Pinpoint Test A: The Ignition Switch Is Inoperative
WARNING: This page is about a different car, the 2006 Mercury Montego, 2006 Ford Freestyle, and 2006 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multimeter probes.
- A1 CHECK CIRCUIT 1715 (RD) FOR VOLTAGE
- Disconnect: Ignition Switch C250.
- Measure the voltage between ignition switch C250-4, circuit 1715 (RD), harness side and ground.
- 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
- Disconnect: BJB fuse 34 (30A).
- Measure the resistance between ignition switch C250-4, circuit 1715 (RD), harness side and BJB fuse 33 (30A), circuit 1715 (RD), output side.
- Is the resistance less than 5 ohms?
Yes: GO to A3.
No: VERIFY BJB fuse 33 (30A) is OK. If OK, REPAIR circuit 1715 (RD) for an open. TEST the system for normal operation.
- A3 CHECK CIRCUIT 1715 (RD) FOR A SHORT TO GROUND
- Disconnect: BJB fuse 33 (30A).
- Measure the resistance between ignition switch C250-4, circuit 1715 (RD), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes: INSTALL a new BJB. REFER to REMOVAL AND INSTALLATION . TEST the system for normal operation.
No: REPAIR circuit 1715 (RD) for a short to ground. TEST the system for normal operation.