Pinpoint Test AG: The Daytime Running Lamps Are Inoperative

WARNING: This page is about a different car, the 2004 Mercury Mountaineer and 2004 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

AG1 CHECK DRL MODULE OUTPUT
- Key in OFF position.
- Disconnect: DRL Relay C1000.
- Proceed to Step AG2.
- Key in ON position.
- Make sure the headlamp switch is in the OFF position and the parking brake is not applied.
- Measure the voltage between the DRL relay C1000-4, circuit 13 (RD/BK), harness side and ground.
  
  Fig 1: Checking DRL Module Output
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
AG2 CHECK CIRCUIT 13 (RD/BK) FOR AN OPEN
- Key in OFF position.
- Disconnect: DRL Module C1030.
- Measure the resistance between the DRL module C1030-1, circuit 13 (RD/BK), harness side and the DRL relay C1000-4 (early build), circuit 13 (RD/BK), harness side; or between the DRL module C1030-1, circuit 13 (RD/BK), harness side and the DRL relay C1000-5 (late build), circuit 13 (RD/BK), harness side.
  
  Fig 2: Checking Circuit 13 (RD/BK) For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes

GO to AG3.

No

REPAIR the circuit. TEST the system for normal operation.
AG3 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.
- Measure the resistance between the DRL module C1030-6, circuit 162 (LG/RD), harness side and ground.
  
  Fig 3: Checking Parking Brake Switch Signal Circuit To DRL Module For Short To Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
Yes

GO to AG4.

No

REPAIR the circuit. TEST the system for normal operation.
AG4 CHECK VOLTAGE TO THE DRL MODULE
- Measure the voltage between the DRL module C1030-2, circuit 434 (LB/BK), harness side and ground.
  
  Fig 4: Checking Voltage To DRL Module
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
Yes

GO to AG5.

No

REPAIR the circuit. TEST the system for normal operation.
AG5 CHECK IGNITION SENSE INPUT
- Key in ON position.
- Measure the voltage between the DRL module C1030-3, circuit 932 (GY/WH), harness side and ground.
  
  Fig 5: Checking Ignition Sense Input
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
Yes

GO to AG6.

No

REPAIR the circuit. TEST the system for normal operation.
AG6 CHECK THE DRL MODULE GROUND - CIRCUIT 1203 (BK/LB)
- Measure the resistance between the DRL module C1030-4, circuit 1203 (BK/LB), harness side and ground.
  
  Fig 6: Checking DRL Module Ground - Circuit 1203 (BK/LB)
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes

GO to AG7.

No

REPAIR the circuit. TEST the system for normal operation.
AG7 CHECK THE HIGH BEAM DISABLE INPUT CIRCUIT FOR SHORT TO BATTERY - CIRCUIT 12 (LG/BK)
- Measure the voltage between the DRL module C1030-5, circuit 12 (LG/BK), harness side and ground.
  
  Fig 7: Checking High Beam Disable Input Circuit For Short To Battery - Circuit 12 (LG/BK)
  Courtesy of FORD MOTOR CO.
- Is any voltage indicated?
Yes

REPAIR the circuit. TEST the system for normal operation.

No

INSTALL a new DRL module. REFER to DAYTIME RUNNING LAMP (DRL) MODULE . TEST the system for normal operation.