Pinpoint Test I: All The STOPLAMPS Are Inoperative

WARNING: This page is about a different car, the 2010 Lincoln MKX and 2010 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

I1 CHECK FOR VOLTAGE TO THE STOPLAMP SWITCH
- Ignition OFF.
- Disconnect: Stoplamp Switch C2064.
- Measure the voltage between the stoplamp switch C2064-1, circuit SBB71 (WH/RD), harness side and ground.
  
  Fig 1: Measuring Voltage Between Stoplamp Switch C2064-1, Circuit SBB71 (WH/RD) And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes: GO to I2 .
- No: VERIFY the BJB fuse 71 (10A) is OK. If OK, REPAIR circuit SBB71 (WH/RD) for an open. TEST the system for normal operation. If not OK, REFER to the SYSTEM WIRING DIAGRAMS for Edge or SYSTEM WIRING DIAGRAMS for MKX to identify the possible causes of the circuit short.
I2 BYPASS THE STOPLAMP SWITCH
- Connect a fused jumper wire between the stoplamp switch C2064-1, circuit SBB71 (WH/RD), harness side and the stoplamp switch C2064-4, circuit CCB08 (VT/WH), harness side.
  
  Fig 2: Connecting Fused Jumper Wire Between Stoplamp Switch C2064-1, Circuit SBB71 (WH/RD) And C2064-4, Circuit CCB08 (VT/WH)
  Courtesy of FORD MOTOR CO.
- Are the stoplamps illuminated?
- Yes: REMOVE the jumper wire. INSTALL a new stoplamp switch. REFER to STOPLAMP SWITCH . TEST the system for normal operation.
- No: REMOVE the jumper wire. REPAIR circuit CCB08 (VT/WH) for an open. TEST the system for normal operation.