Ranger 4WD V6-4.0L (2009)
Courtesy Lamp: Pinpoint Tests
Pinpoint Test A: The Interior Lamp Is Inoperative
Interior Lighting
Pinpoint Tests
Pinpoint Test A: The Interior 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
Voltage is supplied to the Smart Junction Box (SJB) through circuit SBB05 (GY/RD). The SJB fuse 13 (15A) supplies voltage to the interior lamp relay
(internal to the SJB). When any door is opened, the door ajar switch closes, signaling the SJB. The SJB monitors the door ajar circuits, and the
instrument panel dimmer switch input. Based on these inputs, the SJB supplies voltage to the interior lamp on circuit CLN28 (GN/BU).
This pinpoint test is intended to diagnose the following:
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Fuse
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Wiring, terminals or connectors
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Interior lamp
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SJB
PINPOINT TEST A: THE INTERIOR 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.
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A1 CHECK CIRCUIT CLN28 (GN/BU) FOR VOLTAGE
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Ignition ON.
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Disconnect: Interior Lamp C931.
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Open one of the doors.
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Measure the voltage between the interior lamp C931-1, circuit CLN28 (GN/BU), harness side and ground.
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Is the voltage greater than 10 volts?
Yes
INSTALL a new interior lamp. TEST the system for normal operation.
No
VERIFY the SJB fuse 13 (15A) is OK. If OK, GO to A2. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short.
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A2 CHECK CIRCUIT CLN28 (GN/BU) FOR AN OPEN
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Ignition OFF.
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Disconnect: SJB C2280c.
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Measure the resistance between the SJB C2280c-8, circuit CLN28 (GN/BU), harness side and the interior lamp C931-1, circuit CLN28 (GN/BU),
harness side.