Question about 2001 Ford F150 Styleside SuperCrew

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I want to know how to test the driver side heated seat switch and wiring.

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I want to know how to test the driver side heated - 4e180e5.jpg

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I would start with testing the seat elements to make sure they do not have an open in them

Driver's side, unplug the connector to the heated seat element and test with a meter set to ohms .
Yellow w/ light blue stripe wire to violet w/ light blue stripe.

The most common point for the element to be open is on the seat where your thighs are at. Usually close to the center, it will have a small black mark on the seat mat / element backing.

Start with the meter check of the elements to verify. Good element will have a resistance, bad will show an open or infinity on the meter ( display when set to ohms, and holding the probes apart ).

Posted on Oct 10, 2010


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Trying to find which fuse is for the heated seats on a 2004 ford explorer sports trak

Heated Seats
This system allows the electrical heating of the front seats on passenger demand.
The components of the system are:
  • the seat heating elements located in the seat cushion and backrest.
  • the heated seat control switch, located on the seat side trim panel.
  • temperature sensors located in the seat cushion heating elements.
  • heated seat relay.
Do both front seat heaters not work ? Do you know how to test electrical circuits with voltmeter ?
  • Key in ON position.
  • Press the heated seat switch on the driver and passenger seats.
  • Are both heated seat switch indicators illuminated?
If both indicators illuminate, Go To Pinpoint Test K . If only one indicator illuminates, GO to J5 .

  • Key in OFF position.
  • Disconnect: Heated Seat Relay C3250 (located under the driver seat).
  • Key in ON position.
  • Measure the voltage at heated seat relay C3250-86, circuit 1003 (GY/YE), harness side and ground; and between C3250-30, circuit 566 (DG), harness and ground.
  • Are the voltages greater than 10 volts?
GO to J3 .

REPAIR inoperative 1003 (GY/YE) or 566 (DG) circuit. TEST the system for normal operation. J3 CHECK HEATED SEAT RELAY GROUND CIRCUIT
  • Key in OFF position.
  • Measure the resistance between heated seat relay C3250-85, circuit 57 (BK), harness side and ground.
  • Is the resistance less than 5 ohms?
GO to J4 .

REPAIR circuit 57 (BK). TEST the system for normal operation. J4 CHECK THE HEATED SEAT RELAY
  • Install a fused jumper lead between heated seat relay 3250-30, circuit 566 (DG), harness side and heated seat relay C3250-87, circuit 1064 (YE/LB), harness side.
  • Do both heated seat indicators illuminate when pressed?
INSTALL a new heated seat relay. TEST the system for normal operation.

REPAIR circuit 1064 (YE/LB) to switches. TEST the system for normal operation. J5 CHECK INOPERATIVE HEATED SEAT SWITCH INPUT
  • Key in OFF position.
  • Disconnect: Heated Seat Switch C320 (Driver) or C321 (Passenger) for the inoperative heated seat.
  • Key in ON position.
  • Measure the voltage between heated seat switch C320-2 (driver) or C321-2 (passenger), circuit 1064 (YE/LB), harness side and ground .
  • Is the voltage greater than 10 volts?
GO to J6 .

REPAIR circuit 1064 (YE/LB). TEST system for normal operation. J6 CHECK CIRCUIT 57 (BK) FOR AN OPEN
  • Measure the resistance between heated seat switch C320-4 (driver) or C321-4 (passenger), circuit 57 (BK), harness side and ground.
  • Is the resistance less than 5 ohms?
INSTALL a new heated seat switch. TEST the system for normal operation.

REPAIR circuit 57 (BK). TEST the system for normal operation It's not that simple , being a fuse . It's probably the relay or the heating element .
Your best bet would be to take to a qualified repair shop .

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1 Answer

Gmc jimmy heated seat not working on one side only.

If your fuses are good, perhaps your heated seat switch is faulty. You can test the switch for connectivity using a meter to see if power is going through the switch when in the ON position. If the meter shows no power while in the ON position, replace the switch. If power is reaching the seat, then likely the heating element itself within the seat is the culprit.

Apr 01, 2014 | 2000 GMC Jimmy

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Saturn relay 2005 heated seat fix

I don't know the history of your problem but I notice the reference to the relay. Heated seats often have problems and it can be things other than the relay. Heated seats work very similar to an electric blanket and just the same they often simply burn most cases it is easy for a good tech with a simple multimeter to determine whether this has happened. The relay can be tested by verifying that it has constant power at one terminal possibly with the key on...if it has that then the fuse is good. this type of relay is usually supplied with a second power lead for relay control that is only powered with the key on. When the switch is depressed it usually will give you a ground at the relay which activates it and allows power to go through the heated seat element. All that is needed is a simple test light. Most relays have a nice diagram on the side to identify the terminals and what they are. A relay simply uses a low current circuit (switch side) to control a high current circuit ( load side). On the relay illustration it will show you a small coil which magnetizes when the switch sends current through it and pulls the switch for the load side closed. Most of the time the wires for the control side are much smaller than the load side. I hope this helps!

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Hi, I have a 2001 Mazda Millenia S. The light for my heated seats come on, but there is no heat in either the driver's or passenger's seat. What could be the problem?

Mazdas are pretyy bad about the seat heating elements burning out. To verify that the problem is not the circuits to the elements, remove the 4 bolts holding the seat to the floor and tilt the seat back. Find the 2 pn connector for the heating element under the seat. (On the driver's side it will have a White and Red wire and a Yellow and Red wire. On the passenger side it will have a White and Red wire and a Green wire) Disconnect the connector. Using a standard 12 volt test light and a paper clip, use the paper clip to connect on end of the test light to the White and Red wire and probe the Yellow and Red (or the Green wire) with the test light probing end. With the ignition switch on and the seat switches turned on, the test lamp should light up. If it does, you need to replace the heating element in the seat. If it does not light up, post a comment to let me know, and I'll talk you through diagnosing the heater circuits.

Mar 25, 2011 | 2001 Mazda Millenia

1 Answer

2005 hyundai tucson v6 passenger side heated seat will not warm up the light comes on. driver side is ok could it be the switch even if the light comes on

Possibly.... the only way I know to diagnosis this issue is with an amp meter in the circuit that heats the seats. Compare LH & RH seat heating current draw. If you find the pass seat is NOT drawing the same amount of current, further troublshooting is required. There are TWO heating elements installed in the seats -- seat bottom & seat back, and they are connected in 'SERIES'... so if either element goes/is 'OPEN', then it's component replacement time. There is a thermostat in the heating elements -- it regulates the seat temperature. One must isolate the two elements & check each one individually (seat bottom - checking resistance... and seat back - checking resistance). whichever one (or possibly both) are 'OPEN'. If you find resistance is normal (3 to 5 ohms), then the problem/cause may be in the switch (or its contacts). Using a test light (12 volt bulb), check for power (battery voltage) at the heating element connector to ground (chassis). If the bulb lights up, you know you have power at the switch and is sending it to the heating elements.

Nov 09, 2010 | Hyundai Tucson Cars & Trucks

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2000 lincoln LS V8 Driver side seat heater not working. Tested heating element in seat and that does work. What else is there to look at that is causing the problem. Thanks, Wayne

well if the heating element is good then you may have a bad switch, test the switch, also theres a heater module that goes bad located under driver seat ,so check that also. hope this helps,

Jan 30, 2010 | 2000 Lincoln LS

1 Answer


its more likely its a broken heating wire inside the seat, test the connector under the seat for voltage on the side going to the battery, and the one going to the seat for ohms, if power is present but the resistance is too high to be measured its a broken heating wire, only fixable by completely destroying the upholstery, but if no power is present its possible a fuse,wire or connection somewhere, usually the fuse block is on the driver side near the door (look for a panel that is either marked fuse, or easily pulled off) could be on the side of the dashboard,

Jan 19, 2010 | 2002 Chevrolet TrailBlazer

1 Answer

2006 Buick Terraza drivers heated seat not working passanger side ok wiring seems ok

you will need to check the fuses first and if they are okay. then take a test light and check the switch for the power seat itself and see if you are getting power to and from the switch. if all is okay check power at connector for heated seat and if all is okay the heat is bad or it maybe the switch i have seen both. good luck

Dec 26, 2009 | 2006 Buick Terraza

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Drivers side heated seat doesnt heat up...

I'd check to see if you're getting power to the switch first. If no, check fuse, if yes, test switch. You might get lucky on this one.

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I have the very same problem, no seat heat on either side and no power seat control on the drivers side. anyone know which fuse or switch operates the drivers side power seat? Thanks

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