Does the test lamp illuminate?
K13 CHECK CIRCUIT 1810 (LG/OG) FOR AN OPEN
Ignition ON.
Measure the voltage between A/C clutch relay socket pin 5, circuit 1810 (LG/OG) and ground.
Is the voltage greater than 10 volts?
Yes
GO to
K14
.
No
VERIFY the battery junction box (BJB) fuse 11
(15A) is OK. If OK, REPAIR circuit 1810 (LG/OG)
for an open. TEST the system for normal
operation.
K14 CHECK CIRCUIT 321 (GY/WH) FOR AN OPEN
Ignition OFF.
Measure the resistance between A/C clutch relay socket pin 3, circuit 321 (GY/WH) and A/C compressor clutch field coil
C100-1, circuit 321 (GY/WH).
Is the resistance less than 5 ohms?
Yes
INSTALL a new A/C clutch relay. TEST the
system for normal operation.
No
REPAIR circuit 321 (GY/WH) for an open. TEST
the system for normal operation.
K15 CHECK CIRCUIT 73 (OG/LB) FOR AN OPEN
Ignition OFF.
Disconnect: PCM C175B.
Measure the resistance between A/C clutch relay socket pin 1, circuit 73 (OG/LB) and PCM C175B-25, circuit 73
(OG/LB).
Yes
GO to
K17
.
No
REPAIR circuit 73 (OG/LB) for an open. CLEAR
the DTCs. TEST the system for normal
operation.
Page 33 of 45
2006 Town Car Workshop Manual
12/30/2011
http://www.fordtechservice.dealerconnection.com/pubs/content/~WS6G/~MUS~LEN/19/...
