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Replacing gem module on 99 f150

Tip on replacing gem module on 99 f150

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Posted on Jan 02, 2017

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  • 183 Answers

SOURCE: Gem Module, Fuse Box and Window Reseal

This 1997 Ford F150 needs the GEM module changed due to multiple conditions. To see testing that lead to this repair please click here. The GEM module is located t the rear of the interior fuse box.
dsc02823.jpg
The first step is to remove the trim panel that covers the gap between the upper side of the steering column and the dash. It just unsnaps from the dash. It makes it a little easier to remove if you move the shifter all the way down to drive 1.
dsc02824.jpg
With that out of the way the lower dash cover can now be removed. Most of the screws have 7 mm heads but there are two that have 8 mm heads.
dsc02825.jpg
Those two are at the lower edge of the fuse box.
dsc02826.jpg
One wiring harness needs to be disconnected from the panel.
dsc02827.jpg
Now the screws for the fuse box can be removed.
dsc02828.jpg
The wiring harnesses can be removed from the back of the fuse box. Two 10 mm headed bolts at the center of each connector.
dsc02829.jpg

Next remove the tube brace from around the bottom of the steering column. Four fasteners with 13 mm heads.
dsc02830.jpg

Now wiggle, pry and twist the fuse box and GEM module assembly down.
dsc02831.jpg
After the assembly is down far enough unplug the remaining harness connectors from the GEM module.
dsc02832.jpg
Almost there.
dsc02837.jpg
The assembly is now free of the vehicle.
dsc02833.jpg
The GEM module is held to the back of the fuse box by three phillips headed screws.
dsc02834.jpg
Easy to remove Now.
dsc02836.jpg
With the three screws removed the GEM unplugs from the back of the fuse box.
dsc02835.jpg
I put it all back together and checked my repair for power to the driver's power window switch.
dsc02842.jpg

Posted on Jan 10, 2012

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michigan man
  • 3533 Answers

SOURCE: GEM module replacement

try a salvage yard that has an expedition or an f150 pickup and take the parts off and install in yours disconnect the negative side of the battery and you shouldn't have to have it reprogrammed

Posted on Jan 25, 2009

sscullys
  • 984 Answers

SOURCE: how do you change the gem module in a ford f150

This is a PDF of the service manual from a 1997, same for the 1997-2003 MY F150s

Right click save as :
http://my.voyager.net/~sscully/1997F150GemRemovalandInstallation.pdf

Posted on Feb 11, 2011

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1 Answer

How do i replace the GEM


Cassidy, Links below to GEM.
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."

GEM Module Reprogramming Ford Truck Enthusiasts Forums

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What is an Engine Control Module ECU ECM Repair

Mar 03, 2016 | 2002 Ford Ranger

1 Answer

Gem module location


The fuse panel under the dash, and the GEM module are one in the same.

Aug 07, 2014 | 1999 Ford F150 Regular Cab

1 Answer

Ford Explorer wipers, power windows, doom lights won't work


Are u assuming the GEM module is at fault ? Did you or your local auto electrician check for DTC'S - diagnostic trouble codes?
GEM/CTM Wiggle Test Diagnostic Trouble Code (DTC) Index DTC Description DTC Caused By B1317 Battery Voltage HIGH GEM/CTM B1318 Battery Voltage Low GEM/CTM B1322 Driver Door Ajar Circuit Short to Ground GEM/CTM B1330 Passenger Door Ajar Short to Ground GEM/CTM B1352 Ignition Key-In Circuit Failure GEM/CTM B1410 Driver Power Window Motor Circuit Failure GEM B1438 Wiper Mode Select Switch Circuit Failure GEM/CTM B1441 Wiper Mode Select Switch Short to Ground GEM/CTM B1446 Wiper Park Sense Circuit Failure GEM/CTM B1450 Wiper/Wash Interval Delay Switch Input Circuit Failure GEM/CTM B1453 Wiper/Wash Interval Delay Switch Input Short to Ground GEM/CTM B1462 Seat Belt Switch Circuit Failure GEM/CTM B1577 Park Lamp Input Circuit Short to Battery GEM/CTM B1610 Illuminated Entry Input (From RAP Module) Circuit Short to Ground GEM/CTM
Did you an your auto electrican check power an grounds for the GEM ? Voltage drop testing ? . Did you check power an ground circuits for the affected systems . Working when they want sounds more like a loose connection somewhere .
ECM Inputs and Outputs Diagnosis
Symptom Chart
Symptom Chart Condition Possible Sources Action
  • The Wipers Are Inoperative
  • CJB Fuse 16 (30A).
  • Circuitry.
  • GEM/CTM.
  • Multi-function switch (13K359).
  • Wiper run/park relay.
  • Wiper HI/LO relay.
  • Wiper motor.
  • DTC B1431.
  • DTC B1432.
  • DTC B1438.
  • DTC B1450.
  • DTC B1840.
  • GO to Pinpoint Test A .

Plus looking at GEM scan data on a factory scan tool .Too many people miss diagnose these system's because they don't have a clue .

Jul 03, 2017 | 1999 Ford Explorer

1 Answer

Gem Module, Fuse Box and Window Reseal


This 1997 Ford F150 needs the GEM module changed due to multiple conditions. To see testing that lead to this repair please click here. The GEM module is located t the rear of the interior fuse box.
dsc02823.jpg
The first step is to remove the trim panel that covers the gap between the upper side of the steering column and the dash. It just unsnaps from the dash. It makes it a little easier to remove if you move the shifter all the way down to drive 1.
dsc02824.jpg
With that out of the way the lower dash cover can now be removed. Most of the screws have 7 mm heads but there are two that have 8 mm heads.
dsc02825.jpg
Those two are at the lower edge of the fuse box.
dsc02826.jpg
One wiring harness needs to be disconnected from the panel.
dsc02827.jpg
Now the screws for the fuse box can be removed.
dsc02828.jpg
The wiring harnesses can be removed from the back of the fuse box. Two 10 mm headed bolts at the center of each connector.
dsc02829.jpg

Next remove the tube brace from around the bottom of the steering column. Four fasteners with 13 mm heads.
dsc02830.jpg

Now wiggle, pry and twist the fuse box and GEM module assembly down.
dsc02831.jpg
After the assembly is down far enough unplug the remaining harness connectors from the GEM module.
dsc02832.jpg
Almost there.
dsc02837.jpg
The assembly is now free of the vehicle.
dsc02833.jpg
The GEM module is held to the back of the fuse box by three phillips headed screws.
dsc02834.jpg
Easy to remove Now.
dsc02836.jpg
With the three screws removed the GEM unplugs from the back of the fuse box.
dsc02835.jpg
I put it all back together and checked my repair for power to the driver's power window switch.
dsc02842.jpg

Jan 10, 2012 | 2000 Ford Expedition

2 Answers

My 99 f-150 's battery drains while sitting seems the ignition turns on by itself. what would cause that?


in left front of the cab under the dash is a GEM module, unplug and with a mirror inspect connector for corrosion, if there clean and lube with stabalaant 22 and replace the gem module and have winsheild resealed...
also raise each door sill plates and inspect for water accumulation there as well, corrodes the loom

Jan 20, 2010 | 1999 Ford F150 Regular Cab

1 Answer

1998 Ford F150. windshield wipers,interior light,and warning alarm system not working.Fuse and relays are good.


check to see if you have corrosion in the fuse box or the GEM module, by removing the fuse box completely, disconnect the battery, take out the two screws and two 8mm bolts that hold the fuse box in, it will take some maneuvering to get it positioned right to disconnect the two wiring harnesses from the fuse box, they are bolted through the middle. Once removed, take the GEM module off the back of the fuse box and look for what would be something like the same corrosion you would see on your battery posts, usually one of these components is corroded and causing the problem, my buddy got a replacement fuse box for his from a wrecking yard for only 15 dollars, with all the fuses and relays. If you have this corrosion, then you probably have a windshield leak at the lower left hand corner of the windshield, it lets water drip onto the fuse box and GEM module. Hope this helps, let me know

Nov 03, 2009 | 1998 Ford F150 Regular Cab

1 Answer

GEM module replacement


try a salvage yard that has an expedition or an f150 pickup and take the parts off and install in yours disconnect the negative side of the battery and you shouldn't have to have it reprogrammed

Jan 21, 2009 | 2000 Ford Expedition

1 Answer

Gearshift locked, no power windows, interior lights, wipers


For starters, do you have brake lamps? The shift lockout is controlled by the brake switch. As far as the others, yes it could be the GEM (generic electronic module) some of these vehicles have water intrusion problems that leat into the fusebox and GEM which is located on the back of the fuse box. If you can look at the fuse box inside the vehicle and if you can see the back, look for corrosion which is a sign of water.

Jan 17, 2009 | 2001 Ford F150 Styleside SuperCrew

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