Subaru Legacy BN/BS (2015-2019) Service Manual: Tire pressure warning light is 25 times blinking and turn on

Subaru Legacy BN/BS (2015-2019) Service Manual / Tire pressure monitoring system (diagnostics) / Tire pressure warning light trouble indicator light illumination pattern / Tire pressure warning light is 25 times blinking and turn on

DETECTING CONDITION:

• Defective TPMS & keyless entry CM or TPMS CM

• Defective harness

• Transmitter is faulty.

TROUBLE SYMPTOM:

Every time the engine starts, tire pressure warning light blinks 25 times and then illuminates.

WIRING DIAGRAM:

NOTE:

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

Tire Pressure Monitoring System Tire Pressure Monitoring System > WIRING DIAGRAM

STEP	CHECK	YES	NO
1.CHECK DTC. Read the DTC of tire pressure monitoring. Read Diagnostic Trouble Code (DTC)	Is DTC displayed-	Perform the diagnosis according to DTC. List of Diagnostic Trouble Code (DTC)	Tire Pressure Warning Light / Trouble Indicator Light Illumination Pattern > TIRE PRESSURE WARNING LIGHT IS 25 TIMES BLINKING AND TURN ON
2.CHECK LAN COMMUNICATION. Inspect LAN system. Basic Diagnostic Procedure > PROCEDURE	Is there any fault-	Repair it according to the diagnosis for LAN system.	Tire Pressure Warning Light / Trouble Indicator Light Illumination Pattern > TIRE PRESSURE WARNING LIGHT IS 25 TIMES BLINKING AND TURN ON
3.CHECK COMMUNICATION LINE. Measure the resistance between TPMS & keyless entry CM connector or TPMS CM connector and body integrated unit connector. Connector & terminal Without push button start (R221) No. 11 — (i81) No. 10: With push button start (R211) No. 11 — (i81) No. 10:	Is the resistance less than 10 --	Tire Pressure Warning Light / Trouble Indicator Light Illumination Pattern > TIRE PRESSURE WARNING LIGHT IS 25 TIMES BLINKING AND TURN ON	Repair open circuit of the harness between TPMS & keyless entry CM connector or TPMS CM connector and body integrated unit connector.
4.CHECK CONNECTOR. Check each connector.	Is there poor contact or any other faults-	Repair the connector.	Replace the TPMS & keyless entry CM or TPMS CM. Tire Pressure Monitoring System

Tire pressure warning light trouble indicator light illumination pattern

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Inspection

(1)Ignition switch(8)Tire inflation pressure warning light (pressure condition)(15)Light OFF(2)OFF(9)Light OFF(16)Blink(3)ON(10)Light ON(17)1 second(4)Start(11)System status(18)Blinks 25 times(5)Tire ...

Other materials:

Electrical specification
Terminal No.ContentMeasured value and measuring conditionsRemarks1 — — — 2 — — — 3 — — — 4Ignition power supply10 — 13 V (when the ignition switch is ON) — 5GND0 V (always) — 6Battery power supply10 — 13 V (always)Without push button start system7 — — — 8 — ...