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Pinpoint Test L: DTC C1105

  1. L1 CHECK STOPLAMP OPERATION 
    • Press the brake pedal and verify the correct operation of the stoplamps.
    • Are the stoplamps illuminated only when the brake pedal is pressed? 
  2. L2 TEST THE STOPLAMP RELAY 
    • Disconnect: Adaptive Cruise Control Stoplamp Relay.
    • Measure the resistance between Adaptive Cruise Control stoplamp relay pin-1 and pin-2, component side.
    • Is the resistance between 63 and 120 ohms? 
      • Yes  : GO to L3.
      • No  : INSTALL a new stoplamp relay. CLEAR the DTCs. REPEAT the self-test.
  3. L3 CHECK FOR VOLTAGE AT THE STOPLAMP RELAY CONTROL COIL 
    • Ignition ON.
    • Measure the voltage between stoplamp relay cavity 2, circuit CBP34 (VT/BN) and ground.
      Fig 1: Measuring Voltage Between Stoplamp Relay Cavity 2, Circuit CBP34 (VT/BN) And Ground
      G06280761Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
      • Yes  : GO to L4.
      • No  : VERIFY Battery Junction Box (BJB) fuse 13 (15A) is OK. If OK, REPAIR circuit CBP34 (VT/BN). If not OK, REFER to the SYSTEM WIRING DIAGRAMS to identify the possible causes of the circuit short. CLEAR the DTCs. REPEAT the self-test.
  4. L4 CHECK THE STOPLAMP RELAY CONTROL GROUND CIRCUIT FOR AN OPEN 
    • Disconnect: ABS Module C135.
    • Measure the resistance between stoplamp relay cavity 1, circuit CLS44 (VT/BN) and ABS module C135-36, circuit CLS44 (VT/BN), harness side.
      Fig 2: Measuring Resistance Between Stoplamp Relay Cavity 1, Circuit CLS44 (VT/BN) And ABS Module C135-36, Circuit CLS44 (VT/BN), Harness Side
      G08011704Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
      • Yes  : GO to L5.
      • No  : REPAIR circuit CLS44 (VT/BN). CLEAR the DTCs. REPEAT the self-test.
  5. L5 CHECK THE STOPLAMP RELAY CONTROL GROUND CIRCUIT FOR A SHORT TO GROUND 
    • Measure the resistance between stoplamp relay cavity 1, circuit CLS44 (VT/BN) and ground.
      Fig 3: Measuring Resistance Between Stoplamp Relay Cavity 1, Circuit CLS44 (VT/BN) And Ground
      G06759931Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10, 000 ohms? 
      • Yes  : GO to L6.
      • No  : REPAIR circuit CLS44 (VT/BN). CLEAR the DTCs. REPEAT the self-test.
  6. L6 CHECK THE STOPLAMP RELAY CONTROL GROUND CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition ON.
    • Measure the voltage between stoplamp relay cavity 1, circuit CLS44 (VT/BN) and ground.
      Fig 4: Measuring Voltage Between Stoplamp Relay Cavity 1, Circuit CLS44 (VT/BN) And Ground
      G06280758Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
      • Yes  : REPAIR circuit CLS44 (VT/BN). CLEAR the DTCs. REPEAT the self-test.
      • No  : GO to L7.
  7. L7 CHECK FOR CORRECT ABS MODULE OPERATION 
    • Disconnect: ABS Module C135.
    • Check for:
      • corrosion.
      • pushed-out pins.
      • spread terminals.
    • Connect: ABS Module C135.
    • Make sure that the connector is correctly seated.
    • Connect the scan tool.
    • Using the scan tool, clear all ABS module DTCs.
    • Enter the following diagnostic mode on the scan tool: Self Test - ABS Module.
    • Retrieve and record all ABS module DTCs.
    • Is the DTC C1105 still present? 
      • Yes  : INSTALL a new ABS module. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE . CLEAR the DTCs. CYCLE the ignition key. REPEAT the self-test.
      • No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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