I purchased my 2001 F150 King Ranch about 5 months ago. I inspected it from top to bottom before making the deal. My seat heater DID work at that time. We have had a little cold snap here in Texas a few mornings now, and my driver's side seat heater has decided not to work. Hasn't since. Very disappointing. Does anyone have any suggestions to where I would start to troubleshoot this problem? Any insight would be much appreciated.

 

Hi Shawn, don't know if you have your heated seat problem fixed. If not here is a start. I checked the wiring manual and the simplest two items to check are.

1. Battery Distribution box which contains fuses and relays, located under the hood, driver's side, near the brake master cylinder, under a black cover. The supply to the heater module is protected by maxi fuse no. 118 which is a 30 amp fuse.

2. Central Junction Box, located inside the cab, driver's side, behind the removable panel right next to the door. Fuse no 23, 10 amps. I would start with suggestion no. 1 as fuse no 23 in the CJB also protects other circuits such as Overhead Console, 4 wheel anti loc brakes, shift on the fly, and a couple others. i'm sure you would have missed them as well if this fuse was blown.

these are also other possibilities....

3. Other suggestion are to make sure the connectors associated with the heater circuits are making good connections. If 1 and 2 don't fix it you might want to try and replug the connectors around the seat.

You did not mention if the passenger seat was working or not. Both heaters are protected by the same fuse(s). So, if the passenger works look for a loose connector, or it could be a defective switch , heater control module, or heather element / thermostat problem.

Cheers and have a great day

moe

 

The passenger seat heater does work so I'll try what you suggested. I'll let you know.

Thanks!

 

this same thing happened to me, and what I did was check the voltage for each wire going into the motorolla heated seat module, which is secured right underneath the front of the seat, and compare these with the passenger side, since I knew it worked. then I checked th two harness that feed to the actual seat heating elements, one is a four wire connector, the other a two wire connector, both under the seat... if you find any inconsistancies, let me know which wires they are, and if possible maybe take some pics b/c the wire colors are probably different since mine isn't a king ranch.

ohh yeah, mine eneded up being that someone(probabaly one of my drunk friends back there) had pulled or kicked on the wires feeding the lumbar heater and they had disconnected, which caused the whole damn system to not work...

 

OK, here are my findings...

Fuses were all intact.

The junction box (10 pin) that connects to the black box had 9 wires in it. the plug itself was numbered. 1. brn/grn stripe 2. red 3. yellow 4. red/blk stripe 5. purple 6. white/blue stripe 7. blk/blue stripe 8. black 9. (no wire) 10. orange.

Passenger side in volts (working side)
1. 5.5
2. 0.5
3. 11.4
4. 11.6
5. 0.5
6. 11.8
7. 3.5
8. 0.4
9. 0
10. 1.9

Drivers side in volts (non-working side)
1. 0.2
2. 0.4
3. 11.9
4. 11.9
5. 0.2
6. 11.8
7. 3.9
8. 0.2
9. 0
10. 1.6

As you can see they all are similar.

The two pin connectors as compared.
1. purple 2. gray

Pass side: 1. 0.5 v 2. 5.4 v
Driver side: 1. 0.3 v 2. 11.6 v

The four pin connectors as compared.
1. gray 2. brown 3. black 4. yellow

Pass side: 1. 5.4 v 2. 0.5 v 3. 3.6 v 4. 11.4 v
Drivers side: 1. 11.4 v 2. 0.3 v 3. 4.1 v 4. 11.6 v

The only variants are the #1 pin on the 4-pin connectors.

Upon further investigation of the plugs, I got brave and pulled the seat cover off the drivers side top portion. (this may lay where the problem is) I found the pad that is glued to the foam had two wires that the soldering had come undone. Do you think that this would cause the whole drivers seat to malfunction?

Meanwhile I will run down and get a soldering gun and fix this problem. Thanks for the diagnostic help, and any further expertise!

 

Soldering the wires seems to have fixed the problem. Seat works fine now! Thanks for all of your help.

 

I have 2001 F150 4x4 King Ranch can anybody help

 

Driver seat captain chair in wifes truck isn't working
(Yeah, thats right, my wife's seat ain't hot anymore)

Getting power to the seat, checked with meter, need to pull off leather covers to find issue

Is there a consensus out there as to whether the problems are more in the seat backs or the seat bottoms?