Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc c1531 bls off stuck

Subaru Legacy BN/BS (2015-2019) Service Manual / Vehicle dynamics control (vdc) (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc c1531 bls off stuck

DTC DETECTING CONDITION:

A fault is detected if stop light switch signal is OFF for a predetermined time or more with the pressure signal of the pressure sensor high.

TROUBLE SYMPTOM:

• VDC does not operate.

• Hill hold does not function.

• EyeSight does not operate. (Models with EyeSight)

WIRING DIAGRAM:

Vehicle dynamics control system Vehicle Dynamics Control System

STEP	CHECK	YES	NO
1.CHECK STOP LIGHT. 1) Turn the ignition switch to OFF. 2) Check the stop light. Stop Light System	Are the stop lights OK-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1531 BLS OFF STUCK	Replace the stop lights. Stop Light System
2.CHECK STOP LIGHT SWITCH. Check the stop light switch. Stop Light Switch > INSTALLATION	Is the installation position of the stop light switch correct-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1531 BLS OFF STUCK	Adjust the installation position of the stop light switch. Stop Light Switch > INSTALLATION
3.CHECK STOP LIGHT SWITCH. 1) Disconnect the stop light switch connector. 2) Measure the resistance of stop light switch terminals. Terminals No. 1 — No. 2:	Is the resistance less than 1 - when the stop light switch is ON (when pedal is depressed)-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1531 BLS OFF STUCK	Replace the stop light switch. Stop Light Switch
4.CHECK STOP LIGHT RELAY. Measure the resistance of stop light relay terminals. Terminals No. 12 — No. 15:	Is the resistance less than 1 --	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1531 BLS OFF STUCK	Replace the stop light relay.
5.CHECK VDCCM&H/U CONNECTOR. Disconnect the connector from the VDCCM&H/U.	Is there poor contact or damage of the VDCCM&H/U connector-	Repair the VDCCM&H/U connector.	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1531 BLS OFF STUCK
6.CHECK STOP LIGHT SWITCH CIRCUIT (CHECK FOR OPEN CIRCUIT). Measure the resistance of stop light switch circuit. Connector & terminal (B310) No. 17 — (B48) No. 15: (B65) No. 2 — (B48) No. 12: (B65) No. 1 — (F/B fuse) No. 37:	Is the resistance less than 1 --	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1531 BLS OFF STUCK	Repair the stop light switch circuit.
7.CHECK STOP LIGHT SWITCH CIRCUIT. 1) Connect all connectors. 2) Turn the ignition switch to ON. 3) Measure the voltage between stop light relay and chassis ground. Connector & terminal (B48) No. 15 (+) — Chassis ground (−):	Is the voltage 10 V or more when the stop light switch is ON (when pedal is depressed)-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1531 BLS OFF STUCK	Repair the stop light switch circuit.
8.CHECK VDCCM&H/U. 1) Perform the Clear Memory Mode. Clear Memory Mode 2) Perform the Inspection Mode. Inspection Mode 3) Read the DTC. Read Diagnostic Trouble Code (DTC)	Is the same DTC displayed-	Replace the VDCCM&H/U. VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1531 BLS OFF STUCK
9.CHECK DETECTION OF OTHER DTCS FOR VDC. Read Diagnostic Trouble Code (DTC)	Is any other DTC displayed-	Perform the diagnosis according to DTC. List of Diagnostic Trouble Code (DTC)	Currently, it is normal. There may have been a poor contact in the harness and connector or a temporarily noise interference.

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