Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
Hi there, I am Cam. Can I get your first name please?This sounds like the typical issue with the connection under the drivers seat. Let me explain.There is a large connector under your seat, at the back. IT has the connections for power, ground, the signals to and from the door for the heated seats and such in it. The power and ground terminals are too small and often start to overheat creating a poor connection. This results in intermittent operation of that connection and the seat functions. This is easy to identify, from the back seat, find the connector and disconnect it. Check on the condition of the terminals inside. Often you will find the 2 for the power and ground melted. There are a couple options for repair. First is to replace the connectors but then it may happen again. The easier option is to cut the wires for just the power and ground, then direct connect them with crimp connectors.
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The Service 4wd means there is a fault in the system. We would need the code as scanned from that system with a scan tool to see why, but it could be the module, switch, actuator on the front axle, or the shift motor or sensor on the transfer case.
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