F 350 2WD Super Duty V10-6.8L (2009)
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Measure the voltage between the suspect interior lamp pins, harness side as follows:
-
Is the voltage greater than 10 volts?
Yes
INSTALL a new interior lamp for the lamp in question. REFER to Interior Lamp See: Dome Lamp/Service and Repair. TEST the system for normal
operation.
No
GO to B2.
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B2 CHECK CIRCUIT CLN03 (YE/GY) FOR VOLTAGE
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Measure the voltage between the suspect interior lamp, harness side and ground as follows:
-
Is the voltage greater than 10 volts?
Yes
REPAIR circuit GD179 (BK/VT) for an open. TEST the system for normal operation.
No
REPAIR circuit CLN03 (YE/GY) for an open. TEST the system for normal operation.
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Pinpoint Test C: The Courtesy Lamps Stay On Continuously
Interior Lighting
Pinpoint Tests
Pinpoint Test C: The Courtesy Lamps Stay On Continuously
Refer to Wiring Diagram Set 89, Interior Lamps for schematic and connector information. See: Diagrams/Electrical Diagrams/Diagrams By Number
Refer to Wiring Diagram Set 117, Remote Keyless Entry and Alarm for schematic and connector information. See: Diagrams/Electrical
Diagrams/Diagrams By Number
Normal Operation
When any door is opened, the ajar switch opens the circuit to the Smart Junction Box (SJB). The SJB monitors the ajar circuits, and based on the ajar
status, the SJB supplies voltage to the courtesy lamps on circuits CLN03 (YE/GY) (interior), CLN26 (BU) (cargo) and CLN25 (VT) (running boards).
