Pinpoint Test B: The Daytime Running Lamps (DRL) Are On With The Ignition Switch Off

B1 CHECK THE DRL SYSTEM FOR A SHORT TO VOLTAGE
- Key in OFF position.
- Disconnect: Low Beam Relay C1049.
- Measure the voltage between the low beam relay C1049-4, circuit 15S-LE8 (GN/RD), harness side and ground.
  
  Fig 1: Checking DRL System For Short To Voltage
  Courtesy of FORD MOTOR CO.
- Is any voltage present?
Yes : For early build vehicles, GO to B2.

For late build vehicles, GO to B6.

No : REFER to EXTERIOR LIGHTING to continue diagnosis of the headlamps.
B2 CHECK CIRCUIT 15S-LE8 (GN/RD) FOR A SHORT TO VOLTAGE (EARLY BUILD)
- Disconnect: DRL Relay C1000.
- Measure the voltage between the low beam relay C1049-4, circuit 15S-LE8 (GN/RD), harness side and ground.
  
  Fig 2: Checking Circuit 15S-LE8 (GN/RD) For Short To Voltage (Early Build)
  Courtesy of FORD MOTOR CO.
- Is any voltage present?
Yes : REPAIR the circuit. TEST the system for normal operation.

No : GO to B3.
B3 CHECK THE DRL RELAY (EARLY BUILD)
- Measure the voltage between the DRL relay C1000-1, circuit 15S-LE6 (GN/YE), harness side and ground.
  
  Fig 3: Checking DRL Relay (Early Build)
  Courtesy of FORD MOTOR CO.
- Is any voltage present?
Yes : GO to B4.

No : INSTALL a new DRL relay. TEST the system for normal operation.
B4 CHECK CIRCUIT 15S-LE6 (GN/YE) FOR A SHORT TO VOLTAGE (EARLY BUILD)
- Disconnect: Headlamp Switch C205.
- Measure the voltage between the DRL relay C1000-1, circuit 15S-LE6 (GN/YE), harness side and ground.
  
  Fig 4: Checking Circuit 15S-LE6 (GN/YE) For Short To Voltage (Early Build)
  Courtesy of FORD MOTOR CO.
- Is any voltage present?
Yes : REPAIR the circuit. TEST the system for normal operation.

No : GO to B5.
B5 CHECK CIRCUIT 15-LE29 (GN/BK) FOR A SHORT TO VOLTAGE (EARLY BUILD)
- Measure the voltage between the headlamp switch C205-8, circuit 15-LE29 (GN/BK), harness side and ground.
  
  Fig 5: Checking Circuit 15-LE29 (GN/BK) For Short To Voltage (Early Build)
  Courtesy of FORD MOTOR CO.
- Is any voltage present?
Yes : REPAIR the circuit. TEST the system for normal operation.

No : INSTALL a new headlamp switch. REFER to EXTERIOR LIGHTING . TEST the system for normal operation.
B6 CHECK CIRCUIT 15S-LE8 (GN/RD) FOR A SHORT TO VOLTAGE (LATE BUILD)
- Connect: Low Beam Relay C1049.
- Disconnect: CJB C270b.
- Do the headlamps continue to illuminate?
Yes : REPAIR the circuit. TEST the system for normal operation.

No : INSTALL a new CJB. TEST the system for normal operation.