Pinpoint Test P: The Hazard Lamps Are Inoperative

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

P1 CHECK CIRCUIT 570 (BK/WH) FOR AN OPEN
- Key in OFF position.
- Disconnect: Hazard Switch C2039.
- Measure the resistance between the hazard switch C2039-2, circuit 570 (BK/WH), harness side and ground.
  
  Fig 1: Checking Circuit 570 (BK/WH) For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes: GO to P2.

No: REPAIR the circuit. TEST the system for normal operation.
P2 CHECK FOR VOLTAGE TO THE HAZARD SWITCH
- Measure the voltage between the hazard switch C2039-1, circuit 1689 (RD/WH), harness side and ground.
  
  Fig 2: Checking For Voltage To Hazard Switch
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
Yes: GO to P4.

No: GO to P3.
P3 CHECK CIRCUIT 1689 (RD/WH) FOR AN OPEN
- Disconnect: SJB C2280e.
- 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.
  
  Fig 3: Checking Circuit 1689 (RD/WH) For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes: GO to P5.

No: REPAIR the circuit. TEST the system for normal operation.
P4 CHECK THE HAZARD SWITCH
- Disconnect: SJB C2280e.
- Connect: Hazard Switch C2039.
- Measure the resistance between the SJB C2280e-5, circuit 1689 (RD/WH), harness side and ground while pressing and releasing the hazard switch.
  
  Fig 4: Checking Hazard Switch
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms with the hazard switch pressed, and greater than 10,000 ohms with the hazard switch released?
Yes: GO to P5.

No: INSTALL a new hazard switch. REFER to STEERING SYSTEM-GENERAL INFORMATION . TEST the system for normal operation.
P5 CHECK FOR CORRECT SJB OPERATION
- Disconnect all the SJB connectors.
- Check for:
  - corrosion
  - 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?
Yes: INSTALL a new SJB. REFER to SMART JUNCTION BOX (SJB) . TEST the system for normal operation.

No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.