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Username Post: Suburban heated seats stopped working.... where to start?        (Topic#21432)
Allen 
Senior Member
Posts: 209

Loc: southern Indiana
Reg: 11-28-01
02-05-02 06:07 AM - Post#141495    

Hi! I'm really starting to get spoiled by my '99 Sub K2500.... so much in fact that the heated seats are a nice little blessing on these cold mornings.

However, yesterday they stopped heating! Since I'm not used to such luxury and features, I need to learn about their systems now too. The first obvious place I looked to find out about them was in the owner's manual.

I've learned that there are actually TWO fuse boxes on the Suburban - one inside the dash, and one under the hood. I located a 20-amp fuse under the hood that claims to be for the heated seats and tested it. It appeared to be fine. But, I replaced it anyway.

Still no warmth........ where is the next obvious place to look in trouble-shooting this system. We are taking the Sub into Michigan this coming weekend, and I'd like to get them fixed as the wife is rather fond of them too. Thanks in advance for any suggestions!


------------------
Allen
1970 Nova SS 396/350 hp, 4-speed, 3.31 posi
=============
1999 GMC Suburban K2500, 3/4-ton, 454, 4x4,

Allen
1970 Nova SS 396/350 hp, 4-speed, 3.31 posi

1999 GMC Suburban K2500, 3/4-ton, 454, 4x4,
Gotta love those big blocks!


 
good.wrench 
Chevytalk Staff
Posts: 20079
good.wrench
Loc: new york,usa
Reg: 03-30-01
Re: Suburban heated seats stopped working.... where to start?
02-05-02 07:55 AM - Post#141496    
    In response to Allen

i have never seen or worked on heated seats but just like anything that draws heavy current i would look under the seats for a relay or control box,these things are never wired directly to the heating elements,there might be a circuit breaker in the main fuse box instead of a fuse which might be the factor too.get yourself a full size service mamual with schematics,that should tell you exactly where these things are.now be sure of what your looking at.the power seat motors have their relay control box under the seat.so look carefully.

good.wrench
moderator

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Allen 
Senior Member
Posts: 209

Loc: southern Indiana
Reg: 11-28-01
Re: Suburban heated seats stopped working.... where to start?
02-05-02 08:00 AM - Post#141497    
    In response to good.wrench

Thanks for your suggestions. Further investigation shows that only the driver's seat isn't working - the passenger seat is fine (my wife will be pleased).

My fuses are also good. I've heard that sometimes there have been issues with the heating elements breaking and failing.

Does anyone know how they are replaced/repaired?

Allen
1970 Nova SS 396/350 hp, 4-speed, 3.31 posi

1999 GMC Suburban K2500, 3/4-ton, 454, 4x4,
Gotta love those big blocks!


 
pest44 
Senior Member
Posts: 164

Loc: Knoxville, TN
Reg: 01-23-03
Re: Suburban heated seats stopped working.... where to start?
02-18-04 05:07 PM - Post#141498    
    In response to Allen

Just wanted to see if you ever resolved this issue. My father-in-law has a 99 suburb that the driver's seat stopped heating. He believes that it's the element, but can't get any two dealerships to quote the same part. How does the element come and any part numbers would be greatly appreciated.

 
DICKW 
Senior Member
Posts: 283

Loc: Boise, Idaho USA
Reg: 02-04-03
Re: Suburban heated seats stopped working.... where to start?
02-18-04 05:59 PM - Post#141499    
    In response to pest44

Must be a famous factory goof, I have a 2002 Olds Silhouette van and the drivers heated seat has never worked. The passengers seat works fine though.
Past owner of 1927,36,41,51,57,61,67,70,71,84,chevys. currently own a 1992 K2500HD Silverado EXT cab, 454CI,4L80E,with a Bank's Power Pack System.


 
Phazer 
Valued Contributor
Posts: 3004
Phazer
Loc: Armpit of the Universe
Reg: 10-10-03
Re: Suburban heated seats stopped working.... where to start?
02-18-04 06:21 PM - Post#141500    
    In response to Allen

The heating elements are about the diameter of one strand of 18 ga. wire. When you see one, you'd be suprised they last as long as they do. Anyway...in the past the only way to fix it was to replace the seat cover ($$$$$). I'm pretty sure they came out with just a replacment element. Bad thing is, there were two types if I remember right. One had to be sewn onto the cover but the other one was a peel and stick (one chance only on postioning). Also, if I remember right, there was a slew listed and the parts guy better have an option list of your truck while looking it up. There is also a module in the system (one each side?), but those very seldom ever fixed them. Might try swapping them. Little black box about 2" sqaure, 3/4" thick under the seats I think. Ooppss Just found this...Looks like a new cover. Document ID# 403046
1999 Chevrolet/Geo Chevy Suburban - 4WD

--------------------------------------------------------------------------------

Seat Cushion Heater Element Replacement - Front
Removal Procedure
On the Escalade, the heating element is taped to the seat cushion. On the base vehicles and the Denali, the heating element is sewn into the seat cover and not serviceable separately. On these vehicles, the cover must be replaced.

Remove the seat from the vehicle. Refer to Seat Replacement - Front Bucket .
Remove the seat cushion trim cover. Refer to Seat Cushion Trim Cover and Pad Replacement .



Remove the seat cushion heater.
Disconnect the seat cushion heater wiring harness.
Installation Procedure
Connect the cushion heater wiring harness.



Install the seat cushion heater.
Install the seat cushion trim cover. Refer to Seat Cushion Trim Cover and Pad Replacement .
Install the seat in the vehicle. Refer to Seat Replacement - Front Bucket .

--------------------------------------------------------------------------------
Document ID# 403046
1999 Chevrolet/Geo Chevy Suburban - 4WD
My "To Do List" for this weekend:
Nothing but womens names...
and drugs....

92 Bravada
96 Sunfire
00 Impala
05 Stratus
90 Wrangler
77 Cub Lo-boy
87 Intruder VS700
95 Intruder VS1400


 
Phazer 
Valued Contributor
Posts: 3004
Phazer
Loc: Armpit of the Universe
Reg: 10-10-03
Re: Suburban heated seats stopped working.... where to start?
02-18-04 06:37 PM - Post#141501    
    In response to Allen

Hope this helps....






Document ID# 341331
1999 Chevrolet/Geo Chevy Suburban - 4WD

--------------------------------------------------------------------------------

Heated Seats Circuit Description
Heated Seat System
The heated seat system incorporates a heated seat switch, heated seat module, seat temperature sensor, heating elements in the seat cushion (front and rear) and heating elements in the seat back (front only). All the passengers seats (front and rear) have a seat belt switch that is used for an enable signal when the seat belt is buckled.

Front Heated Seat Description
The front Heated Seat Switches receive power, with the Ignition in the Run position, from the RR HVAC fuse in the I/P Fuse Block through CKT 341 (BRN). When the switch is placed in the LOW position, the ON signal is sent to the Heated Seat Module through CKT 1503 (PNK/BLK), and the HIGH/LOW Signal is sent through CKT 1505 (LT BLU/BLK) to the heated seat module. The low side of the Heated Seat Switch has approximately 275ohms of resistance, while the high side has approximately 310ohms of resistance. The Heated Seat Module receives battery voltage from the FRONT HEATED SEATS fuse, in the underhood fuse block, through CKT 1840 (ORN). With the heated seat switch on, battery voltage is sent from the module through CKT 1462 (LT BLU) to the Seat Cushion Element. Output is sent through CKT 1985 (PPL) to the Seat Back Element. Since the elements are connected in series, ground for both elements is provided through CKT 150 (BLK) to ground G202. The temperature sensors for the seats are located with the seat cushion element. The sensor monitors seat temperature and a varying resistance that is monitored at the Signal Enable, cavity E of the Heated Seat Module. The Heated Seat Module compares this signal to the HI/LO input to determine when to apply and shut off battery voltage to the heating elements. Temperature settings are maintained around:

37.5°C (98.5°F) for the LOW position.
42.5°C (107.5°F) for the HIGH position.
Both the Driver's and Passenger's, heated seats operate the same. However, the Passenger's seat needs seat belt buckled. When the seat belt is not buckled, the enable signal through CKT 182 (YEL) is grounded at the heated seat module and the system will not operate.

Rear Heated Seat Description
The Rear Heated Seat Switches, like the front, receive power, with the Ignition in the Run position, from the RR HVAC fuse in the I/P Fuse Block through CKT 341 (BRN). These switches are mounted in the center floor console, giving access to the rear passengers. When the switch is in the LOW position, the ON signal is sent through CKT 901 (GRY), and the HIGH/LOW signal is sent through CKT 902 (PPL) to the Heated Seat Module. Resistance in the switch in the LOW position is approximately 200ohms and in the HIGH position is approximately 310ohms. Both rear heated seat modules receive constant power from the Heated Seats Rear fuse located in the Underhood Fuse-Relay Center through CKT 1940 (ORN). When the Heated Seat Module receives a signal from the Heated Seat Switch, CKT 1460 (PPL) (LR)/CKT 902 (PPL) (RR), the Module sends power to the LED, CKT 903 (DK GRN) (LR)/CKT 900 (DK GRN), located in the switch letting the passenger know that the heated seat control is on. The seat belt switch for both rear passenger seats operates the same as the front passengers. The belt must be buckled in order for the heated seat module to receive the ungrounded signal from the seat temperature sensor. When the module receives the signal it then compares the signal to the HI/LOW signal sent to the module from the heated seat switch through CKT 1464 (GRY) (LR)/CKT 901 (GRY) (RR) to determine the proper seat temperature setting.

The rear seats have the same temperature settings as the front. However, the rear seats only have seat cushion elements.


--------------------------------------------------------------------------------
Document ID# 341331
1999 Chevrolet/Geo Chevy Suburban - 4WD
My "To Do List" for this weekend:
Nothing but womens names...
and drugs....

92 Bravada
96 Sunfire
00 Impala
05 Stratus
90 Wrangler
77 Cub Lo-boy
87 Intruder VS700
95 Intruder VS1400


 
98Burb4x4 
Senior Member
Posts: 329

Loc: Southern California
Reg: 01-24-02
Re: Suburban heated seats stopped working.... where to start?
02-19-04 11:43 AM - Post#141502    
    In response to Phazer

Seen this a couple of times.Really start with good inspection of connector under seat.They are multi pronged with other prongs for seat adjustment and such.Make sure there is positive connection on all prongs.Some people store things under seat then when adjusting seat forward or backwards connector can catch and become partially or totally disconnected.Good Luck.

 
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