Question about 1996 GMC Jimmy

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4wd will not engage, or engages intermittently. You can hear the click of a switch under or near the battery, but doesn't always engage.

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The main parts to the 4WD system are the transfer case, the shift control motor, and the shift control module. if you remove the shift control motor from the transfer case, and leave it plugged into the harness, you should be able to see if it functions thru all settings, such as 4wd high or low or 2wd. If not, then you need to figure out which part is bad, the motor or the control module. If it does work as it should, then you have some sort of transfer case problem.

Posted on Dec 10, 2009


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There is a vacuum line that goes to the transfer case.if this line is ruptured it will not engage the 4wd.Next there is a switch on the t-case that may not be working.In 4wd it supllies vacuum to the 4wd actuator that is under the battery the applied vacuum pulls the cable engaging the frontaxle.

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I have a 1998 chevy blazer and the 4x4 well not engage. I replaced the push switch on the dash and I can hear it click on the floorboard. help please

If you hear the click in the floorboard then the problem is either the vacuum switch on the top of the transfer case, the vacuum actuator under the battery tray or the cable from the actuator to the front differential lockout. Changing all three will cost less than a hundred bucks if you shop around for the parts. The vacuum switch is the part where the three hose bundle attaches on top of the transfer case. The actuator will pull the cable when engaged, you will feel it pull when you engage the 4wd. It will move slowly. The other thing to check is the vacuum hoses between the source on the back of the motor, the hose from the switch to the actuator and the vent attached to the trans dipstick. If the vent is clogged it won't engage or disengage. Good luck

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4wd not engaging 4wh flashing green light 4wl nothing at all hear click but not engaging

the 4wd acuator is stuck the clicking you hear inside the car is the relay sending power to it if you have acces to a lift somtimes if you tap on the acuator it will engage the motor if you havent used it in a while

Feb 24, 2010 | 2004 Toyota Tundra

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