F 550 4WD Super Duty V10-6.8L (2009)
Pinpoint Test F: An Individual Demand Lamp Is Inoperative
Interior Lighting
Pinpoint Tests
Pinpoint Test F: An Individual Demand Lamp Is Inoperative
Refer to Wiring Diagram Set 89, Interior Lamps for schematic and connector information. See: Diagrams/Electrical Diagrams/Diagrams By Number
Normal Operation
The Smart Junction Box (SJB) supplies voltage to the demand lamps on circuit CLN09 (YE/GN). The demand lamps are grounded through circuit
GD115 (BK/GY), GD122 (BK) or GD179 (BK/VT).
This pinpoint test is intended to diagnose the following:
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Wiring, terminals, or connectors
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Interior lamp
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Vanity lamp (if equipped)
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Underhood lamp (if equipped)
PINPOINT TEST F: AN INDIVIDUAL DEMAND LAMP IS INOPERATIVE
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the
connector.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings.
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F1 CHECK CIRCUIT CLN09 (YE/GN) FOR AN OPEN
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Ignition OFF.
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Disconnect: Suspect Demand Lamp .
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Ignition ON.
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Measure the voltage between the suspect demand lamp, harness side and ground as follows:
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Is the voltage greater than 10 volts?
Yes
GO to F2.
No
REPAIR the circuit in question. TEST the system for normal operation.
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F2 CHECK THE GROUND CIRCUIT FOR AN OPEN
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Disconnect: Negative Battery Cable.
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Measure the resistance between the suspect demand lamp, harness side and ground as follows:
