Pinpoint Test C: No Power In RUN
Steering Column Switches
Pinpoint Test C: No Power in RUN
Refer to Wiring Diagram Set 13 (Fusion/Milan/MKZ, Fusion Hybrid, Milan Hybrid, MKZ Hybrid), Power Distribution/SJB for schematic and connector information. Diagrams By Number
Normal Operation
When the ignition switch is placed in the RUN position, fused ignition voltage is sent to the Smart Junction Box (SJB) along circuit CDC34 (WH/OG).
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Ignition switch
- SJB
PINPOINT TEST C: NO POWER IN RUN
NOTICE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multimeter probes.
NOTE: Verify that battery voltage is greater than 10 volts.
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C1 CHECK FOR VOLTAGE ON THE IGNITION RUN CIRCUIT
- Ignition OFF.
- Disconnect: SJB Fuse 42 (10A) (if equipped).
- Ignition ON.
- Measure the voltage between SJB fuse 42 (10A), circuit CDC34 (WH/OG), input side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to C2.
No
GO to C4.
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C2 CHECK FOR VOLTAGE AT THE SJB
- Ignition OFF.
- Disconnect: SJB C2280B.
- Ignition ON.
- Measure the voltage between SJB C2280B-45, circuit CDC34 (WH/OG), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to C3.
No
GO to C5.
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C3 CHECK THE SJB IGNITION SWITCH INPUT CIRCUIT FOR VOLTAGE
- Ignition OFF.
- Disconnect: SJB C2280E.
- Ignition ON.
- Measure the voltage between SJB C2280E-1, circuit CDC34 (WH/OG), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to C10.
No
GO to C6.
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C4 CHECK THE SJB IGNITION SWITCH INPUT CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: SJB C2280A.
- Disconnect: Ignition Switch C250.
- Measure the resistance between ignition switch C250-1, circuit CDC34 (WH/OG), harness side and SJB C2280A-4, circuit CDC34 (WH/OG), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to C7.
No
REPAIR circuit CDC34 (WH/OG). TEST the system for normal operation.
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C5 CHECK THE IGNITION RUN CIRCUIT FOR AN OPEN
- Disconnect: Ignition Switch C250.
- Measure the resistance between ignition switch C250-1, circuit CDC34 (WH/OG), harness side and SJB C2280B-45, circuit CDC34 (WH/OG), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to C9.
No
REPAIR circuit CDC34 (WH/OG). TEST the system for normal operation.
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C6 CHECK THE IGNITION SWITCH OUTPUT CIRCUIT FOR AN OPEN
- Disconnect: Ignition Switch C250.
- Measure the resistance between ignition switch C250-1, circuit CDC34 (WH/OG), harness side and SJB C2280E-1, circuit CDC34 (WH/OG), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to C9.
No
REPAIR circuit CDC34 (WH/OG). TEST the system for normal operation.
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C7 CHECK THE IGNITION RUN CIRCUIT FOR A SHORT TO GROUND
- Disconnect: SJB C2280B.
- Disconnect: SJB C2280E.
- Measure the resistance between ignition switch C250-1, circuit CDC34 (WH/OG), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to C8.
No
REPAIR circuit CDC34 (WH/OG). TEST the system for normal operation.
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C8 CHECK THE IGNITION SWITCH
- Carry out the Ignition Switch component test.
- Did the ignition switch pass the component test?
Yes
GO to C10.
No
INSTALL a new ignition switch. REFER to Ignition Switch Ignition Switch. TEST the system for normal operation.
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C9 CHECK FOR CORRECT IGNITION SWITCH OPERATION
- Carry out the Ignition Switch component test.
- Did the ignition switch pass the component test?
Yes
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
No
INSTALL a new ignition switch. REFER to Ignition Switch Ignition Switch. TEST the system for normal operation.
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C10 CHECK FOR CORRECT SJB OPERATION
- Disconnect: All SJB connectors.
- Check the SJB connectors for:
- corrosion.
- pushed-out pins.
- spread terminals.
- Connect: All SJB connectors and make sure the connectors are seated correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new SJB. REFER to Multifunction Electronic Modules Service and Repair. TEST the system for normal operation.
No
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.
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