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/...
