Question about 1998 GMC Jimmy

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No 4wd when i change switch on dash i have no 4wd

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Most common problem is located under battery tray. There is a vacuum supply coming from top of Trannie going to a plunger style actuator that pulles the cable to activate the front diff. Either check for vacuum and fix or I've relocated plunger to top of motor so I can clamp with vise grips to activate 4*4

Posted on Mar 19, 2014


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Apr 21, 2012 | Cars & Trucks

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Sep 21, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

4wd light on dash not working, changed switch on shift, bulb in dash and 4x4 computer control behind centre console. Also changed both switches in front axle but still no 4wd. Why?

Dear Fixya,

Solution at hand. I chased the harness to the gearbox. I methodically electrically earth tested each wire-to-switch and visually checked each wire for breaks whilst another kept turning on and off the 4wd switcth on shift. Eventually, at the rear end of the gearbox there is a multi connector of some several wires. One end had a female and the other exposed male pins. On counting the pins I noticed that one pin, on recollection green/red wire had been drawn back into the connector so not making a contact. I therefore, pushed the pin back through so to make a connection. All of the 4wd pneumatics, light on dash and front axles switches now work. That one wire caused total shutdown of the High 4wd system. I assume that during either off-roading or average road use an object, like a branch, fouled the rear connector and dislodged the wire connection.

Thanks for your quick response. Hope the above will help someone in the future.

Kindest regards,


Sep 11, 2009 | 1993 Toyota Pickup

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