DTC B2603: EPB Control

DTC detecting condition: 

When EPB operation error data was continuously received from EPB for 4000 ms or more.

Trouble symptom: 

Seat operation is possible with manual operation, but not with memory function.

(Memory registration is possible.)

1. CHECK DTC  .
   1. Turn the ignition switch to ON.
   2. Read the DTC of [Power Seat Memory] using the Subaru Select Monitor. Ref. to Power Seat Memory System (Diagnostics)>Diagnostic Trouble Code (DTC) .

      Is DTC B2603 displayed? (Current malfunction)

      Yes  : Go to  2 .

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

   Perform the inspection for LAN system. Ref. to LAN SYSTEM (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .

   Is the check result OK?

   Yes  : Go to  3 .

   No  : Perform the inspection according to the diagnosis for LAN system.

3. CHECK VDC MODULE  .
   1. Perform the diagnosis for VDC module. Ref. to BRAKE CONTROL (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .
   2. Read the DTC of [Power Seat Memory] using the Subaru Select Monitor. Ref. to Power Seat Memory System (Diagnostics)>Diagnostic Trouble Code (DTC) .

      Is DTC B2603 displayed? (Current malfunction)

      Yes  : Replace the VDC module. Ref. to VEHICLE DYNAMICS CONTROL (VDC)>VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM & H/U) .

      No  : Malfunction occurred in the VDC module.

4. CHECK POWER SEAT CONTROL MODULE 

   Check that the memory restoration and registration functions operate properly with the ignition switch ON.

   Do the functions operate properly?

   Yes:  Malfunction occurred in the VDC module.

   No:  Check the power seat system for the following trouble symptoms.

   • Restoration-related
     • The seat position cannot be registered with the seat position memory switch. Ref. to SEATS>POWER SEAT SYSTEM>INSPECTION > CHECK SEAT POSITION MEMORY SWITCH (TYPE WITH SEAT POSITION MEMORY)
     • The seat position cannot be registered with the smart keyless. Ref. to SEATS>POWER SEAT SYSTEM>INSPECTION > IT DOES NOT FUNCTION WITH MANUAL OPERATION (DRIVER'S SEAT, TYPE WITH SEAT POSITION MEMORY)
     • The seat position cannot be registered with the driver monitoring system. Ref. to SEATS>POWER SEAT SYSTEM>INSPECTION > SOME MOTORS DO NOT OPERATE (DRIVER'S SEAT, TYPE WITH SEAT POSITION MEMORY)
   • Registration-related
     • The seat position cannot be restored with the seat position memory switch. Ref. to THE SEAT POSITION CANNOT BE REGISTERED WITH THE SEAT POSITION MEMORY SWITCH, (DRIVER'S SEAT, TYPE WITH SEAT POSITION MEMORY)
     • The seat position is unable to be operated while interlocked with the smart keyless. Ref. to THE SEAT POSITION CANNOT BE RESTORED WITH THE SEAT POSITION MEMORY SWITCH, (DRIVER'S SEAT, TYPE WITH SEAT POSITION MEMORY)
     • The seat position is unable to be interlocked with the driver monitoring system. Ref. to THE SEAT POSITION IS UNABLE TO BE OPERATED WHILE LINKED WITH THE SMART KEYLESS. (DRIVER'S SEAT, TYPE WITH SEAT POSITION MEMORY)