Question about 1994 Chevrolet S-10 Blazer

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Four Wheel Drive switch lights at start up, but does not engage

The transaxle, and light does not come on when pushed. The fuse, actually CB is good, I'm thinking it may be the relay, but I can't find it.

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The four wheel drive indicator light switch/ shift cable housing should be mounted on the front drive axle. The cable actuator vacuum diaphragm, or the switch assembly could be bad. You might want to check those. I hope this helps.

Posted on Dec 07, 2008

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Sounds like you have a bad switch.

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The service Four wheel drive light is to alert the operator the system is not being read properly by the ECU.

If the ECU loses contact with or position of the Transfer case actuator motor the service light will come on. Same thing goes for the front diff actuator.

So it may be a bad switch, sensor, or an actual problem in the 4WD linkage. This is not a Oil Change light that you can ignore a few extra weeks - it indicates a problem that should be taken care of ASAP to avoid costlier problems down the road.
Thanks for using FixYa - a FixYa rating is appreciated!!

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Sounds like yoou have a short either in the switch pod or in the 4wd electrics. Check for pinched wires or bare wires grounding out at the front axle and at the transfer case.
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