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Questions & Answers
Power door locks on 1999 Mustang won't work
If you have a test light or voltmeter I'll try and walk you thru this.
How your system works is the switch has power to it from fuse 19 in the under dash fuse panel(15amp) on the WH/VT wire,this is the same on both switches.
when you go to the lock postion the drivers switch will get power on the VT wire and in the unlock postion it will get power on the LG wire. On the passenger switch in the lock postion it will get power on the PK/YEand in unlock on the PK/LG.
Now this will fed to the GEM module which piggy backs onto the fuse panel.Then the GEM will provide power and ground to the door lock actuators in the door.
Now if you have power leaving the switch like stated I would then remove one of the door panels to access one of the actuators. Then measure voltage and ground at the actuators while you activate the door lock switch.It should have power on one side and ground on the other in one postion then when you go to the other postion on the switch this should switch, previous wire that was hot should now be ground and previous ground should now be hot.
Make sure you test it for ground as well as power you can do this by hooking your test light to a power source instead of ground and when u get a ground of course it will light.
Now the test I just provided will eliminate the door lock switches and the door lock actuators. If you do not have the power and grounds as listed then the problem will be either wiring or GEM module.
on Sep 30, 2018
My driver's seat has broken in my 1999 Ford
Get it fixed or replaced NOW!! A loose seat is VERY dangerous!!!
For the amount of hassle this might cause replacement is your better option, but expensive. To fix this you will possibly have to strip the upholstery and padding from the entire seat.
You might be able to get a used set from a vehicle breakers yard or one of the Mustang owners clubs.
on Jan 25, 2018
99 ford mustang 6 cylinder. Recently i had to add
replace any soft hoses.
collapsed hoses cause water flow constriction
.that increases temp fast
to bleed air out of the system . if no air bleeder as such
with heater on full .-engine running
loosen the bypass pipe for the closed thermostat till only coolant flows no air bubbles
the engine cooling fan spinning fast enough
the water pump in good condition
the interior directional flaps motors or actuators working
on Apr 01, 2017
Mustang wiring diagrams
First check the light switch and brake switch. Under driver side is the rear light harness. Go to advance auto get a HAYES REPAIR MANUAL for mustang for that year I think they are all the same.
on Oct 15, 2015
1999 mustang base v6 noisy rear above 50 mph
check the "u" joints and check that the drive shaft flanges have been properly fitted to the pinion flange or that the "u"joints have been properly fitted into the pinion "ears " of the pinion.. Check that the correct grade of oil was used in the diff and it has the correct amount. New out of the factory diff should not be noisy but if you have a new rebuilt diff then it is possible that the gear mesh is not correct or used gears were used where the best mesh was obtained.
on Jun 07, 2014
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