PINPOINT TEST AI : No Power To The DLC

WARNING: This page is about a different car, the 2017 Lincoln Navigator and 2017 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

AI1 CHECK THE DLC PINS FOR DAMAGE
- Ignition OFF.
- Disconnect the diagnostic scan tool cable from the DLC.
- Inspect DLC pins 4, 5 and 16 for damage.
Are DLC pins 4, 5 and 16 OK?

Yes GO to AI2.

No REPAIR the DLC as necessary.

AI2 CHECK THE DLC VOLTAGE SUPPLY FOR AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
C251-16	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 11 volts?

Yes	GO to AI3.
No	VERIFY the BCM fuse 24 (15A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the OEM Electrical Wiring Diagram Introduction to identify the possible causes of the circuit short.

AI3 CHECK THE DLC GROUND CIRCUITS FOR AN OPEN

Disconnect: Negative Battery Cable.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C251-4	Courtesy of FORD MOTOR COMPANY	Ground
C251-5	Courtesy of FORD MOTOR COMPANY	Ground

Are the resistances less than 3 ohms?

Yes	REPAIR the diagnostic scan tool. CONNECT the negative battery cable.
No	REPAIR the circuit in question. CONNECT the negative battery cable.