Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc b2606 power seat position sensor circuit low

Subaru Legacy BN/BS (2015-2019) Service Manual / Power seat memory system (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc b2606 power seat position sensor circuit low

DTC DETECTING CONDITION:

Short circuit in the pulse sensor is detected during the motor operation for a certain period of time (12 ms) or more.

TROUBLE SYMPTOM:

• Seat memory does not operate.

• Seat operation stops immediately after manual operation is performed.

WIRING DIAGRAM:

NOTE:

For the coupling connector, refer to “WIRING SYSTEM”.

Power seat system Power Seat System > WIRING DIAGRAM

STEP	CHECK	YES	NO
1.CHECK DTC. 1) Perform the clear memory operation. Clear Memory Mode > OPERATION 2) Turn the ignition switch to OFF. 3) Disconnect, and then connect the power seat control module connector. 4) Turn the ignition switch to ON. 5) Move the power seat. 6) Read the DTC of the power seat control module using the Subaru Select Monitor. Read Diagnostic Trouble Code (DTC)	Is DTC B2606 displayed- (Current malfunction)	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2606 POWER SEAT POSITION SENSOR CIRCUIT LOW	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 HARNESS (GROUND SHORT CIRCUIT). 1) Turn the ignition switch to OFF. 2) Disconnect the power seat control module connector. 3) Disconnect the connectors of all motors (slide/tilt/lifter/reclining). 4) Using the tester, measure the resistance between power seat control module connector and chassis ground. Connector & terminal (R156) No. 9 — Chassis ground:	Is the resistance 1 M- or more-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2606 POWER SEAT POSITION SENSOR CIRCUIT LOW	Repair or replace the short circuit to ground in harness between power seat control module connector and motor connector.
3.CHECK SLIDE MOTOR. 1) Connect the slide motor connector. 2) Using the tester, measure the resistance between power seat control module connector and chassis ground. Connector & terminal (R156) No. 9 — Chassis ground:	Is the resistance 1 M- or more-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2606 POWER SEAT POSITION SENSOR CIRCUIT LOW	Replace the seat cushion frame assembly. Front Seat > DISASSEMBLY
4.CHECK TILT MOTOR. 1) Disconnect the slide motor connector. 2) Connect the tilt motor connector. 3) Using the tester, measure the resistance between power seat control module connector and chassis ground. Connector & terminal (R156) No. 9 — Chassis ground:	Is the resistance 1 M- or more-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2606 POWER SEAT POSITION SENSOR CIRCUIT LOW	Replace the seat cushion frame assembly. Front Seat > DISASSEMBLY
5.CHECK LIFTER MOTOR. 1) Disconnect the tilt motor connector. 2) Connect the lifter motor connector. 3) Using the tester, measure the resistance between power seat control module connector and chassis ground. Connector & terminal (R156) No. 9 — Chassis ground:	Is the resistance 1 M- or more-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2606 POWER SEAT POSITION SENSOR CIRCUIT LOW	Replace the seat cushion frame assembly. Front Seat > DISASSEMBLY
6.CHECK RECLINING MOTOR. 1) Disconnect the lifter motor connector. 2) Connect the reclining motor connector. 3) Using the tester, measure the resistance between power seat control module connector and chassis ground. Connector & terminal (R156) No. 9 — Chassis ground:	Is the resistance 1 M- or more-	Replace the power seat control module. Power Seat System > REMOVAL	Replace the backrest frame assembly. Front Seat > DISASSEMBLY

Diagnostic procedure with diagnostic trouble code (dtc)

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