Push-button 4wd not working!

smash9002 · Mar 30, 2008

Ok so I need some advice, I cannot get my push-button 4wd to work in my 89 B2. It was working, but in some brilliant stroke of genius I threw away the controller and wiring harness, thinking it was for the abs. Today I pulled the harness and controller from my '90 b2 parts truck, which shifted fine 6 months ago, hooked everything up, and no 4wd... Checked my under-dash fuses, even tried disconnecting and re-connecting the battery. nothing... any ideas? im thinking the controller may be bad, anyone have one layin around? Please help!

mkpecor · Mar 30, 2008

its most likely the t-case motor, if you cant here it click when u hit the button then its bad, the tech section tells you how to take it apart and clean it. mine went out so i got a new one from lmc truck, havent had no probs with it since and i wheel every weekend.

Ranger44 · Mar 30, 2008

Try this, courtesy of 4x4 Junkie:

If all the fuses are good, the next step is to run the 4x4 module self diagnostic. The 4x4 module is located behind the driver’s side rear jump seat on super-cab models, but as far as the other locations I don’t really know. This module will have three connectors going to it – one will be a pig tail, the other two will be located on the right side of it (side towards the front of the truck). These two connectors must be removed to diagnose the module. With the key in the off position, remove these two connectors from the module. Next, turn the key on with the engine off. On top of the module is a white rectangular button located next to a red LED….push the button and watch the LED.
a. If it flashes, this indicates the module is working properly. Go to the next step

Then we'll look at the shift motor, you can easily, and for almost free, fix a shift motor.

mkpecor · Mar 30, 2008

mine is in the dash next to the pasenger speaker, take 4 scrouse out lift the plate cover and its right there.

smash9002 · Mar 30, 2008

Thanks guys, I went to the help section for transfer cases and figured out the under-hood fuse was bad, I had no idea it was even there! Thanks anyways!

mkpecor · Mar 30, 2008

yep, no problem.

Push-button 4wd not working!

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