Pinpoint Test A: The Ignition Switch Is Inoperative: Testing

WARNING: This page is about a different car, the 2005 Mercury Montego, 2005 Ford Freestyle, and 2005 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.

A1 CHECK CIRCUIT 1715 (RD) FOR VOLTAGE
- Disconnect: Ignition Switch C250.
- Measure the voltage between the ignition switch C250-4, circuit 1715 (RD), harness side and ground.
  
  Fig 1: Checking Circuit 1715 (RD) For Voltage
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : INSTALL a new ignition switch. REFER to IGNITION SWITCH . TEST the system for normal operation.
- No : GO to A2.
A2 CHECK CIRCUIT 1715 (RD) FOR AN OPEN OR SHORT TO GROUND
- Disconnect: BJB fuse 34 (30A).
- Measure the resistance between the ignition switch C250-4, circuit 1715 (RD), harness side and ground, and between the ignition switch C250-4, circuit 1715 (RD), harness side and BJB fuse 34 (30A), circuit 1715 (RD), output side.
  
  Fig 2: Checking Circuit 1715 (RD) For Open Or Short To Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms between the ignition switch and ground, and less than 5 ohms between the ignition switch and the BJB?
- Yes : INSTALL a new BJB. REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.
- No : REPAIR the circuit. TEST the system for normal operation.