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Home >> Mercury >> 2008 >> Milan Base, 2.3 Z, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 1374 (Steering Column Switches) >> Diagnostic Tests >> Steering Column Switches >> Pinpoint Tests >> Pinpoint Test A: No Power in All Ignition Switch Positions >> Pinpoint Test A: No Power In All Ignition Switch Positions

Pinpoint Test A: No Power In All Ignition Switch Positions

WARNING: This page is about a different car, the 2009 Mercury Milan, 2009 Lincoln MKZ, and 2009 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.
  1. A1 CHECK FOR VOLTAGE AT THE IGNITION SWITCH 
    • Disconnect: Ignition Switch C250
      • Fig 1: Checking Circuit SBB14 (BN/RD) For Voltage
      GF0030228Courtesy of FORD MOTOR CO.
    • Measure the voltage between ignition switch C250-4, circuit SBB14 (BN/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 that BJB fuse 14 (15A) is OK. If OK, go to  A2 .

      If the fuse is not OK, REPAIR the BJB or circuit SBB14 (BN/RD) as necessary. INSTALL a new fuse. TEST the system for normal operation.

  2. A2 CHECK CIRCUIT SBB14 (BN/RD) FOR AN OPEN 
    • Disconnect: BJB Fuse 14 (15A)
      • Fig 2: Checking Circuit SBB14 (BN/RD) For Open
      GF0030229Courtesy of FORD MOTOR CO.
    • Measure the resistance between ignition switch C250-4, circuit SBB14 (BN/RD), harness side and BJB fuse 14 (15A), circuit SBB14 (BN/RD), output side.
    • Is the resistance less than 5 ohms? 
    1. YES  : REPAIR or INSTALL a new BJB. TEST the system for normal operation.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
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