Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc b2602 vehicle speed control

Subaru Legacy BN/BS (2015-2019) Service Manual / Power seat memory system (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / 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.)

STEP	CHECK	YES	NO
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. Read Diagnostic Trouble Code (DTC)	Is DTC B2602 displayed- (Current malfunction)	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2602 VEHICLE SPEED CONTROL	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. Basic Diagnostic Procedure > PROCEDURE	Is there any fault-	Perform the inspection according to the diagnosis for LAN system.	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2602 VEHICLE SPEED CONTROL
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. Subaru Select Monitor > OPERATION	Is the displayed value abnormal-	Replace the VDC module, or inspect the vehicle speed sensor harness circuit.	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2602 VEHICLE SPEED CONTROL
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. Read Current Data	Is the displayed value abnormal-	Replace the body integrated unit. Body Integrated Unit	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2602 VEHICLE SPEED CONTROL
5.CHECK POWER SEAT CONTROL MODULE. 1) Turn the ignition switch to OFF. 2) Replace with a power seat control module working properly. Power Seat System > REMOVAL 3) Turn the ignition switch to ON. 4) Read the DTC of the power seat control module using the Subaru Select Monitor. Read Diagnostic Trouble Code (DTC)	Is DTC B2602 displayed- (Current malfunction)	Replace the body integrated unit. Body Integrated Unit	There was an abnormality in power seat control module.

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