Ford 2003 Mustang Workshop Manual page 3656

Circuit
543
(DG)
543
(DG)
544
(VT)
544
(VT)
542
(YE)
542
(YE)
542
(YE)
542
(YE)
Is the circuit logic OK?
C2 CHECK THE EXTERIOR REAR VIEW MIRROR
CONTROL
Remove the exterior rear view mirror control. Leave the
harness connected.
Measure for voltage or resistance at exterior rear view
mirror control C527 while actuating the exterior rear view
mirror control according to the following chart.
Exterior rear view
Pin Circuit
6 542
(YE)
6 542
(YE)
6 542
(YE)
6 542
(YE)
4 540
(RD)
4 540
(RD)
3 541
(DB)
3 541
(DB)
Passenger side selected
8 543
position resistance
Passenger
Left Greater than 10 volts
Right Less than 5 ohms
Up Greater than 10 volts
Down Less than 5 ohms
Left Less than 5 ohms
Right Greater than 10 volts
Up Less than 5 ohms
Down Greater than 10 volts
Measure for
mirror control resistance or
position
Left Less than 5 ohms
Right Greater than 10
Up Less than 5 ohms
Down Greater than 10
Driver side selected
Left Greater than 10
Right Less than 5 ohms
Up Greater than 10
Down Less than 5 ohms
Left Greater than 10
Yes
REPAIR the circuits. TEST the
system for normal operation.
No
INSTALL a new exterior rear
view mirror control. REFER to
Switch—Exterior Rear View
Mirror Control
voltage
TEST the system for normal
operation.
volts
volts
volts
volts
in this section.