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Have a 2002 Xtra Cab with 4X4 and NO button. When I engage the lever I get NO light on the dash and the four wheel is NOT engaging. The trans is turning the front drive shaft but the wheels are NOT engaged. I think its the front Actuator. But can someone tell me what tells the actuator to engage? Since there is NO button???
 

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Mambeau / Admin
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(1) Welcome to CT!

(2) It could be the actuator, but it could also be a problem with the Transmission Control Relay.

If you don't have the 2WD / 4WD select switch (button) there's no 4WD ECU and engagement is controlled by a straightforward relay. The relay is on the passenger side behind the dash.

The exact wiring scheme varies depending on which transmission you have, ABS (or not), etc.

Here (attached) are the 2002 Relay Locations and 4WD (w/o 2–4 SELECT SW) wiring diagrams.
 

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