Lincoln vs Cadillac Forums

(This is the forums archive - If you want to get back to the main site simply click the banner above and you will be taken to our homepage.)

Lincoln vs Cadillac Forums is the Ultimate Online Resource for Owners and Enthusiasts of American Luxury Cars. Feel free to browse through our archive - but make sure you make it back to our main site - Lincoln vs Cadillac Forums

Cadillac XLR : Cadillac CTS : Cadillac : 2005 Cadillac STS : Cadillac Forums : 2000 Lincoln LS : Lincoln Mark VIII : Lincoln Mark VII : Car Wax
Lincoln Town Car : Lincoln Air Suspension : Lincoln Continental : Lemon Law : Do It Yourself Car Repair : Lincoln vs Cadillac Forums : Mesothelioma

Back to the Archive Main Page

Pages: 1

Trunk lock problems

(Click here to view the original thread with full colors/images)

Posted by: suncoaster

My '85 Mark VII power trunk lock used to work flawlessly, but now it is giving me intermittent problems; sometimes it will latch but not power down (close) and sometimes the glove box release switch won't open the trunk. I'm afraid I'm going to get locked out of it soon and need an alternate way to open the trunk, preferably mechanical, as I don't use the keyless entry.
Could also use a wiring diagram of the trunk system if anybody has one and could post it here.

Posted by: OldSchool1

Quote:

Originally Posted by suncoaster

My '85 Mark VII power trunk lock used to work flawlessly, ...

Replace the entire unit with one from the junk yard or ebay.

Posted by: NYC LS8

Yeah, sounds like the pull down motor is shot-ski.

Posted by: OldSchool1

Quote:

Originally Posted by NYC LSC

Yeah, sounds like the pull down motor is shot-ski.

Word-ski.

Posted by: suncoaster

Thanks for replies; actually, I think the problem is in the wiring to the pull-down motor, as when this motor runs, it sounds fine. Right now, it's stopped in the pulled-down position, so I can close, lock and unlock the trunk with either the glove-box switch or the keyless entry code.
Wiring diagram would help a lot.

Posted by: OldSchool1

Quote:

Originally Posted by suncoaster

Thanks for replies; actually, I think the problem is in the wiring to the pull-down motor, as when this motor runs, it sounds fine. Right now, it's stopped in the pulled-down position, so I can close, lock and unlock the trunk with either the glove-box switch or the keyless entry code.
Wiring diagram would help a lot.

Remove it and test it with 12 volts or use a multimeter to verify voltages in.

The diagram you seek lies with the EVTM for your year.
See: http://www.faxonautolit.com/

Posted by: suncoaster

Many thanks, Oldschool1; that manual should be on the way. Looks like it's just what I need.

Posted by: mach8

had similar problems on my Mark VIII.

Was being caused by a broken wire in the harness where it came out of the side of the trunk liner and went up to the trunk lid. The wire broke from rubbing against the trunk liner.

Where the problem comes and goes I'd look for loose/bad connectors, broken/cut wires etc.

Posted by: OldSchool1

Quote:

Originally Posted by mach8

had similar problems on my Mark VIII.

Was being caused by a broken wire in the harness where it came out of the side of the trunk liner and went up to the trunk lid. The wire broke from rubbing against the trunk liner.

Where the problem comes and goes I'd look for loose/bad connectors, broken/cut wires etc.

Agreed.
What my EVTMs do is narrow down my problems by telling the way things are ~supposed~ to be. When I start trouble shooting a circut, I'm armed with the correct conditions making spotting the incorrect condition much more visible.

Shop manuals and EVTMs pay for themselves after the first or second use. Wait until Dude sees how many ground wires our Mark VIIs have

Posted by: OldSchool1

Quote:

Originally Posted by suncoaster

Many thanks, Oldschool1; that manual should be on the way. Looks like it's just what I need.

BTW, YW

Homeowner Loans:Loans:Homeowner Loans:Secured Loans:Loans