Possible Cause
PINPOINT TEST M : A DOOR LOCK INDICATOR IS ALWAYS ON
M1 CHECK THE COURTESY LAMP OPERATION
Check the operation of the courtesy lamps from each door.
Do the courtesy lamps operate correctly?
Yes | GO to M2 |
|---|---|
No | REFER to: Interior Lighting (417-02 Interior Lighting, Diagnosis and Testing). |
M2 CHECK THE UNLOCK FEEDBACK FOR CORRECT OPERATION
Ignition OFF. Disconnect suspect door lock indicator harness connector. Ignition ON. Unlock the doors using the door lock control switch. Measure:
Click to display connectors
Left Front Door
Positive Lead | Measurement / Action | Negative Lead |
|---|---|---|
C573-6 | C573-2 |
Click to display connectors
Right Front
Positive Lead | Measurement / Action | Negative Lead |
|---|---|---|
C649-6 | C649-2 |
Is the voltage greater than 11 volts?
Yes | For vehicles not equipped with a memory seat, GO to M4 For vehicles equipped with a memory seat, GO to M5 |
|---|---|
No | GO to M3 |
M3 CHECK THE UNLOCK FEEDBACK CIRCUIT FOR AN OPEN
Ignition OFF. Disconnect suspect door latch. Measure:
Click to display connectors
Left Front Door
Positive Lead | Measurement / Action | Negative Lead |
|---|---|---|
C573-2 | C525-4 |
Click to display connectors
Right Front
Positive Lead | Measurement / Action | Negative Lead |
|---|---|---|
C649-2 | C609-5 |
Is the resistance less than 3 ohms?
Yes INSTALL a new door latch.
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.