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 110 (Fusion/Milan/MKZ, Fusion Hybrid/Milan Hybrid), Power Door Locks for schematic and connector information. Diagrams By Number

Refer to Wiring Diagram Set 113 (Fusion/Milan/MKZ, Fusion Hybrid/Milan Hybrid), Luggage Compartment Lid Release for schematic and connector information. Diagrams By Number

Normal Operation

When any door is open, the ajar switch opens the circuit to the Smart Junction Box (SJB). The SJB monitors the ajar circuits, and based on the ajar status, the SJB supplies voltage to the courtesy lamps.

When any door is opened, a correct unlock code from the keyless entry keypad or an unlock request from a programmed Remote Keyless Entry (RKE) transmitter is detected, the SJB provides voltage to the courtesy lamps.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Door ajar switch
- 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 COURTESY LAMP OPERATION USING THE INSTRUMENT PANEL DIMMER SWITCH


- Operate the courtesy lamps using the instrument panel dimmer switch.
- Do the interior courtesy lamps illuminate using the instrument panel dimmer switch?

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 interior lamps illuminate?

Yes
INSTALL a new door latch in question. REFER to Doors, Hood and Trunk &/or Locks. TEST the system for normal operation.

No
GO to A3.

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A3 CHECK THE AJAR SWITCH CIRCUIT FOR A SHORT TO GROUND


- Disconnect: SJB C2280c .
- Measure the resistance between the suspect 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 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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