DTC B2225: MFD Internal Communication

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 response to the request from control microcomputer to image microcomputer is not received, if the system is not restored within 30 to 60 seconds after sending another request.
Likewise, when response to the request from CPU2 side is not received, if the system is not restored within 30 to 60 seconds after resending the specified request.

Trouble symptom:

MFD does not start.
It malfunctions in each operation.

Wiring diagram:

Multi-function display (MFD) system Ref. to WIRING SYSTEM>Multi-function Display (MFD) 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 B2225 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. 1 - 24 (other than No. 1, 6, 21) - Chassis ground:
Is the resistance 10 kΩ or more?

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

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.