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Home >> Lincoln >> 2010 >> MKZ FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 928 (Exterior Lighting System) >> Diagnostic Tests >> Turn Signal and Hazard Lamps >> Pinpoint Tests >> Pinpoint Test P: The Hazard Lamps Are Inoperative >> Pinpoint Test P: The Hazard Lamps Are Inoperative

Pinpoint Test P: The Hazard Lamps Are 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. P1 CHECK CIRCUIT 570 (BK/WH) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Hazard Switch C2039
      • Fig 1: Checking Circuit For Open
      GF0025981Courtesy of FORD MOTOR CO.
    • Measure the resistance between the hazard switch C2039-2, circuit 570 (BK/WH), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  P2.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  2. P2 CHECK FOR VOLTAGE TO THE HAZARD SWITCH 
      Fig 2: Checking Circuit For Voltage
      GF0025982Courtesy of FORD MOTOR CO.
    • Measure the voltage between the hazard switch C2039-1, circuit 1689 (RD/WH), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  P4.
    2. NO  : Go to  P3.
  3. P3 CHECK CIRCUIT 1689 (RD/WH) FOR AN OPEN 
    • Disconnect: SJB C2280e
      • Fig 3: Checking Circuit For Open
      GF0025983Courtesy of FORD MOTOR CO.
    • Measure the resistance between the hazard switch C2039-1, circuit 1689 (RD/WH), harness side and the SJB C2280e-5, circuit 1689 (RD/WH), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  P5.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  4. P4 CHECK THE HAZARD SWITCH 
    • Disconnect: SJB C2280e
    • Connect: Hazard Lamp Switch C2039
      • Fig 4: Checking Hazard Switch
      GF0025984Courtesy of FORD MOTOR CO.
    • Measure the resistance between the SJB C2280e-5, circuit 1689 (RD/WH), harness side and ground while pressing and releasing the hazard switch.
    • Is the resistance less than 5 ohms with the hazard switch pressed, and greater than 10,000 ohms with the hazard switch released? 
    1. YES  : Go to  P5.
    2. NO  : INSTALL a new hazard lamp switch. TEST the system for normal operation.
  5. P5 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.
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