Symptom Chart - BLIS®

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.

Condition	Possible Sources	Action
A module does not respond to the diagnostic scan tool	Fuse Communication concern Wiring, terminals or connectors Module	REFER to: Communications Network .
The BLIS® is inoperative or does not function correctly	Refer to the Pinpoint Tests	GO to Pinpoint Test A
The BLIS® has poor or inconsistent performance	Refer to the Pinpoint Tests	GO to Pinpoint Test A
The BLIS® message center warnings are not displayed and the exterior mirror BLIS®/ CTA LED does not illuminate	Refer to the Pinpoint Tests	GO to Pinpoint Test A
Trailer isn't identified in the message center (BLIS® with Trailer Tow)	Refer to the Pinpoint Tests	GO to Pinpoint Test A
An exterior mirror BLIS®/ CTA LED is always on	Refer to the Pinpoint Tests	GO to Pinpoint Test C
An exterior mirror BLIS®/ CTA LED does not illuminate	Refer to the Pinpoint Tests	GO to Pinpoint Test D
The IPC message center displays a blocked sensor message	Refer to the Pinpoint Tests	GO to Pinpoint Test E
The BLIS® cannot be turned off in the message center	Refer to the Pinpoint Tests	GO to Pinpoint Test F
The IPC message center or the LH upper steering wheel switch is not operating correctly	Wiring, terminals or connectors Message center switch (part of the LH upper steering wheel switch) Clockspring SCCM IPC	See: The message center is not operating correctly. REFER to: Instrumentation, Message Center and Warning Chimes .