Ford Repair Questions? Ask a Mechanic for Answers ASAP
1. Check for power on the Light Blue/Black (LB/BK) wire at the master window switch.2. Check for a good ground to the master window switch on the Black (BK) wire. This wire provides the ground circuit for all of the window motors.
If both of these are good you probably have a bad master switch(drivers master switch).
The Light Blue/Black (LB/BK) wire gets its power supply from the accessory delay relay in the Central Junction Box (CJB) located under the instrument panel. The Generic Electronic Module (GEM) controls activation of the accessory delay relay. Fuse 2.17 is a 15 amp fuse in the CJB which supplies power to the relay. Fuse F1.6 is a 60 amp fuse in Battery Junction Box (BJB) which also supplies power to the accessory delay relay. G400(ground) is located at the driver side rear of the vehicle near the tail light assembly. This connection provides a ground for the master window switch.