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Peter Bagley
Peter Bagley, Toyota mastertech
Category: Mercury
Satisfied Customers: 811
Experience:  master tech at Toyota dealer
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I'M having a door lock issue with my 2003 grand marquis. the

Customer Question

I'M having a door lock issue with my 2003 grand marquis. the drivers side door lock does not work at all, unlock or lock. the passenger side works only to lock. I've replaced the lcm and the drivers side door actuator. still no change.
JA: Is this your first time dealing with this issue?
Customer: yes this is my personal car. i am a 25 year technician. it is very frustrating to deal with this issue. everything i see on identifix and the internet says actuators or ddm. this car has no ddm and no keyless entry.
JA: Are you fixing your Grand Marquis yourself? What have you tried so far?
Customer: lcm and drivers side door actuator
JA: Anything else you want the mechanic to know before I connect you?
Customer: no
Submitted: 12 months ago.
Category: Mercury
Expert:  Peter Bagley replied 12 months ago.

Hello and welcome to just answer and allowing me to assist you. I will need to ask you questions so we can work together and solve this problem. There is no magic to this we have to logically test and check items to isolate the problem. First thing you have to do is remove the driver's door pannel and test for voltage at the lock solenoid can you do that? if you need help let me know.

Customer: replied 12 months ago.
Already done that the actuator has power in both unlock and lock
Expert:  Peter Bagley replied 12 months ago.

then you need to supply a ground to the actuator on the opposite side to see if the actuator actually works