Crown Victoria V8-4.6L SOHC VIN 6 (1996)
-
Remove fuse 4 (10A) Town Car, fuse 8 (15A) Crown Victoria, Grand Marquis, from fuse junction panel.
-
Using a voltmeter, measure for voltage at fuse input cavity.
Is voltage B+?
YES
GO to A8.
NO
SERVICE supply to to fuse 4 (10A) Town Car, fuse 8 (15A) Crown Victoria, Grand Marquis. RESTORE vehicle. RETEST system.
A8 - Check Circuit 54 (LG/Y) For Open
-
Using an ohmmeter, measure resistance of circuit 54 (LG/Y) between lighting control module pin C3-11 and fuse output cavity.
Is resistance 5 ohms or less?
YES
REPLACE to fuse 4 (10A) Town Car, fuse 8 (15A) Crown Victoria, Grand Marquis. RESTORE vehicle. RETEST system.
NO
SERVICE Circuit 54 (LG/Y) for open. RESTORE vehicle. RETEST system.
A9 - Check Logic Ground For Open
-
Using an ohmmeter connected to ground, measure resistance at lighting control module pin C3-9, circuit 676 (PK/0) Town Car or circuit 57 (BK)
Crown Victoria, Grand Marquis.
Is resistance less than 5 ohms?
YES
GO to Computers and Control Systems to diagnose network concern. See: Powertrain Management/Computers and Control
Systems/Information Bus
NO
SERVICE Circuit 676 (PK/O) Town Car or circuit 57 (BK) Crown Victoria, Grand Marquis for open. RESTORE vehicle. RETEST
system.
B - Warning Chime Inop
Pinpoint Test B: Warning Chime Inoperative
B1 - Check For Supply Voltage
-
Ignition switch in RUN position.
-
Connect a voltmeter to a known good ground.
-
Connect second lead to pin C1-9, circuit 1003 (GY/Y) Town Car, circuit 640 (R/Y) Crown Victoria Grand Marquis at lighting control module.
Is battery voltage present?
YES
GO to B2.
NO
GO to B3.
B2 - Check For Ignition Supply
-
With voltmeter still connected to ground, connect second lead to pin C1-1, circuit 294 (W/LB) Town Car, circuit 296 (W/P) Crown Victoria,
Grand Marquis.
Is battery voltage present?
YES
GO to B7.
NO
G0 to B5.
B3 - Check Supply Circuit 640 (R/Y) Resistance
-
Disconnect lighting control module.
-
Using an ohmmeter connected to a known good ground, connect second lead to pin C1-9, circuit 1003 (GY/Y) Town Car, circuit 640 (R/Y)
Crown Victoria, Grand Marquis.
-
Check resistance.
Is resistance 5 ohms or less?
YES
SERVICE circuit 1003 (GY/Y) Town Car, circuit 640 (R/Y) Crown Victoria, Grand Marquis for short to ground. REPLACE fuse 13
(15A). RESTORE vehicle. RETEST system.
NO
GO to B4.