Pinpoint Test C: No Power In Run/Start

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

C1 CHECK CIRCUIT 1050 (LG/VT) FOR AN OPEN OR A SHORT TO GROUND
- Key in OFF position.
- Disconnect: SJB C2280a
- Disconnect: Ignition Switch C250
- Measure the resistance between:
  - ignition switch C250-1 circuit 1050 (LG/VT), harness side and SJB C2280a-7 circuit 1050 (LG/VT), harness side.
  - ignition switch C250-1 circuit 1050 (LG/VT), harness side and ground.
- Is the resistance less than 5 ohms between the components, and greater than 10,000 ohms to ground?
1. YES : Go to C2.
2. NO : REPAIR circuit 1050 (LG/VT). CLEAR the DTCs. REPEAT the self-test.
C2 CHECK THE IGNITION SWITCH
- Carry out the Ignition Switch Component Test. Refer to COMPONENT TESTING article.
- Is the ignition switch OK?
1. YES : Go to C3.
2. NO : INSTALL a new ignition switch. REFER to Ignition Switch . CLEAR the DTCs. REPEAT the self-test.
C3 CHECK FOR CORRECT SJB OPERATION
- Disconnect all the SJB connectors.
- Check for:
  - corrosion.
  - pushed-out pins.
  - spread terminals.
- Connect all the SJB connectors and make sure they seat correctly.
- Operate the system and determine if the concern is still present.
- Is the concern still present?
1. YES : INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES article.
2. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.