Vehicle: 2007 Ford Expedition, 4WD,
V8-5.4L, Automatic Transmission
Problem: The vehicle was brought to the
shop because the power windows were inoperative. They were all
down about 2” and would not go up or down. The customers stated
that they could hear a buzzing from the master switch.
Details: The shop replaced the master
switch with an OEM part, but the symptoms remained. The
Tech-Assist consultant suggested testing the main power wire. The
test lamp would barely light. Carefully using a power probe to
apply power to that pin, the windows would operate. It was
apparent that there was a voltage drop somewhere.
The Tech-Assist consultant and technician traced the circuits
together in a wiring diagram from ALLDATA Repair. The technician
began tracing the harness and found a wire partially broken under
driver’s door sill plate. It had only a few strands left which
allowed minimal voltage through the circuit.
Confirmed Repair: The technician repaired
the wire and windows worked again. Fixed!