Pinpoint Test F: The Interior Courtesy Lamps Stay On Continuously

Interior Lighting

Pinpoint Test F: The Interior Courtesy Lamps Stay On Continuously

Refer to Wiring Diagram Set 89 (Fusion/Milan/MKZ, Fusion Hybrid, Milan Hybrid, MKZ Hybrid), Interior Lamps for schematic and connector information. Diagrams By Number

Refer to Wiring Diagram Set 110 (Fusion/Milan/MKZ, Fusion Hybrid, Milan Hybrid, MKZ 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, MKZ Hybrid), Luggage Compartment Lid Release for schematic and connector information. Diagrams By Number

Normal Operation

When any door or liftgate 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 Smart Junction Box (SJB) supplies voltage to the interior courtesy lamps.





This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Door ajar switch
- SJB


PINPOINT TEST F: THE INTERIOR COURTESY LAMPS STAY ON CONTINUOUSLY

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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F1 CHECK THE SJB DTCs

NOTE: Make sure all doors are closed before running the SJB on-demand self-test.

- Carry out the SJB on-demand self-test.
- Is DTC B1320, B1328, B1336 or B1572 recorded?

Yes
GO to F2.

No
GO to F5.

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F2 CHECK FOR VOLTAGE TO THE DOOR AJAR SWITCH

- Ignition OFF.
- Disconnect: Suspect Door Ajar Switch .
- Measure the voltage between the suspect door ajar switch, harness side and ground as follows:









- Is the voltage greater than 10 volts?

Yes
GO to F3.

No
GO to F4.

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F3 CHECK FOR VOLTAGE TO THE DOOR AJAR SWITCH USING THE CONNECTOR GROUND

- Measure the voltage between the suspect door ajar switch, harness side and ground as follows:









- Is the voltage greater than 10 volts?

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. CLEAR the DTCs. REPEAT the self-test.

No
REPAIR the ground circuit in question for an open. CLEAR the DTCs. REPEAT the self-test.

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F4 CHECK THE DOOR AJAR SWITCH INPUT CIRCUIT FOR AN OPEN

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









- Is the resistance less than 5 ohms?

Yes
GO to F5.

No
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

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F5 CHECK THE SJB INTERIOR COURTESY LAMP OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE

NOTE: Make sure the doors are closed for correct test results.

- Ignition OFF.
- Disconnect: SJB C2280a .
- Ignition ON.
- Observe the interior courtesy lamps.
- Do the interior courtesy lamps continue to illuminate?

Yes
REPAIR circuit VLN33 (GY/VT) for a short to voltage. CLEAR the DTCs. REPEAT the self-test.

No
GO to F6.

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F6 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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