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Pinpoint Test C: One Low Beam Headlamp Is Inoperative

WARNING: This page is about a different car, the 2005 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
  1. C1 DETERMINE IF THE VEHICLE IS EQUIPPED WITH HID LIGHTING 
    • Check the vehicle for HID headlamps.
    • Is the vehicle equipped with HID headlamps? 
    • Yes  : GO to  C7.
    • No  : GO to  C2.
  2. C2 RETRIEVE THE FEM DIAGNOSTIC TROUBLE CODES (DTCs) 
    NOTE: Make sure the headlamp switch is in the OFF position.
    • Key in OFF position.
    • Connect the diagnostic tool.
    • Key in ON position.
    • Carry out the FEM on-demand self-test.
    • Are any DTCs present? 
  3. C3 CHECK CIRCUIT 31S-LE16 (BK/RD) (LH LOW BEAM) OR CIRCUIT 31S-LE23 (BK/WH) (RH LOW BEAM) FOR SHORT TO POWER 
    • Key in OFF position.
    • Disconnect: FEM C201a.
    • Disconnect: LH Headlamp C1021 or RH Headlamp C1041.
    • Key in ON position.
    • Measure the voltage between FEM C201a-8, circuit 31S-LE16 (BK/RD) (LH headlamp), harness side and ground; or between FEM C201a-7, circuit 31S-LE23 (BK/WH) (RH headlamp), harness side and ground.
      Fig 1: Measuring Voltage Between FEM C201A-8, Circuit 31S-LE16 And Ground; Or Between FEM C201a-7, Circuit 31S-LE23 And Ground
      G03998546Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    • Yes  : REPAIR the circuit in question. TEST the system for normal operation.
    • No  : GO to  C13.
  4. C4 CHECK CIRCUIT 29S-LE16 (OG/GN) (LH LOW BEAM) OR CIRCUIT 29S-LE23 (OG/WH) (RH LOW BEAM) FOR AN OPEN (HALOGEN HEADLAMP) 
    • Key in OFF position.
    • Disconnect: LH Headlamp C1021 or RH Headlamp C1041.
    • Key in ON position.
    • Measure the voltage between LH headlamp C1021-1, circuit 29S-LE16 (OG/GN), harness side and ground; or between RH headlamp C1041-1, circuit 29S-LE23 (OG/WH), harness side and ground.
      Fig 2: Measuring Voltage Between LH Headlamp C1021-1, Circuit 29S-LE16 And Ground; Or Between RH Headlamp C1041-1, Circuit 29S-LE23 And Ground
      G03998547Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to  C5.
    • No  : REPAIR the circuit in question. CLEAR the DTCs. TEST the system for normal operation.
  5. C5 CHECK CIRCUIT 31S-LE16 (BK/RD) (LH LOW BEAM) OR CIRCUIT 31S-LE23 (BK/WH) (RH LOW BEAM) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: FEM C201a.
    • Measure the resistance between FEM C201a-8, circuit 31S-LE16 (BK/RD), harness side and LH headlamp C1021-4, circuit 31S-LE16 (BK/RD), harness side; or between FEM C201a-7, circuit 31S-LE23 (BK/WH), harness side and RH headlamp C1041-4, circuit 31S-LE23 (BK/WH), harness side.
      Fig 3: Measuring Resistance Between FEM C201A-8, Circuit 31S-LE16 (BK/RD), And LH Headlamp C1021-4, Circuit 31S-LE16 (BK/RD)
      G03998548Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to  C6.
    • No  : REPAIR the circuit in question. CLEAR the DTCs. TEST the system for normal operation.
  6. C6 CHECK THE HEADLAMP ASSEMBLY 
    • Connect: LH Headlamp C1021 or RH Headlamp C1041.
    • Connect a fused (10A) jumper wire between FEM C201a-8, circuit 31S-LE16 (BK/RD) (LH headlamp), harness side and ground; or between FEM C201a-7, circuit 31S-LE23 (BK/WH) (RH headlamp), harness side and ground.
      Fig 4: Connecting A Fused (10A) Jumper Wire Between FEM C201a-8, Circuit 31S-LE16 (BK/RD) (LH Headlamp), Harness Side And Ground
      G03998549Courtesy of FORD MOTOR CO.
    • Key in ON position.
    • Does the inoperative low beam now illuminate? 
    • Yes  : GO to  C13.
    • No  : REPAIR or INSTALL a new headlamp assembly. REFER to HEADLAMP ASSEMBLY  in this article. TEST the system for normal operation.
  7. C7 CHECK CIRCUIT 91S-LE16 (BN/YE) (LH LOW BEAM) OR CIRCUIT 91S-LE23 (BN/WH) (RH LOW BEAM) FOR A SHORT TO POWER 
    • Key in OFF position.
    • Disconnect: FEM C201b or C201f.
    • Disconnect: LH HID Relay C1379 or RH HID Relay C1380.
    • Key in ON position.
    • Measure the voltage between FEM C201b-6, circuit 91S-LE16 (BN/YE) (LH headlamp), harness side and ground; or between FEM C201N20, circuit 91S-LE23 (BN/WH) (RH headlamp), harness side and ground.
      Fig 5: Measuring Voltage Between FEM C201B-6, Circuit 91S-LE16 (BN/YE) (LH Headlamp) And Ground; Or Between FEM C201N20, Circuit 91S-LE23 (BN/WH) (RH Headlamp), Harness Side And Ground
      G03998550Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    • Yes  : REPAIR the circuit in question. TEST the system for normal operation.
    • No  : GO to  C8.
  8. C8 CHECK CIRCUIT 91S-LE16 (BN/YE) (LH LOW BEAM) OR CIRCUIT 91S-LE23 (BN/WH) (RH LOW BEAM) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between FEM C201b-6, circuit 91S-LE16 (BN/YE), harness side and LH HID relay C1379-2, circuit 91S-LE16 (BN/YE), harness side; or between FEM C201f-20, circuit 91S-LE23 (BN/WH), harness side and RH HID relay C1380-2, circuit 91S-LE23 (BN/WH), harness side.
      Fig 6: Measuring Resistance Between FEM C201B-6, Harness Side And LH Hid Relay C1379-2, Circuit 91S-LE16 (BN/YE)
      G03998551Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to  C9.
    • No  : REPAIR the circuit in question. TEST the system for normal operation.
  9. C9 CHECK CIRCUIT 29S-LE16 (OG/GN) (LH LOW BEAM) OR CIRCUIT 29S-LE23 (OG/WH) (RH LOW BEAM) FOR AN OPEN (HID HEADLAMP) 
    • Key in ON position.
    • Measure the voltage between LH HID relay C1379-1, circuit 29S-LE16 (OG/GN), harness side and ground; or between RH HID relay C1380-1, circuit 29S-LE23 (OG/WH), harness side and ground.
      Fig 7: Measuring The Voltage Between LH HID Relay C1379-1, Circuit 29S-LE16 And Ground; Or Between RH HID Relay C1380-1, Circuit 29S-LE23 And Ground
      G03890493Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to  C10.
    • No  : REPAIR the circuit in question. TEST the system for normal operation.
  10. C10 CHECK THE HID RELAY 
    • Carry out the HID relay component test. Refer to COMPONENT TESTING for component testing.
    • Is the HID relay OK? 
    • Yes  : GO to  C11.
    • No  : INSTALL a new HID relay. TEST the system for normal operation.
  11. C11 CHECK CIRCUIT 30-LE31 (RD/YE) (LH LOW BEAM) OR CIRCUIT 30-LE30 (RD/BU) (RH LOW BEAM) FOR AN OPEN (HID HEADLAMP) 
    • Key in OFF position.
    • Measure the voltage between LH HID relay C1379-3, circuit 30-LE31 (RD/YE), harness side and ground; or between RH HID relay C1380-3, circuit 30-LE30 (RD/BU), harness side and ground.
      Fig 8: Measuring Voltage Between LH HID Relay C1379-3, Circuit 30-LE31 And Ground; Or Between RH HID Relay C1380-3, Circuit 30-LE30 And Ground
      G03890480Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : REPAIR the circuit in question. TEST the system for normal operation.
    • No  : GO to  C12.
  12. C12 CHECK THE FEM 
    • Connect: LH HID Relay C1379 or RH HID Relay C1380.
    • Connect a fused (10A) jumper wire between FEM C201b-6, circuit 91S-LE16 (BN/YE) (LH headlamp), harness side and ground; or between FEM C201N20, circuit 91S-LE23 (BN/WH) (RH headlamp), harness side and ground.
      Fig 9: Connecting Fused (10A) Jumper Wire Between FEM C201b-6, Circuit 91S-LE16 And Ground; Or Between FEM C201N20, Circuit 91S-LE23 And Ground
      G03998554Courtesy of FORD MOTOR CO.
    • Key in ON position.
    • Does the inoperative low beam now illuminate? 
    • Yes  : REMOVE the jumper wire. GO to  C13.
    • No  : REMOVE the jumper wire. GO to  C14.
  13. C13 CHECK FEM OPERATION 
    • Key in OFF position.
    • Disconnect all FEM connectors.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect all FEM connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes  : INSTALL a new FEM. REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.
    • No  : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
  14. C14 CHECK CIRCUIT 30S-LE16 (RD/BK) (LH LOW BEAM) OR CIRCUIT 30S-LE23 (RD/WH) (RH LOW BEAM) FOR AN OPEN 
    • Key in OFF position.
    • Connect: FEM C201a.
    • Disconnect: LH Headlamp C1021 or RH Headlamp C1041.
    • Place the headlamp switch in the headlamps ON position.
    • Measure the voltage between LH headlamp C1021-1, circuit 30S-LE16 (RD/BK), harness side and ground; or between RH headlamp C1041-1, circuit 30S-LE23 (RD/WH), harness side and ground.
      Fig 10: Measuring Voltage Between LH Headlamp C1021-1, Circuit 30S-LE16 And Ground; Or Between RH Headlamp C1041-1, Circuit 30S-LE23 And Ground
      G03998547Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : TURN the headlamp switch OFF. GO to  C15.
    • No  : REPAIR the circuit in question. TEST the system for normal operation.
  15. C15 CHECK CIRCUIT 31-LE16 (BK/RD) (LH LOW BEAM) OR CIRCUIT 31-LE23 (BK/WH) (RH LOW BEAM) FOR AN OPEN 
    • Measure the resistance between LH headlamp C1021-4, circuit 31-LE16 (BK/RD), harness side and ground; or between RH headlamp C1041-4, circuit 31-LE23 (BK/WH), harness side and ground.
      Fig 11: Measuring Resistance Between LH Headlamp C1021-4, Circuit 31-LE16 And Ground; Or Between RH headlamp C1041-4, Circuit 31-LE23 And Ground
      G03998556Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : INSTALL a new ballast. REFER to HEADLAMP ASSEMBLY  in this article. TEST the system for normal operation.
    • No  : REPAIR the circuit in question. TEST the system for normal operation.
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