ABS (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC C0116 FAULTY STOP LIGHT SWITCH

DTC DETECTING CONDITION:

Defective stop light switch

WIRING DIAGRAM:

• LHD model

• RHD model

STEPCHECKYESNO

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

1) Select “Current Data Display & Save” on the Subaru Select Monitor.

2) Release the brake pedal.

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

Is “OFF” displayed on the screen?

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

1) Depress the brake pedal.

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

Is “ON” displayed on the screen?

3.CHECK IF STOP LIGHTS ILLUMINATE.

Depress the brake pedal.

Does the stop light illuminate?

Repair the stop light circuit.

4.CHECK FUSE.

Check the fuse (B225) in the relay block.

Is the fuse OK?

Replace the fuse.

5.CHECK OPEN CIRCUIT IN HARNESS.

1) Turn the ignition switch to OFF.

2) Disconnect the ABSCM&H/U connectors.

3) Depress the brake pedal.

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

Connector & terminal

(B301) No. 20 (+) — Chassis ground (−):

Is the voltage 10 — 15 V?

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

6.CHECK POOR CONTACT OF CONNECTOR.

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

Repair the connector.

7.CHECK ABSCM&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 ABSCM only.

8.CHECK FOR ANY OTHER DTC ON DISPLAY.

Is any other DTC displayed?

Check DTC using “List of Diagnostic Trouble Code (DTC)”.

Temporary poor contact occurs.