Bypass four-wheel drive control module
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New User
Joined: Jan 2021
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Bypass four-wheel drive control module
I have a 2002 Excursion XLT Limited 4x4 with 7.3 diesel. I recently lost 4 wheel drive and was able to identify the 4 wheel drive control module (or GEM, or body control module) as the issue. I would like to bypass the module completely and just use some toggle switches to control the motor on the transfer case. Any help would be appreciated.
More Turbo
Joined: Dec 2006
Posts: 609
Likes: 3
From: Central Va
Exactly what I was thinking, same issue, same problem, I didn't dig into it yet, my only concern was ability to switch between high and low. I ordered a refurbed module off ebay and crossing my fingers. That hurt the wallet.
Fleet Mechanic
Joined: Jan 2017
Posts: 1,665
Likes: 180
In this for the fix. I've not seen anyone actually be able to do a mod like this because the shifter on the transmission is not an on/off switch for each gear. It's a resistor if I remember correctly (not 100%) on that. In any case, the vehicle needs to see certain things like transmission in park, neutral, or drive/reverse; speed; and whether or not the brake is pressed (for low range). I suppose one could just power the shift motor using hot and ground, but being that it has 3 positions in the transfer case, I'm not sure how you'd do that. Very interested to see how you do this, so post up LOTS of pics!!
Lead Driver
Joined: Apr 2011
Posts: 8,259
Likes: 346
From: Northern California
You could bypass the stock system but would need to build a system to control the shift motor, i would think a Raspberry PI based controller to be be the simplest way to go about doing it electronically.
or switch to a mechanical system by building a shifter.
or switch to a mechanical system by building a shifter.
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gcburkett
1997 - 2006 Expedition & Navigator
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Nov 12, 2015 10:23 PM
