E 450 V8-5.4L (2009)
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Ignition OFF.
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Disconnect: Instrument Panel Dimmer Switch C2065.
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Connect a fused jumper wire between the instrument panel dimmer switch C2065-2, circuit CLN28 (GN/BU), harness side and the instrument
panel dimmer switch C2065-4, circuit RLN29 (WH/OG), harness side.
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Do the courtesy lamps illuminate?
Yes
REMOVE the jumper wire. INSTALL a new instrument panel dimmer switch. TEST the system for normal operation.
No
REMOVE the jumper wire. GO to B5.
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B5 CHECK THE DOME LAMP REQUEST INPUT CIRCUIT FOR AN OPEN
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Disconnect: SJB C2280b.
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Measure the resistance between the SJB C2280b-51, circuit CLN28 (GN/BU), harness side and the instrument panel dimmer switch C2065-2,
circuit CLN28 (GN/BU), harness side.
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Is the resistance less than 5 ohms?
Yes
GO to B6.
No
REPAIR the circuit. TEST the system for normal operation.
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B6 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