Disconnect: Blower Motor C1031.
Measure the resistance between blower motor C1031-2, circuit 515 (OG/RD) and blower motor speed
control C1308-4, circuit 515 (OG/RD).
Is the resistance less than 5 ohms?
Yes
INSTALL a new blower motor. TEST the system for normal
operation.
No
REPAIR circuit 515 (OG/RD) for an open. TEST the system for
normal operation.
M6 CHECK THE EATC MODULE OUTPUT
Ignition OFF.
Remove the fused jumper lead from the blower motor speed control C1308.
Connect: Blower Motor Speed Control C1308.
Ignition ON.
Adjust the blower motor speed to HI.
Measure the voltage between EATC module C228a-8, circuit 754 (LG/WH) and ground by back-probing
the EATC module C228a.
Is the voltage within 2 volts of battery voltage?
Yes
GO to
M7
.
No
GO to
M13
.
M7 CHECK CIRCUIT 754 (LG/WH) FOR AN OPEN OR SHORT TO GROUND
Ignition OFF.
Disconnect: Blower Motor Speed Control C1308.
Disconnect: EATC Module C228a.
Measure the resistance between EATC module C228a-8, circuit 754 (LG/WH) and blower motor speed
control C1308-3, circuit 754 (LG/WH), and measure the resistance between EATC module C228a-8, circuit
754 (LG/WH) and ground.
Is the resistance less than 5 ohms between the EATC module and the blower motor speed control
and greater than 10,000 ohms between the EATC module and ground?
Yes
INSTALL a new blower motor speed control. TEST the system
for normal operation.
No
REPAIR circuit 754 (LG/WH). TEST the system for normal
operation.
M8 CHECK CIRCUIT 371 (PK/WH) FOR AN OPEN
Ignition OFF.
Disconnect: Blower Motor Relay.
Measure the resistance between blower motor relay socket pin 87, circuit 371 (PK/WH) and blower motor
C1031-1, circuit 371 (PK/WH).
Is the resistance less than 5 ohms?
Yes
GO to
M9
.
No
REPAIR circuit 371 (PK/WH) for an open. TEST the system for
normal operation.
M9 CHECK CIRCUIT 181 (BN/OG) FOR VOLTAGE
Measure the voltage between blower motor relay socket pin 86, circuit 181 (BN/OG) and ground.
Yes
GO to
M10
.
No
VERIFY the battery junction box (BJB) fuse 101 (40A) is OK. If
OK, REPAIR circuit 181 (BN/OG) for an open. TEST the system
for normal operation.
Page 37 of 45
2006 Town Car Workshop Manual
12/30/2011
http://www.fordtechservice.dealerconnection.com/pubs/content/~WS6G/~MUS~LEN/19/...