Symptom Chart(s)

WARNING: This page is about a different car, the 2024 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 .

NOTE: The customer trailer needs to be connected to the vehicle to properly diagnose a BLIS ® with trailer coverage system concern (if equipped).

NOTE: Rule out any base BLIS ®/ CTA system concerns prior to diagnosing the BLIS ® with trailer coverage system (if equipped).

Symptom Chart - BLIS ®

Condition	Action
A module does not respond to the diagnostic scan tool	GO to Pinpoint Test G
The BLIS ® is inoperative or does not function correctly	GO to Pinpoint Test A
The BLIS ® has poor or inconsistent performance	GO to Pinpoint Test A
The BLIS ® message center warnings are not displayed and the exterior mirror BLIS ®/ CTALED does not illuminate	GO to Pinpoint Test A
Trailer is not identified in the message center (BLIS ® with trailer coverage)	GO to Pinpoint Test A
An exterior mirror BLIS ®/ CTALED is always on	GO to Pinpoint Test C
An exterior mirror BLIS ®/ CTALED does not illuminate	GO to Pinpoint Test D
The IPC message center displays a blocked sensor message	GO to Pinpoint Test E
The BLIS ® cannot be turned off in the message center	GO to Pinpoint Test F
The IPC message center or the LH upper steering wheel switch is not operating correctly	GO to Pinpoint Test L
The SODL does not respond to the diagnostic scan tool	GO to Pinpoint Test H
The SODR does not respond to the diagnostic scan tool	GO to Pinpoint Test I
The SODCMC does not respond to the diagnostic scan tool	GO to Pinpoint Test J
The SODCMD does not respond to the diagnostic scan tool	GO to Pinpoint Test K

Symptom Chart - CTA

Condition	Action
A module does not respond to the diagnostic scan tool	GO to Pinpoint Test G
The CTA system is inoperative or does not function correctly	GO to Pinpoint Test B
The CTA system has poor or inconsistent performance	GO to Pinpoint Test B
The CTA system message center warnings are not displayed and the exterior mirror BLIS ®/ CTALED does not illuminate	GO to Pinpoint Test B
An exterior mirror BLIS ®/ CTALED does not illuminate when the tone sounds for the CTA system	GO to Pinpoint Test B
An exterior mirror BLIS ®/ CTALED is always on	GO to Pinpoint Test C
An exterior mirror BLIS ®/ CTALED does not illuminate	GO to Pinpoint Test D
The IPC message center displays a blocked sensor message	GO to Pinpoint Test E
The CTA system cannot be turned off in the message center	GO to Pinpoint Test F

Symptom Chart - BLIS ® with trailer coverage

Condition	Action
A module does not communicate with the diagnostic scan tool	GO to Pinpoint Test G
The BLIS ® with trailer coverage system is inoperative (when a trailer is connected BLIS ® and CTA automatically shut off)	GO to Pinpoint Test M
The BLIS ® with trailer coverage receives late alerts. (no alerting alongside trailer, only when target is alongside vehicle)	GO to Pinpoint Test N
The BLIS ® with trailer coverage receives early alerts. (alerting when target is far behind the BLIS ® with trailer coverage blind spot zone)	GO to Pinpoint Test O
The BLIS ® with trailer coverage system receives false alerts.	GO to Pinpoint Test P
The BLIS ® with trailer coverage is missing target vehicles.	GO to Pinpoint Test Q

Symptom Chart - Reverse Brake Assist

Condition	Action
The reverse brake assist is inoperative or does not operate correctly	GO to Pinpoint Test R