Pinpoint Test A : No Power In All Ignition Switch Positions - Conventional Ignition Switch
WARNING: This page is about a different car, the 2019 Ford F-550 Super Duty, 2019 Ford F-450 Super Duty, 2019 Ford F-350 Super Duty, and 2019 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
- A1 CHECK THE VEHICLE BATTERY
- Carry out the Battery Condition Test. REFER to: Battery .
Is the battery OK?
Yes GO to A2 No CORRECT the battery condition. - A2 CHECK FOR VOLTAGE TO THE IGNITION SWITCH
- Ignition OFF.
- Disconnect Ignition Switch C250.
- Measure:
Positive Lead Measurement / Action Negative Lead C250-4 Ground
Is the voltage greater than 11 volts?
Yes INSTALL a new ignition switch. REFER to: Ignition Switch . No VERIFY the BCM fuse 18 (5A) is OK. If OK, GO to A3
If not OK, REFER to OEM Wiring Diagrams to identify the possible cause of the circuit short. - A3 CHECK THE IGNITION SWITCH VOLTAGE SUPPLY CIRCUIT FOR AN OPEN
- Disconnect BCM C2280A.
Is the resistance less than 3 ohms?
Yes GO to A4 No REPAIR the circuit. - A4 CHECK FOR CORRECT BCM (BODY CONTROL MODULE) OPERATION
- Disconnect and inspect all BCM connectors.
- Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
- Reconnect the BCM connectors and all other previously disconnected connectors. Make sure they seat and latch correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes Refer to BCM Guided Routine . No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.