PINPOINT TEST F : The Heated Seats Are Inoperative

F1 CHECK FOR VOLTAGE TO THE REAR HEATED SEAT MODULE

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3304B-1	Courtesy of FORD MOTOR COMPANY	Ground
C3304B-2	Courtesy of FORD MOTOR COMPANY	Ground

Are the voltages greater than 11 volts?

Yes	GO to F2.
No	VERIFY Battery Junction Box (BJB) fuse 41 (30A) and BCM fuse 34 (10A) are OK. If OK, REPAIR the circuit(s). If not OK, REFER to the OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION to identify possible causes of the circuit short.

F2 CHECK THE HEATED SEAT MODULE GROUND CIRCUIT FOR AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3304B-5	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance less than 3 ohms?

Yes	GO to F3.
No	REPAIR the circuit.

F3 CHECK THE REAR HEATED SEAT SWITCH OUTPUT

While pressing and releasing the LH rear heated seat switch, measure:

Positive Lead	Measurement / Action	Negative Lead
C3304A-2	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance less than 5 ohms when the heated seat switch is pressed and greater than 10, 000 ohms when the heated seat switch is released?

Yes	GO to F5.
No	GO to F4.

F4 CHECK THE REAR HEATED SEAT SWITCH GROUND CIRCUIT FOR AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3198A-10	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance less than 3 ohms?

Yes	INSTALL a new auxiliary climate control assembly. REFER to REFER to Auxiliary Climate Control .
No	REPAIR the circuit.

F5 CHECK THE TEMPERATURE SENSOR RETURN CIRCUIT FOR AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3304A-12	Courtesy of FORD MOTOR COMPANY	C3304A-3

Is the resistance less than 300, 000 ohms?

Yes	INSTALL a new heated seat module. REFER to Heated Seat Module .
No	REPAIR circuit CHS56 (YE/VT) for an open.