ref. to WIRING SYSTEM>Multi-function Display (MFD) System>WIRING DIAGRAM .
CAN communication system Ref. to WIRING SYSTEM>CAN Communication System>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

CAUTION: Before performing diagnosis, refer to "CAUTION" in "General Description". Ref. to MULTI-FUNCTION DISPLAY (DIAGNOSTICS)>General Description>CAUTION .

CHECK DTC .
1. Using the Subaru Select Monitor, perform the clear memory of [Multi-Function Display]. Ref. to COMMON (diag)>CLEAR MEMORY .
2. Turn the ignition switch to OFF.
3. Disconnect the MFD connector and reconnect it.
4. Turn the ignition switch to ON.
5. Read the DTC of [Multi-Function Display] using the Subaru Select Monitor. Ref. to MULTI-FUNCTION DISPLAY (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .
Is DTC B2230 displayed? (Current malfunction)

Yes : Go to 2.

No : Even if DTC (past malfunction) 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.
CHECK HARNESS (GROUND SHORT CIRCUIT) .
1. Disconnect the MFD connector.
2. Using a tester, measure the resistance between MFD connector and chassis ground.
  Connector & terminal
  
  (i122) No. 19 - Chassis ground:
  
  (i122) No. 20 - Chassis ground:
Is the resistance 10 kΩ or more?

Yes : Go to 3.

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.
CHECK HARNESS (OPEN CIRCUIT) .
1. Disconnect the body integrated unit connector.
2. Using a tester, measure the resistance between the MFD connector and body integrated unit connector.
  Connector & terminal
  
  (i122) No. 19 - (B281) No. 17:
  
  (i122) No. 20 - (B281) No. 19:
Is the resistance less than 10 Ω?

Yes : Replace the MFD. Ref. to INSTRUMENTATION/DRIVER INFO>MULTI-FUNCTION DISPLAY (MFD) .

No : Repair or replace the open circuit of harness.