F 250 4WD Super Duty V8-5.4L (2009)
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Disconnect: Suspect Ajar Switch .
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Do the courtesy lamps illuminate?
Yes
INSTALL a new ajar switch in question. TEST the system for normal operation.
No
GO to D2.
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D2 CHECK THE AJAR SWITCH CIRCUIT FOR A SHORT TO GROUND
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Disconnect: SJB C2280c.
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Measure the resistance between the suspect ajar switch, harness side and ground as follows:
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Is the resistance greater than 10,000 ohms?
Yes
GO to D3.
No
REPAIR the circuit in question. TEST the system for normal operation.
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D3 CHECK FOR CORRECT SJB OPERATION
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Disconnect all the SJB connectors.
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Check for:
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corrosion
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damaged pins
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pushed-out pins
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Connect all the SJB connectors and make sure they seat correctly.
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Operate the system and verify the concern is still present.
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Is the concern still present?
Yes
INSTALL a new SJB. TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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Pinpoint Test E: The Demand Lamps Are Inoperative
Interior Lighting
Pinpoint Tests
Pinpoint Test E: The Demand Lamps Are Inoperative
