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Don 'Mo Lurch'
Don 'Mo Lurch', Mecury Mechanic
Category: Mercury
Satisfied Customers: 20901
Experience:  Ford Cert., Heavy Line Mech, Mobile Electronics. Sales, Installation & Repair for 30 years
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The power door locks don't work, neither does the trunk or

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The power door locks don't work, neither does the trunk or key pad or fob. Manually they work and with the key.
JA: Have you checked the fob's battery?
Customer: Yes, it's not the fob. The switch on the doors also don't work and the automatic locks at speed won't work either.
JA: What is the model/year of your Mercury?
Customer: 2008 Grand Marquis GS
JA: Are you fixing your Grand Marquis yourself? What have you tried so far?
Customer: Yes. I've checked the fuse (same fuse that operates the outside mirrors) I'm not sure of the circuit braker in the engine compartment.
JA: Anything else you want the mechanic to know before I connect you?
Customer: That's all I can think of.

Please test Voltage + on "both sides" of Fuses F2, F8 & F9 with Key ON
All located in the Inside Fuse Panel
Click Attachment Below

Please let me know what you find

Customer: replied 9 months ago.
Ok, I'm on my way to check the fuses


let me know what you find

Customer: replied 9 months ago.
I checked the fuses with the switch in the on position. Fuse #2 good 12 v on both sides, fuse # 9 good 12v both sides.
No fuse in location #9
Customer: replied 9 months ago.
I'm sorry it location #8 no fuse.

thank you for the update.........
IF ALL Fuses test god, then this is likely the Door Module, as the Door Module powers the Door Locks, Trunk, Key Pad, etc. thru data
You can Test for Voltage at the Door Module, but that does not prove the Door Module is bad
Use of Dealer Scan Tool is needed to Test & Program the Door Module
apprx 1 hour labor

Customer: replied 9 months ago.
I guess I'm going to have to take it to the dealership anyway. I guess I'll lock the doors the old fashion way by hand. Thank you.

the electronics on this vehicle is somewhat sophisticated to the point where Customer can only check Voltage, Connections & Ground.
The Modules that control a number of Components can only be tested via Dealer Scan Tool or equal, as DATA is used to power the different Components thru the use of Modules

Hope you get it fixed
Thank You


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Customer: replied 9 months ago.
I just noticed that when I press the lock and unlock button on the door I can hear a click in the panel could this mean anything.

the click you hear could be the Door Module & / or the Lock Actuator
You will need to remove Door Panel to have a look

Here is removal procedures

click attachment below

did you need more information?
please respond or rate my answer

thank you

Customer: replied 9 months ago.
I'm going to take a door panel off today to check on the DDM and the slight noise when I press the lock switch. Can I get in contact with you if need be on this order via text. Thank you

I will be on & off & very glad to respond when I see anything posted here......

most of us have other jobs, but keep track of customers throughout the day
let me know if you need further


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