Ford 2003 Mustang Workshop Manual page 3084

Low
Medium/low
Medium/high
High
Is the resistance less than 5 ohms?
H4 CHECK THE FUNCTION SELECT SWITCH FOR A
SHORT TO BATTERY
Key in OFF position.
Disconnect: Function Selector Switch C294c.
Key in ON position.
Did the blower motor stop operating?
PINPOINT TEST I: NO OPERATION IN HIGH BLOWER SETTING
I1 CHECK CIRCUIT 261 (OG/BK) FOR AN OPEN CIRCUIT
Key in OFF position.
Disconnect: Blower Motor Switch C294a.
Key in ON position.
Turn the function selector switch to the FLOOR position.
Measure the voltage between blower motor switch C294a,
circuit 261 (OG/BK), harness side and ground.
Is the voltage greater than 10 volts?
I2 CHECK CIRCUIT 1205 (BK) FOR AN OPEN
None
2 and 3 only
2, 3 and 4 only
1, 2 and 4 only
Test Step
INSTALL a new heater blower
motor switch. REFER to
412-04 . TEST the system for
normal operation.
Yes
INSTALL a new function selector
switch. REFER to Section 412-
04 . TEST the system for normal
operation.
No
REPAIR circuit 249 (DB/LG) for a
short to battery. TEST the system
for normal operation.
Result / Action to Take
Yes
GO to I2 .
No
REPAIR circuit 261 (OG/BK)
for an open circuit. TEST the
system for normal operation.
Section