Pinpoint Test N : The Right Heated Seat Is Inoperative - With Heated/Ventilated Seats

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.

WARNING: Incorrect repair techniques or actions can cause an accidental Supplemental Restraint System (SRS) deployment. Never compromise or depart from these instructions. Failure to precisely follow all instructions could result in serious personal injury from an accidental deployment.

N1 CHECK THE FCIM (FRONT CONTROLS INTERFACE MODULE) HEATED SEAT CONTROL SWITCH PID (PARAMETER IDENTIFICATION)
- Start the engine.
- Using a diagnostic scan tool, monitor the FCIM CC_SW_P_HSEATS PID while pressing and releasing the passenger heated seat control switch.
Did the PID change when the passenger heated seat control switch was pressed and released?

Yes GO to N2

No INSTALL a new FCIM. Refer to the appropriate Information and Entertainment Systems article for the procedure.

N2 CHECK FOR SCME (FRONT SEAT CLIMATE CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

Ignition OFF.

Ignition ON.

Using a diagnostic scan tool, perform SCME self-test.

Are any SCME Diagnostic Trouble Codes (DTCs) present?

Yes	For DTC B1155:01, B1155:11, B1155:12, B1155:13 or B1155:1A, GO to N4For DTC B1151:4B, B120A:01, B120A:11 or B120A:15, GO to N6 For all other Diagnostic Trouble Codes (DTCs), REFER to DTC Chart: SCME .

GO to N3

N3 CHECK THE HEATED SEAT VOLTAGE SUPPLY CIRCUITS FOR AN OPEN

REFER to: Supplemental Restraint System (SRS) Depowering .

Disconnect: Driver Side Airbag In-line C3518 .

Disconnect: DSM C341B .

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C341B-2	Courtesy of FORD MOTOR COMPANY	Ground
C341B-5	Courtesy of FORD MOTOR COMPANY	Ground

Are the voltages greater than 11 volts?

Yes

GO to N4

No	REPAIR the circuit in question. GO to N15

N4 CHECK THE HEATER ELEMENT POWER CIRCUIT FOR A SHORT TO VOLTAGE

REFER to: Supplemental Restraint System (SRS) Depowering .

Disconnect: Driver Side Airbag In-line C3518 (if not previously disconnected).

Disconnect: Passenger Side Airbag In-line C3519 .

Disconnect: DSM C341D and C341E .

Disconnect: Right Front Seat Cushion Heater C3002 .

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3002-1	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the circuit. GO to N15

GO to N5

N5 CHECK THE HEATER ELEMENT POWER CIRCUIT FOR AN OPEN OR SHORT TO GROUND

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3002-1	Courtesy of FORD MOTOR COMPANY	Ground

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3002-1	Courtesy of FORD MOTOR COMPANY	C341D-1
C3002-1	Courtesy of FORD MOTOR COMPANY	C341D-2

Are the resistances greater than 10, 000 ohms between the passenger seat cushion heater mat and ground; and less than 3 ohms between the passenger seat cushion heater mat and the DSM?

Yes

GO to N9

No	REPAIR the affected circuit. GO to N15

N6 CHECK THE HEATED SEAT TEMPERATURE SENSOR CIRCUIT FOR AN OPEN OR SHORT TO GROUND

REFER to: Supplemental Restraint System (SRS) Depowering .

Disconnect: Driver Side Airbag In-line C3518 .

Disconnect: Passenger Side Airbag In-line C3519 .

Disconnect: DSM C341D and C341E .

Disconnect: Right Front Seat Cushion Heater C3002 .

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3002-2	Courtesy of FORD MOTOR COMPANY	Ground

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3002-2	Courtesy of FORD MOTOR COMPANY	C341E-4

Is the resistance greater than 10, 000 ohms between the passenger seat cushion heater mat and ground; and less than 3 ohms between the passenger seat cushion heater mat and the FCIM?

Yes

GO to N7

No	REPAIR the circuit. GO to N15

N7 CHECK THE HEATED SEAT TEMPERATURE SENSOR RETURN CIRCUIT FOR AN OPEN OR SHORT TO GROUND

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3002-3	Courtesy of FORD MOTOR COMPANY	Ground

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3002-3	Courtesy of FORD MOTOR COMPANY	C341E-2

Is the resistance greater than 10, 000 ohms between the passenger seat cushion heater mat and ground; and less than 3 ohms between the passenger seat cushion heater mat and the DSM?

Yes

GO to N8

No	REPAIR the open circuit or REFER to the Wiring Diagrams information to identify the possible causes of the circuit short. GO to N15

N8 CHECK THE HEATED SEAT TEMPERATURE SENSOR CIRCUIT FOR A SHORT TO VOLTAGE

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3002-2	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the circuit. GO to N15

GO to N13

N9 CHECK THE HEATER ELEMENT GROUND CIRCUIT FOR AN OPEN

Disconnect: Right Front Seat Backrest Heater C3316 .

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3316-2	Courtesy of FORD MOTOR COMPANY	C341D-6
C3316-2	Courtesy of FORD MOTOR COMPANY	C341D-10

Are the resistances less than 3 ohms?

Yes

GO to N10

No	REPAIR the affected circuit. GO to N15

N10 CHECK CUSHION HEATED SEAT MAT FOR AN OPEN OR SHORT TO GROUND

Measure the component side resistance between:

Positive Lead	Measurement / Action	Negative Lead
Courtesy of FORD MOTOR COMPANY C3002-1, Component Side	Courtesy of FORD MOTOR COMPANY	Courtesy of FORD MOTOR COMPANY C3002-4, Component Side
Courtesy of FORD MOTOR COMPANY C3002-1, Component Side	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance between 0.6 and 2 ohms between pins 1 and 4; and greater than 10, 000 ohms between pin 1 and ground?

Yes

GO to N11

No	INSTALL a new passenger seat cushion heater mat. GO to N15

N11 CHECK THE BACKREST HEATED SEAT MAT FOR AN OPEN OR SHORT TO GROUND

Measure the component side resistance between:

Positive Lead	Measurement / Action	Negative Lead
Courtesy of FORD MOTOR COMPANY C3316-1, Component Side	Courtesy of FORD MOTOR COMPANY	Courtesy of FORD MOTOR COMPANY C3316-2, Component Side
Courtesy of FORD MOTOR COMPANY C3316-2, Component Side	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance between 0.6 and 2 ohms between pins 1 and 2; and greater than 10, 000 ohms between pin 2 and ground?

Yes

GO to N12

No	INSTALL a new passenger seat backrest heater mat. GO to N15

N12 CHECK THE CIRCUIT BETWEEN THE CUSHION HEATER MAT AND BACKREST HEATER MAT FOR AN OPEN AND SHORT TO GROUND

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3002-4	Courtesy of FORD MOTOR COMPANY	Ground

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3002-4	Courtesy of FORD MOTOR COMPANY	C3316-1

Is the resistance greater than 10, 000 ohms between the passenger seat cushion heater mat and ground; and less than 3 ohms between the passenger seat cushion heater mat and the backrest heater mat?

Yes

GO to N14

No	REPAIR the circuit. GO to N15

N13 CHECK THE HEATED SEAT TEMPERATURE SENSOR FOR AN OPEN OR SHORT TO GROUND

Measure the component side resistance between:

Positive Lead	Measurement / Action	Negative Lead
Courtesy of FORD MOTOR COMPANY C3002-2, Component Side	Courtesy of FORD MOTOR COMPANY	Courtesy of FORD MOTOR COMPANY C3002-3, Component Side
Courtesy of FORD MOTOR COMPANY C3002-2, Component Side	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance between 300 and 300, 000 ohms between pins 2 and 3; and greater than 10, 000 ohms between pin 2 and ground?

Yes

GO to N14

No	INSTALL a new driver seat cushion heater mat. GO to N15

N14 CHECK THE SCME (FRONT SEAT CLIMATE CONTROL MODULE) OPERATION

Ignition OFF.

Disconnect and inspect all of the DSM 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 DSM connectors. Make sure they seat and latch correctly.

NOTE: Do not reconnect Passenger Side Airbag In-line C3519 or Driver Side Airbag In-line C3518 at this time.

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 SCME. Refer to: Driver Front Seat Module (DSM) . GO to N15.

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. GO to N15

N15 VERIFY THE SRS (SUPPLEMENTAL RESTRAINT SYSTEM) PROVES OUT SUCCESSFULLY
- REFER to: Supplemental Restraint System (SRS) Depowering .
- Connect: Driver Side Airbag In-line C3518 .
- Connect: Passenger Side Airbag In-line C3519 .
- Connect all previously disconnected connectors.
- REFER to: Supplemental Restraint System (SRS) Repowering .
Did the SRS prove out successfully?

Yes Repair is complete. RETURN the vehicle to the customer.

No REFER to: Airbag Supplemental Restraint System (SRS) .