DTC C0116 Faulty Stop Light Switch: Wiring Diagram

Fig 1: Faulty Stop Light Switch - Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

STOP LIGHT SWITCH DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK OUTPUT OF STOP LIGHT SWITCH USING SUBARU SELECT MONITOR. Select {Current Data Display & Save} in the Subaru Select Monitor. Release the brake pedal. Read the stop light switch signal in Subaru Select Monitor.	Is "OFF displayed on the screen?	Go to step 2.	Go to step 3.
2 CHECK OUTPUT OF STOP LIGHT SWITCH USING SUBARU SELECT MONITOR. Depress the brake pedal. Read the stop light switch output in Subaru Select Monitor.	Is "ON" displayed on the screen?	Go to step 6.	Go to step 3.
3 CHECK IF STOP LIGHTS COME ON. Depress the brake pedal.	Does the stop light illuminate?	Go to step 4.	Repair the stop light circuit.
4 CHECK FUSE. Check the fuse (B225).	Is the fuse OK?	Go to step 5.	Replace the fuse.
5 CHECK OPEN CIRCUIT IN HARNESS. Turn the ignition switch to OFF. Disconnect the ABSCM&H/U connectors. Depress the brake pedal. Measure the voltage between ABSCM&H/U connector and chassis ground. Connector & terminal (B301) No. 20 (+) - Chassis ground (-):	Is the voltage 10 - 15 V?	Go to step 6.	Repair the harness between stop light switch and ABSCM&H/U connector.
6 CHECK POOR CONTACT IN CONNECTOR.	Is there poor contact in the connector between stop light switch and ABSCM&H/U?	Repair the connector.	Go to step 7.
7 CHECK ABSCM&H/U. Connect all connectors. Erase the memory. Perform the Inspection Mode. Read the DTC.	Is the same DTC displayed?	Replace the ABSCM only. <Ref. to REPLACEMENT , ABS Control Module and Hydraulic Control Unit (ABSCM&H/U).>	Go to step 8.
8 CHECK FOR ANY OTHER DTC ON DISPLAY.	Is any other DTC displayed?	Check DTC using "List of Diagnostic Trouble Code (DTC)". <Ref. to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >	Temporary poor contact occurs.