Pinpoint Test A : A Single Power Folding Headrest Is Inoperative

WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.

A1 CHECK THE SUSPECT HEADREST ACTUATOR GROUND CIRCUIT FOR AN OPEN

Ignition OFF.

Disconnect: Suspect Headrest Actuator C4543 (LH) or C4542 (RH).

For LH, measure:

Positive Lead	Measurement / Action	Negative Lead
C4543-2	Courtesy of FORD MOTOR COMPANY	Ground

For RH, measure:

Positive Lead	Measurement / Action	Negative Lead
C4542-2	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance less than 3 ohms?

Yes

GO to A2

No	REPAIR the circuit.

A2 CHECK FOR VOLTAGE TO THE SUSPECT HEADREST ACTUATOR

NOTE: The following step uses a test light to simulate normal circuit loads. Use only a Rotunda Test Lamp (SGT27000) or 250-300mA incandescent bulb test lamp. To avoid connector terminal damage, use the Rotunda Flex Probe kit for the test lamp probe connection to the vehicle. Do not use the test lamp probe directly on any connector.

For LH, connect:

Positive Lead	Measurement / Action	Negative Lead
C4543-1	Courtesy of FORD MOTOR COMPANY	C4543-2

For RH, connect:

Positive Lead	Measurement / Action	Negative Lead
C4542-1	Courtesy of FORD MOTOR COMPANY	C4542-2

Ignition ON.

While observing the test light, press and release the headrest fold switch.

Did the test light momentarily illuminate when the headrest fold switch was activated?

Yes	INSTALL new headrest actuator.

GO to A3

A3 CHECK THE SUSPECT HEADREST ACTUATOR VOLTAGE FEED CIRCUIT FOR AN OPEN

Ignition OFF.

Disconnect: SCMJ C4250D .

For LH, measure:

Positive Lead	Measurement / Action	Negative Lead
C4250D-13	Courtesy of FORD MOTOR COMPANY	C4543-1

For RH, measure:

Positive Lead	Measurement / Action	Negative Lead
C4250D-4	Courtesy of FORD MOTOR COMPANY	C4542-1

Is the resistance less than 3 ohms?

Yes

GO to A4

No	REPAIR the circuit.

A4 CHECK THE SCMJ (POWER FOLD SEAT MODULE) OPERATION

Ignition OFF.

Disconnect and inspect the SCMJ connectors.

Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins as necessary
- pushed-out pins - install new pins as necessary

Reconnect the SCMJ connectors. Make sure they seat and latch correctly.

Reconnect all previously disconnected connectors.

Ignition ON.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes	CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new SCMJ. REFER to: Power Fold Seat Module (PFSM) .

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.