Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc c1921 parking position switch circuit

Subaru Legacy BN/BS (2015-2019) Service Manual / Vehicle dynamics control (vdc) (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc c1921 parking position switch circuit

DTC DETECTING CONDITION:

• A fault is detected if the switch was positioned at lock or release continuously for 90 seconds while the vehicle is stopped.

• A fault is detected if an irregular switch condition continues for a predetermined period of time immediately after the switch position is changed. A fault is also detected if the switch condition is not confirmed afterwards.

• A fault is detected if the switch harness is open or shorted.

TROUBLE SYMPTOM:

Parking brake system does not operate.

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 OPERATION OF ELECTRONIC PARKING BRAKE. Operate the parking brake switch.	Does the electronic parking brake operate properly-	Ask the customer whether the switch operation was performed normally. If it was normal, temporary poor contact is the cause.	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1921 PARKING POSITION SWITCH CIRCUIT
2.CHECK HARNESS (CHECK FOR OPEN CIRCUIT). 1) Turn the ignition switch to OFF. 2) Disconnect the connectors from the VDCCM&H/U and parking brake switch. 3) Measure the resistance between VDCCM&H/U and parking brake switch connector. Connector & terminal (B310) No. 19 — (i163) No. 2: (B310) No. 20 — (i163) No. 1: (B310) No. 21 — (i163) No. 5: (B310) No. 26 — (i163) No. 6:	Is the resistance less than 1 --	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1921 PARKING POSITION SWITCH CIRCUIT	Repair harness and connector between VDCCM&H/U and parking brake switch connector.
3.CHECK HARNESS (CHECK FOR GROUND SHORT CIRCUIT). Measure the resistance between the parking brake switch connector and chassis ground. Connector & terminal (i163) No. 2 — Chassis ground: (i163) No. 1 — Chassis ground: (i163) No. 5 — Chassis ground: (i163) No. 6 — Chassis ground:	Is the resistance 1 M- or more-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1921 PARKING POSITION SWITCH CIRCUIT	Repair ground short of harness between VDCCM&H/U and parking brake switch connector.
4.CHECK HARNESS (CHECK FOR SHORT CIRCUIT TO POWER SUPPLY). 1) Turn the ignition switch to ON. 2) Measure the voltage between parking brake switch connector and chassis ground. Connector & terminal (i163) No. 2 (+) — Chassis ground (−): (i163) No. 1 (+) — Chassis ground (−): (i163) No. 5 (+) — Chassis ground (−): (i163) No. 6 (+) — Chassis ground (−):	Is the voltage less than 1 V-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1921 PARKING POSITION SWITCH CIRCUIT	Repair short to power supply of harness between VDCCM&H/U and parking brake switch connector.
5.CHECK PARKING BRAKE SWITCH. Check the parking brake switch. Parking Brake Switch > INSPECTION	Is the parking brake switch normal-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1921 PARKING POSITION SWITCH CIRCUIT	Replace the parking brake switch. Parking Brake Switch
6.CHECK VDCCM&H/U. 1) Connect all connectors. 2) Perform the Clear Memory Mode. Clear Memory Mode 3) Perform the Inspection Mode. Inspection Mode 4) 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 C1921 PARKING POSITION SWITCH CIRCUIT
7.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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