Pinpoint Test E : Both Power Fold Seats Are 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.

E1 CHECK THE SCMJ (POWER FOLD SEAT MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

Ignition ON.

NOTE: If the diagnostic scan tool does not communicate with the SCMJ, REFER to: Communications Network .

Using a diagnostic scan tool, perform the SCMJ self-test.

Were any Diagnostic Trouble Codes (DTCs) retrieved?

Yes	For B154B:11, GO to E2. For B154B:13, GO to E4. For B154B:2A, GO to E6 For all other Diagnostic Trouble Codes (DTCs), REFER to DTC Chart: SCMJ .

GO to E6

E2 CHECK THE SCMJ (POWER FOLD SEAT MODULE) DIAGNOSTIC TROUBLE CODES (DTCS) WITH THE THIRD ROW SEAT CONTROL SWITCH DISCONNECTED
- Ignition OFF.
- Disconnect: Third Row Seat Control Switch C4179 .
- Ignition ON.
- Using a diagnostic scan tool, perform the SCMJ self-test.
Was DTC B154B:13 retrieved?

Yes INSTALL a new third row seat control switch. REFER to: Power Fold Seat Control Switch .

No GO to E3

E3 CHECK THE THIRD ROW SEAT CONTROL SWITCH CIRCUIT FOR A SHORT TO GROUND

Ignition OFF.

Disconnect: SCMJ C4250D .

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4179-5	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10, 000 ohms?

Yes

GO to E9

No	REPAIR the circuit.

E4 CHECK THE SCMJ (POWER FOLD SEAT MODULE) DIAGNOSTIC TROUBLE CODES (DTCS) WITH A FUSED JUMPER WIRE INSTALLED IN THE THIRD ROW SEAT CONTROL SWITCH

Ignition OFF.

Disconnect: Third Row Seat Control Switch C4179 .

Connect a fused jumper wire:

Positive Lead	Measurement / Action	Negative Lead
C4179-5	Courtesy of FORD MOTOR COMPANY	C4179-4

Ignition ON.

Using a diagnostic scan tool, perform the SCMJ self-test.

Was DTC B154B:11 retrieved?

Yes	INSTALL a new third row seat control switch. REFER to: Power Fold Seat Control Switch .

GO to E5

E5 CHECK THE THIRD ROW SEAT CONTROL SWITCH CIRCUITS FOR AN OPEN

Ignition OFF.

Disconnect: SCMJ C4250C and C4250D .

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4179-5	Courtesy of FORD MOTOR COMPANY	C4250D-7

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4179-4	Courtesy of FORD MOTOR COMPANY	C4250C-4

Are the resistances less than 3 ohms?

Yes

GO to E9

No	REPAIR the circuit in question.

E6 CHECK THE THIRD ROW SEAT CONTROL SWITCH RESISTANCE VALUES

Ignition OFF.

Disconnect: SCMJ C4250C and C4250D .

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4250D-7	Courtesy of FORD MOTOR COMPANY	C4250C-4

Switch Position	Resistance
3L	673 - 687 ohms
Both Seats	1, 198 - 1, 222 ohms
3R	219 - 223 ohms
All switches at rest	7, 425 - 7, 575 ohms

Is the resistance within the specified range for each control switch position?

Yes	For B154B:2A, GO to E9. Otherwise, GO to E8

GO to E7

E7 CHECK THE THIRD ROW SEAT CONTROL SWITCH CIRCUITS FOR EXCESSIVE RESISTANCE

Ignition OFF.

Disconnect: Third Row Seat Control Switch C4179 .

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4179-5	Courtesy of FORD MOTOR COMPANY	C4250D-7

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4179-4	Courtesy of FORD MOTOR COMPANY	C4250C-4

Are the resistances less than 3 ohms?

Yes	INSTALL a new third row seat control switch. REFER to: Power Fold Seat Control Switch .

No	REPAIR the circuit in question.

E8 CHECK THE THIRD ROW SEAT LIFT/FOLD MOTOR POSITION SENSOR GROUND CIRCUIT FOR AN OPEN

Disconnect: RH Third Row Seat Lift/Fold Motor 1 C4242 .

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4242-4	Courtesy of FORD MOTOR COMPANY	C4250C-2

Is the resistance less than 3 ohms?

Yes

GO to E9

No	REPAIR the circuit.

E9 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.