DTC B2602: Vehicle Speed Control

DTC detecting condition: 

When vehicle speed error data was continuously received from VDC for 800 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 (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC B2602 displayed? (Current code)

   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 LAN SYSTEM  .

   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. After the diagnosis, read the DTC of [Power Seat Memory] using the Subaru Select Monitor. Ref. to POWER SEAT MEMORY (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC B2602 displayed? (Current code)

   Yes Replace the seat position memory control module. Ref. to SEATS>POWER SEAT SYSTEM .

   No Go to  4.

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