DTC B2225: MFD Internal Communication

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.

1. CHECK DTC  .
   1. Turn the ignition switch to ON.
   2. Using the Subaru Select Monitor, perform the clear memory of [Multi-Function Display]. Ref. to COMMON (DIAG)>CLEAR MEMORY .
   3. Turn the ignition switch to OFF.
   4. Disconnect the MFD connector and reconnect it.
   5. Turn the ignition switch to ON.
   6. Read the DTC of [Multi-Function Display] using the Subaru Select Monitor. Ref. to MULTIFUNCTION 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.
2. CHECK HARNESS (GROUND SHORT CIRCUIT)  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the MFD connector.
   3. Using a tester, measure the resistance between MFD connector and chassis ground.

      Connector and terminal 

      (i122) No. 1 - 24 (other than No. 21, 24) - 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.