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.)

CAUTION: Before performing diagnosis, refer to "CAUTION" in "General Description". Ref. to POWER SEAT MEMORY (DIAGNOSTICS)>GENERAL DESCRIPTION>CAUTION .

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 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.
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.
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 malfunction)

Yes: Replace the seat position memory Control Module. Ref. to SEATS>POWER SEAT SYSTEM .

No: Go to 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 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 is unable to be operated while interlocked with the smart keyless. 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 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 SMART KEYLESS. (DRIVER'S SEAT, TYPE WITH SEAT POSITION MEMORY) .