Question about 2004 Lincoln Town Car

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Trying to read the lcm schematic - 2004 Lincoln Town Car

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  • Lincoln Master
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You can get wiring and fusebox diagrams at Autozone.com for free when you register your car on their site.

The wiring diagrams are color coded, you can use some of the computer tools to magnify the results so you can see the details better. Use the print Preview feature after your mouse click. Then you can manipulate and print the results.

I hope I have answered your question. Please rate my info

Posted on Nov 06, 2012

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1 Answer

2005 merc grand marquis Headlights keep blowing a fuse


Does your Grand Marquis have head lamps with auto lamps ? Which fuse keeps blowing ? Could be a shorted LCM - lighting control module ?

Lighting Control Module (LCM)
The LCM eliminates the electronic interference and heat associated with the thermoelectric devices used previously. The LCM is a microprocessor-based module that controls several vehicle subsystems. It responds to electrical input signals from various switches, sensors, and external modules..

Visual Inspection Chart Mechanical Electrical
  • Headlamp switch
  • Central junction box (CJB) fuse(s).
    • 1 (15A)
    • 9 (20A)
    • 26 (10A)
    • 15 (7.5A)
    • 7 (10A)
  • Headlamp bulb
  • Circuitry
  • Headlamp switch
  • Lighting control module (LCM)
  • Underhood power distribution box (PDB)
    • F104 (40A)
    • F01 (20A)
    • F02 (25A)

Feb 12, 2017 | Cars & Trucks

1 Answer

2000 lincoln town car light control module wiring diagrams


You don't need a wiring diagram ,what you need is a scan tool that will pull codes from the LCM , an LCM Parameter Identification (PID) Index ! Checking codes first !
LCM Diagnostic Trouble Code (DTC) Index DTC Description DTC Caused By Action B1312 Lamp Headlamp Input-Short to B+ LCM REFER to Section 417-01 . B1334 Decklid Ajar-Short to Gnd LCM REFER to Section 501-14B . B1340 ESC Tone Input Request Short to Ground LCM REFER to Section 501-14B . B1342 ECU-Defective LCM REPLACE the LCM. REFER to Section 419-10 . TEST the system for normal operation. B1352 Ignition Key-In-Ckt Failure LCM GO to Pinpoint Test C . B1359 Ignition Run/Acc Circuit Failure LCM REFER to Section 211-05 . B1462 Seat Belt SW_Ckt Failure LCM GO to Pinpoint Test B . B1485 Brake Pedal Input Circuit Short to Batt. LCM REFER to Section 417-01 . B1555 Ignition Run/Start Circuit Failure LCM REFER to Section 211-05 . B1569 High-Beam-Short to B+ LCM REFER to Section 417-01 . B1577 Park Lamp Input-Short to B+ LCM REFER to Section 417-01 . B1581 Panel Dim Increase Input Circuit Short to B+ LCM REFER to Section 413-00 . B1585 Dim Panel Decrease Input Circuit Short to B+ LCM REFER to Section 413-00 . B1676 Battery Voltage Out of Range LCM REFER to Section 414-00 . B1687 Dome Lamp Input Short to B+ LCM GO to Pinpoint Test D . B1689 Autolamp Delay Input Circuit Failure LCM REFER to Section 417-01 . B1691 Autolamp Delay Input Circuit Short to B+ LCM REFER to Section 417-01 . B1695 Autolamp ON/OFF Short to B+ LCM REFER to Section 417-01 . B1873 Turn Signal/Hazard Power Feed Short to Ground LCM REFER to Section 417-01 .

Aug 12, 2016 | 2000 Lincoln Town Car

1 Answer

The truck release does not respond to the key fob or the door release. Driver door lock does not respond to the fob or the number pad on the door.


The best place to start is take it an have it checked for DTC'S -diagnostic trouble codes ! Not with a code reader ,as these just read OBD2 codes .Not Body control module codes >
DDM Diagnostic Trouble Code (DTC) Index
DDM Diagnostic Trouble Code (DTC) Index DTC Description Source Action B1322 Driver Door Ajar Circuit Short to Ground DDM Go To Pinpoint Test N . B1352 Ignition Key in Circuit Failure DDM Go To Pinpoint Test H . B1396 Power Door Lock Circuit Short to Battery DDM Go To Pinpoint Test A . B1397 Power Door Unlock Circuit Short to Battery DDM Go To Pinpoint Test A . B1526 Keyless Entry Circuit Short to Ground DDM Go To Pinpoint Test E . B1553 Decklid Release Circuit Short to Battery DDM Go To Pinpoint Test B . B1751 Park/Neutral Switch Circuit Short to Battery DDM Go To Pinpoint Test K . B2425 Remote Keyless Entry Out of Synchronization DDM Go To Pinpoint Test L . LCM Diagnostic Trouble Code (DTC) Index DTC Description Source Action B1300 Power Door Lock Circuit Failure LCM Go To Pinpoint Test M . B1310 Power Door Unlock Circuit Failure LCM Go To Pinpoint Test M . B1319 Driver Door Ajar Circuit Failure LCM Go To Pinpoint Test N . B1322 Driver Door Ajar Circuit Short to Ground LCM Go To Pinpoint Test N . B1396 Power Door Lock Circuit Short to Battery LCM Go To Pinpoint Test M . B1397 Power Door Unlock Circuit Short to Battery LCM Go To Pinpoint Test M . B1677 Alarm Panic Input Circuit Failure LCM Go To Pinpoint Test O . B1679 Alarm Panic Input Circuit Short to Battery LCM Go To Pinpoint Test O . Visual Inspection Chart Mechanical Electrical
  • Binding latches
  • Battery junction box (BJB) fuses:
    • circuit breaker 7 (20A)
  • Central junction box (CJB)
    • 4 (10A)
    • 6 (15A)
    • 8 (25A)
    • 13 (5A)
  • Keyless entry keypad switch
  • Power door lock actuator
  • Luggage compartment release switch
  • Luggage compartment release solenoid
  • Connectors or connections
  • Wiring harness

Dec 30, 2015 | 2001 Ford Crown Victoria

2 Answers

Iwhere is the turn signal flasher located


  1. CAUTION: Prior to removal of module, it is necessary to upload module configuration information to a scan tool. This information needs to be downloaded into the new module once installed. For additional information; refer to Module Configuration. Ignore numbering on left of page


  2. There isn't a flasher...It is a module called the LCM ( Lighting Control module)...It needs to be replaced and requires a scan tool...Not a backyard project...




  3. Disconnect the battery ground cable.
  1. Remove the LH instrument panel lower insulator.
    1. Remove the pin-type retainers.
    1. Disconnect the courtesy lamp.
    1. Remove the LH instrument panel insulator.

iwhere-turn-signal-flasher-located-wtik1u3pjfqjepqdinj1lpkj-5-0.gif
  1. Position the LCM aside.
    1. Remove the screws.
    1. Release the locking tab.
    1. Position the LCM aside.

iwhere-turn-signal-flasher-located-wtik1u3pjfqjepqdinj1lpkj-5-2.gif
  1. Remove the LCM.
    1. Disconnect the electrical connectors.
    1. Remove the LCM.

iwhere-turn-signal-flasher-located-wtik1u3pjfqjepqdinj1lpkj-5-5.gif saailer

Jun 19, 2015 | 2000 Mercury Grand Marquis

1 Answer

Twilight sentinel will not work; now headlight and tail lights won't come on; interior lights still work with knob. Do you think it is the F-switch? Also, where can I get a schematic of how to ins


It's probably the lighting control module , but without doing some electrical testing that is just a guess !
Battery positive voltage (B+) is applied at all times to the lamp control module (LCM) through the underhood junction block HDLP MaxiFuse® and CKT 1242 (RED).
When you place the headlamp switch in the HEAD position, the headlamps input to the LCM is grounded. The LCM then applies battery positive voltage (B+) through the underhood junction block HDLOBML fuse and HDLOBMR fuse, which feed the left low beam headlamp and the right low beam headlamp respectively. When you activate the headlamp dimmer switch by pulling on the multifunction lever until the switch clicks, CKT 524 (PPL) is grounded to the LCM. The LCM then removes battery positive voltage (B+) from the low beam headlamps and supplies battery positive voltage (B+) through the underhood junction block HDHIBML fuse and HDHIBMR fuse, which feed the left high beam headlamp and the right high beam headlamp respectively.

Twilight Sentinel Circuit Description
Twilight sentinel determines whether the daytime running lamps (DRL), or the exterior lamps and the low beam headlamps at full intensity should be on based upon the signal of the ambient light sensor. When the ambient light sensor detects daytime, the twilight sentinel turns on the DRL. When the ambient light sensor detects darkness, the twilight sentinel turns on the exterior lamps and the low beam headlamps at full intensity. The twilight sentinel also keeps the lamps on for a delay period of 3 to 180 seconds under the following conditions:
• The vehicle is in PARK.
• The ambient light sensor detects darkness.
• The ignition switch is turned to the OFF position.
You may turn off the twilight sentinel manually. When it is dark and the gear selector is in PARK, pushing the twilight sentinel switch to OFF will turn off the headlamps and exterior lamps. Pushing the twilight sentinel switch to OFF again will turn on the headlamps and the exterior lamps. If the gear selector is not in PARK, pushing the twilight sentinel switch will have no effect.
The F- switch is just an input from the LCM - lamp control module .
Do you know how to test control module inputs an outputs ? Very easy to fry a module if you don't know how to do it .
Also have a full scan of all modules on the vehicle , could have DTC'S - diagnostic trouble codes stored . Not for the OBD 2 engine computer . The instrument cluster , BCM , LCM can all set codes too, related to lighting an someother thing's .
ECM Inputs and Outputs Diagnosis

Electric Testing Techniques You Need to Know

You can find free wiring diagrams here http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model and engine ! Under system click on lighting ,then under subsystem click headlamps . Click the search button then the blue link . The first diagram you will see at the top the power supply to the LCM , down a little you will see the headlamp switch , ambient light sensor . Now if you want to start replacing thing's without testing good luck !

Jun 02, 2017 | 1997 Buick Park Avenue

1 Answer

Lcm 2004 grand marquis


the lcm is just right of the steering wheel column and left of and below the radio. you have to remove a plastic cowling under the steering column that is attached by two plastic push pins on either side of the column. the cowling slides out and the lcm is exposed. it's a black box a bit bigger than the size of a brick and has three wire harnesses plugged into it. the lcm is held in a metal cage bracket with two hex head screws. After removing the screws, the lcm can be pushed up slightly and out of the cage toward the front of the fire wall. it's easier to detach the harnesses after the lcm is out of the cage.

Nov 26, 2011 | Cars & Trucks

6 Answers

2005 MERCURY GRAND MARQUIS GS LCM headlights


you can oder a cheap lcm from silverstatefordparts.com or sometimes u can just tap the lcm box and lights should turn back on.

May 14, 2010 | 2005 Mercury Grand Marquis

1 Answer

2004 crown vic interior lights stay on


Don't think you have a door ajar switch problem , more then like the lighting control module is the culprit . Does the door ajar light on the instrument cluster stay lit ?
The interior lighting can be separated into two distinct modes of operation: the courtesy lighting and the demand lighting. The lighting control module (LCM) controls all of the interior lighting in the vehicle, as described in the following text.
The front dome lamps, rear reading lamps, and instrument panel courtesy lamps, can be illuminated either by opening any of the vehicle doors (courtesy lamp function) or by depressing the headlamp switch (demand lamp function).
When any door is open, the door ajar switch grounds an input to the LCM which then sends power to the courtesy lamps. The voltage sent to the courtesy lamps gradually increases from 0 volts to 12 volts within 500 ms (± 50 ms), to achieve the theater lighting effect. When the door(s) are closed the door ajar switch(es) break(s) the ground to the LCM input which then gradually reduces the power from 12 volts to 0 volts within 5 seconds. (± .5 second).
When the headlamp switch is depressed it grounds an input to the LCM which in turn sends 12 volts to the front dome lamps, rear reading lamps, and instrument panel courtesy lamps. When the headlamp switch is depressed a second time, it breaks the ground to the LCM input which then ceases to send power to the front dome lamps, rear reading lamps, and instrument panel courtesy lamps.

The battery saver will disrupt power to the courtesy lamps after 10 minutes, the demand lamps after 30 minutes, and the headlamps after 10 minutes. Turning the ignition switch to the RUN or ACC position will terminate the battery saver feature by disabling the interrupt timers and reinstate power to the lamps.
Do you know what DTC'S are ? diagnostic trouble codes !
LCM Diagnostic Trouble Code (DTC) Index DTC Description Source Action B1322 Driver Door Ajar Circuit Short to Ground LCM Go To Pinpoint Test F . B1442 Door Handle Switch Circuit Failure LCM Go To Pinpoint Test G . B1445 Door Handle Switch Circuit Short to Ground LCM Go To Pinpoint Test G . B1563 Door Ajar Circuit Failure LCM Go To Pinpoint Test C . B1566 Door Ajar Circuit Short to Ground LCM Go To Pinpoint Test H . B1685 Lamp Dome Input Circuit Failure LCM Go To Pinpoint Test I . B1687 Lamp Dome Input Circuit Short to Battery LCM Go To Pinpoint Test I . - All Other DTCs LCM REFER to Section 419-10 .

PINPOINT TEST C: THE COURTESY LAMPS STAY ON CONTINUOUSLY CONDITIONS DETAILS/RESULTS/ACTIONS C1 CHECK THE SYSTEM OPERATION Open and close each door, making sure that each door is completely closed.
  • Are the courtesy lamps still illuminated after the 25 second time-out period?
Yes GO to C2 .

No The system is operating correctly. C2 TEST DOME LAMP SWITCH Depress the dome lamp switch.
  • Are the courtesy lamps still illuminated?
Yes DEPRESS the dome lamp switch a second time. GO to C3 .

No The system is operating correctly. C3 CHECK THE LIGHTING CONTROL MODULE
LCM C2145a

  • Are the courtesy lamps still illuminated?
Yes REPAIR circuit 53 (BK/LB). REPEAT the self-test. CLEAR the DTCs.

No INSTALL a new LCM. REFER to Section 419-10 . REPEAT the self-test. CLEAR the DTCs.

Apr 16, 2017 | 2004 Ford Crown Victoria

1 Answer

Headlights won't come on, now car won't start.


It is definitely the Lighting Control Module. Just fixed one for a friend. It has internal printed circuit board failure.
It is easy repair but it is expensive. New are 500. Controls much more than lights. Alarm, air bag, door key pad, etc.

You need to have correct part for 2003. tascafordparts,com has the for about $250.

It's just above brake pedal. remove the sond panel. The module will come out without removing other components.

Lighting Control Module (LCM)
The LCM eliminates the electronic interference and heat associated with the thermoelectric devices used previously. The LCM is a microprocessor- based module that controls several vehicle subsystems. It responds to electrical input signals from various switches, sensors, and external modules.
LCM exterior lighting subsystem functions include:
  • headlamps with autolamps (if equipped)
  • turn signal lamps/hazard flasher lamps
  • cornering lamps
  • parking lamps
  • battery saver
Principles of Operation
The lighting control module (LCM) is a microprocessor-based module that controls several vehicle subsystems. The LCM responds to electrical input signals from various switches, sensors, and external modules. The LCM is located under the LH side of the instrument panel. Subsystem functions of the LCM include headlamps with autolamps, turn signal lamps/hazard flasher lamps, cornering lamps, parking lamps, courtesy lamps, demand lamps, battery saver and control backlighting.
Module —Lighting Control (LCM) Removal and Installation

  1. Remove the LH instrument panel lower insulator.
    1. Remove the pin-type retainers.
    1. Disconnect the courtesy lamp.
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  1. Position the LCM aside.
    1. Remove the screws.
    1. Release the locking tab.
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  1. Disconnect the electrical connectors and remove the LCM.
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Apr 20, 2009 | 2003 Mercury Grand Marquis

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