Pinpoint Test B: Flash Code 2 - STOPLAMP Switch Or Circuit Failure

B1 CHECK THE STOPLAMP OPERATION
- Press the brake pedal.
- Do the stoplamps come on?
Yes : GO to B2.

No : REFER to EXTERIOR LIGHTING to continue diagnosis of the stoplamps.
B2 CHECK CIRCUIT 810 (RD/LG) FOR A SHORT TO VOLTAGE
- Key in OFF position.
- Disconnect: Speed Control Actuator C122.
- Key in ON position.
- Measure the voltage between the speed control actuator C122-4, circuit 810 (RD/LG), harness side, and the speed control actuator C122-10, circuit 57 (BK), harness side.
  
  Fig 1: Checking Circuit 810 (RD/LG) For Short To Voltage
  Courtesy of FORD MOTOR CO.
- Is any voltage indicated?
Yes : REPAIR the circuit. TEST the system for normal operation.

No : GO to B3.
B3 CHECK CIRCUIT 810 (RD/LG) FOR AN OPEN
- Measure the voltage between the speed control actuator C122-4, circuit 810 (RD/LG), harness side, and the speed control actuator C122-10, circuit 57 (BK), harness side, while pressing the brake pedal.
  
  Fig 2: Checking Circuit 810 (RD/LG) For Open
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
Yes : INSTALL a new speed control actuator. REFER to SPEED CONTROL ACTUATOR in this article. TEST the system for normal operation.

No : REPAIR the circuit. TEST the system for normal operation.