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Home >> Ford >> 2004 >> Mustang Mach 1, Standard >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Headlights >> Daytime Running Lamp System >> Diagnosis And Testing >> Daytime Running Lamps (DRL) >> Pinpoint Tests >> Pinpoint Test A: The Daytime Running Lamps Are Inoperative

Pinpoint Test A: The Daytime Running Lamps Are Inoperative

  1. A1 CHECK THE PARKING BRAKE SWITCH SIGNAL CIRCUIT TO THE DRL MODULE FOR SHORT TO GROUND 
    NOTE: Verify the parking brake control is fully released for this step.
    • Key in OFF position.
    • Disconnect: DRL Module C1030.
    • Measure the resistance between DRL module C1030 Pin 6, Circuit 22 (LB/BK), harness side and ground.
      Fig 1: Measuring Resistance Between DRL Module C1030 Pin 6, Circuit 22 (LB/BK)
      G03242733Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. Yes:  GO to  A3.
    2. No:  GO to A2.
  2. A2 CHECK THE PARKING BRAKE SWITCH 
    • Disconnect: Parking Brake Switch C306.
    • Measure the resistance between DRL module C1030 Pin 6, Circuit 22 (LB/BK), harness side and ground.
      Fig 2: Checking Parking Brake Switch
      G03242734Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. Yes:  INSTALL a new parking brake signal switch and bracket. TEST the system for normal operation.
    2. No:  REPAIR the circuit. TEST the system for normal operation.
  3. A3 CHECK VOLTAGE TO THE DRL MODULE 
    • Measure the voltage between DRL module C1030 Pin 2, Circuit 477 (LB/BK), harness side and ground.
      Fig 3: Checking Voltage To DRL Module
      G03242735Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes:  GO to A4.
    2. No:  REPAIR the circuit. TEST the system for normal operation.
  4. A4 CHECK IGNITION SENSE INPUT 
    • Key in ON position.
    • Measure the voltage between DRL module C1030 Pin 3, Circuit 298 (VT/OG), harness side and ground.
      Fig 4: Checking Ignition Sense Input
      G03242736Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : GO to A5
    2. No:  REPAIR the circuit. TEST the system for normal operation.
  5. A5 CHECK THE DRL MODULE GROUND - CIRCUIT 1205 (BK) 
    • Measure the resistance between DRL module C1030 Pin 4, Circuit 1205 (BK), harness side and ground.
      Fig 5: Checking DRL Module Ground - Circuit 1205 (BK)
      G03242737Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes:  GO to A6.
    2. No:  REPAIR the circuit. TEST the system for normal operation.
  6. A6 CHECK THE HIGH BEAM DISABLE INPUT CIRCUIT FOR SHORT TO BATTERY - CIRCUIT 12 (LG/BK) 
    • Measure the voltage between DRL module C1030 Pin 5, Circuit 12 (LG/BK), harness side and ground.
      Fig 6: Checking High Beam Disable Input Circuit For Short To Battery - Circuit 12 (LG/BK)
      G03242738Courtesy of FORD MOTOR CO.
    • Is voltage indicated? 
    1. Yes:  REPAIR the circuit. TEST the system for normal operation.
    2. No:  INSTALL a new DRL module. REFER to MODULE-DAYTIME RUNNING LAMPS (DRL) . TEST the system for normal operation.
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