Question about 2002 Ford F150 Regular Cab

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I have a 2002 FORD F-150 that water has leaked into the GEM and fusebox. How do I replace these?

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  • yadayada
    yadayada May 11, 2010

    Just start pulling screw until they come out, this is a pain in the as... to replace, esp the gem.



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Disconnect Battery, remove lower dash knee bolster. From under dash, you'll need to disconnect the 2 bulk connectors on top of the fuse box. (10mm bolt heads) From dash remove the bolts holding the box. Once you have the box free lower it until you can get to the connectors on the GEM module. disconnect connectors. Now box can be removed. It's tight, but it'll come out. The rest is pretty easy. Good Luck and please leave rating. Thanks

Posted on Jan 05, 2009

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My 01 had the same problem, dash lights went crazy, when dried out with a portable heater worked ok from then on, had to replace windshield to stop leak.

Posted on Apr 26, 2009


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Posted on Jan 02, 2017

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SOURCE: Replace Passenger Side Mirror on 2002 Ford F-150

On the inside trim, you can remove screws that are by the door handle, arm rest, under door and side of door and then gently pull back on the panel as there will also be retaining clips attached and you don't want to break them. You'll need to lift the door panel upwards in order to get it off the window ledge. Then you'll need to manipulate the panel and disconnect the door handle linkage from the door handle and disconnect the wiring for your controls. Then you can access the bolts that secure the mirror onto the door

Posted on Sep 29, 2009

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SOURCE: water leak from timing chain cover

Remove the water pump and harmonic balancer (use a balancer Puller). Remove the remaining bolts from the timing cover and the front four bolts from the oil pan. Remove the timing cover. Clean the old gasket from the block and cover . Reassemble. You may want to replace the pump as a maintainance item while it is removed.

Posted on Mar 29, 2010

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My 1998 F 150 4.6 4*4 auto Problem Lites and air fan can randomly come on spontaneously when the truck is shut off and consequently kills the battery. It seems to be more prevalent in wet weather or in...

The symptoms sound similar to the Soaked GEM issue that some F-150s had. The usual cause is the Windshield on the driver's side leaks, and allows water to get into the cab, soaking the GEM ( Generic Electronic Module ) which is mounted to the back of the CJB ( aka Central Junction Box / Cab fuse panel ). The other source of the leak has been linked to the power sun roof, where the drains a re blocked, and the water comes inside the cab down the A pillar )

1st thing is to have the windshield pulled and resealed, you might want to think about replacing it, if it is bad enough. This is to stop the water coming into the cab of the truck.

Next is to dry out the cab of the truck, to see if the symptoms go away. I have seen this be done via running the truck with the AC on, and the temp high ( heat with the humidity control of the AC ) or a space heater on the driver's side floor board in a garage to dry out behind the dash.

I would say drying out the truck cures the issues long term ~ 60% of the time ( after fixing the windshield ). If the leak has happened for too long, the GEM to CJB connectors might have corrosion on them, or the GEM damaged, causing the CJB to be removed and the connections cleaned and / or the GEM replaced.

There are 5 GEM versions for your MY, so if you get one from a bone yard, make sure it is the same ESOF 4x4, do not use a MSOF ( Manual Shift On the Fly ) 4x4 GEM, they are not interchangeable.

1997 Service Manual GEM removal directions in PDF ( Right Click Save As )

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1 Answer

My battery dies with the engine off in my 2001 F-150. At one point the fan that blows into the cab would run with the engine off. What could be the problem?

This sounds like an issue some 97-03 MY F-150s have, where a windshield ( or roof panel ) leak down into the area by the Cab fuse panel, and soak the GEM ( Generic Electronic Module ), causing all sorts of strange problems.

Depending on how long this has been happening, resealing ( or replacing if bad enough ) the windshield is in order, and dry out of the dash area with a small space heater can cure the issue.

If this has been happening too long the GEM to Cab fuse panel ( it is bolted to the back of the cab fuse panel ) connector pins can be discolored / corroded and the fuse panel / GEM needs to be removed and the pins cleaned ( hard to do on the female connector ).

Here is the manual section on GEM removal for the 1997, the process is very similar on the '02 MY F-150

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1 Answer

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1 of 2 places.
1. The windshield on the driver's side towards the lower corner. This is the more common location, and causes water to run down the a-pillar, and drip on the cab fuse panel / GEM

2. The less common location, power roof panel. Some times this will have an issue and water will run down the a pillar, similar to the leaking windhsield.

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1 Answer

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check for water intrusion on left side of dash. just above the fuse panel (or on backside) if this is so..the GEM module may have been damaged...for short term to drive the truck...turn the key to the on position without starting truck...shift into neutral, then start the can now drive the vehicle until fixed...hope this helps!

May 28, 2009 | 2002 Ford F150 Regular Cab

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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.

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1 Answer

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There is a module that mounts piggyback on top of the interior fuse box. It is called the GEM module. There has been problems with water entry into the GEM/interior fuse box causing them to short out. Look for signs of water. (Rust stains on the dash brackets) Disconnect the 2 bulk connectors from the fuse box and use a mirror to look into the fuse box to see if the terminals are corroded. Sometimes you won't see anything, but the water has been there and done it's dirty deed. Replace both pieces at the same time to avoid a headache down the road. Also fix the water leak. I usaully will put a piece of plasic over the top of these components when I'm finished just in case there is another leak. Good Luck

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ha it sound like the stearing colem need to be reaplaced.i do not think your gem module is bad.the controls for the whiper are in the stearing columen. i would get the parts out of a junk yard it will be cheaper.if you cant fix it get rid of it or it will cost you a lot of money.

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    Dont really understand the question but from what I can see the GEM is involved. On this model it usually has to do with a windshield water leak allowing water to intrude into the GEM. Push up on the upper left hand side of the windshield and se if it moves. If it does the glass must be replaced to properly repair the leak. Then and only then do you replace the GEM and possibly the fuse box due to water damage.

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