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Home >> Mercury >> 2010 >> Milan Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 818 (Exterior Lighting System (F250-F550)) >> Diagnostic Tests >> Daytime Running Lamps (DRL) >> Pinpoint Tests >> Pinpoint Test AE: The Daytime Running Lamps (DRL) Are On With The Parking Brake Set >> Pinpoint Test AE: The Daytime Running Lamps Are On With The Parking Brake Set

Pinpoint Test AE: The Daytime Running Lamps Are On With The Parking Brake Set

WARNING: This page is about a different car, the 2007 Ford Pickup, 2007 Ford F550 Super Duty, 2007 Ford F450 Super Duty, and 2007 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. AE1 CHECK THE DRL PARKING BRAKE RELAY CIRCUIT 
    • Apply the parking brake.
    • Key in ON position.
    • Disconnect: DRL Relay 1 C1171
    • Do the DRL continue to illuminate? 
    1. YES  : Go to  AE4.
    2. NO  : Go to  AE2.
  2. AE2 CHECK CIRCUIT 162 (LG/RD) FOR AN OPEN 
    • Key in OFF position.
      • Fig 1: Checking Circuit For Open
      GF0008353Courtesy of FORD MOTOR CO.
    • Measure the resistance between the DRL 1 relay C1171-2, circuit 162 (LG/RD), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  AE3.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  3. AE3 CHECK CIRCUIT 295 (LB/PK) FOR AN OPEN 
    • Key in ON position.
      • Fig 2: Checking Circuit For Open
      GF0008331Courtesy of FORD MOTOR CO.
    • Measure the resistance between the DRL 1 relay C1171-1, circuit 295 (LB/PK), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : INSTALL a new DRL 1 relay. TEST the system for normal operation.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  4. AE4 CHECK CIRCUIT 175 (BK/YE) FOR A SHORT TO POWER 
    • Disconnect: DRL Relay 2 C1172
    • Do the DRL continue to illuminate? 
    1. YES  : Go to  AE5.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  5. AE5 CHECK CIRCUIT 1032 (WH/BK) FOR A SHORT TO POWER 
    • Disconnect: DRL Relay 3 C1000
    • Carry out the relay component test for the DRL relay 3. Refer to COMPONENT TESTING article.
    • Is the DRL relay 3 OK? 
    1. YES  : REPAIR the circuit. TEST the system for normal operation.
    2. NO  : INSTALL a new DRL relay 3. TEST the system for normal operation.
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