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

WARNING: This page is about a different car, the 2007 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connectors.
NOTE: Some vehicles equipped with an automatic transmission have wiring to the CPP switch, with a jumper plug installed in C257. If the CPP switch wiring and C257 are present, carry out the pinpoint test steps for the CPP circuits as directed in the pinpoint test.
  1. D1 CHECK THE STOPLAMP OPERATION 
    • Apply and release the brake pedal while observing the stoplamp.
    • Do the stoplamp operate correctly?  
    1. YES  : Go to  D2.
    2. NO  : REFER to EXTERIOR LIGHTING to continue diagnosis of the stoplamp.
  2. D2 CHECK THE STOPLAMP SWITCH CIRCUIT 
    • Key in OFF position.
    • Disconnect: Speed Control Actuator C122
      • Fig 1: Measuring Resistance Between Speed Control Actuator C122-4, Circuit CCB15 (BN/GN)
      GF0010773Courtesy of FORD MOTOR CO.
    • Measure the resistance between the speed control actuator C122-4, circuit CCB15 (BN/GN), harness side and the speed control actuator C122-10, circuit GD123 (BK/GY), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new speed control actuator. REFER to Speed Control Actuator . REPEAT the self-test.
    2. NO  : If equipped with a manual transmission or an automatic transmission with CPP wiring, go to  D3 .

      Otherwise, go to  D5 .

  3. D3 CHECK CIRCUIT CCB15 (BN/GN) FOR AN OPEN TO THE CPP SWITCH 
    • Disconnect: CPP Switch (or Jumper Plug) C257
      • Fig 2: Measuring Resistance Between CPP Switch C257-3, Circuit CCB15 (BN/GN) & Ground
      GF0010774Courtesy of FORD MOTOR CO.
    • Measure the resistance between the CPP switch (or jumper plug) C257-3, circuit CCB15 (BN/GN), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  D4.
    2. NO  : Go to  D5.
  4. D4 CHECK CIRCUIT CCB15 (BN/GN) FOR AN OPEN 
      Fig 3: Measuring Resistance Between Speed Control Actuator C122-4, Circuit CCB15 (BN/GN)
      GF0010775Courtesy of FORD MOTOR CO.
    • Measure the resistance between the speed control actuator C122-4, circuit CCB15 (BN/GN), harness side and the CPP switch (or jumper plug) C257-4, circuit CCB15 (BN/GN), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new CPP switch (or jumper plug). REFER to ELECTRONIC ENGINE CONTROLS . REPEAT the self-test.
    2. NO  : REPAIR the circuit. REPEAT the self-test.
  5. D5 CHECK CIRCUIT GD161 (BK/YE) FOR AN OPEN 
    • Disconnect: Stoplamp Switch C278
      • Fig 4: Measuring Resistance Between Stoplamp Switch C278-5, Circuit GD161 (BK/YE) & Ground
      GF0010776Courtesy of FORD MOTOR CO.
    • Measure the resistance between the stoplamp switch C278-5, circuit GD161 (BK/YE), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  D6.
    2. NO  : REPAIR the circuit. REPEAT the self-test.
  6. D6 CHECK THE STOPLAMP SWITCH 
    • Disconnect: Stoplamp Switch C278
      • Fig 5: Installing Fused (5A) Jumper Wire Between Stoplamp Switch C278-4, Circuit CCB15 (BN/GN)
      GF0010777Courtesy of FORD MOTOR CO.
    • Install a fused (5A) jumper wire between the stoplamp switch C278-4, circuit CCB15 (BN/GN), harness side and the stoplamp switch C278-5, circuit GD161 (BK/YE), harness side.
      • Fig 6: Measuring Resistance Between Speed Control Actuator C122-4, Circuit CCB15 (BN/GN)
      GF0010773Courtesy of FORD MOTOR CO.
    • Measure the resistance between the speed control actuator C122-4, circuit CCB15 (BN/GN), harness side and the speed control actuator, circuit GD123 (BK/GY), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new stoplamp switch. REFER to EXTERIOR LIGHTING . REPEAT the self-test.
    2. NO  : REPAIR the circuit. REPEAT the self-test.
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