Subaru Legacy BN/BS (2015-2019) Service Manual: General diagnostic table inspection

Subaru Legacy BN/BS (2015-2019) Service Manual / Tire pressure monitoring system (diagnostics) / General diagnostic table inspection

Symptoms		Faulty parts
Tire pressure warning light illuminates.	Tire pressure is reduced.	• Improper tire pressure adjustment • Punctured tire
Tire pressure warning light blinks 25 times and then illuminates.	Tire pressure monitoring system has malfunction.	• Air pressure sensor malfunction • Air pressure sensor is out of battery. • Defective TPMS & keyless entry CM or TPMS CM • Defective vehicle harness • Defective combination meter
Tire pressure is dropping but the warning light does not illuminate.	Tire pressure warning light does not illuminate.	• Air pressure sensor is faulty. • Defective TPMS & keyless entry CM or TPMS CM • Defective combination meter

Electrical component location location

(1)Tire pressure warning light(2)TPMS & keyless entry CM*1 or TPMS CM*2(3)Snap-in type transmitter*1: Without push button start*2: With push button start ...

Inspection mode procedure

Reproduce the malfunction occurrence condition as much as possible. Drive the vehicle at 40 km/h (25 MPH) or faster for at least ten minutes. ...

Other materials:

Inspection mode procedure
Perform the diagnosis shown in the following DTC table.When performing the diagnosis not listed in “List of Diagnostic Trouble Code (DTC)”, refer to the item on the drive cycle. Drive CycleDTCItemConditionB1570ANTENNA — B1571REFERENCE CODE INCOMPATIBILITY (IMMOBILIZER CM TO ECM) — B ...