NOTE: In wiring diagram, master window control switch harness connectors are labeled as C501 and C509. In master window control switch test, terminal numbers have been changed to for clarity. Identification has been changed for test references only.

Remove master window control switch from vehicle. Check continuity between specified terminals while operating switch to specified position. See MASTER WINDOW CONTROL SWITCH TESTING table. See Fig 1 . Replace master window control switch if continuity between specified terminals is not as specified.

MASTER WINDOW CONTROL SWITCH TESTING

Switch Position	Terminals No.	Continuity
Any	8 & 9	No
Neutral	4, 5, 6, 7, 8, 10, 11, 12 & 13	Yes
Lock-Out Circuit
Locked	3 & 9	No
Unlocked	3 & 9	Yes
Driver's Side
Up	8 & 11; 9 & 10	Yes
Down	8 & 10; 9 & 11	Yes
Passenger's Side
Up	8 & 12; 9 & 13	Yes
Down	8 & 13; 9 & 12	Yes
Left Rear
Up	6 & 9; 7 & 8	Yes
Down	6 & 8; 7 & 9	Yes
Right Rear
Up	4 & 9; 5 & 8	Yes
Down	4 & 8; 5 & 9	Yes

Fig 1: Identifying Power Window Master Switch Terminals

Courtesy of FORD MOTOR CO.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Master Window Control Switch

Use the Manual With the Right Hardware

When to See a Mechanic

Rather have a pro handle this?