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Pinpoint Test F: The Headlamps Are On Continuously

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. F1 VERIFY THE HEADLAMP OPERATION 
    • Key in OFF position.
    • Make sure the multifunction switch is in the LOW BEAM and OFF position.
    • Are the low beam headlamps illuminated? 
    1. YES  : If equipped with autolamps, go to  F2 .

      If not equipped with autolamps, go to  F3 .

    2. NO  : Go to  F6.
  2. F2 CHECK THE AUTOLAMP SYSTEM 
    • Observe the parking lamps.
    • Are the parking lamps illuminated with the headlamps? 
    1. YES  : REFER to Autolamps  to diagnose the autolamp system.
    2. NO  : Go to  F3.
  3. F3 CHECK THE MULTIFUNCTION SWITCH (LOW BEAM) 
    • Disconnect: Multifunction Switch C2080
    • Do the headlamps continue to illuminate? 
    1. YES  : Go to  F4.
    2. NO  : INSTALL a new multifunction switch. REFER to STEERING COLUMN SWITCHES article. CLEAR the DTCs. REPEAT the self-test.
  4. F4 CHECK CIRCUITS 160 (DB/WH) AND 161 (DG/OG) FOR A SHORT TO VOLTAGE 
    • Disconnect: SJB C2280b
    • Does the LH or RH headlamp continue to illuminate? 
    1. YES  : REPAIR circuit 160 (DB/WH) (LH headlamp) or circuit 161 (DG/OG) (RH headlamp) as necessary. CLEAR the DTCs. REPEAT the self-test.
    2. NO  : Go to  F5.
  5. F5 CHECK CIRCUIT 1033 (RD/YE) FOR A SHORT TO GROUND 
    • Disconnect: SJB C2280e
      • Fig 1: Checking Circuit For Short To Ground
      GF0025958Courtesy of FORD MOTOR CO.
    • Measure the resistance between the multifunction switch C2080-13, circuit 1033 (RD/YE), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  F9.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  6. F6 CHECK THE MULTIFUNCTION SWITCH (HIGH BEAM) 
    • Disconnect: Multifunction Switch C2080
    • Do the headlamps continue to illuminate? 
    1. YES  : Go to  F7.
    2. NO  : INSTALL a new multifunction switch. REFER to STEERING COLUMN SWITCHES article. CLEAR the DTCs. REPEAT the self-test.
  7. F7 CHECK CIRCUITS 1724 (WH/LG) AND 1779 (DB/LG) FOR A SHORT TO VOLTAGE 
    • Disconnect: SJB C2280b
    • Does the LH or RH headlamp continue to illuminate? 
    1. YES  : REPAIR circuit 1724 (WH/LG) (LH headlamp) or circuit 1779 (DB/LG) (RH headlamp) as necessary. CLEAR the DTCs. REPEAT the self-test.
    2. NO  : Go to  F8.
  8. F8 CHECK CIRCUITS 12 (LG/BK) AND 196 (DB/OG) FOR A SHORT TO GROUND 
    • Disconnect: SJB C2280e
      • Fig 2: Checking Circuits For Short To Ground
      GF0025959Courtesy of FORD MOTOR CO.
    • Measure the resistance between the multifunction switch C2080-2, circuit 12 (LG/BK), harness side and ground; and between the multifunction switch C2080-1, circuit 196 (DB/OG), harness side and ground.
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  F9.
    2. NO  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
  9. F9 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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