Is the resistance less than 5 ohms?
O9 CHECK CIRCUIT 261 (OG/BK)
Measure the resistance between the blower motor speed control C271b, circuit 261 (BK) and the blower motor C2006, circuit 261 (BK).
Is the resistance less than 5 ohms?
Yes
GO to
O10
.
No
REPAIR circuit 261 (OG/BK).
TEST the system for normal
operation.
O10 CHECK CIRCUIT 57 (BK)
Measure the resistance between the blower motor speed control C271a pin 2, circuit 57 (BK) and ground.
Is the resistance less than 5 ohms?
Yes
INSTALL a new blower motor.
TEST the system for normal
operation.
No
REPAIR circuit 57 (BK). TEST
the system for normal
operation.
O11 CHECK THE BLOWER MOTOR SPEED CONTROL INPUT SIGNAL
Ignition OFF.
Remove the fused jumper leads from the blower motor speed control C271a and C271b.
Connect: Blower Motor Speed Control C271a.
Ignition ON.
Press the MAX A/C manual override button and adjust the blower speed to maximum.
Measure the voltage between the blower motor speed control C271a pin 3, circuit 776 (OG/BK) and ground by back-probing the blower
motor speed control C271a pin 3, circuit 776 (OG/BK).
Is the voltage approximately 5 volts?
Yes
INSTALL a new blower motor
speed control. TEST the
system for normal operation.
No
GO to
O12
.
O12 CHECK CIRCUIT 776 (OG/BK) FOR A SHORT TO GROUND
Disconnect: RCC Module C228.
Measure the resistance between the blower motor speed control C271a pin 3, circuit 776 (OG/BK) and ground.
Is the resistance greater than 10,000 ohms?
Yes
INSTALL a new RCC module.
TEST the system for normal
operation.
No
REPAIR circuit 776 (OG/BK).
TEST the system for normal
operation.
Page 40 of 47
2003 Taurus/Sable Workshop Manual
11/22/2011
http://www.fordtechservice.dealerconnection.com/pubs/content/~WS3H/~MUS~LEN/19/...
