02 Ford Explorer GM

02 Ford Explorer Electrical Issues

Q: I have been told that my GEM is bad. My alarm system will go off, inside lights flicker on, door ajar light comes on just prior to when all this takes place. Could this module be the cause and if so, where would it be located.

A: Yes it could be the General Electronic Module. This diagnosis would require the Ford scan tool, STAR tester or WDS, to pinpoint the body code (B-series) and to try to reset it first before replacing it. There is also programming involved. The Ford antitheft system software is sometimes, on some models, split up among different modules, Instrument Cluster Module, GEM, PCM and others. It gets complicated if you don’t have Ford OEM information procedures and the scan tool.

Jim O’Neill
Chino Autotech Inc.

The GEM module controls the interior lights you describe, but the alarm and keyless entry functions are controlled by the central security module. The GEM is located behind the glove box, and the security module behind a trim panel on the right side of the cargo area. The two modules work together, so further diagnosis might be necessary to determine exactly where the fault may be. You may also want to check out the ignition switch, as the GEM relies partly on input regarding the position of the ignition switch for proper operation…

Thomas Dayton
JS Auto Supply
Jamestown, N.Y.


Yes. It’s a common problem among most Fords. It is under the dash.

Matthew Vaughn

You May Also Like

Wheel Bearings and Geometry

The pre-load determines the exact location at which the roller balls will contact the inner and outer races.

Wheel-bearing pre-load and geometry are terms that don’t get used too often in practice. But in reality, every time we remove or install a wheel bearing, we affect both – whether we consciously think about it or not.

Many of us clocked countless hours cleaning and repacking tapered roller bearings, long before the Generation 1 press-in sealed wheel bearings first became popular in the late 1970s on front-wheel-drive cars. Even when we began to see sealed wheel bearings on the front, tapered roller bearings usually still were used in the rear, in the hub of a brake drum or rotor.

Mapping Out the Future of the Global Aftermarket

Distribution leaders discuss the value of being part of NEXUS Automotive International.

Seasonal Sales Opportunities

With each new season, we’re presented with different challenges and different sales opportunities.

Brake Rotors: Resurface Or Replace?

With any rotor problems, unless it makes economic sense to resurface, just replace them.

Making The Case For ADAS

As real-world testing of autonomous vehicles begins, the technology is encountering some pretty significant speed bumps.

Other Posts

MAHLE Motorsport Ford Modular Coyote PowerPak Piston Set

Ford modular engine builders now can indulge in their quest for more power.

Loaded Struts: What’s In A Name?

Loaded strut assemblies are known by many monikers, but they all offer a common advantage: ease of installation.

Selling Wiper Blades

Don’t wait until winter arrives to talk about the importance of replacing them.

Diagnosing Engine Misfires

Contrary to popular belief, the ignition system isn’t always the cause of an engine misfire.