Crown Victoria V8-4.6L SOHC VIN 6 (1996)
A - No Communication With Lighting Control Module (LCM)
Pinpoint Test A: No Communication With Lighting Control Module
A1 - Check Circuit 195 (T/W) For Power
-
Disconnect lighting control module connector C3.
-
Using a voltmeter, measure for voltage at lighting control module connector pin C3-6, circuit 195 (T/W).
Is voltage B+?
YES
GO to A5.
NO
GO to A2.
A2 - Check Circuit 195 (T/W) For Short To Ground
-
Remove fuse 15 (15A) Town Car, fuse 4 (15A) Crown Victoria, Grand Marquis from fuse junction panel.
-
Using an ohmmeter connected to ground, measure resistance at lighting control module pin C3-6, circuit 195 (T/W).
Is resistance less than 5 ohms?
YES
SERVICE circuit 185 (T/W) for short to ground. REPLACE fuse 15 (15A) Town Car, fuse 4 (15A) Crown Victoria, Grand Marquis.
RESTORE vehicle. RETEST system.
NO
GO to A3.
A3 - Check Supply To Fuse 4 (15A)
-
Remove fuse 15 (15A) Town Car, fuse 4 (15A) Crown Victoria, Grand Marquis from fuse junction panel.
-
Using a voltmeter, measure for voltage at fuse input cavity.
Is voltage B+?
YES
SERVICE supply to fuse 15 (15A) Town Car, fuse 4 (15A) Crown Victoria, Grand Marquis. RESTORE vehicle. RETEST system.
NO
GO to A4.
A4 - Check Circuit 195 (T/W) For Open
-
Using an ohmmeter, measure resistance of Circuit 195 (T/W) between lighting control module pin C3-6 and output cavity of fuse.
Is resistance 5 ohms or less?
YES
REPLACE fuse 15 (15A) Town Car, fuse 4 (15A) Crown Victoria, Grand Marquis. RESTORE vehicle. RETEST system.
NO
SERVICE Circuit 195 (T/W) for open. RESTORE vehicle. RETEST system.
A5 - Check Circuit 54 (LG/Y) For Power
-
Disconnect lighting control module (LCM) connector C3.
-
Using a voltmeter, measure voltage at lighting control module connector pin C3-11, circuit 54 (LG/Y).
Is voltage B+?
YES
GO to A9.
NO
GO to A6.
A6 - Check Circuit 54 (LG/Y) For Short To Ground
-
Remove fuse 4 (10A) Town Car, fuse 8 (15A) Crown Victoria, Grand Marquis, from fuse junction panel.
-
Using an ohmmeter connected to ground, measure resistance at lighting control module pin C3-11, circuit 54 (LG/Y).
Is resistance less than 5 ohms?
YES
SERVICE Circuit 54 (LG/Y) for short to ground. REPLACE fuse 4 (10A) Town Car, fuse 8 (15A) Crown Victoria, Grand Marquis.
NO
GO to A7.
A7 - Check Supply To Fuse 8 (15A)