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 the power seat control module using the Subaru Select Monitor. Ref. to POWER SEAT MEMORY SYSTEM (DIAGNOSTICS)>Read 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. 

   Stop the vehicle, and read the current data values «FR Wheel Speed»«FL Wheel Speed»«RR Wheel Speed»«RL Wheel Speed» of VDC module using Subaru Select Monitor. Ref. to VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)>SUBARU SELECT MONITOR>OPERATION>READ CURRENT DATA .

   Is the displayed value abnormal?

   Yes  Replace the VDC module, or inspect the vehicle speed sensor harness circuit.

   No  Go to  4 .

4. CHECK BODY INTEGRATED UNIT VEHICLE SPEED SIGNAL. 

   Stop the vehicle, and read the current data «Front Wheel Speed» of body integrated unit using Subaru Select Monitor. Ref. to BODY CONTROL SYSTEM (DIAGNOSTICS)>READ CURRENT DATA .

   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 working properly. Ref. to SEATS>POWER SEAT System>REMOVAL>POWER SEAT CONTROL MODULE (SEAT WITH MEMORY FUNCTION) .
   3. Turn the ignition switch to ON.
   4. Read the DTC of the power seat control module using the Subaru Select Monitor. Ref. to POWER SEAT MEMORY SYSTEM (DIAGNOSTICS)>Read 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.