Pinpoint Test I: All The Demand Lamps Are Inoperative
Interior Lighting
Pinpoint Tests
Pinpoint Test I: All The Demand Lamps Are Inoperative
Refer to Wiring Diagram Set 89, Interior Lamps for schematic and connector information. Diagrams By Number
Normal Operation
The Smart Junction Box (SJB) energizes the battery saver relay based on inputs from the ignition key position, the door and liftgate ajar switches, the Remote Keyless Entry (RKE) transmitter, the keyless entry keypad, and the instrument panel dimmer switch. When the battery saver relay is energized, voltage is supplied to the demand lamps. The demand lamps share the ground with the courtesy lamps.
NOTE: Make sure the correct lighting subsystem is being diagnosed. The interior courtesy lamp subsystem can set DTCs when a fault exists. The interior courtesy lamps can be identified by placing the instrument panel dimmer switch in the DOME LAMP position. If the interior courtesy lamps do not illuminate, GO to Pinpoint Test C. The demand lamp subsystem is supplied voltage from the battery saver relay. This subsystem does not set a DTC if a fault exists. Demand lamps are identified as lamps that can be illuminated by a switch within the lamp (map lamps and vanity mirror lamps for example). Pinpoint Test C: The Courtesy Lamps Do Not Illuminate From The Instrument Panel Dimmer Switch
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- SJB
PINPOINT TEST I: ALL THE DEMAND LAMPS ARE 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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I1 CHECK THE OPERATION OF ALL THE DEMAND LAMPS
- Ignition OFF.
- Operate and observe each demand lamp.
- Are all the demand lamps inoperative?
Yes
VERIFY the SJB fuse 25 (10A) is OK. If OK, GO to I2. If not OK, Refer to the Wiring Diagrams to identify the possible causes of the circuit short. Diagrams By Number
No
GO to Pinpoint Test J. Pinpoint Test J: An Individual Demand Lamp Is Inoperative
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I2 CHECK THE OPERATION OF THE INTERIOR COURTESY LAMPS
- Rotate the instrument panel dimmer switch to the DOME LAMP position and observe the interior courtesy lamps.
- Do the interior courtesy lamps illuminate?
Yes
GO to I3.
No
REPAIR circuit GD133 (BK) for an open. TEST the system for normal operation.
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I3 BYPASS THE SJB
- Ignition OFF.
- Disconnect: SJB C2280d.
- Connect a fused jumper wire between the SJB C2280d-21, circuit CLN09 (YE/GN), harness side and battery positive.
- Switch a demand lamp on.
- Does the demand lamp illuminate when switched on?
Yes
REMOVE the jumper wire. GO to I4.
No
REMOVE the jumper wire. REPAIR circuit CLN09 (YE/GN) for an open. TEST the system for normal operation.
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I4 CHECK FOR CORRECT SJB OPERATION
- Disconnect all the SJB connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the SJB connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new SJB. REFER to Body Control Systems. 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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