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Home >> Ford >> 2002 >> Taurus LX, 3.0 S >> Repair and Diagnosis >> External Pages >> Different car >> Section 2304 (Exterior Lighting System) >> Diagnostic Tests >> Headlamps >> Pinpoint Tests >> Pinpoint Test D: One Low Beam Headlamp Is Inoperative >> Pinpoint Test D: One Low Beam Headlamp Is Inoperative

Pinpoint Test D: One Low Beam Headlamp Is Inoperative

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. D1 CHECK CIRCUIT 57 (BK) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Inoperative Headlamp
    • Measure the resistance between the inoperative headlamp, harness side and ground as follows:
      Inoperative Headlamp Connector-Pin (Escape) Connector-Pin (Mariner) Circuit
      LH C1021-4 C1284-2 57 (BK)
      RH C1041-4 C1285-2 57 (BK)
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  D2.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  2. D2 CHECK CIRCUIT 160 (DB/WH) (LH HEADLAMP) OR CIRCUIT 161 (DG/OG) (RH HEADLAMP) FOR VOLTAGE 
    • Key in ON position.
    • Place the multifunction switch in the HEADLAMPS ON position.
    • Measure the voltage between the inoperative headlamp, harness side and ground as follows:
      Inoperative Headlamp Connector-Pin (Escape) Connector-Pin (Mariner) Circuit
      LH C1021-7 C1284-1 160 (DB/WH)
      RH C1041-7 C1285-1 161 (DG/OG)
    • Is the voltage greater than 10 volts? 
    1. YES  : REPAIR or INSTALL a new headlamp assembly. REFER to Headlamp Assembly . CLEAR the DTCs. REPEAT the self-test.
    2. NO  : Go to  D3.
  3. D3 CHECK CIRCUIT 160 (DB/WH) (LH HEADLAMP) OR CIRCUIT 161 (DG/OG) (RH HEADLAMP) FOR AN OPEN 
    • Key in OFF position.
    • Place the multifunction switch in the OFF position.
    • Disconnect: SJB C2280b
    • Measure the resistance between the inoperative headlamp, harness side and the SJB, harness side as follows:
      Inoperative Headlamp Connector- Pin (Escape) Connector- Pin (Mariner) SJB Connector- Pin Circuit
      LH C1021-7 C1284-1 C2280b-22 160 (DB/WH)
      RH C1041-7 C1285-1 C2280b-26 161 (DG/OG)
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  D4.
    2. NO  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
  4. D4 CHECK CIRCUIT 160 (DB/WH) (LH HEADLAMP) OR CIRCUIT 161 (DG/OG) (RH HEADLAMP) FOR A SHORT TO GROUND 
    • Measure the resistance between the inoperative headlamp, harness side and ground as follows:
      Inoperative Headlamp Connector-Pin (Escape) Connector-Pin (Mariner) Circuit
      LH C1021-7 C1284-1 160 (DB/WH)
      RH C1041-7 C1285-1 161 (DG/OG)
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  D5.
    2. NO  : REPAIR the circuit in question. RUN the on-demand self-test (required to clear certain DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.
  5. D5 CHECK FOR CORRECT SJB OPERATION 
    • Disconnect all the SJB connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the SJB connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES article. TEST the system for normal operation.
    2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
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