Symptom Chart

WARNING: This page is about a different car, the 2020 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

Diagnostics in this article assume a certain skill level and knowledge of Ford-specific diagnostic practices. REFER to: Diagnostic Methods .

Condition	Possible Sources	Actions
The alarm system does not activate from an unauthorized entry at the hood	Refer to the Pinpoint Test	GO to Pinpoint Test A
The alarm system does not activate from an unauthorized entry at a door	Door ajar input	DIAGNOSE the courtesy lamps not illuminating when a door is open. REFER to: Interior Lighting .
The alarm system does not activate from the intrusion sensor	Refer to the Pinpoint Test	GO to Pinpoint Test B
The alarm system does not arm or no turn signals flash confirmation	Refer to the Pinpoint Test	GO to Pinpoint Test C
No traffic horn output during alarm activation	Horn output concern	REFER to: Horn .
The alarm system falsely activates	A valid PATS key read was NOT received when the ignition transitioned to RUN Panic button pressed on a RKE transmitter Door ajar input Intrusion/inclination sensor input Hood ajar input Disconnected Trailer or Wiring Fault on Trailer	An intermittent fault exists. Using a diagnostic scan tool, view the following BCM Parameter Identifications (PIDs) to identify and isolate the cause of the last alarm activation. Most Recent Alarm Trigger Event (ALARM_EVT_1) 2nd Most Recent Alarm Trigger Event (ALARM_EVT_2) 3rd Most Recent Alarm Trigger Event (ALARM_EVT_3) 4th Most Recent Alarm Trigger Event (ALARM_EVT_4) For a PID value of "Panic" causing the false alarm event, the system is operating correctly at this time. INSTRUCT the customer in the correct operation of the panic alarm feature. REFER to "Panic Alarm" in the Owner's Literature. For a PID value of "Door Ajar" causing the false alarm event, DIAGNOSE the ajar switches. REFER to: Interior Lighting . For a PID value of "Interior Motion Detected" or "Tilt Detected" causing the false alarm event, diagnose the intrusion/tilt sensor. GO to Pinpoint Test B For a PID value of "Hood Ajar" causing the false alarm event, diagnose the hood ajar switch. GO to Pinpoint Test D For Disconnected Trailer or Wiring Fault on Trailer- REFER to: Auxiliary Brake System - Vehicles With: Trailer Brake Control . .