Pinpoint Test A : No Power In All Ignition Switch Positions - Conventional Ignition Switch
WARNING: This page is about a different car, the 2018 Lincoln Navigator. 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 the Wiring Diagram Information 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 CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, BCM guided routine is not applicable for this vehicle and market. Replace the component that was faulted through service information diagnosis. 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.