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MPMoore
MPMoore, GM WORLD CLASS/ASE MASTER W/L1 GMC
Category: GM
Satisfied Customers: 2956
Experience:  15 YEARS AS GM TECH, TEAM LEADER/SHOP FOREMAN AT A GMC DEALERSHIP
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I have a 2004 Envoy. The seat heaters will not stay on.

Resolved Question:

I have a 2004 Envoy. The seat heaters will not stay on. In other words, pushing the button the light comes on then goes off just as fast
Submitted: 5 years ago.
Category: GM
Expert:  MPMoore replied 5 years ago.

Dose the passengers seat do this as well?

 

 

Customer: replied 5 years ago.
Yes both seats act the same way.
Expert:  MPMoore replied 5 years ago.
The most common problem for this concern is the seat heater elements. The elements are inside the seat cushions and produce the heat. The elements can short out or burn out and when this happens, the seat module will not let power go to them. This is why the light turns on and then turns off right away. Both seats are controlled separate from each other but likely have the same problem. You can test the heater elements with a ohm meter but you have to remove the seats to get to the wiring for the elements. Under the seat there will be 2 small electrical connectors. The connectors are black and will have 2 wires. Disconnect the connectors and test the wires going to the seat cushions, test resistance across the 2 wires. The meter should read about 5 ohms, if it reads more then the element has a open, if its less then the element is shorted. The wires at the connectors should be RED/WHITE and GREEN. IF the elements test bad, you will have to remove the seat covers to replace them.
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