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. Refer 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.
2. CHECK DTC  .

   Perform the inspection for LAN system. Refer 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 VEHICLE SPEED SIGNAL OF VDC MODULE  .

   Using the Subaru Select Monitor, check the following items in the [Data monitor] of [Brake Control]. Refer to BRAKE CONTROL (DIAGNOSTICS)>DATA MONITOR .

   • FR Wheel Speed
   • FL Wheel Speed
   • RR Wheel Speed
   • RL Wheel Speed

   With the vehicle stopped, is the displayed value abnormal?

   Yes  : Replace the VDC module, or inspect the vehicle speed sensor harness circuit. Refer to VEHICLE DYNAMICS CONTROL (VDC)>VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDC&H/U) .

   No  : Go to  4.

4. CHECK BODY INTEGRATED UNIT VEHICLE SPEED SIGNAL  .

   Using the Subaru Select Monitor, check the following items in the [Data monitor] of [Body Control]. Refer to BODY CONTROL (DIAGNOSTICS)>DATA MONITOR .

   • Front Wheel Speed

   With the vehicle stopped, is the displayed value abnormal?

   Yes  : Replace the body integrated unit. Refer to BODY CONTROL/COMMUNICATION SYSTEM>BODY INTEGRATED UNIT .

   No  : Go to  5.

5. CHECK POWER SEAT Control Module  .
   1. Turn the ignition switch to OFF.
   2. Replace with the power seat Control Module functioning properly. Refer to SEATS>POWER SEAT SYSTEM .
   3. Turn the ignition switch to ON.
   4. Read the DTC of [Power Seat Memory] using the Subaru Select Monitor. Refer to POWER SEAT MEMORY (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC B2602 displayed? (Current malfunction)

   Yes  : Replace the body integrated unit. Refer to BODY CONTROL/COMMUNICATION SYSTEM>BODY INTEGRATED UNIT .

   No  : Malfunction occurred in the power seat Control Module.