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 registration/restoration is not possible with seat memory switch and DMS.

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 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 (VDCcONTROL MODULE & 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 & Remote Control Mirror Control Module  .
   1. Turn the ignition switch to OFF.
   2. Replace with a normal Power Seat & Remote Control Mirror control module. 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 code)

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

   No  : There was something wrong with Power Seat & Remote Control Mirror control module.