Pinpoint Test G: Flash Code 2 - STOPLAMP Switch Circuit Failure

G1 CHECK THE STOPLAMP OPERATION
- Apply and release the brake pedal while observing the stoplamps.
- Do the stoplamps operate correctly?
Yes : GO to G2.

No : REFER to EXTERIOR LIGHTING to continue diagnosis of the stoplamps.
G2 CHECK THE STOPLAMP BULBS
- Check the stoplamps for the presence of aftermarket LED lights.
- Are the correct stoplamp bulbs installed?
Yes : GO to G3.

No : INSTALL the correct stoplamp bulbs. TEST the system for normal operation.
G3 CHECK CIRCUIT 511 (LG) FOR AN OPEN
- Disconnect: Speed Control Actuator C122.
- While applying the brake pedal, measure the voltage between the speed control actuator C122-4, circuit 511 (LG), harness side and ground.
  
  Fig 1: Checking Circuit 511 (LG) For An 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. REPEAT the self-test.

No : REPAIR the circuit. REPEAT the self-test.