Subaru Legacy BN/BS (2015-2019) Service Manual: Brake warning light does not go off

Subaru Legacy BN/BS (2015-2019) Service Manual / Vehicle dynamics control (vdc) (diagnostics) / Warning light illumination pattern / Brake warning light does not go off

DETECTING CONDITION:

• Brake warning light circuit is shorted.

• Defective sensor/connector

• Defective CAN communication

TROUBLE SYMPTOM:

After starting the engine, the brake warning light continues to illuminate.

WIRING DIAGRAM:

NOTE:

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

Parking brake / brake fluid level warning light system Parking Brake / Brake Fluid Level Warning Light System

STEP	CHECK	YES	NO
1.CHECK INSTALLATION OF VDCCM&H/U CONNECTOR. 1) Turn the ignition switch to OFF. 2) Check that the VDCCM&H/U connector is inserted until it is locked by clamp.	Is the connector firmly inserted-	Warning Light Illumination Pattern > BRAKE WARNING LIGHT DOES NOT GO OFF	Insert the VDCCM&H/U connector until it is locked by clamp.
2.READ DTC. Read the DTC. Read Diagnostic Trouble Code (DTC)	Is DTC displayed-	Perform the diagnosis according to DTC. List of Diagnostic Trouble Code (DTC)	Warning Light Illumination Pattern > BRAKE WARNING LIGHT DOES NOT GO OFF
3.CHECK BRAKE FLUID AMOUNT. Check the amount of brake fluid in the reservoir tank of master cylinder.	Does the level of the brake fluid amount fall between the lines of “MAX” and “MIN”-	Warning Light Illumination Pattern > BRAKE WARNING LIGHT DOES NOT GO OFF	Replenish brake fluid to the specified value.
4.CHECK BRAKE FLUID LEVEL SWITCH. 1) Turn the ignition switch to OFF. 2) Disconnect the level switch connector (B16) from master cylinder. 3) Measure the resistance of master cylinder terminals. Terminals No. 1 — No. 2:	Is the resistance 1 M- or more-	Warning Light Illumination Pattern > BRAKE WARNING LIGHT DOES NOT GO OFF	Replace the master cylinder. Master Cylinder
5.CHECK GROUND SHORT OF HARNESS. 1) Disconnect the connector from the combination meter. 2) Measure the resistance between combination meter connector and chassis ground. Connector & terminal (i10) No. 23 — Chassis ground:	Is the resistance 1 M- or more-	Warning Light Illumination Pattern > BRAKE WARNING LIGHT DOES NOT GO OFF	Repair the harness connector between combination meter and brake fluid level switch.
6.CHECK LAN SYSTEM. Perform the diagnosis for LAN system. Basic Diagnostic Procedure	Is there any fault in LAN system-	Perform the diagnosis according to DTC for LAN system. List of Diagnostic Trouble Code (DTC)	Warning Light Illumination Pattern > BRAKE WARNING LIGHT DOES NOT GO OFF
7.CHECK COMBINATION METER. Check the combination meter. Combination Meter System > OPERATION	Is combination meter OK-	Replace the VDCCM&H/U. VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)	Replace the combination meter. Combination Meter

Warning light illumination pattern

...

Inspection

(1)Ignition switch(7)VDC OFF indicator light(13)VDC warning light & VDC indicator light(2)OFF(8)Electronic parking brake warning light(14)2 seconds or more(3)ON(9)Hill hold indicator light(15)Electron ...

Other materials:

Installation
CAUTION:• If the airbag has been activated, replace the front sub sensor with a new part.• Do not reuse the bolt and nut.Always replace with the specified new bolts and nuts.• When installing the sensor, insert the set pin on the backside of the sensor into the hole on the body sid ...