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Home >> Mercury >> 2009 >> Mariner Base, 2.5 7, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 31 (Exterior Lighting System) >> Diagnostic Tests >> Headlamps >> Pinpoint Tests >> Pinpoint Test E: One High Beam Headlamp Is Inoperative >> Pinpoint Test E: One High Beam Headlamp Is Inoperative

Pinpoint Test E: One High Beam Headlamp Is Inoperative

WARNING: This page is about a different car, the 2009 Ford Mustang. 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.
NOTE: For halogen headlamps, make sure the bulb is good before continuing diagnostics.
  1. E1 CHECK THE LOW BEAMS 
    • Key in OFF position.
      • NOTE: Make sure the multifunction switch is in the LOW BEAM position.
    • Place the headlamp switch in the HEADLAMPS ON position.
    • Does the low beam illuminate in the headlamp in question? 
    1. YES  : For HID headlamps, go to  E2.

      For halogen headlamps, go to  E3.

    2. NO  : For halogen headlamps, go to Pinpoint Test C .

      For HID headlamps, go to Pinpoint Test D .

  2. E2 CHECK CIRCUIT 1335 (YE/WH) OR CIRCUIT 1337 (VT/YE) FOR VOLTAGE 
    • Disconnect: Inoperative Headlamp
    • Place the headlamp switch in the HEADLAMPS ON position.
    • Place sure the multifunction switch is in the HIGH BEAM position.
      • Fig 1: Checking Circuit 1335 (YE/WH) Or Circuit 1337 (VT/YE) For Voltage
      GF0046540Courtesy of FORD MOTOR CO.
    • Measure the voltage between the LH headlamp C1021-3 or C1284-3, circuit 1337 (VT/YE), harness side and ground; or between the RH headlamp C1041-3 or C1285-3, circuit 1335 (YE/WH), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : REPAIR or INSTALL a new headlamp assembly. REFER to Headlamp Assembly . TEST the system for normal operation.
    2. NO  : Go to  E3.
  3. E3 CHECK CIRCUIT 1335 (YE/WH) OR CIRCUIT 1337 (VT/YE) FOR AN OPEN 
    • Place the headlamp switch in the OFF position.
    • Disconnect: Inoperative Headlamp
    • Disconnect: BEC C1035c
      • Fig 2: Checking Circuit 1335 (YE/WH) Or Circuit 1337 (VT/YE) For Open
      GF0016109Courtesy of FORD MOTOR CO.
    • Measure the resistance between the LH headlamp C1021-3 or C1284-3, circuit 1337 (VT/YE), harness side and the BEC C1035c-F6, circuit 1337 (VT/YE), harness side; or between the RH headlamp C1041-3 or C1285-3, circuit 1335 (YE/WH), harness side and the BEC C1035c-F7, circuit 1335 (YE/WH), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new BEC. TEST the system for normal operation.
    2. NO  : REPAIR the circuit in question. TEST the system for normal operation.
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