Heated Seats Relay
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Junior User
Joined: Jul 2008
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Heated Seats Relay
I know this isn't a diesel question but its driving crazy. My heated seats in my truck hav'nt worked since I bought it. Lights come on on the switch but no heat. I just discovered a relay under the drivers seat. It clicks when you turn the ignition on, but when you hit the button theres no click. I'm thinking it should click with the button, not sure though. Has anyone else had this problem or can anyone else check theres for me? I know the relay has something to do with the heated seats because when I remove it the lights on the switch dont work.
Lead Driver
Joined: Sep 2007
Posts: 8,180
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From: Scio, OR
What year is your truck? These are the wiring diagrams for a 2004. They are likely mostly the same for a 1999-2007. The fuse numbers might be different.
It appears from the diagram, that the seat heater relay activates when the key is turned on. The switches then direct power to each sides seat heaters. So, other than them not warming up, what you are describing appears to be normal.
You might check the connectors to make sure everything is making good contact. That is about the only suggestion I can come up with.
It appears from the diagram, that the seat heater relay activates when the key is turned on. The switches then direct power to each sides seat heaters. So, other than them not warming up, what you are describing appears to be normal.
You might check the connectors to make sure everything is making good contact. That is about the only suggestion I can come up with.
Senior User
Joined: Nov 2009
Posts: 171
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From: PA
Let me know what you find. I have a 2005 with the exact same thing going on. I can press the button and the light comes on, but no heat. Passenger side works fine. With winter coming up, this would be a nice thing to have.
I'll check my wires as well.
I'll check my wires as well.
Elder User
Joined: Jan 2007
Posts: 620
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From: Langley, BC, Canada
If anybody finds anything let me know. I have a 05 and the button on the drivers seat lights up but no heat. The passenger side seat works fine. I started to look at it one day but theres a lot of wires and plugs under the drivers seat so I stopped....but I would really like to get it working again.
Lead Driver
Joined: Sep 2007
Posts: 8,180
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From: Scio, OR
You all might want to check the continuity of the seat heater elements. I have no idea really but I could see where those elements might break after being moved around from people getting in and out over the years.
Lead Driver
Joined: Mar 2010
Posts: 5,505
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From: Woodbridge, Ontario, CA
Brilliant observation sir!!! Gentlemen, if you look closely at the wiring diagram, you will see that the seat heater grids are wired up in series, which means if any part of the circuit is open, the entire loop quits working completely. If I recall correctly, the seat heater grids are not a cheap item, which is why few bother to spend the money to repair.
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Elder User
Joined: Jan 2007
Posts: 620
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From: Langley, BC, Canada
Brilliant observation sir!!! Gentlemen, if you look closely at the wiring diagram, you will see that the seat heater grids are wired up in series, which means if any part of the circuit is open, the entire loop quits working completely. If I recall correctly, the seat heater grids are not a cheap item, which is why few bother to spend the money to repair.
I also priced out the heater grid. I figured if it was cheap iwould buy one and hope it solve the problem but if I remember correctly they were about $150 where I live.
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Lead Driver
Joined: Mar 2010
Posts: 5,505
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From: Woodbridge, Ontario, CA
That's actually not a bad price. I've priced out Lincoln Navigator ones at over $450 a piece if I recall correctly.
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Junior User
Joined: Jul 2008
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I have heard other guys talk about a broken heater element in the seat and I have tried to check before. I was a little scared to pull the leather off the seat at first. The last time I tried it I did notice a burn mark on the passenger side. The wire wasnt broken though, it just had a slight kink in it. I cut and resoldered the wires together. The seat works great now. I checked the drivers side and found the same thing further back in the seat. I'm sure lovin having the heat back on. So I geuss if the lights working on the button then you def have juice to the elements. I'm guessing my dogs nails might of broke the wires or maybe just wear and tear. The wires are very small (maybe 26awg) and are not easy to strip. I'm an electrician and I had a hard time not cutting the wire completely, although I didnt have the right size wire strippers either.
Elder User
Joined: Aug 2010
Posts: 685
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From: Ft. Worth, TX
I've got the same issue... driver's seat stopped working this year, but passenger works fine. The light comes on, but no heat. I don't even know how to begin taking the seat apart, so any pictures would be a big help!
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Junior User
Joined: Jul 2008
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Never took any photos, but if you go under the front of the seat you can pull a plastic flap down thats hooked around a piece of metal. From there just keep peeling it back, there are metal o rngs you can seperate and unhook with a pair of needlnose pliers. Its not all that difficult just a pain in the ***.
