1996 Bronco/F-Series

Section 01-10: Seats and Tracks

1996 F-150, F-250, F-350, F-Super Duty and Bronco Workshop Manual

DIAGNOSIS AND TESTING

Pinpoint Tests

PINPOINT TEST A: POWER SEAT MOVES, NOISY OPERATION

A1 VERIFY NOISE

Check alignment of track to floor and seat.
Operate power seat and listen for noise.

Is operation noisy?

Yes	No
REPAIR or REPLACE front seat tracks as required.	Power seat OK.

PINPOINT TEST B: POWER SEAT MOVES BUT IS LOOSE

B1 VERIFY SEAT CONDITION

Operate power seat and check for looseness.

Is power seat loose?

Yes	No
RETIGHTEN all attachment hardware. GO to B2.	Power seat OK.

B2 CHECK SEAT OPERATION

Check if loose condition has been corrected.

Has condition been corrected?

Yes	No
Power seat OK.	REPLACE front seat tracks.

PINPOINT TEST C: POWER SEAT DOES NOT MAKE FULL TRAVEL

C1 CHECK TRACK MOVEMENT

Operate power seat and verify that seat mechanism does not make full travel.

Is power seat travel OK?

Yes	No
Power seat OK.	GO to C2.

C2 TRACK OBSTRUCTION

Check for an obstruction in track mechanism.

Is track mechanism obstructed?

Yes	No
REMOVE obstruction. REPEAT Step C1.	REPAIR or REPLACE front seat tracks as required.

PINPOINT TEST D: TRACK DOES NOT MOVE HORIZONTALLY AND/OR VERTICALLY

D1 CHECK TRACK MOVEMENT

Operate power seat.

Does track move horizontally and vertically?

Yes	No
Power seat OK.	GO to D2.

D2 GROUND CHECK

Disconnect seat motor harness.
Using Rotunda Digital Voltmeter 014-00407 or equivalent, connect one terminal to a known ground.
Check ground Circuit 57 (BK) of the body harness.

Is the resistance less than 5 ohms?

Yes	No
GO to D3.	SERVICE Circuit 57 (BK) and RETEST system.

D3 VERIFY POWER SEAT MOTOR HARNESS

Disconnect seat motor wiring harness from body harness.
Remove driver's seat from vehicle.
Disconnect seat regulator control switch.
Using Rotunda Digital Volt-Ohmmeter 014-00407 or equivalent, check continuity between Pin 7, Circuit 517 (BK/W) at seat regulator control switch connector harness to main power connector Circuit 517 (BK/W).

Is there continuity?

Yes	No
GO to D4.	REPLACE seat regulator and motor harness. RETEST system.

D4 VERIFY SEAT MOTOR HARNESS GROUND

Connect ohmmeter to Pin 7 of the seat motor connector and ground circuit of the harness to the body harness.

Is there continuity?

Yes	No
GO to D5.	REPLACE seat regulator and motor harness.

D5 DRIVER'S SEAT MOTOR HARNESS CHECK

Disconnect 6-pin motor harness connector from seat motor connector and 8-pin connector from seat regulator control switch connector.
Using the following table, compare continuity between the following pins using a DVOM

6-Pin Connector	8-Pin Connector	Continuity
Pin 3	Pin 1	All <100 Ohms
Pin 5	Pin 8	<100 Ohms
Pin 6	Pin 5	<100 Ohms
Pin 1	Pin 4	<100 Ohms
Pin 4	Pin 2	<100 Ohms
Pin 2	Pin 6	<100 Ohms

Are above continuities present?

Yes	No
REMOVE and REPLACE front seat track.	REPLACE seat motor harness and RETEST system.

PINPOINT TEST E: SEAT REGULATOR CONTROL SWITCH DOES NOT FUNCTION PROPERLY

E1 CONTINUITY CHECK, SWITCH NEUTRAL

Using test leads of a self-powered test light or volt-ohmmeter, check for continuity.
Attach one test lead to terminal 5. Contact terminals 1, 2, 4, 3, 6, 8 one at a time.

Is voltage present at each contact?

Yes	No
REPLACE seat regulator control switch.	GO to E2.

E2 CONTINUITY CHECK, SWITCH A

Depress and hold switch button A.
Attach one test lead to terminal 7. With the other test lead check for voltage continuity between terminals 6 and 4.

Is voltage continuity present?

Yes	No
GO to E3.	REPLACE seat regulator control switch.

E3 CONTINUITY CHECK, SWITCH B

Depress and hold switch button B.
Attach one test lead to terminal 7.
With the other test lead, check for voltage continuity between terminals 2 and 1.

Is voltage present?

Yes	No
GO to E4.	REPLACE seat regulator control switch.

E4 CONTINUITY CHECK, SWITCH C

Push and hold switch lever knob C upward.
Attach one test lead to terminal 7.
With the other test lead, check for voltage continuity between terminals 6 and 1.

Is voltage present?

Yes	No
GO to E5.	REPLACE seat regulator control switch.

E5 CONTINUITY CHECK DOWNWARD, SWITCH C

Depress and hold switch lever knob C downward.
Attach one test lead to terminal 7.
With the other test lead, check for voltage continuity between terminals 2 and 4.

Is voltage present?

Yes	No
GO to E6.	REPLACE seat regulator control switch.

E6 CONTINUITY CHECK REARWARD, SWITCH C

Push and hold switch lever knob C rearward.
Attach one test lead to terminal 7.
With the other test lead, check for voltage continuity between terminals 8 and 3.

Is voltage present?

Yes	No
GO to E7.	REPLACE seat regulator control switch.

E7 CONTINUITY CHECK FORWARD, SWITCH C

Push and hold switch lever knob C forward.
Attach one test lead to terminal 7.
With the other test lead, check for voltage continuity between terminal 5.

Is voltage present?

Yes	No
GO to E8.	REPLACE seat regulator control switch.

E8 CONTINUITY CHECK, SWITCH D

Depress and hold switch button D.
Attach one test lead to terminal 7.
With the other test lead, check for voltage continuity between terminals 1 and 2.

Is voltage present?

Yes	No
GO to E9.	REPLACE seat regulator control switch.

E9 CONTINUITY CHECK, SWITCH E

Depress and hold switch button E.
Attach one test lead to terminal 7.
With the other test lead, check for voltage continuity between terminals 4 and 6.

Is voltage present?

Yes	No
Seat control switch OK. REPEAT E1.	REPLACE seat regulator control switch.