How to service the Light Control Module on Mercury Grand Marquis?

When servicing the Lighting Control Module (LCM), configure the module then upload it to a diagnostic tool; otherwise, it will not be removed. Disconnect the battery, take out retainers, and the LH instrument panel lower insulator. Take out the accelerator pedal and then the LCM. Once the new module has been installed, download the configuration and undo the steps of removal.

How to service and repair the Light Control Module on Mercury Grand Marquis?

In order to replace the Lighting Control Module (LCM), unplug the battery ground, pull out the insulator of the left instrument panel, disconnect the accelerator pedal (where it is present). Disassemble the LCM and unscrew it and unscrew the connectors. Recheck the steps to install the new module and verify that it is working correctly.

OEM Mercury Grand Marquis Light Control Module

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7 Light Control Modules found

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Mercury Grand Marquis Lighting Control Module Part Number: 5W7Z-13C788-AD
$368.33 MSRP: $630.00
You Save: $261.67 (42%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Processor - Lighting Control
- Replaces: 5W7Z-13C788-AC, LCM-2, 5W7Z-13C788-AA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2005 Mercury Grand Marquis | GS, GSL, Limited Edition, LS, Ultimate Edition | 8 Cyl 4.6 L GAS
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Mercury Grand Marquis Lighting Control Module Part Number: 4W7Z-13C788-BD
$367.37 MSRP: $610.00
You Save: $242.63 (40%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Processor - Lighting Control
- Replaces: 4W7Z-13C788-BB, 4W7Z-13C788-BC, LCM-1
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2003-2004 Mercury Grand Marquis | GS, LS, LSE | 8 Cyl 4.6 L GAS
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Mercury Grand Marquis Lighting Control Module Part Number: XW7Z-13C788-BA
Product Specifications
- Other Name: Processor - Lighting; Module - Lighting Control
- Replaces: F8AZ-13C788-BA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1998-2000 Mercury Grand Marquis | GS, LS | 8 Cyl 4.6 L GAS
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Mercury Grand Marquis Lighting Control Module Part Number: 1W7Z-13C788-BC
Product Specifications
- Other Name: Processor - Lighting Control
- Replaces: 1W7Z-13C788-BB
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2001-2002 Mercury Grand Marquis | GS, LS | 8 Cyl 4.6 L GAS
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Mercury Grand Marquis Lighting Control Module Part Number: FW1Z-13C788-ARM
$110.86 MSRP: $174.36
You Save: $63.50 (37%)
Product Specifications
- Other Name: Remanufactured Processor - Lighting Control
- Replaces: 6W1Z-13C788-BA, 7W1Z-13C788-A, LCM-3
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2006-2007 Mercury Grand Marquis | GS, LS | 8 Cyl 4.6 L FLEX, 8 Cyl 4.6 L GAS
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Mercury Grand Marquis Lighting Control Module Part Number: F6AZ-13C788-AE
Product Specifications
- Other Name: Control Unit
- Manufacturer Note: Incl.police vehicle
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1995-1997 Mercury Grand Marquis | GS, LS | 8 Cyl 4.6 L GAS
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Mercury Grand Marquis Lighting Control Module Part Number: 8W7Z-13C788-C
Product Specifications
- Other Name: Processor - Lighting Control; Module - Lighting Control
- Manufacturer Note: Service Kit
- Replaces: 8W7Z-13C788-A, 8W7Z-13C788-B
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2008-2011 Mercury Grand Marquis | GS, LS | 8 Cyl 4.6 L FLEX, 8 Cyl 4.6 L GAS

Mercury Grand Marquis Light Control Module

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Mercury Grand Marquis Light Control Module Parts and Q&A

Lighting Control Module
FW1Z-13C788-ARM
Q: How to service the Light Control Module on Mercury Grand Marquis?
A: When servicing the Lighting Control Module (LCM), configure the module then upload it to a diagnostic tool; otherwise, it will not be removed. Disconnect the battery, take out retainers, and the LH instrument panel lower insulator. Take out the accelerator pedal and then the LCM. Once the new module has been installed, download the configuration and undo the steps of removal.
Lighting Control Module
5W7Z-13C788-AD
Q: How to service and repair the Light Control Module on Mercury Grand Marquis?
A: In order to replace the Lighting Control Module (LCM), unplug the battery ground, pull out the insulator of the left instrument panel, disconnect the accelerator pedal (where it is present). Disassemble the LCM and unscrew it and unscrew the connectors. Recheck the steps to install the new module and verify that it is working correctly.