Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc b14b2 seat heater thermistor circuit short-circuit (driver)

Subaru Legacy BN/BS (2015-2019) Service Manual / Hvac system (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc b14b2 seat heater thermistor circuit short-circuit (driver)

DTC DETECTING CONDITION:

Short-circuit in seat heater thermistor.

TROUBLE SYMPTOM:

Seat heater LH does not function.

WIRING DIAGRAM:

NOTE:

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

Seat Heater System Seat Heater System > WIRING DIAGRAM

STEP	CHECK	YES	NO
1.CHECK CONNECTOR. 1) Check connecting condition of the A/C CM connector, seat heater relay connector, seat connector and coupling connector. 2) Read the DTC using Subaru Select Monitor. Read Diagnostic Trouble Code (DTC)	Is B14B2 displayed-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B14B2 SEAT HEATER THERMISTOR CIRCUIT SHORT-CIRCUIT (DRIVER)	Even if DTC is displayed, the circuit has returned to a normal condition at this time. Reproduce the failure, and then 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 SEAT HEATER LH. 1) Disconnect the seat connector. 2) Read the DTC using Subaru Select Monitor. Read Diagnostic Trouble Code (DTC)	Is B14B1 displayed-	Replace the seat heater module. Seat Heater System > REMOVAL	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B14B2 SEAT HEATER THERMISTOR CIRCUIT SHORT-CIRCUIT (DRIVER)
3.CHECK HARNESS. 1) Turn the ignition switch to ON. 2) Turn the seat heater switch LH to ON. 3) Using the tester, measure the voltage between terminals. Connector & terminal (R341) No. 2 (+) — (R341) No. 6 (−):	Is the voltage 4.5 — 5.0 V-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B14B2 SEAT HEATER THERMISTOR CIRCUIT SHORT-CIRCUIT (DRIVER)	Repair or replace the open circuit of harness.
4.CHECK HARNESS (SHORTED BETWEEN LINES AND SHORTED TO GROUND). 1) Disconnect the A/C CM connector. 2) Using a tester, check continuity between terminals. Connector & terminal (R341) No. 2 — (R341) No. 6: (R341) No. 2 — Chassis ground:	Is there continuity-	Repair or replace the short circuit of the harness.	Replace the A/C CM. Control Unit > REMOVAL

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Other materials:

Installation
1. Before installation, inspect the following items and replace any faulty part with a new part.• The front door impact sensor or connector is damaged.• Inner panel area of the panel assembly - front door is deformed.• Plate - door is deformed.• Side airbag module has been ac ...