Pinpoint Test A: No Power In All Ignition Switch Positions

WARNING: This page is about a different car, the 2007 Lincoln MKX and 2007 Ford Edge. 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 multi-meter probes.

NOTE: Verify that battery voltage is 10 volts or greater.

A1 CHECK FOR VOLTAGE AT SJB FUSE 27 (20A)
- Key in OFF position.
- Disconnect: SJB Fuse 27 (20A)
- Measure the voltage between SJB fuse 27 (20A), input side and ground.
- Is the voltage greater than 10 volts?
1. YES : Go to A2.
2. NO : Go to A3.
A2 CHECK FOR VOLTAGE ON CIRCUIT SBP27 (BU/RD)
- Connect: SJB Fuse 27 (20A)
- Disconnect: Ignition Switch C250
- Measure the voltage between ignition switch C250-4, circuit SBP27 (BU/RD), harness side and ground.
- Is the voltage greater than 10 volts?
1. YES : INSTALL a new ignition switch. REFER to Ignition Switch . TEST the system for normal operation.
2. NO : VERIFY SJB fuse 27 (20A) is OK. If OK, REPAIR circuit SBP27 (BU/RD). TEST the system for normal operation.
A3 CHECK FOR CORRECT SJB OPERATION
- Disconnect: SJB C2280a
- Disconnect: SJB C2280b
- Check the SJB connectors for:
  - corrosion.
  - pushed-out pins.
  - spread terminals.
- Connect: SJB C2280a
- Connect: SJB C2280b
- Make sure the connectors seat correctly, then operate the system and verify the concern is still present.
- Is the concern still present?
1. YES : INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.
2. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.