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Home >> Mercury >> 2009 >> Mariner Base, 2.5 7, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 32 (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 Ford Mustang. 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 THE VOLTAGE AT THE IGNITION SWITCH 
    • Key in OFF position.
    • Disconnect: Ignition Switch C250
      • Fig 1: Checking Voltage At Ignition Switch
      GF0015978Courtesy of FORD MOTOR CO.
    • Measure the voltage between ignition switch C250-4, circuit 1050 (LG/VT), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  A3.
    2. NO  : VERIFY BEC fuse 68 (20A) is OK. If not OK, refer to the appropriate SYSTEM WIRING DIAGRAMS to identify the possible causes of the circuit short. If OK, go to  A2.
  2. A2 CHECK CIRCUIT 1050 (LG/VT) FOR AN OPEN OR A SHORT TO GROUND 
    • Disconnect: BEC Fuse 68 (20A)
      • Fig 2: Checking Circuit 1050 (LG/VT) For An Open Or Short To Ground
      GF0015979Courtesy of FORD MOTOR CO.
    • Measure the resistance between:
      • ignition switch C250-4, circuit 1050 (LG/VT), harness side and BEC fuse 68 (20A), circuit 1050 (LG/VT), output side.
      • ignition switch C250-4, circuit 1050 (LG/VT), harness side and ground.
    • Are the resistances less than 5 ohms between the ignition switch and the BEC, and greater than 10,000 ohms between the ignition switch and ground? 
    1. YES  : REPAIR or INSTALL a new BEC as necessary. TEST the system for normal operation.
    2. NO  : REPAIR circuit 1050 (LG/VT). TEST the system for normal operation.
  3. A3 CHECK THE IGNITION SWITCH 
    • Carry out the Ignition Switch Component Test. Refer to COMPONENT TESTING.
    • Is the ignition switch OK? 
    1. YES  : Go to  A4.
    2. NO  : INSTALL a new ignition switch. REFER to Ignition Switch . TEST the system for normal operation.
  4. A4 CHECK CIRCUIT 1002 (PK/BK) FOR AN OPEN 
    • Disconnect: SJB C2280a
      • Fig 3: Measuring Resistance Between Ignition Switch C250-6, Circuit 1002 (PK/BK)
      GF0015980Courtesy of FORD MOTOR CO.
    • Measure the resistance between ignition switch C250-6, circuit 1002 (PK/BK), harness side and SJB C2280a-11, circuit 1002 (PK/BK), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  A5.
    2. NO  : VERIFY SJB fuses 20 (10A) and 21 (10A) are OK. If OK, REPAIR circuit 1002 (PK/BK). If not OK, refer to the appropriate SYSTEM WIRING DIAGRAMS to identify the possible causes of the circuit short. TEST the system for normal operation.
  5. A5 CHECK CIRCUIT 1044 (WH/YE) FOR AN OPEN 
      Fig 4: Measuring Resistance Between Ignition Switch C250-1, Circuit 1044 (WH/YE)
      GF0015981Courtesy of FORD MOTOR CO.
    • Measure the resistance between ignition switch C250-1, circuit 1044 (WH/YE), harness side and SJB C2280a-36, circuit 1044 (WH/YE), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  A6.
    2. NO  : VERIFY SJB fuses 20 (10A) and 21 (10A) are OK. If OK, REPAIR circuit 1002 (PK/BK). If not OK, refer to the appropriate SYSTEM WIRING DIAGRAMS to identify the possible causes of the circuit short. TEST the system for normal operation.
  6. A6 CHECK CIRCUIT 1522 (DG) FOR AN OPEN 
      Fig 5: Measuring Resistance Between Ignition Switch C250-7, Circuit 1522 (DG)
      GF0015982Courtesy of FORD MOTOR CO.
    • Measure the resistance between ignition switch C250-7, circuit 1522 (DG), harness side and SJB C2280a-12, circuit 1522 (DG), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  A7.
    2. NO  : VERIFY SJB fuses 20 (10A) and 21 (10A) are OK. If OK, REPAIR circuit 1002 (PK/BK). If not OK, refer to the appropriate SYSTEM WIRING DIAGRAMS to identify the possible causes of the circuit short. TEST the system for normal operation.
  7. A7 CHECK FOR CORRECT SJB OPERATION 
    • Check SJB C2280a for:
      • corrosion.
      • pushed-out pins.
      • spread terminals.
    • Connect: SJB C2280a
    • Make sure the connector seats 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 article. REPEAT the self-test.
    2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. TEST the system for normal operation.
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