Pinpoint Test A: The Courtesy Lamps Do Not Illuminate With A Door Open

Interior Lighting

Pinpoint Tests

Pinpoint Test A: The Courtesy Lamps Do Not Illuminate With A Door Open

Refer to Wiring Diagram Set 117, Remote Keyless Entry and Alarm for schematic and connector information. Diagrams By Number

Normal Operation

The Smart Junction Box (SJB) sends a voltage signal to each door ajar switch, which is routed to ground when the door is closed (the door ajar switch is closed when the door is closed). When the door is opened, the signal to ground is interrupted, indicating an open door to the SJB. When the SJB determines a door is open, the SJB then provides voltage to the courtesy lamps.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Door ajar switch (part of the door latch)
- SJB


PINPOINT TEST A: THE COURTESY LAMPS DO NOT ILLUMINATE WITH A DOOR OPEN

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 THE OPERATION OF THE COURTESY LAMPS FROM THE DIMMER SWITCH


- Ignition OFF.
- Rotate the instrument panel dimmer switch to the DOME LAMP position.
- Do the courtesy lamps illuminate?

Yes
GO to A2.

No
GO to Pinpoint Test C. Pinpoint Test C: The Interior Courtesy Lamp(s) Are Inoperative

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A2 CHECK THE DOOR AJAR SWITCH OPERATION


- Ignition OFF.
- Disconnect: Suspect Door Ajar Switch.
- Do the courtesy lamps illuminate?

Yes
INSTALL a new door latch for the ajar switch in question. REFER to Handles, Locks, Latches and Entry Systems Front Door Latch or Rear Door Latch. TEST the system for normal operation.

No
GO to A3.

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A3 CHECK THE DOOR AJAR SWITCH CIRCUIT FOR A SHORT TO GROUND


- Disconnect: SJB C2280c.
- Measure the resistance between the suspect door ajar switch, harness side and ground as follows:









- Is the resistance greater than 10,000 ohms?

Yes
GO to A4.

No
REPAIR the circuit in question for a short to ground. TEST the system for normal operation.

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A4 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 Multifunction Electronic Modules Service and Repair. 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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