Ford Taurus 2003 - Page 41

PINPOINT TEST P: THE BLOWER MOTOR DOES NOT OPERATE CORRECTLY — MANUAL CLIMATE CONTROL
Test Step Result / Action to Take
P1 CHECK THE BLOWER MOTOR SWITCH
 Ignition OFF.
 Disconnect: Blower Motor Switch C294a.
 Measure the resistance between the blower motor switch pins, component side, in the following blower
motor switch positions:
 Are the resistances less than 5 ohms when continuity is expected and greater than 10,000 ohms
for all others?
Switch Position Continuity Between Pins
low none
med-low 2 and 3
med-high 2, 3, and 4
high 1, 2, and 4
Yes
GO to P2.
No
INSTALL a new blower motor switch (18578). TEST the system
for normal operation.
P2 CHECK CIRCUITS 261 (OG/BK), 752 (YE/RD), AND 754 (LG/WH) FOR AN OPEN
 Disconnect: Blower Motor Resistor C293.
 Measure the resistance between the blower motor switch C294a and the blower motor resistor C293 as
follows:
 Are the resistances less than 5 ohms?
Blower Motor Switch C294a Blower Motor Resistor C293
pin 3, circuit 57 (BK) pin 3, circuit 57 (BK)
pin 4, circuit 261 (OG/BK) pin 2, circuit 261 (OG/BK)
pin 1, circuit 754 (LG/WH) pin 1, circuit 754 (LG/WH)
pin 2, circuit 752 (YE/RD) pin 4, circuit 752 (YE/RD)
Yes
GO to P3.
No
REPAIR the affected circuit(s). TEST the system for normal
operation.
P3 CHECK CIRCUITS 261 (OG/BK), 752 (YE/RD), AND 754 (LG/WH) FOR A SHORT
 Measure the resistances between the blower motor switch C294a:
 pin 1, circuit 754 (LG/WH) and ground.
 pin 2, circuit 752 (YE/RD) and ground.
 pin 4, circuit 261 (OG/BK) and ground.
 Are the resistances greater than 10,000 ohms?
Yes
GO to P4.
No
REPAIR the affected circuit(s). TEST the system for normal
operation.
P4 CHECK THE BLOWER MOTOR RESISTOR
 Measure the resistance between the blower motor resistor pins, component side, as follows:
Blower Motor Resistor Pins Resistance
2 and 3 2.2 ohms
1 and 3 0.9 ohms
Yes
INSTALL a new blower motor (19805). TEST the system for
normal operation.
No
INSTALL a new blower motor resistor (19A706). TEST the
system for normal operation.
Page
41
of
47
2003 Taurus/Sable Workshop Manual
11/22/2011
http://www.fordtechservice.dealerconnection.com/pubs/content/~WS3H/~MUS~LEN/19/
...