DTC B2602: Vehicle Speed Control

DTC detecting condition: 

Detection of 300 km/h or more continued for a certain period of time (2100 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 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 VEHICLE SPEED SIGNAL OF VDC MODULE. 

   Using the Subaru Select Monitor, check the following items in the [Data monitor] of [Brake Control]. Ref. 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. Ref. to VEHICLE DYNAMICS CONTROL (VDC)>VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM & 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]. Ref. to BODY CONTROL (DIAGNOSTICS)>DATA MONITOR .

   • Front Wheel Speed

   With the vehicle stopped, is the displayed value abnormal?

   YES 

   Replace the body integrated unit. Ref. to SECURITY AND LOCKS>BODY INTEGRATED UNIT .

   NO  : Go to  5.

5. CHECK POWER SEAT CONTROL MODULE. 
   1. Turn the ignition switch to OFF.
   2. Replace with a power seat control module functioning properly. Ref. 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. Ref. to POWER SEAT MEMORY (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

      Is DTC B2602 displayed? (Current malfunction)

      YES 

      Replace the body integrated unit. Ref. to SECURITY AND LOCKS>BODY INTEGRATED UNIT .

      NO  : There was an abnormality in power seat control module.