VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC C0054 BLS CIRCUIT OPEN

DTC DETECTING CONDITION:

Defective stop light switch

TROUBLE SYMPTOM:

• ABS does not operate.

• VDC does not operate.

WIRING DIAGRAM:

STEPCHECKYESNO

1.CHECK OUTPUT OF STOP LIGHT SWITCH WITH SUBARU SELECT MONITOR.

1) Select {Current Data Display & Save} in Subaru Select Monitor.

2) Release the brake pedal.

3) Read the stop light switch output in Subaru Select Monitor.

Is OFF displayed on the display screen?

2.CHECK OUTPUT OF STOP LIGHT SWITCH WITH SUBARU SELECT MONITOR.

1) Depress the brake pedal.

2) Read the stop light switch output in Subaru Select Monitor.

Is ON displayed on the display screen?

3.CHECK IF STOP LIGHTS ILLUMINATE.

Depress the brake pedal.

Does the stop light illuminate?

Repair the stop light circuit.

4.CHECK FUSE OR RELAY.

Check the fuse (B225) in the relay block.

Is the fuse OK?

Replace the fuse.

5.CHECK OPEN CIRCUIT OF HARNESS.

1) Turn the ignition switch to OFF.

2) Disconnect the connector from the VDCCM&H/U.

3) Depress the brake pedal.

4) Measure the voltage between VDCCM&H/U connector and chassis ground.

Connector & terminal

(B310) No. 30 (+) — Chassis ground (−):

Is the voltage 10 — 15 V?

Repair the harness between stop light switch and VDCCM&H/U connector.

6.CHECK POOR CONTACT OF CONNECTORS.

Is there poor contact of connector between stop light switch and VDCCM&H/U?

Repair the connector.

7.CHECK VDCCM&H/U.

1) Connect all connectors.

2) Clear the memory.

3) Perform the Inspection Mode.

4) Read the DTC.

Is the same DTC displayed?

Replace the VDCCM only.

8.CHECK OTHER DTC DETECTION.

Is any other DTC displayed?

Perform the diagnosis according to DTC.

Temporary poor contact occurs.